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(2) Overvoltage(OU)
Consider using DC in-
jection brake.
Reduce regenerating
load.
Reduce moment of in-
ertia.
Prolong decelerating
time.
DC injection brake
used?
Can decelerating time be
prolonged?
Prolong accelerating
time.
Can accelerating time be
prolonged?
Occurs on completion
of steep acceleration?
Can the moment of inertia of load be reduced?
Review braking method. Contact GE Fuji .
Can regenerating load be reduced?
Main circuit DC voltage exceeds protection
level?
Does OU activate when load is removed
suddenly.
Power supply voltage within specified value?
Overvoltage during
acceleration
OU1
Overvoltage dur
ing
deceleration OU2
Overvoltage while
running at constant
speed OU3
* Fix supply voltage to
within upper limit of
specifications.
* If caused by momen-
tary voltage surge
from power supply,
consider installing a
power-factor correct-
ing DC reactor.
Faulty drive or error
because of noise.
Contact GE Fuji.
* Eliminate sudden
change of load.
* Consider increasing
drive capacity.
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