Chapter 5 Trouble shooting and maintenance
5-6
5.2 General functional troubleshooting
Status Checking
point
Corrective
Action
Is power applied to L1, L2, and L3(N)
terminals (is the charging indicator lit)?
‧
Is the power applied?
‧
Turn the power OFF and then ON
again.
‧
Make sure the input line voltage is
correct.
‧
Make sure all terminal screws are
secured firmly.
Are there voltage outputs on T1, T2, and
T3 terminals?
Turn the power OFF and then ON
again.
Is the motor mechanically overloaded?
‧
Reduce the load to improve
performance.
Are there any problems with the inverter?
Has the forward or reverse run
commands been issued?
‧
See error descriptions to check
wiring and correct if necessary.
Is there an analog input signal?
‧
Is analog frequency input signal
wiring correct?
‧
Is frequency input voltage correct?
Motor does not
run
Is operation mode setting correct?
‧
Configure operations through the
digital panel
Are wiring for output terminals T1, T2,
and T3 correct?
‧
Wiring must match U, V, and W
terminals of the motor.
Motor rotates in
the wrong
direction
Are wiring for forward and reverse
signals correct?
‧
Check wiring and correct if
necessary.
Are wiring for output terminals T1, T2,
and T3 correct?
‧
Check wiring and correct if
necessary.
Is the setting of frequency command
source correct?
‧
Check the operation mode setting
on the keypad.
Motor rotates
in the wrong
direction
The motor
speed can not
vary
Is the load too large?
‧
Reduce the applied load.
Is the setting of operation mode correct?
‧
Confirm the motor’s specifications.
Is the load too large?
‧
Confirm the gear ratio.
Motor running
at too high or
too low speeds.
Are specifications of the motor (poles,
voltage…) correct?
‧
Confirm the highest output
frequency.
Is the gear ratio correct?
‧
Reduce the load.
Is the setting of the highest output
frequency correct?
‧
Minimize the variation of the load.
‧
Increase capacities of the inverter
and the motor.
Motor speed is
incorrect or
erratic
Is the load too large?
‧
Add an AC reactor at the power
input side if using single-phase
power.
‧
Check wiring if using three-phase
power.