QT20.241-C1,PDF,QT20.241-C1 PDF资料,Datasheet,下载QT20.241-C1技术资料

QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

POWER SUPPLY

3AC 380-480V Wide-range Input

Also Specified for 2-Phase Operation

Extra Long Lifetime

95% Full Load and Excellent Partial Load Efficiencies

Width only 65mm, Weight only 870g

50% BonusPower^®, 720W for up to 4s

Active Power Factor Correction PFC

Active Filtering of Input Transients

Full Power Between -25°C and +60°C

Extremely Low Input Inrush Current Surge

DC-OK Relay Contact

Quick-connect Spring-clamp Terminals

3 Year Warranty

GENERAL DESCRIPTION

SHORT-FORM DATA

The most outstanding features of the DIMENSION Q-

Series DIN-rail power supplies are the extremely high

efficiencies and the compact sizes which are achieved by

a synchronous rectification and other unique design

details.

Output voltage

Adjustment range

Output current

DC 24V

24 - 28V

20 – 17.5A

30 – 26A

nominal

continuous

short term (4s)

continuous

short term (4s)

20Hz to 20MHz

15%

Output power

480W

Large power reserves of 150% support the starting of

heavy loads such as DC-motors or capacitive loads. In

many cases this allows the use of a unit from a lower

wattage class which saves space and money.

720W

Output ripple

Input voltage

Mains frequency

AC Input current

Power factor

AC Inrush current

Efficiency

< 100mVpp

3AC 380-480V

50-60Hz

0.79 / 0.65A

0.94 / 0.95

typ. 3A peak

95.0 / 94.8%

25.3 / 26.4W

6%

High immunity to transients and power surges as well as

low electromagnetic emission makes usage in nearly

every environment possible.

at 3x400 / 480Vac

The integrated output power manager and virtually no

input inrush current make installation and usage simple

with no jumper and switches necessary. Diagnostics are

easy due to the DC-ok relay, a green DC-OK LED and the

red overload LED.

at 3x400 / 480Vac

operational

Losses

Temperature range -25°C to +70°C

Derating

12W/°C

+60 to +70°C

Hold-up time

Dimensions

Weight

typ. 22 / 22ms

65x124x127mm WxHxD

870g / 1.92lb

at 3x400 / 480Vac

Unique quick-connect spring-clamp terminals allow a

safe and fast installation and a large international

approval package for a variety of applications makes

this unit suitable for nearly every application.

ORDER NUMBERS

MARKINGS

Power Supply QT20.241

24-28V Standard unit

QT20.241-C1 24-28V Unit with conformal

IND. CONT. EQ.

coated pc board

UL 60950-1

Class I Div 2

UL 508

Accessory

ZM1.WALL

ZM14.SIDE

UF20.241

YR40.241

Wall mount bracket

Side mount bracket

Buffer unit

Redundancy module

EMC, LVD

Marine

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

1/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

INDEX

Page

1. Intended Use .......................................................3

2. Installation Requirements...................................3

3. AC-Input...............................................................4

4. Input Inrush Current ...........................................5

5. DC-Input...............................................................5

6. Output .................................................................6

7. Hold-up Time.......................................................8

8. DC-OK Relay Contact ..........................................8

9. Efficiency and Power Losses................................9

10. Lifetime Expectancy and MTBF.........................10

11. Functional Diagram...........................................10

12. Terminals and Wiring........................................11

13. Front Side and User Elements...........................12

14. EMC....................................................................13

15. Environment......................................................14

16. Protection Features...........................................15

17. Safety Features..................................................15

18. Dielectric Strength ............................................16

19. Approvals...........................................................16

20. Physical Dimensions and Weight......................17

21. Accessories ........................................................ 18

21.1. ZM1.WALL – Wall/Panel mounting..........18

21.2. ZM14.SIDE - Side Mounting Bracket........19

21.3. UF20.241 - Buffer module........................20

21.4. YR40.241 - Redundancy Module..............20

22. Application Notes............................................. 21

22.1. Repetitive Pulse Loading..........................21

22.2. Peak Current Capability ...........................22

22.3. External Input Protection.........................22

22.4. Using only 2 Legs of a 3-Phase System ....23

22.5. Charging of Batteries ...............................23

22.6. Output Circuit Breakers............................24

22.7. Series Operation .......................................24

22.8. Parallel Use to Increase Output Power....25

22.9. Parallel Use for Redundancy....................25

22.10. Inductive and Capacitive Loads................25

22.11. Back-feeding Loads ..................................26

22.12. Use in a Tightly Sealed Enclosure ............26

22.13. Mounting Orientations ............................27

The information given in this document is correct to the best of our knowledge and experience at the time of publication. If not

expressly agreed otherwise, this information does not represent a warranty in the legal sense of the word. As the state of our

knowledge and experience is constantly changing, the information in this data sheet is subject to revision. We therefore kindly ask

you to always use the latest issue of this document (available under www.pulspower.com). No part of this document may be

reproduced or utilized in any form without our prior permission in writing.

Some parts of this unit are patent by PULS (US patent No 091662,063, Des. 424,529, …).

No part of this document may be reproduced or utilized in any form without permission in writing from PULS GmbH.

TERMINOLOGY AND ABREVIATIONS

PE and

symbol

PE is the abbreviation for Protective Earth and has the same meaning as the symbol

This document uses the term “earth” which is the same as the U.S. term “ground”.

To be defined, value or description will follow later.

.

Earth, Ground

T.B.D.

AC 400V

A figure displayed with the AC or DC before the value represents a nominal voltage with

standard tolerances included.

E.g.: DC 12V describes a 12V battery disregarding whether it is full (13.7V) or flat (10V)

400Vac

A figure with the unit (Vac) at the end is a momentary figure without any additional

tolerances included.

50Hz vs. 60Hz

may

As long as not otherwise stated, AC 230V parameters are valid at 50Hz mains frequency.

A key word indicating flexibility of choice with no implied preference.

A key word indicating a mandatory requirement.

shall

should

A key word indicating flexibility of choice with a strongly preferred implementation.

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

2/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

1. INTENDED USE

This device is designed for installation in an enclosure and is intended for the general professional use such as in

industrial control, office, communication, and instrumentation equipment.

Do not use this power supply in equipment, where malfunction may cause severe personal injury or threaten human

life.

2. INSTALLATION REQUIREMENTS

This device may only be installed and put into operation by qualified personnel.

This device does not contain serviceable parts.

The tripping of an internal fuse is caused by an internal defect.

If damage or malfunction should occur during installation or operation, immediately turn power off and send unit to

the factory for inspection.

