Voltage window monitoring 2x1 c/o (SPDT) contact iON-delayed Awith latching f
Open-circuit principle h
The voltage to be monitored (measured value) is applied to terminals B-C. The control supply voltage applied to terminals
A1-A2 is displayed by the glowing green LED.
If the measured value exceeds the threshold valuemax (>U) or drops below the threshold valuemin (<U), the tripping delay TV
starts and the red LED glows (overvoltage), or flashes W(undervoltage) respectively.
Timing of TV is displayed by the flashing Wgreen LED.
When TV is complete and the measured value still exceeds the threshold valuemax minus the fixed hysteresis (5 %) or is still
below the threshold valuemin plus the fixed hysteresis (5 %), the output relay 1115-1216/1418 (>U), or 2125-2226/2428 (<U)
respectively, energizes and the yellow LED (relay energized) flashes Z.
If the measured value decreases below the threshold valuemax minus the fixed hysteresis (5 %) or exceeds the threshold
valuemin plus the fixed hysteresis (5 %), the red LED turns off. The output relay 1115-1216/1418 (>U), or 2125-2226/2428 (<U)
respectively, remains energized (latching function).
If control supply voltage is interrupted (reset), the output relay 1115-1216/1418 (>U), or 2125-2226/2428 (<U) respectively, de-
energizes and the yellow and green LEDs turn off.
Closed-circuit principle g
The voltage to be monitored (measured value) is applied to terminals B-C. When control supply voltage is applied to
terminals A1-A2, the output relays energize and the green and yellow LED (relays energized) glow.
If the measured value exceeds the threshold valuemax (>U) or drops below the threshold valuemin (<U), the tripping delay TV
starts and the red LED glows (overvoltage), or flashes W(undervoltage) respectively.
Timing of TV is displayed by the flashing Wgreen LED.
When TV is complete and the measured value still exceeds the threshold valuemax minus the fixed hysteresis (5 %) or is still
below the threshold valuemin plus the fixed hysteresis (5 %), the output relay 1115-1216/1418 (>U), or 2125-2226/2428 (<U)
respectively, de-energizes and the yellow LED (relays energized) flashes Y.
If the measured value decreases below the threshold valuemax minus the fixed hysteresis (5 %) or exceeds the threshold
valuemin plus the fixed hysteresis (5 %), the red LED turns off. The output relay 1115-1216/1418 (>U), or 2125-2226/2428 (<U)
respectively, remains de-energized (latching function).
If control supply voltage is interrupted (reset), the yellow and green LEDs turn off. The output relays energize again when
control supply voltage is re-applied.
A1-A2
Reset
Thresholdmax
Hysteresis
Measured value
< TV
< TV
TV
TV
Hysteresis
Thresholdmin
Open-circuit principle
open
11-14 (15-18)
11-12 (15-16)
>U:
21-24 (25-28)
21-22 (25-26)
<U:
green LED
red LED
yellow LED
closed
Closed-circuit principle
11-14 (15-18)
>U:
11-12 (15-16)
21-24 (25-28)
<U:
21-22 (25-26)
green LED
red LED
yellow LED
10 - Voltage monitoring relay CM-EFS.2 | Data sheet