ABB eVM1 Installation And Service Instructions Manual page 53

14.5.5.7.1 SW configuration
Fig. 39
When UnderVoltage function is enabled (ticked), UnderVoltage Function Settings is enabled and
the function operation mode can be set:
Instantaneous: the function operates with no intentional delay when the UnderVoltage condition is
detected;
Delayed: ticked by default. The function is started when the UnderVoltage condition is detected
(voltage on DI1 falls below 0.70 of the dip-switch value setting). After the protection has entered
the Detected status and the preset operating time (Delay) has elapsed, the opening signal is
generated. An Anomaly alarm is issued and the No Anomaly LED on the CB HMI goes ON.
The UV function will come back in passive status and Reset if the voltage on DI1 exceeds 0.85 of
the dip-switch value setting.
Under
CB Close
Voltage
not allowerd
Condition
CB Open CB Close
not allowerd allowerd
CB Open
allowerd
Detected
Reset
Voltage [V]
0.35 Vn 0.7 Vn 0.85 Vn Vn
Fig. 40
The UnderVoltage Open and Close not allowed are in accordance with UnderVoltage according to
IEC 60694.5.8.4.
CB blocked in open position: CB closing is not allowed after UV opening; the UV condition must
be reset before closing is performed.
For 'Instantaneous' and 'Delayed' with 0s of operating time Closing Allowed option is not
available.
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