Overcurrent; Overvoltage - GE Fuji Electric AF-300 MICRO-SAVER II Instructions Manual

TROUBLESHOOTING
If the function of the Drive is lost by a failure or if an abnormal condition has occurred, refer to the following diagnosis
for its probable cause.
If the cause does not fall under the following explanation, or if the Drive is damaged, please contact GE Fuji Technical
Services for assistance.

( 1 ) Overcurrent

Overcurrent Overcurrent
during during
acceleration deceleration
O C 1 O C 2
Is motor circuit (U,V, W) of motor shorted or grounded?
No No
Reduce the
torque boost
setting Is the load too large?
No
No
Yes
Is the
Is the torque
deceleration
Can the torque
No
boost setting
time setting
boost setting
correct?
too short for
be reduced?
the load?
Yes
Yes
No
There is a
possibility of Is the
Drive failure acceleration
No
time setting too
or a motor
short for the
noise problem.
Contact GE Fuji load?
Electric.
Can the
Yes
deceleration
time be
increased?
Can the
Yes acceleration
No
Increase the
time be
setting time.
increased?
No Review the system
application.
Reduce the
Contact GE Fuji
load fluctua-
Electric.
tion or use a
Drive with
higher
capacity.
8-2
Overcurrent at
constant speed
O C 3
Repair
Yes
short-circuit
and/or
No
grounding.
Yes
Reduce the
load fluctua-
No
tion or use a
There is the
Drive with
possibility of
Does the load
higher
No No
failure in the
change
capacity.
Drive or a
suddenly?
noise problem.
Yes
Contact GE
Fuji Electric
Reduce the
load
fluctuation
or use a Drive
with higher
capacity.
Yes
Increase the
setting time.

( 2 ) Overvoltage

Is the power supply voltage within the specified limits?
Will fault take place when the load is removed suddenly?
No
Was DC bus voltage above alarm level when alarm occurred?
Possible Drive
failure or
Yes
malfunction due
to electrical
noise. Contact
GE Fuji Electric.
No
Does action take place after
rapid acceleration is completed?
Yes
Can the acceleration time be
increased?
No
Can the load inertia be decreased?
Is a braking resistor installed and activated?
Review the control and system application again. Contact GE Fuji
Electric.
O U
The power
supply
No
voltage
should be
corrected.
Yes
Yes
No
Yes
Yes Increase
Can the deceleration time be
the timed
increased?
setting
No
Yes
Yes
Decrease until the
failure does not
No occur.
No
Investigate braking
resistor for correct
Yes
connection rating and
control settings.
8-3