7-1
7 Troubleshooting
FVR-C11S-EN
7
7 Troubleshooting
1) Overcurrent (OC)
7-1 In case of
tripping
In the event the inverter tripping, diagnose by the help of the alarm dis-
play as shown below.
Overcurrent
during
acceleration
OC1
Overcurrent
during
deceleration
OC2
Overcurrent
while running at
constant speed
OC3
Are the motor connecting terminal (U,V,W)
short-circuited or grounded?
Yes
Remove
short-circuit
or ground.
No
No
No
Load excessive?
Yes
Reduce load
or expand
inverter
capacity.
No
No
No
No
Can torque
boost amount be
reduced?
No
Torque
boost amount
correct?
Deceleration
time setting
too short com-
pared
with load?
No
Faulty invert-
er or error
’because of
noise.
Contact
Fuji Electric.
Yes
Yes
Yes
Has load changed
suddenly?
No
Reduce
torque boost
amount.
Acceleration
time setting too
short compared
with load?
No
Yes
Prolong
time setting.
Yes
Can the
acceleration
time setting be
prolonged?
Can the
deceleration
time setting be
prolonged?
Yes
Prolong
time setting.
No
No
Reduce load or
expand inverter
capacity.
Braking method
needs investiga-
tion. Consult with
Fuji Electric.
Suppress load
fluctuation or
expand inverter
capacity.
Yes
