65165E_Alpha IPM Alarms

3.  TROUBLESHOOTING
AND ACTION

TROUBLESHOOTING

B-65165E/02

3.2 SERVO AMPLIFIER MODULE

3.2.1 Abnormal Current Alarms (8, 9, A, b, C, d, and E in the LED display)

(1) Make sure that the following parameters are set to the standard values. If they are not, abnormal current control is performed.

(2) Remove the power line wires from the amplifier terminals, and release an emergency stop state.
If an abnormal current alarm is issued, the servo amplifier module needs to be replaced.

If not, go to (3).

(3) Check for insulation between PE and each of the removedpower wires U, V, and W. If insulation is perfect, go to (4). If not, disconnect the power wires from the motor connector. Then check for insulation between PE and each of the U, V, and W terminals on themotor.
If there is a short-circuit between PE and U, V, or W of the motor, replace the motor.
If insulation is perfect, replace the power wires.

(4) Connect the power wires. Attach the check board (A06B-6071- K290) to connector JX5 to measure the waveform of the actual current (IR and IS) in the servo amplifier module. Accelerate or decelerate the motor, and measure the actual current (IR and IS)of the amplifier.
If an abnormal current alarm occurs right after an emergency stop state is released, go to (5).
Release an emergency stop state, and start the motor.
Check whether the waveform of the actual current (IR and IS) is a normal sine wave.

If normal, go to (5).
If not, replace the amplifier.

(5) Check whether there is noise on the actual current (IR and IS) wave form.

If there is no noise, replace the amplifier.
 If there is noise, use a shielding wire, and ground the shielding, or take other counter measures as required.

(6) If still there is noise, a probable cause is a defective command cable or a hardware failure in the CNC.

3.2.2 IPM Alarms (8, 9, A, b, C, d, and E in the LED display;note these codes are displayed simultaneously with a period.)

(1) Wait for about 10 minutes. Then release the emergency stop state. If an IPM alarm still occurs, go to (2).
If the cause is IPM overheat, the IPM alarm will not recur. IPM over heat can occur if the ambient temperature is high or themotor is over loaded. Check the operating condition.

(2) Remove the power wires from the amplifier terminals, and release an emergency stop state.
If the IPM alarm does not recur, go to (3).

If the IPM alarm recurs,the probable cause is the operation of the IPM protective function (for over current or power failure). Replace the amplifier and see.
If the IPM does not recur, go to (3).

(3) Check for insulation between PE and each of the removed power wires U, V, and W. If insulation is perfect, go to (4). If not, disconnect the power wires from the motor connector. Then check for insulation between PE and each of the U, V, and W terminals on the motor.
If there is a short-circuit between PE and U, V, or W of the motor, replace the motor.
If insulation is perfect, replace the power wires.

(4) Connect the power wires. Attach the check board (A06B-6071- K290) to connector JX5 to measure the waveform of the actual current (IR and IS) in the servo amplifier module. Accelerate or decelerate the motor,and measure the actual current (IR and IS) of the amplifier.

If an overcurrent alarm occurs right after an emergency stop state is released, go to (5).
Release an emergency stop state, and start the motor.
Check whether the waveform of the actual current (IR and IS) is a normal sine wave.
If normal, go to (5).

If not, replace the amplifier.

(5) Check whether there is noise on the actual current (IR and IS) waveform.
If there is no noise, replace the amplifier.
If there is noise, use a shielding wire, and ground the shielding, or take other counter measures as required.

(6) If still there is noise, a probable cause is a defective command cable or a hardware failure in the CNC.

Content Credit: FANUC Product Manual