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Case A:
UMC output relay does not open. The motor keeps running without interruption.
Parameter Description
Parameter Explanation
Dip Duration If the voltage Dip is longer than this time a 'Dip Duration' error is triggered.
Dip Autorestart Window
If the voltage recovers within this time the motor is not switched off - i.e. the UMC
output relay is switched on.
Dip Autorestart Delay
The time delay until the motor is restarted after the end of a voltage Dip.
This is done only if the parameter 'Dip Autorestart Enable' is set.
Dip Enable Dip function is enabled.
Dip Autorestart Enable Activate the automatic restart.
Dip Level Voltage level indicating the begin of a voltage Dip
Dip Restart Level Voltage level indicating the end of a voltage dip.
Depending on the duration of a voltage Dip and the parameters above different reactions can be configured.
The following four diagrams show different cases.
• Case a: short low voltage situation. The motor keeps running.
• Case b: longer low voltage situation with motor stop. The motor is automatically re-started after a delay.
• Case c: long low voltage situation triggering an error
• Case d: two Dips within a short period of time
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