Hitachi WJ Series

Chapter 9 Inverter Functions
9-9-11
Operations of "Restart mode selection after instantaneous power failure/undervoltage error [b001]"
■ Trip ([b001] = 00)
 When an instantaneous power failure or undervoltage error is detected, the inverter output is
shut off, and the motor runs free. If the power is restored within [b002], an "Undervoltage error
[E09]" occurs and an "Alarm [AL]" will be output.
■ 0 Hz start ([b001] = 01)
 Detection of an instantaneous power failure or undervoltage error shuts off the inverter output,
and the motor runs free. After the power returns, the inverter restarts from 0 Hz after the retry
wait time set in [b003]. At this time, no "Alarm [AL]" is output.
Free running
Inverter output
Motor speed
[AL] Output
P-N voltage
Undervoltage level
Undervoltage detection
Power
[UV] Output
"Undervoltage error [E09]" occurs
Free running
Inverter output
Motor speed
P-N voltage
Undervoltage level
Undervoltage detection
Power
Retry wait
time
0 Hz restart
Undervoltage time
Instantaneous power
failure/undervoltage
allowed time
[UV] Output
A