YASKAWA GA700 Series

Troubleshooting
7
7.5 Minor Faults/Alarms
YASKAWA SIEPC71061705H GA700 Series Technical Manual 357
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 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
[CapacitorMaintenance].
• If U4-05 is more than 90%, replace the capacitor. Contact
Yaskawa 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.
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 set to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will activate.
• Parameters F1-20 [Encoder 1 PCB Disconnect Detect] or F1-36 [Encoder 2 PCB Disconnect Detect] enable and disable PGoH detection.
• 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.
Code Name Causes Possible Solutions
STo Safe Torque OFF
Safe Disable inputs H1-HC and H2-HC are open. • Make sure that the Safe Disable signal is input from an
external source to terminal H1-HC and H2-HC.
• When the Safe Disable function is not in use, connect
terminals H1-HC and H2-HC.
There is internal damage to the two Safe Disable
channels.
Replace the board or the drive. For information about replacing
the control board, contact Yaskawa or your nearest sales
representative.
Note:
• The drive will not output an alarm signal for this condition.
• If the drive detects this condition, the terminal set to H2-01 to H2-03 = 21 [MFDO Function Select = Safe Torque OFF] will be ON.