5-140
5-6-9 Low voltage protection
When the voltage of the main circuit’s input power is lower than the setting value of Cn051 (low
voltage protection level) and exceeded the time of Cn052 (low voltage protection alarm delay time),
the AL.001 alarm (when the input voltage of the 200V driver is lower than 170V, and the input voltage
of the 400V driver is lower than 340V, without counting the time, the alarm will be generated directly).
Reasons for the occurrence of the low voltage alarm (AL.001) are as follows:
1. Input voltage of the main circuit is lower than the specifications, input power error, no input
power for the main circuit.
2. Sudden power outage.
3. Power voltage decreased during operation.
Cn051 low voltage protection level
Initial value Unit Setting range Take effect
RS-485
address
200V：190
400V: 380
Volt
200V：170 ~ 190
400V: 340 ~ 380
Takes effect
after
confirmation
0036H
Setting description: The low voltage protection alarm is triggered when the voltage of the driver’s input
power is less than Cn051 and delayed for the time set in Cn052. But if the voltage is
lower than 170V, low voltage protection will be executed directly regardless of what
time is set for Cn052.
Cn052 low voltage protection alarm delay time
Initial value Unit Setting range Take effect
RS-485
address
4 250ms 0 ~ 100
Takes effect
after
confirmation
0037H
Setting description: The low voltage protection alarm is triggered when the voltage of the driver’s input
power is less than Cn051 and delayed for the time set in Cn052. But if the voltage
is lower than 170V, low voltage protection will be executed directly regardless of
what time is set for Cn052.
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