YASKAWA GA700 Series Technical Manual page 357

Code Name
PASS Modbus Communication Test
Code Name
PF Input Phase Loss
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
PGo Encoder (PG) Feedback Loss
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
PGoH Encoder (PG) Hardware Fault
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
rUn Motor Switch during Run
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
SE Modbus Test Mode Error
Note:
If detected, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
Code Name
STo Safe Torque OFF
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.
YASKAWA SIEPC71061705H GA700 Series Technical Manual
Causes
The MEMOBUS/Modbus communications test is
complete.
Causes
There is a phase loss in the drive input power.
Loose wiring in the input power terminals.
The drive input power voltage is changing too
much.
Unsatisfactory balance between voltage phases.
The main circuit capacitors have become
unserviceable.
Causes
The encoder cable is disconnected or wired
incorrectly.
The encoder is not receiving power.
The holding brake is stopping the motor.
Causes
The encoder cable is disconnected.
Causes
The drive received a Motor 2 Selection [H1-xx =
16] during run.
Causes
MEMOBUS/Modbus communications self-
diagnostics [H1-xx = 67] was done while the drive
was running.
Causes
Safe Disable inputs H1-HC and H2-HC are open.
There is internal damage to the two Safe Disable
channels.
7.5 Minor Faults/Alarms
Possible Solutions
The PASS display will turn off after communications test mode is
cleared.
Possible Solutions
Correct all wiring errors with the main circuit power supply.
Tighten the screws to the correct tightening torque.
• Examine the supply voltage for problems.
• Make the drive input power stable.
• 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.
• 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.
Possible Solutions
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
Examine the encoder power supply.
Release the holding brake.
Possible Solutions
Correct any disconnected wires in the encoder cable.
Possible Solutions
Make sure that the drive receives the Motor 2 Selection while the
drive is stopped.
Possible Solutions
Stop the drive and do MEMOBUS/Modbus communications self-
diagnostics.
Possible Solutions
• 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.
Replace the board or the drive. For information about replacing
the control board, contact Yaskawa or your nearest sales
representative.
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