5.3 Description of Function Codes 5.3.1 F codes (Fundamental functions)
Restart mode after momentary power failure (Basic operation: Without auto search setting)
When inverter detected that DC link bus voltage becomes at or drops below undervoltage level while operating, it
is judged as a momentary power failure. When load is light and momentary power failure is very short, momentary
power failure may not be detected and motor operation might be continued because DC link bus voltage does not
drop so much.
When inverter judges the state as momentary power failure, returns to momentary power failure restart mode and
prepares for restart. After power is auto-restarted, the inverter becomes at inverter ready to run state after elapse
of initial charging time. At momentary power failure, power of external circuit (relay circuit etc.), which controls the
inverter, decreases as well, and run command may be turned off. Therefore, when the inverter becomes at inverter
ready to run state, wait 2 seconds for input of run command. When input of run command is confirmed within 2
seconds, initiate restarting according to F14 (mode selection). When there is no input of run command at run
command input waiting state, momentary power failure restart mode will be released and start from normal starting
frequency. Therefore, input run command within 2 seconds after auto-restarting or hold run command by off-delay
timer or mechanical latch relay.
In case of F02=0 (run command from keypad and rotation direction command determined by terminal), it operates
in the same way as above. For rotation direction fixed mode (F02 = 2, 3), run command is held within the inverter,
therefore, it restarts immediately at inverter ready to run state.
Preparation time:
approx. 0.3 to 0.6 s
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