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5
TROUBLESHOOTING
Check first when you have some troubles
5.5.3 Motor generates heat abnormally
Is the fan for the motor is running? (Check for dust accumulated.)
Check that the load is not too heavy. Lighten the load.
Are the inverter output voltages (U, V, W) balanced?
Check that the Pr. 0 Torque boost setting is correct.
Was the motor type set? Check the setting of Pr. 71 Applied motor.
When using any other manufacturer's motor, perform offline auto tuning. (Refer to page 105.)
5.5.4 Motor rotates in opposite direction
Check that the phase sequence of output terminals U, V and W is correct.
Check that the start signals (forward rotation, reverse rotation) are connected properly. (Refer to page 20)
Check that the Pr. 40 RUN key rotation direction selection setting is correct. (Refer to page 237).
5.5.5 Speed greatly differs from the setting
Check that the frequency setting signal is correct. (Measure the input signal level.)
Check that the Pr. 1, Pr. 2, Pr. 19, Pr. 245, calibration parameter Pr. 125, Pr. 126, C2 to C7 settings are correct.
Check that the input signal lines are not affected by external noise. (use shielded cables)
Check that the load is not too heavy.
Check that the Pr. 31 to Pr. 36 (frequency jump) settings are correct.
5.5.6 Acceleration/deceleration is not smooth
Check that the acceleration and deceleration time settings are not too short.
Check that the load is not too heavy.
Check that the torque boost (Pr. 0, Pr. 46) setting is not too large to activate the stall function under V/F control.
5.5.7 Motor current is large
Check that the load is not too heavy.
Check that the Pr. 0 Torque boost setting is correct.
Check that the Pr. 3 Base frequency setting is correct.
Check that the Pr. 19 Base frequency voltage setting is correct
Check that the Pr. 14 Load pattern selection setting is correct.
5.5.8 Speed does not increase
Check that the Pr. 1 Maximum frequency setting is correct. (If you want to run the motor at 120Hz or more, set Pr. 18
High speed maximum frequency. (Refer to page 83).
Check that the load is not too heavy. (In agitators, etc., load may become heavier in winter.)
Check that the torque boost (Pr. 0, Pr. 46) setting is not too large to activate the stall function under V/F control.
Check that the brake resistor is not connected to terminals P/+ and P1, or P1 and PR accidentally.