8-4

( 3 ) Undervoltage

NOTE 1 – When the DC bus capacitor is discharged by a system power failure and the control

power of the Drive is reduced, automatic restart after momentary power outage may take

place. (Refer to Funtion Code 14 setting.)

L U
No
No
Has the power
circuit been
subjected to
component failure
or poor power
connection?
No
Yes
Does another load
exist which
requires a large
starting current
within the same
power system?
Yes Investigate the
power system and
correct to satisfy
the system
specification.
No
No
Is the power
transformer rated
at the correct KVA?
No
Reset and
continue
operation.
Yes
Replace the
defective compo-
nent or repair the
poor connection.
Yes
Yes
Yes
Possible Drive
control circuit or
noise related
malfunction.
Contact GE Fuji
Electric.
Does the condition
occur when the
circuit breaker
and/or electro-
magnetic
contactor are
turned "ON"?
Is the power supply
voltage within the
range of the
specified value?
Has power failure
(including
momentary power
failure) taken place?