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7-9
7 Troubleshooting
FVR-C11S-EN
7
2) When motor rotates but the speed does not change.
Motor rotates but speed
does not change.
Change the
setting.
Yes
Maximum frequency set-
ting too low?
No
Yes
Upper/lower frequency
limiter activating?
No
Which frequency
setting method
is in use:
built-in POT (VR),
keypad panel,
analog signal,
or multistep
frequency?
Built-in POT (VR)
Does speed change when
freq. setting POT(VR)
turned
clockwise or counter
clockwise?
Yes
No
Yes
No
Keypad panel operation
Does the speed change
when UP or DOWN key
depressed?
No
Analog signal
Can the frequency
setting signal
(0 to +10V, 4 to 20mA)
be changed?
Yes
Multistep
frequency
No
External wiring
connections between
control terminals
X1,X2,X3 - P24/CM
connected correctly?
No
Remedy wiring error.
No
External wiring
connections between
control terminals
13,12,C1 - 11 correct?
Yes
Yes
Frequencies for each
multistep selecting
frequency different?
No
Change the setting
frequency.
Yes
Setting of
acceleration/
deceleration time
excessively long?
No
Probably faulty
inverter or error
because of noise, etc.
Contact Fuji Electric.
Replace faulty
frequency setting
POT(VR) or signal
converter as
appropriate.
Yes
Change setting to
correct acceleration/
deceleration time for load.