6-22 MHT258a (Engl.)
6.3.7 Undervoltage
Selects the operation when undervoltage at main circuit input is detected.
System parameter 84, 85
Para. Name Setting range Initial value Change
84 Operation at undervoltage 0: Rapid deceleration to a stop
1: Free-run
0 Power
85 Alarm detection at undervoltage 0: No detection
1: Detects
1 Power
■ Operation at undervoltage (system para. 84)
Specifies the motor operation when undervoltage has been detected while the run command [RUN] is on.
Setting range Operation
0: Rapid decel. to a stop The motor rapidly decelerates to a stop (within amplifier’s highest capacity).
1: Free-run The motor decelerates (or accelerates) with free-run condition according to the load torque.
■ Alarm detection at undervoltage (system para. 85)
Specifies the alarm detection operation when undervoltage has been detected while the run command [RUN] is on.
Setting range Operation
0: No detection Alarm is not detected.
1: Detects Undervoltage alarm was detected.
If “0” has been set, the motor stops according to the preset operation to be made at undervoltage, and alarm detection will not be output.
Remark: If the power voltage decrease (undervoltage) due to momentary power failure is detected, the motor decelerates by system para.
84 setting. Due to regenerative power generated by the motor during deceleration, voltage level may exceed undervoltage level.
In this case, the motor starts deceleration at the undervoltage level. After that, the motor will accelerate again after alarm detection
of undervoltage is released.
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