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8-10
( 10 ) Motor will run but speed will not change.
The electric
motor will
run but the
speed will
not change.
Do the set
frequencies of
each selection
step change?
Is the setting of the
acceleration and
deceleration time
excessively long?
Is the wiring of
multistep frequency
selection terminals
X1, X2, X3 and X4
correct?
Change the setting
to the time suitable
for the load.
Yes
No
No
Yes
No
Correct wiring.
Change the set
frequency.
No
No
No
Will frequency setting signal
change (0-10V or 4-20mA)
Will speed change by
pressing key?
Keypad
Analog
Change or check the setting.
Yes
Yes
Yes
No
Motor speed change is very small under these conditions:
① Wrong setting of F_34 bias frequency, F_35 gain for frequency setting.
➁ If using terminal 12, and C1 check polarity inputs to insure they are correct and do not offset.
③ During torque limiting or current limiting with excessive load.
Yes
Yes
No
Multistep
Are the high limiter (F_36),
and low frequency limiter
(F_37) operating?
Is max frequency (F_03)
set too low?
Is the wiring between
Terminals 13, 12, 11,
and C1 correct?
Yes
Replace the frequency
setter, process signal,
or check for ground &
reference circuit.
Determine which
frequency method is
active:
• Keypad (F_ 01) = 0
• Analog (F_ 01) = 1
• Multistep (F_21~F_27)
Possible Drive failure or
malfunction due to
electrical noise. Contact
GE Fuji Electric.