Mount the unit on a DIN-rail so that the input terminals are located on the bottom of the unit. For other mounting

orientations see de-rating requirements in this document. See chapter 22.13.

This device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do

not cover ventilation grid (e.g. cable conduits) by more than 15%!

Keep the following installation clearances:

40mm on top,

20mm on the bottom,

5mm on the left and right sides are recommended when the device is loaded permanently with more than 50% of the

rated power. Increase this clearance to 15mm in case the adjacent device is a heat source (e.g. another power supply).

Caution: For use in a controlled environment according to CSA 22.2 No 107.1-01.

WARNING

Risk of electrical shock, fire, personal injury or death.

- Do not use the power supply without proper grounding (Protective Earth). Use the terminal on the input block for

earth connection and not one of the screws on the housing.

- Turn power off before working on the device. Protect against inadvertent re-powering.

- Make sure that the wiring is correct by following all local and national codes.

- Do not modify or repair the unit.

- Do not open the unit as high voltages are present inside.

- Use caution to prevent any foreign objects from entering the housing.

- Do not use in wet locations or in areas where moisture or condensation can be expected.

- Do not touch during power-on, and immediately after power-off. Hot surfaces may cause burns.

Notes for use in hazardous location areas:

The QT20.241 is suitable for use in Class I Division 2 Groups A, B, C, D locations.

WARNING EXPLOSION HAZARDS!

Substitution of components may impair suitability for this environment. Do not disconnect the unit or operate the

voltage adjustment unless power has been switched off or the area is known to be non-hazardous.

A suitable enclosure must be provided for the end product which has a minimum protection of IP54 and fulfils the

requirements of the EN 60079-15:2010.

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

3/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

3. AC-INPUT

The unit is optimized to operate on a three phase system. An operation on only two legs of a three-phase system is

possible with slightly different parameters. See chapter 22.4 for details.

AC input

AC input range

Suitable mains systems

Allowed voltage L to Earth

Input frequency

nom.

min.

3AC 380-480V

3x 323-552Vac

TN, TT, IT

Wide-range input

Continuous operation

Line (L) must not be earthed (grounded)

Continuous, IEC 60664-1

max.

nom.

typ.

400Vac

50–60Hz

6%

Turn-on voltage

Shut-down voltage

3x 263Vac

3x 242Vac

Steady-state value, load independent, see Fig. 3-1

typ.

3AC 400V

0.79A

0.94

350ms

30ms

3AC 480V

Input current

Power factor^*)

Start-up delay

Rise time

typ.

0.65A

0.95

290ms

30ms

40ms

At 24V, 20A, see Fig. 3-3

At 24V, 20A, see Fig. 3-4

See Fig. 3-2

At 24V, 20A, only resistive load see Fig. 3-2

At 24V, 20A, resistive load with an

additional 20mF capacitor

40ms

Turn-on overshoot

max.

500mV

See Fig. 3-2

*) The power factor is the ratio of the true (or real) power to the apparent power in an AC circuit.

Fig. 3-1 Input voltage range

Fig. 3-2 Turn-on behavior, definitions

P_OUT

Input

Rated input range

Voltage

L1 L2 L3

- 5%

Output

Voltage

V_IN

552Vac

Start-up Rise

delay Time

242V 263V

323V

Fig. 3-3 Input current vs. output load at 24V

Fig. 3-4 Power factor vs. output load at 24V

Input Current, typ.

Power Factor, typ.

1.0

0.8A

0.7

0.6

0.5

0.4

0.3

0.2

3x

0.95

0.9

480Vac

0.85

0.8

3x

400Vac

0.1

Output Current

0.75

0

2

4

6

8 10 12 14 16 18

20A

2

4

6

8

10 12 14 16 18 20A

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

4/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

4. INPUT INRUSH CURRENT

The power supply is equipped with an active inrush current limitation circuit, which limits the input inrush current

after turn-on and after short input voltage interruptions to a very low value.

3AC 400V

10A_peak

3A_peak

3AC 480V

10A_peak

3A_peak

Inrush current^*)

max.

typ.

max.

typ.

Over entire temperature range

Inrush energy

Inrush delay

1A²s

270ms

220ms

*) The charging current into EMI suppression capacitors is disregarded in the first microseconds after switch-on.

Fig. 4-1 Typical turn-on behavior at nominal

load and 25°C ambient temperature

Input Current 2A/DIV

Inrush

Delay

Input Voltage 1000V/DIV

Output Voltage

5. DC-INPUT

Do not operate this power supply with DC-input voltage.

Investigate using the QTD20.241 instead for DC-input voltages.

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

5/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

6. OUTPUT

Output voltage

Adjustment range

nom.

min.

max.

typ.

24V

24-28V

30V^***)

24.1V

10mV

100mV

100mVpp

20A

17.5A

30A

26A

Guaranteed

At clockwise end position of potentiometer

0.2%, at full load, cold unit

At 3x 323-552Vac voltage change

Static value, 0AÆ20A

20Hz to 20MHz, 50Ohm

At 24V, see Fig. 6-1

Factory setting

Line regulation

Load regulation

Ripple and noise voltage

Output current – continuous

max.

nom.

typ.

At 28V, see Fig. 6-1

Output current – up to 4s^*)

At 24V, see Fig. 6-1 and Fig. 6-2

At 28V, see Fig. 6-1 and Fig. 6-2

At 24-28V

Output power – continuous

Output power – up to 4s^*)

BonusPower^®time

480W

720W^*)

4s

At 24-28V

Duration until the output voltage dips, see Fig. 6-2

Overload free time to reset power manager, see Fig.

6-3

BonusPower^®recovery time

typ.

7s

Overload behavior

cont. current

20A

23A

30A

34A

See Fig. 6-1

Short-circuit current^**)

min.

max.

min.

max.

typ.

Continuous, load impedance 50mOhm, see Fig. 6-1

Short-term (4s), load impedance 50mOhm, see Fig. 6-1

Continuous, load impedance <10mOhm

Included in the power supply

25A

Output capacitance

950μF

*)

BonusPower^®, short term power capability (up to typ. 4s)

The power supply is designed to support loads with a higher short-term power requirement without damage or shutdown. The short-

term duration is hardware controlled by an output power manager. This BonusPower^®is repeatedly available. Detailed information

can be found in chapter 22.1. If the power supply is loaded longer with the BonusPower^®than shown in the bonus-time diagram (see

Fig. 6-2), the max. output power is automatically reduced to 480W.

**)

Discharge current of output capacitors is not included.

