5.2 Troubleshooting
PROTECTIVE FUNCTIONS
152
5.2 Troubleshooting
Note: Check the corresponding areas. If the cause is still unknown, it is
recommended to initialize the parameters (return to factory settings), reset
the required parameter values, and check again.
5.2.1 Motor remains stopped
1) Check the main circuit
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Check that a proper power supply voltage is applied (POWER lamp is lit).
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Check that the motor is connected properly.
2) Check the input signals
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Check that the start signal is input.
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Check that both the forward and reverse rotation start signals are not input.
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Check that the frequency setting signal is not zero.
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Check that the output stop signal (MRS) or reset signal (RES) is not on.
3) Check the parameter settings
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Check that the reverse rotation prevention (Pr. 78) is not selected.
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Check that the operation mode (Pr. 79) setting is correct.
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Check that the starting frequency (Pr. 13) setting is not greater than the
running frequency.
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Check that various operational functions (such as three-speed operation),
especially the maximum frequency (Pr. 1), are not zero.
4) Check the load
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Check that the load is not too heavy.
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Check that the shaft is not locked.
5) Others
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Check that the ALARM lamp is off.
5.2.2 Motor rotates in opposite direction
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Check that the phase sequence of output terminals U, V and W is correct.
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Check that the start signals (forward rotation, reverse rotation) are connected
properly.
5.2.3 Speed greatly differs from the setting
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Check that the frequency setting signal is correct. (Measure the input signal
level.)
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Check that the following parameter settings are correct (Pr. 1, Pr. 2, Pr. 19,
Pr. 245).
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Check that the input signal lines are not affected by external noise. (Use shielded
cables)
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Check that the load is not too heavy.
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