7 Troubleshooting
7-4
FVR-C11S-EN
7
5) External alarm input (OH2)
6) Inverter overload (OLU) or motor overload
(OL)
OH2
Signal from external
device connected
between control circuit
terminals
THR - P24/CM?
No
Connect alarm signal
contact. Short-circuit
between terminals
THR - P24/CM if no
signal is input.
Yes
Is the alarm function of
the external device
operating correctly?
No
Probably faulty
inverter or error be-
cause of noise.
Contact Fuji Electric.
Yes
Remove the cause of
alarm function
activation.
OLU
OL
Do characteris-
tics of electronic
thermal O/L relay
and those of mo-
tor overload
match?
No
Connect thermal
O/L relay
externally.
Yes
Is electronic ther-
mal O/L relay set-
ting correct?
No
Set to correct
level.
Yes
Load excessive?
No
Probably faulty
inverter or error
because of
noise, etc.
Contact
Fuji Electric.
Yes
Reduce load or
increase inverter
capacity