***)

This is the maximum output voltage which can occur at the clockwise end position of the potentiometer due to tolerances. It is not

guaranteed value which can be achieved. The typical value is about 28.5V.

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

6/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

Fig. 6-1 Output voltage vs. output current, typ.

Output Voltage

Adjustment Range

28V

A

B

24

20

16

12

8

Continuously

available

Short-term (4s)

BonusPower

A

B

A

B

4

0

Output Current

0

5

10

15

20

25

30 35A

Fig. 6-2 Bonus time vs. output power

Fig. 6-3 BonusPower^®recovery time

Bonus Time

Limitation by

5s

Power

Power Manager

max.

min.

Demand

4

3

2

1

0

100%

t

Recovery Time

Bonus Power disabled

Bonus

Time

Output

Voltage

Output Power

130 140

110

120

150

160%

The BonusPower^®is available as soon as power comes on and after the end of an output short circuit or output

overload.

Fig. 6-4 BonusPower^®after input turn-on

Fig. 6-5 BonusPower^®after output short

Short of

Output

Input

Voltage

Output

Voltage

Output

Voltage

Bonus

Power

150%

Bonus

Power

150%

Output

Power

100%

Output

Power

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

7/27

www.pulspower.com Phone +49 89 9278 0 Germany

QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

7. HOLD-UP TIME

3AC 400V

44ms

3AC 480V

Hold-up Time

typ.

min.

typ.

min.

44ms

36ms

22ms

18ms

At 24V, 10A, see Fig. 7-1

At 24V, 20A, see Fig. 7-1

36ms

22ms

18ms

Fig. 7-1 Hold-up time vs. input voltage

Fig. 7-2 Shut-down behavior, definitions

Hold-up Time

50ms

L1 L2 L3

Input

Voltage

40

30

20

- 5%

Output

Voltage

10

Hold-up Time

Input Voltage

0

320

360

400

440 3x480Vac

8. DC-OK RELAY CONTACT

This feature monitors the output voltage, which is produced by the power supply itself. It is independent of a back-fed

voltage from a unit connected in parallel to the power supply output.

Contact closes

Contact opens

As soon as the output voltage reaches the adjusted output voltage.

As soon as the output voltage dips more than 10% below the adjusted output voltage.

Short dips will be extended to a signal length of 250ms. Dips shorter than 1ms will be ignored.

Contact re-closes

Contact ratings

As soon as the output voltage exceeds 90% of the adjusted voltage.

max.

min.

60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A

1mA at 5Vdc

Resistive load

Min. permissible load

Isolation voltage

See dielectric strength table in section 18.

Fig. 8-1 DC-ok relay contact behavior

V_OUT= V_ADJ

0.9* V_ADJ

10%

<

>

250ms

1ms

open

closed

open

closed

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

8/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

9. EFFICIENCY AND POWER LOSSES

3AC 400V

95.0%

94.2%

3AC 480V

94.8%

93.6%

Efficiency

Average efficiency^*)

typ.

At 24V, 20A

25% at 5A, 25% at 10A, 25% at 15A and

25% at 20A

Power losses

typ.

8.2W

14.5W

25.3W

10.0W

16.0W

26.4W

At 24V, 0A (no load)

At 24V, 10A (half load)

At 24V, 20A (full load)

*) The average efficiency is an assumption for a typical application where the power supply is loaded with 25% of the nominal load for 25%

of the time, 50% of the nominal load for another 25% of the time, 75% of the nominal load for another 25% of the time and with 100%

of the nominal load for the rest of the time.

Fig. 9-1 Efficiency vs. output current at 24V,

Fig. 9-2 Losses vs. output current at 24V, typ.

typ.

Efficiency

Power Losses

96%

95

94

93

92

91

90

89

88

30W

25

20

(a) 3x 400Vac

15

(b) 3x 480Vac

(a) 3x 400Vac

(b) 3x 480Vac

(a)

(b)

(a)

10

5

Output Current

10 12 14 16 18 20A

Output Current

10 12 14 16 18 20A

0

4

6

8

0

2

4

6

8

Fig. 9-3 Efficiency vs. input voltage at 24V,

Fig. 9-4 Losses vs. input voltage at 24V, 20A,

20A, typ.

typ.

Efficiency

Power Losses

95.4%

27W

95.2

95.0

94.8

94.6

94.4

26.5

26.0

25.5

25.0

24.5

Input Voltage

94.2

24.0

350

400

450

500 3x550Vac

350

400

450

500 3x550Vac

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

9/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

10. LIFETIME EXPECTANCY AND MTBF

3AC 400V

495 000h ^*)

175 000h ^*)

297 000h ^*)

105 000h

1 194 000h

690 000h

389 000h

284 000h

3AC 480V

Calculated lifetime expectancy*)

485 000h ^*)

171 000h ^*)

299 000h ^*)

106 000h

1 159 000h

670 000h

371 000h

271 000h

At 24V, 10A and 25°C

At 24V, 10A and 40°C

At 24V, 20A and 25°C

At 24V, 20A and 40°C

At 24V, 20A and 25°C

At 24V, 20A and 40°C

At 24V, 20A and 25°C; Ground Benign GB25

At 24V, 20A and 40°C; Ground Benign GB40

MTBF**) SN 29500, IEC 61709

MTBF**) MIL HDBK 217F

*) The calculated lifetime expectancy shown in the table indicates the minimum operating hours (service life) and is determined by the

lifetime expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours and is calculated according

to the capacitor’s manufacturer specification. The manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15

years (131 400h). Any number exceeding this value is a calculated theoretical lifetime which can be used to compare devices.

**) MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures, and indicates reliability of a

device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily represent the life of a product.

The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000h means that

statistically one unit will fail every 100 hours if 10 000 units are installed in the field. However, it can not be determined if the failed unit

has been running for 50 000h or only for 100h.

11. FUNCTIONAL DIAGRAM

Fig. 11-1 Functional diagram

Output

Voltage

Regulator

V_OUT

L1

L2

L3

Input Filter

+

-

Input Rectifier

Inrush Limiter

Transient Filter

PFC

Converter

Output

Filter

Power

Converter

Overload

LED

DC-ok

LED

Temper-

Output

Voltage

Monitor

Output

ature

Shut-

down

Over-

Voltage

Power

Manager

DC ok

Relay

Protection

DC-ok

Contact

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

10/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

12. TERMINALS AND WIRING

The terminals are IP20 Finger safe constructed and suitable for field and factory wiring.

