Troubleshooting
6
6.5 Minor Faults/Alarms
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 371
Code Name Causes Possible Solutions
PASS Modbus Communication
Test
The MEMOBUS/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 [CapacitorMaintenance].
• If U4-05 is more than 90%, replace the
capacitor. Contact Yaskawa 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 Yaskawa 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 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
• Use L8-05 [Input Phase Loss Protection Sel] 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].
• If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = 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 [PG Open Circuit 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 to H2-03 = 10 [MFDO Function Select = 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 [PG Open Circuit Detection
Select].
Code Name Causes Possible Solutions
rUn Motor Switch during Run The drive received a Motor 2 Selection
[H1-xx = 16] during run.
Make sure that the drive receives the Motor 2
Selection while the drive is stopped.
Note:
If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
Code Name Causes Possible Solutions
SE Modbus Test Mode Error MEMOBUS/Modbus communications
self-diagnostics [H1-xx = 67] was done
while the drive was running.
Stop the drive and do MEMOBUS/Modbus
communications self-diagnostics.
Note:
If detected, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
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