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Chapter 8 Precautions for Maintenance and Inspection
c: Check the main circuit and control circuit.
d: Check that the output stop signal or reset signal is not on.
e: Check that P104 Reverse rotation prevention selection is not
selected.
f: Check that frequency setting of each running frequency (such as
multi-speed operation) are not zero.
g:Check that especially the P105 Maximum frequency setting in not
zero.
h: Check that the P400 Jog frequency setting is not lower than the
P202 starting frequency setting.
i: Check that the load is not too heavy.
(3) Motor generates heat abnormally
Causes and corrective actions:
a: Check that the load is not too heavy. Lighten the load.
b: Is the fan for the motor is running ? (check for accumulated dust.)
c: Check that the P208 Torque boost setting is correct.
d: Was the motor type set? Check the setting of P209 to P219
applied motor.
e: When using any other manufacturer’s motor ,perform offline auto
tuning.
(4) Motor generates abnormal noise
Causes and corrective actions:
a: No carrier frequency noises (metallic noises) are generated.
Check the setting of P115 applied motor.
b: Check for any mechanical looseness.
c: Contact the motor manufacturer.
(5) Motor rotates in opposite direction
Causes and corrective actions:
a: Check that the phase sequence of output terminals U,V and W is
correct.
b: Check that the start signals (forward rotation, reverse rotation)are
connected properly.