All terminals

Type

Solid wire

Stranded wire

Quick-connect spring-clamp terminals

Max. 6mm²

Max. 4mm²

American Wire Gauge

Wire diameter

Max. AWG10

Max. 2.8mm (including ferrules)

Typ. 10mm / 0.4inch

Not applicable

Wire stripping length

Screwdriver

Recommended tightening torque

Not applicable

Instructions:

a) Use appropriate copper cables that are designed for minimum

operating temperatures of:

60°C for ambient up to 45°C and

75°C for ambient up to 60°C minimum

90°C for ambient up to 70°C minimum.

b) Follow national installation codes and installation regulations!

c) Ensure that all strands of a stranded wire enter the terminal

connection!

d) Do not use the unit without PE connection.

e) Ferrules are allowed.

1. Insert the wire

2. Snap the lever

To disconnect wire: same procedure

vice versa

Daisy chaining:

Daisy chaining (jumping from one power supply output to the next) is allowed as long as the average output current

through one terminal pin does not exceed 27A. If the current is higher, use a separate distribution terminal block as

shown in Fig. 12-2.

Fig. 12-1 Daisy chaining of outputs

Fig. 12-2 Using distribution terminals

Distribution

Terminals

Power

Supply

Power

Supply

Power

Supply

Power

Supply

Load

+

- -

+ +

- -

Output

Load

+

- -

+ +

- -

Output

+

-

Output

+

-

max 27A

continuous!

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

11/27

www.pulspower.com Phone +49 89 9278 0 Germany

QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

13. FRONT SIDE AND USER ELEMENTS

Fig. 13-1 Front side

A

B

Input Terminals (Quick-connect spring-clamp terminals)

L1, L2, L3 Line input

...PE (Protective Earth) input

Output Terminals (Quick-connect spring-clamp terminals, two pins

per pole)

+

–

Positive output

Negative (return) output

C

Output Voltage Potentiometer

Multi turn potentiometer;

Open the flap to set the output voltage.

Factory set: 24.1V at full output current

D DC-OK LED (green)

On, when the voltage on the output terminals is >90% of the

adjusted output voltage.

E

F

Overload LED (red)

- On, when the voltage on the output terminals is <90% of the

adjusted output voltage, or in case of a short circuit in the output.

- On, when the unit has switched off due to over-temperature.

- Input voltage is always required

DC-OK Relay Contact (Quick-connect spring-clamp terminals)

The DC-OK relay contact is synchronized with the DC-OK LED.

See chapter 8 for details.

Overload LED

DC-OK LED

DC-OK Contact

Indicators, LEDs:

Normal mode

OFF

ON

OFF

ON

OFF

Closed

Open

During BonusPower^®

Overload (Vout < 90%)

Output short circuit

Temperature Shut-down

No input power

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

12/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

14. EMC

The power supply is suitable for applications in industrial environment as well as in residential, commercial and light

industry environment without any restrictions.

All results assume a three phase operation of the power supply.

EMC Immunity

According to generic standards: EN 61000-6-1 and EN 61000-6-2

Electrostatic discharge

EN 61000-4-2

contact discharge

air discharge

8kV

15kV

Criterion A

Electromagnetic RF field

Fast transients (Burst)

EN 61000-4-3

EN 61000-4-4

80MHz-2.7GHz

10V/m

Criterion A

input lines

output lines

DC-OK signal (coupling clamp)

4kV

2kV

1kV

Criterion A

Surge voltage on input

Surge voltage on output

EN 61000-4-5

L1 Æ L2, L2 Æ L3, L1 Æ L3

L1 / L2 / L3 Æ PE

+ Æ -

2kV

4kV

500V

1kV

Criterion A

+ / - Æ PE

Surge voltage on DC-OK

Conducted disturbance

Mains voltage dips

EN 61000-4-5

EN 61000-4-6

EN 61000-4-11

DC-OK signal Æ PE

1kV

10V

0Vac, 20ms

Criterion A

Criterion A,

Criterion A

0.15-80MHz

0% of 380Vac (0Vac)

0% of 480Vac (0Vac)

(Dips on three phases)

Mains voltage dips

(Dips on two phases)

EN 61000-4-11

40% of 380Vac (152Vac)

40% of 480Vac (192Vac)

70% of 380Vac (266Vac)

70% of 480Vac (336Vac)

200ms

500ms

Criterion A

Voltage interruptions

Voltage sags

EN 61000-4-11

SEMI F47 0706

0Vac

5000ms

Criterion C

dips on two phases according to section 7.2. of the SEMI F47 standard

80% of 380Vac (304Vac)

70% of 380Vac (266Vac)

50% of 380Vac (160Vac)

1000ms

500ms

200ms

Criterion A

Powerful transients

VDE 0160

over entire load range

1550V, 1.3ms

Criterion A

Criterions:

A: Power supply shows normal operation behavior within the defined limits.

C: Temporary loss of function is possible. Power supply may shut-down and restarts by itself. No damage or hazards for the power supply

will occur.

EMC Emission

According to generic standards: EN 61000-6-3 and EN 61000-6-4

Conducted emission

input lines

EN 55011, EN 55022, FCC Part 15, CISPR 11, CISPR 22

Class B

Conducted emission

output lines

IEC/CISPR 16-1-2, IEC/CISPR 16-2-1

12dB higher than average limits

for DC power port according to

EN 61000-6-3^**)

Radiated emission

Harmonic input current

EN 55011, EN 55022

EN 61000-3-2

Class B

fulfilled for class A equipment

fulfilled^*)

Voltage fluctuations, flicker EN 61000-3-3

This device complies with FCC Part 15 rules.

Operation is subjected to following two conditions: (1) this device may not cause harmful interference, and (2) this

device must accept any interference received, including interference that may cause undesired operation.

*)

Tested with constant current loads, non pulsing

**) Restrictions apply for applications in residential, commercial and light-industrial environments, where local DC power networks according

to EN 61000-6-3 are involved. No restrictions for all kinds of industrial applications.

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

13/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

Switching Frequencies

The power supply has three converters with three different switching frequencies

included. One is nearly constant. The others are input voltage and load dependent.

Switching frequency 1

Switching frequency 2

Switching frequency 3

100kHz

30kHz to 90kHz

40kHz to 220kHz

Resonant converter, nearly constant

Boost converter, load dependent

PFC converter, input voltage and load dependent

15. ENVIRONMENT

Operational temperature^*)

Storage temperature

Output de-rating

-25°C to +70°C (-13°F to 158°F)

-40 to +85°C (-40°F to 185°F)

12W/°C

Reduce output power according Fig. 15-1

For storage and transportation

60-70°C (140°F to 158°F)

IEC 60068-2-30

Humidity^**)

5 to 95% r.H.

