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Troubleshooting

7.5 Minor Faults/Alarms

SIEPCYEUOQ2V01A Q2V Technical Manual 245

Code Name Causes Possible Solutions

Electrical interference caused a drive malfunction. • Examine the control circuit lines, main circuit lines, and

ground wiring, and decrease the effects of electrical

interference.

• Make sure that a magnetic contactor is not the source of the

electrical interference, then use a Surge Protective Device if

necessary.

• Set L5-01 ≠ 0 [Auto-Reset Attempts ≠ 0 times].

Note:

• The drive detects this error if the DC bus voltage is more than the ov detection level when the Run command has not been input (while the drive is stopped).

• The ov detection level is approximately 410 V with 200 V class drives. The detection level is approximately 820 V for 400 V class drives.

• If the drive detects this error, the terminal set to H2-01 to H2-03 = 4 [MFDO Function Select = Alarm] will activate.

Code Name Causes Possible Solutions

PASS Modbus Communication Test

The Modbus communications test is complete. The PASS display will turn off after communications test mode is

cleared.

Code Name Causes Possible Solutions

PF Input Phase Loss

There is a phase loss in the drive input power. Correct all wiring errors with the main circuit power supply.

Loose wiring in the input power terminals. Tighten the screws to the correct tightening torque.

The drive input power voltage is changing too

much.

• Examine the supply voltage for problems.

• Make the drive input power stable.

Unsatisfactory balance between voltage phases. • Examine the supply voltage for problems.

• Make the drive input power stable.

• If the supply voltage is good, examine the magnetic contactor

on the main circuit side for problems.

The main circuit capacitors have become

unserviceable.

• Examine the capacitor maintenance time in monitor U4-05

[Capacitor Maintenance].

• If U4-05 is more than 90%, replace the capacitor. Contact the

manufacturer or your nearest sales representative for more

information.

• Examine the supply voltage for problems.

• Re-energize the drive.

• If the alarm stays, replace the circuit board or the drive. For

information about replacing the control board, contact the

manufacturer or your nearest sales representative.

Note:

• The drive detects this error if the DC bus voltage changes irregularly without regeneration.

• If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 4 [MFDO Function Select = Alarm] will be ON.

• Use L8-05 [In PhaseLoss Selection] to enable and disable PF detection.

Code Name Causes Possible Solutions

PGo Encoder (PG) Feedback Loss

The encoder cable is disconnected or wired

incorrectly.

Examine for wiring errors or disconnected wires in the encoder

cable, and repair problems.

The encoder is not receiving power. Examine the encoder power supply.

The holding brake is stopping the motor. Release the holding brake.

Note:

• The drive detects this error if it does not receive the speed detection pulse signal from the encoder in the detection time set in F1-14 [Encoder Open-Circuit Detect Time].