Page 342 - Womens Pavilion

Oil-Less Claw Medical Vacuum

Appendix B: Variable Speed Drive Inverter

B.3.5 Trouble Shooting Checklist (continued)

Motor generates abnormal noise
1) No carrier frequency noises (metallic noises) are generated.
• Soft-PWM control to change the motor tone into an unoff ending complex tone is
factory-set to valid by the PWM frequency selection (Pr.72). Adjust PWM frequency
selection (Pr.72) to change the motor tone. (When operating the inverter with the
carrier frequency of 3kHz or more set in Pr. 72, the carrier frequency will automatically
decrease if the output current of the inverter exceeds the value in parenthesis of the
rated output current. This may cause the motor noise to increase. But it is not a fault.)

2) Check for any mechanical looseness.

3) Contact the motor manufacturer.
Motor generates heat abnormally

1) Is the fan for the motor is running? (Check for accumulated dust.)

2) Check that the load is not too heavy. Lighten the load.
3) Check that the inverter output voltages (U, V, W) balanced.

4) Check that the torque boost setting (Pr.0) is correct.

Motor rotates in opposite direction
1) Check that the phase sequence of output terminals U, V and W is correct.

2) Check that the start signals (forward rotation, reverse rotation) are connected properly.

Speed greatly diff ers from the setting

1) Check that the frequency setting signal is correct. (Measure the input signal level.)
2) Check that the Pr. 1, Pr. 2, Calibration parameter C2 to C7 settings are correct.

3) Check that the input signal lines are not aff ected by external noise. (Use shielded cables)
4) Check that the load is not too heavy.

5) Check that the Pr. 31 to Pr. 36 (frequency jump) settings are correct.

Acceleration/deceleration is not smooth
1) Check that the acceleration and deceleration time settings are not too short.

2) Check that the load is not too heavy.

B-23 4107 9000 95.04