Vibration sinusoidal

2-17.8Hz: 1.6mm; 17.8-500Hz: 2g

2 hours / axis

IEC 60068-2-6

Vibration random

Shock

0.5m²(s³)

2 hours / axis

30g 6ms, 20g 11ms

3 bumps / direction, 18 bumps in total

IEC 60068-2-64

IEC 60068-2-27

Altitude

0 to 2000m (0 to 6 560ft)

Without any restrictions

2000 to 6000m (6 560 to 20 000ft)

Reduce output power or ambient

temperature, see Fig. 15-2

IEC 62103, EN 50178, overvoltage category II

Altitude de-rating

30W/1000m or 5°C/1000m

> 2000m (6500ft), see Fig. 15-2

Over-voltage category

III

II

2

IEC 62103, EN 62477-1, altitudes up to 2000m

For altitudes from 2000m to 6000m

IEC 62103, EN 62477-1, not conductive

Degree of pollution

LABS compatibility

The unit does not release any silicone or other LABS-critical substances and is suitable for

use in paint shops.

*) Operational temperature is the same as the ambient or surrounding temperature and is defined as the air temperature 2cm below the

unit. Curves and figures for operation on only 2 legs of a 3-phase system can be found in chapter 22.4.

**) Do not energize while condensation is present.

Fig. 15-1 Output current vs. ambient temp.

Fig. 15-2 Output current vs. altitude

Allowed Output

Current at 24V

Allowed Output

Current at 24V

30A

for typ.

4s

for typ.

25

4s

25

20

15

10

5

C

20

B

continu

ous

continu

ous

A

15

10

5

A... Tamb

B... Tamb

C... Tamb

< 60°C

< 50°C

< 40°C

Ambient Temperature

20 40 60 70°C

Altitude

0

-25

0

2000

4000

6000m

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

14/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

16. PROTECTION FEATURES

Output protection

Electronically protected against overload, no-load and short-circuits^*)

Output over-voltage protection

typ. 32Vdc

max. 35Vdc

In case of an internal power supply defect, a redundant

circuit limits the maximum output voltage. The output

shuts down and automatically attempts to restart.

Degree of protection

IP 20

EN/IEC 60529

Penetration protection

Over-temperature protection

Input transient protection

Internal input fuse

> 3.5mm

yes

E.g. screws, small parts

Output shut-down with automatic restart

MOV (Metal Oxide Varistor)

Not included

*) In case of a protection event, audible noise may occur.

17. SAFETY FEATURES

Input / output separation^*)

SELV

IEC/EN 60950-1

PELV

I

> 500MOhm

< 0.1Ohm

IEC/EN 60204-1, EN 62477-1, IEC 62103, IEC 60364-4-41

PE (Protective Earth) connection required

Input to output, 500Vdc

Class of protection

Isolation resistance

PE resistance

Touch current (leakage current)

typ. 0.44mA / 0.94mA

typ. 0.62mA / 1.31mA

max. 0.54mA / 1.12mA

max. 0.78mA / 1.62mA

At 3x400Vac, 50Hz, TN-,TT-mains / IT-mains

At 3x480Vac, 60Hz, TN-,TT-mains / IT-mains

At 3x440Vac, 50Hz, TN-,TT-mains / IT-mains

At 3x528Vac, 60Hz, TN-,TT-mains / IT-mains

*) double or reinforced insulation

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

15/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

18. DIELECTRIC STRENGTH

The output voltage is floating and has no ohmic connection to the ground. Type and factory tests are conducted by

the manufacturer. Field tests may be conducted in the field using the appropriate test equipment which applies the

voltage with a slow ramp (2s up and 2s down). Connect all phase terminals together as well as all output poles before

conducting the test. When testing, set the cut-off current settings to the value in the table below.

Fig. 18-1 Dielectric strength

A

B

C

D

Type test

Factory test

Field test

60s

5s

2500Vac 3000Vac

2500Vac 2500Vac

2000Vac 2000Vac

500Vac

> 30mA

500Vac

> 1mA

Input

L1

L2

L3

DC-ok

B^*)

5s

Cut-off current setting > 10mA

> 10mA

D

A

To fulfil the PELV requirements according to EN 60204-1 § 6.4.1, we

recommend that either the + pole, the – pole or any other part of

the output circuit shall be connected to the protective earth

system. This helps to avoid situations in which a load starts

unexpectedly or can not be switched off when unnoticed earth

faults occur.

Output

Earth

+

C

-

B*) When testing input to DC-OK ensure that the max. voltage between DC-OK and the output is not exceeded (column D). We recommend

connecting DC-OK pins and the output pins together when performing the test.

19. APPROVALS

EC Declaration of Conformity

IEC 60950-1 2^ndEdition

UL 508

The CE mark indicates conformance with the

- EMC directive and the

- Low-voltage directive

CB Scheme,

Information Technology Equipment

Applicable for altitudes up to 2000m.

Listed for use as Industrial Control Equipment;

U.S.A. (UL 508) and Canada (C22.2 No. 107-1-01);

E-File: E198865

Recognized for use as Information Technology Equipment,

Level 5; U.S.A. (UL 60950-1) and Canada (C22.2 No. 60950-1);

E-File: E137006 Applicable for altitudes up to 2000m.

IND. CONT. EQ.

UL 60950-1, 2^ndEdition

ANSI / ISA 12.12.01-2007

(Class I Div 2)

Recognized for use in Hazardous Location Class I Div 2 T4

Groups A,B,C,D systems; U.S.A. (ANSI / ISA 12.12.01-2007) and

Canada (C22.2 No. 213-M1987)

SEMI F47

SEMI F47-0706 Ride-through compliance for the

semiconductor industry. Full SEMI range compliance (Dips on

two phases: 304Vac for 1000ms, 266Vac for 500ms and 190Vac

for 200ms, Pout < 480W)

Marine

GL (Germanischer Lloyd) classified and ABS (American Bureau

for Shipping) PDA Environmental category: C, EMC2 Marine

and offshore application

EAC TR Registration

Registration for the Eurasian Customs Union market

(Russia, Kazakhstan, Belarus)

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

16/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

20. PHYSICAL DIMENSIONS AND WEIGHT

Width

Height

Depth

65mm 2.56’’

124mm 4.88’’

127mm 5.0’’

The DIN-rail height must be added to the unit depth to calculate the total required

installation depth.

Weight

870g / 1.92lb

DIN-Rail

Use 35mm DIN-rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.

