Troubleshooting
7
7.5 Minor Faults/Alarms
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 281
Code Name Causes Possible Solutions
ov DC Bus Overvoltage
There are surge voltages in the input power supply. Connect a DC reactor to the drive.
Note:
If you turn the phase advancing capacitors ON and OFF and
use thyristor converters in the same power supply system,
there can be surge voltages that irregularly increase the input
voltage.
The drive output cable or motor is shorted to ground
(the current short to ground is charging the main
circuit capacitor of the drive through the power
supply).
1. Examine the motor main circuit cable, terminals, and motor
terminal box, and then remove ground faults.
2. Re-energize the drive.
The power supply voltage is too high. Decrease the power supply voltage to match the drive rated
voltage.
Electrical interference caused a drive malfunction. • Examine the control circuit lines, main circuit lines, and
ground wiring, and decrease the effects of electrical
interference.
• Check whether a magnetic contactor is the noise source, and
use 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 with 400 V class drives.
• If the drive detects this error, the terminal assigned to H2-01, H2-02, and H2-03 = 4 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-4CM Funct Selection =
Alarm] will be ON.
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 errors with the wiring for main circuit drive input power.
Loose wiring in the input power terminals. Tighten the terminal screws to the correct tightening torque.
The drive input power voltage is changing too
much.
• Examine the input power for problems.
• Make the drive input power stable.
Unsatisfactory balance between voltage phases. • Examine the input power for problems.
• Make the drive input power stable.
• If the input power supply 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 input power for problems.
• Re-energize the drive.
• If the alarm stays, replace the circuit board or the drive.
Contact the manufacturer or your nearest sales representative
for more information.
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, H2-02, and H2-03 = 4 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-4CM Funct Selection =
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 [Enc PGOpen Time for Detection].
• If the drive detects this error, the terminal assigned to H2-01, H2-02, and H2-03 = 4 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-4CM Funct Selection =
Alarm] will be ON.
• If the drive detects this error, it will operate the motor as specified by the Stopping Method set in F1-02 [PGOpen Detection Select].
Code Name Causes Possible Solutions
PGoH Encoder (PG) Hardware Fault
The encoder cable is disconnected. Correct any disconnected wires in the encoder cable.
Note:
• If the drive detects this error, the terminal assigned to H2-01, H2-02, and H2-03 = 4 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-4CM Funct Selection =
Alarm] will be ON.
• If the drive detects this error, it will operate the motor as specified by the Stopping Method set in F1-02 [PGOpen Detection Select].
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