Housing material

Body: Aluminium alloy

Cover: zinc-plated steel

Installation clearances

See chapter 2

Fig. 20-1 Front view

Fig. 20-2 Side view

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

17/27

www.pulspower.com Phone +49 89 9278 0 Germany

QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

21. ACCESSORIES

21.1. ZM1.WALL – WALL/PANEL MOUNTING

This bracket is used to mount the QT20 power supply on a wall/panel without utilizing a DIN-

Rail.

The two aluminum brackets and the black plastic slider of the unit have to be detached, so that

the steel brackets can be mounted.

Fig. 21-1 Wall/panel mounting

Fig. 21-2 Mounting Dimensions - Wall mounting bracket

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

18/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

21.2. ZM14.SIDE - SIDE MOUNTING BRACKET

This bracket is used to mount the QT20 power supply sideways with or without utilizing a DIN-

Rail.

The two aluminum brackets and the black plastic slider of the unit have to be detached, so that

the steel brackets can be mounted.

For sideway DIN-rail mounting, the removed aluminum brackets and the black plastic slider need

to be mounted on the steel bracket.

Fig. 21-3

Side mounting without DIN-

rail brackets

Fig. 21-4

Side mounting with DIN-rail

brackets

Fig. 21-5

Mounting Dimensions

Side mounting bracket

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

19/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

21.3. UF20.241 - BUFFER MODULE

This buffer unit is a supplementary device for DC 24V power supplies. It delivers power

to bridge typical mains failures or extends the hold-up time after turn-off of the AC

power. In times when the power supply provides sufficient voltages, the buffer unit

stores energy in the integrated electrolytic capacitors. In case of mains voltage fault, this

energy is released again in a regulated process.

The buffer unit does not require any control

Power

Supply

Buffer

Unit(s)

Load

wiring. It can be added in parallel to the load

circuit at any given point. Buffer units can be

added in parallel to increase the output ampacity

or the hold-up time.

AC

DC

+

-

21.4. YR40.241 - REDUNDANCY MODULE

The YR40.241 redundancy module is equipped with two input channels (20A each), which

are individually decoupled by utilizing MOSFET technology. The output current can go as

high as 40A.

Using MOSFET instead of diodes reduces the heat generation and the voltage drop

between input and output. The YR40.241 does not require an additional auxiliary voltage

and is self-powered even in case of a short circuit across the output.

Due to the low power losses, the unit is very slender and only requires 36mm width on the

DIN-rail.

Fig. 21-7 Typical N+1 Redundant configuration for 60A with two dual

Fig. 21-6 Typical 1+1 Redundant configuration for

20A with one dual redundancy module und two

power supplies

redundancy modules and four power supplies

Failure

Monitor

+

-

2

-

+

-

2

-

+

-

2

-

+ + - -

+ + - - _DC-

+ + - -

Input Input

DC-

OK

DC-

OK

DC-

OK

DC-

OK

24V,20A

1

24V,20A

OK

24V,20A

OK

1

24V,20A

1

YR40.241

Redundancy

Module

YR40.241

Redundancy

Module

YR40.241

Redundancy

Module

QT20.241

Output

+

-

L1 L2 L3 PE

+

L1 L2 L3 PE

-

L1 L2 L3 PE

+

-

20A

Load

60A

Load

I

L1

L2

L3

PE

L1

L2

L3

PE

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

20/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

22. APPLICATION NOTES

22.1. REPETITIVE PULSE LOADING

Typically, a load current is not constant and varies over time. This power supply is designed to support loads with a

higher short-term power demand (=BonusPower^®). The short-term duration is hardware controlled by an output

power manager and is available on a repeated basis. If the BonusPower^®load lasts longer than the hardware

controller allows it, the output voltage will dip and the next BonusPower^®is available after the BonusPower^®recovery

time (see chapter 6) has elapsed.

To avoid this, the following rules must be met:

a) The power demand of the pulse must be below 150% of the nominal output power.

b) The duration of the pulse power must be shorter than the allowed BonusPower^®time. (see output section)

c)

The average (R.M.S.) output current must be below the specified continuous output current.

If the R.M.S. current is higher, the unit will respond with a thermal shut-down after a period of time. Use the

maximum duty cycle curve (Fig. 22-2) to check if the average output current is below the nominal current.

d) The duty cycle must be below 0.75.

Fig. 22-1 Repetitive pulse loads, definitions

Fig. 22-2 Max. duty cycle curve

P

₀= 10%

₀= 50%

₀= 75%

Duty Cycle

0.75

P_PEAKT_PEAK

T₀

max.

150%

0.6

0.4

0.2

100%

P₀= 100%

P₀

P_PEAK

140 150%

0

100

110

120

130

T

peak

P₀

Base load (W)

D

utyCycle =

P_PEAKPulse load (above 100%)

T₀Duration between pulses (s)

T_PEAKPulse duration (s)

T

peak + T0

T

peak

-

(Duty

C

ycle x Tpeak

)

T₀=

D

utyC

ycle

Example: A load is powered continuously with 240W (= 50% of the rated output load). From time to time a peak

power of 720W (= 150% of the rated output load) is needed for 1 second.

The question is: How often can this pulse be supplied without overloading the power supply?

- Make a vertical line at P_PEAK= 150% and a horizontal line where the vertical line crosses the P₀= 50%

curve. Read the max. duty cycle from the duty cycle-axis (= 0.37)

- Calculate the required pause (base load) length T₀:

Tpeak

-

(Duty

C

ycle x Tpeak

ycle

)

1s

-

(0.37 x 1s)

0.37

- Result: The required pause length = 1.7s

T₀=

=

=1.7s

Duty

C

- Max. repetition rate = pulse +pause length = 2.7s

More examples for pulse load compatibility:

P_PEAK

P₀

480W 1s

0W 1s

240W 1s

T_PEAK

T₀

P_PEAK

P₀

T_PEAK

T₀

720W

600W

>25s

>1.3s

> 0.75s

720W

240W 0.1s

240W 1s

240W 3s

>0.16s

>1.6s

>4.9s

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

21/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

22.2. PEAK CURRENT CAPABILITY

The power supply can deliver peak currents (up to several milliseconds) which are higher than the specified short term

currents.

This helps to start current demanding loads. Solenoids, contactors and pneumatic modules often have a steady state

coil and a pick-up coil. The inrush current demand of the pick-up coil is several times higher than the steady-state

current and usually exceeds the nominal output current (including the BonusPower^®). The same situation applies when

starting a capacitive load.

The peak current capability also ensures the safe operation of subsequent circuit breakers of load circuits. The load

branches are often individually protected with circuit breakers or fuses. In case of a short or an overload in one branch

circuit, the fuse or circuit breaker need a certain amount of over-current to open in a timely manner. This avoids

voltage loss in adjacent circuits.

The extra current (peak current) is supplied by the power converter and the built-in large sized output capacitors of

the power supply. The capacitors get discharged during such an event, which causes a voltage dip on the output. The

following two examples show typical voltage dips:

Fig. 22-3 Peak load with 2x the nominal

Fig. 22-4 Peak load with 4x the nominal

current for 50ms, typ.

current for 5ms, typ.

Output

Voltage

Output

Voltage

24V

18V

16.5V

80A

40A

Output

Current

Output

Current

0A

2ms/DIV

20ms/DIV

40A Peak load (resistive) for 50ms

Output voltage dips from 24V to 18V.

80A Peak load (resistive) for 5ms

Output voltage dips from 24V to 16.5V.

Please note: The DC-OK relay triggers when the voltage dips more than 10% for longer than 1ms.

Peak current voltage dips

typ.

from 24V to 18V

from 24V to 19V

from 24V to 16.5V At 80A for 5ms, resistive load

At 40A for 50ms, resistive load

At 80A for 2ms, resistive load

22.3. EXTERNAL INPUT PROTECTION

The unit is tested and approved for branch circuits up to 15A (U.S.A.) and 16A (IEC). An external protection is only

required if the supplying branch has an ampacity greater than this. Check also local codes and local requirements. In

some countries local regulations might apply.

If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of

the circuit breaker. A minimum value of 6A B- or 3A C-Characteristic breaker should be chosen.

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

22/27

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QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

22.4. USING ONLY 2 LEGS OF A 3-PHASE SYSTEM

No external protection devices are required to protect against a phase-loss

failure.

L1

L2

L3

PE

Power Supply

AC

This power supply can also be permanently operated on two legs of a 3-

phase system. However, it is not recommended for this power class since the

supplying 3-phase network can become unbalanced.

L1

L2

L3

open

The output power must be reduced according to the curves below when

operation on only two legs of a 3-phase system. A long-term exceeding of

these limits will result in a thermal shut-down of the unit.

DC

EMC performance, hold-up time, losses and output ripple differ from a three phase operation. Therefore, check

suitability of your individual application.

Such use is not included in the UL approval. Additional tests might be necessary when the complete system has to be

approved according to UL 508 or UL60950-1.

Fig. 22-5

Fig. 22-6

Output current vs. ambient temperature -

2-phase operation

Hold-up time – 2-phase operation

Hold-up Time for Use on only Two Legs of a

Three Phase System

50ms

Allowed Output Current at 24V

30A

for typ.

4s

25

20

15

10

5

40

continu

ous

A

30

20

B

A... 2x 46

B... 2x 34

0 to 552Va

0 to 460Va

c

10

Ambient Temperature

20 40 60 70°C

Input Voltage

0

-25

0

320

360

400

440 2x480Vac

22.5. CHARGING OF BATTERIES

The power supply can be used to charge lead-acid or maintenance free batteries. (Two 12V batteries in series)

Instructions for charging batteries:

a) Set output voltage (measured at no load and at the battery end of the cable) very precisely to the end-of-charge

voltage.

End-of-charge voltage

Battery temperature

27.8V

10°C

27.5V

20°C

27.15V

30°C

26.8V

40°C

b) Use a 25A circuit breaker (or blocking diode) between the power supply and the battery.

c) Ensure that the output current of the power supply is below the allowed charging current of the battery.

d) Use only matched batteries when putting 12V types in series.

e) The return current to the power supply (battery discharge current) is typ. 16mA when the power supply is

switched off (except in case a blocking diode is utilized).

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

23/27

www.pulspower.com Phone +49 89 9278 0 Germany

QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

22.6. OUTPUT CIRCUIT BREAKERS

Standard miniature circuit breakers (MCB’s or UL1077 circuit breakers) are commonly used for AC-supply systems and

may also be used on DC branches.

MCB’s are designed to protect wires and circuits. If the ampere value and the characteristics of the MCB are adapted to

the wire size that is used, the wiring is considered as thermally safe regardless of whether the MCB opens or not.

To avoid voltage dips and under-voltage situations in adjacent 24V branches which are supplied by the same source, a

fast (magnetic) tripping of the MCB is desired. A quick shutdown within 10ms is necessary corresponding roughly to

the ride-through time of PLC's. This requires power supplies with high current reserves and large output capacitors.

Furthermore, the impedance of the faulty branch must be sufficiently small in order for the current to actually flow.

The best current reserve in the power supply does not help if Ohm’s law does not permit current flow. The following

table has typical test results showing which B- and C-Characteristic MCBs magnetically trip depending on the wire cross

section and wire length.

Maximal wire length^*)for a fast (magnetic) tripping:

Fig. 22-7 Test circuit

0.75mm²

24m

23m

13m

3m

1.0mm²

33m

29m

17m

6m

1.5mm²

44m

39m

27m

8m

2.5mm²

70m

58m

47m

13m

5m

C-2A

C-3A

C-4A

C-6A

C-8A

C-10A

MCB

Power Supply

Load

+

AC

Wire length

S1

1m

3m

4m

-

DC

1m

2m

3m

S1... Fault simulation switch

B-6A

18m

3m

21m

4m

33m

6m

56m

11m

B-10A

*) Don’t forget to consider twice the distance to the load (or cable length) when calculating the total wire length (+ and – wire).

22.7. SERIES OPERATION

Power supplies of the same type can be connected in series for higher output

Unit A

AC

voltages. It is possible to connect as many units in series as needed, providing

+

-

the sum of the output voltage does not exceed 150Vdc. Voltages with a

potential above 60Vdc are not SELV any more and can be dangerous. Such

voltages must be installed with a protection against touching.

DC

+

Load

-

Unit B

Avoid return voltage (e.g. from a decelerating motor or battery) which is

applied to the output terminals.

AC

+

-

Keep an installation clearance of 15mm (left / right) between two power

supplies and avoid installing the power supplies on top of each other. Do not

use power supplies in series in mounting orientations other than the standard

mounting orientation (input terminals on the bottom of the unit).

DC

Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

24/27

www.pulspower.com Phone +49 89 9278 0 Germany

QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

22.8. PARALLEL USE TO INCREASE OUTPUT POWER

Power supplies from the same series (Q-Series) can be paralleled to increase

the output power. The output voltage shall be adjusted to the same value

( 100mV) or the units can be left with the factory settings.

Unit A

AC

+

-

If more than three units are connected in parallel, a fuse or circuit breaker

with a rating of 25A is required on each output. Alternatively, a diode or

redundancy module can also be utilized.

DC

+

Load

-

Unit B

AC

Keep an installation clearance of 15mm (left / right) between two power

supplies and avoid installing the power supplies on top of each other. Do

not use power supplies in parallel in mounting orientations other than the

standard mounting orientation (input terminals on the bottom of the unit)

+

-

DC

or in any other condition where a derating of the output current is required (e.g. altitude, above 60°C, …).

Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.

22.9. PARALLEL USE FOR REDUNDANCY

Power supplies can be paralleled for redundancy to gain higher system availability. Redundant systems require a

certain amount of extra power to support the load in case one power supply unit fails. The simplest way is to put two

power supplies in parallel. This is called a 1+1 redundancy. In case one power supply unit fails, the other one is

automatically able to support the load current without any interruption. Redundant systems for a higher power

demand are usually built in a N+1 method. E.g. five power supplies, each rated for 20A are paralleled to build a 80A

redundant system. For N+1 redundancy the same restrictions apply as for increasing the output power, see also

chapter 22.8.

Please note: This simple way to build a redundant system does not cover failures such as an internal short circuit in

the secondary side of the power supply. In such a case, the defective unit becomes a load for the other power supplies

and the output voltage can not be maintained any more. This can be avoided by utilizing redundancy modules, which

have decoupling devices (diodes or MOSFETs) included. Further information and wiring configurations can be found in

chapter 21.4.

Recommendations for building redundant power systems:

a) Use separate input fuses for each power supply. A separate source for each supply when possible increases the

reliability of the redundant system.

b) Monitor the individual power supply units. Therefore, use the DC-OK relay contact of the QT20 power supply.

c)

It is desirable to set the output voltages of all units to the same value ( 100mV) or leave it at the factory setting.

22.10.INDUCTIVE AND CAPACITIVE LOADS

The unit is designed to supply any kind of loads, including capacitive and inductive loads.

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

25/27

www.pulspower.com Phone +49 89 9278 0 Germany

QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

22.11.BACK-FEEDING LOADS

Loads such as decelerating motors and inductors can feed voltage back to the power supply. This feature is also called

return voltage immunity or resistance against Back- E.M.F. (Electro Magnetic Force).

This power supply is resistant and does not show malfunctioning when a load feeds back voltage to the power supply.

It does not matter whether the power supply is on or off.

The maximum allowed feed-back-voltage is 34Vdc. The absorbing energy can be calculated according to the built-in

output capacitor which is specified in chapter 6.

22.12.USE IN A TIGHTLY SEALED ENCLOSURE

When the power supply is installed in a tightly sealed enclosure, the temperature inside the enclosure will be higher

than outside. In such situations, the inside temperature defines the ambient temperature for the power supply.

The following measurement results can be used as a reference to estimate the temperature rise inside the enclosure.

The power supply is placed in the middle of the box, no other heat producing items are inside the box

Enclosure:

Load:

Input:

Rittal Typ IP66 Box PK 9519 100, plastic, 180x180x165mm

24V, 16A; (=80%) load is placed outside the box

3x 400Vac

Temperature inside enclosure:

55.9°C (in the middle of the right side of the power supply with a distance of 2cm)

Temperature outside enclosure: 24.9°C

Temperature rise:

31.0K

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

26/27

www.pulspower.com Phone +49 89 9278 0 Germany

QT20.241, QT20.241-C1

Q-Series

24V, 20A, THREE PHASE INPUT

22.13.MOUNTING ORIENTATIONS

Mounting orientations other than all terminals on the bottom require a reduction in continuous output power or a

limitation in the maximum allowed ambient temperature. The amount of reduction influences the lifetime expectancy

of the power supply. Therefore, two different derating curves for continuous operation can be found below:

Curve A1

Curve A2

Recommended output current.

Max allowed output current (results in approximately half the lifetime expectancy of A1).

Fig. 22-8

Output Current

Mounting

Orientation A

(Standard

OUTPUT

20A

16

12

8

A1

orientation)

Power

Supply

4

0

Ambient Temperature

INPUT

10

20

30

40

50

60°C

Fig. 22-9

Mounting

Orientation B

(Upside down)

Output Current

T U I N P

20A

16

12

8

A2

A1

y

u p S p l

r e w P o

4

0

U P T O U T

Ambient Temperature

20 30 40 50

10

60°C

Fig. 22-10

Output Current

Mounting

Orientation C

(Table-top

20A

16

12

8

A2

A1

mounting)

4

0

Ambient Temperature

20 30 40 50

10

Fig. 22-11

Mounting

Orientation D

(Horizontal cw)

Output Current

20A

16

12

8

A2

A1

4

0

Ambient Temperature

20 30 40 50

10

Fig. 22-12

Mounting

Orientation E

(Horizontal ccw)

Output Current

20A

16

12

8

A2

A1

4

0

Ambient Temperature

20 30 40 50

10

Oct. 2016 / Rev. 2.0 DS-QT20.241-EN

All parameters are specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after a 5 minutes run-in

time unless otherwise noted.

27/27

www.pulspower.com Phone +49 89 9278 0 Germany

厂商	型号	描述	页数
PULS	QT20.241	[ THREE PHASE INPUT ]	27 页
QT	QT202IT.A1A2	[ Single Color LED, High Efficiency Red, Red Clear, T-1, 3mm, ]	2 页
QT	QT202IT.A1R0	[ Single Color LED, High Efficiency Red, Red Clear, T-1, 3mm, ]	2 页
QT	QT202IT.A2A1	[ Single Color LED, High Efficiency Red, Red Clear, T-1, 3mm, ]	2 页
QT	QT202IT.A2A2	[ Single Color LED, High Efficiency Red, Red Clear, T-1, 3mm, ]	2 页
QT	QT202IT.A2R1	[ Single Color LED, High Efficiency Red, Red Clear, T-1, 3mm, ]	2 页
QT	QT202IT.A2R2	[ Single Color LED, High Efficiency Red, Red Clear, T-1, 3mm, ]	2 页
QT	QT202IT.A3A2	[ Single Color LED, High Efficiency Red, Red Clear, T-1, 3mm, ]	2 页
QT	QT202IT.A3R1	[ Single Color LED, High Efficiency Red, Red Clear, T-1, 3mm, ]	2 页
QT	QT202IT.B4A0	[ Single Color LED, High Efficiency Red, Red Clear, T-1, 3mm, ]	2 页