6.4 Faults
356 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Code Name Causes Possible Solutions
The Short Circuit Braking function used
in OLV/PM control method.
Connect a braking resistor to the drive.
There is motor hunting. • Adjust n1-02 [Hunting Prevention Gain Setting].
• Adjust n2-02 [Automatic Freq Regulator Time
1] and n2-03 [Automatic Freq Regulator Time
2].
• Adjust n8-45 [Speed Feedback Detection Gain]
and n8-47 [Pull-in Current Comp Filter Time].
Note:
• The drive detects this error if the DC bus voltage is more than the ov detection level while the drive is running.
• Do a Fault Reset to clear the fault.
• 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.
• L5-08 [Fault Reset Enable Select Grp2] disables the Auto Restart function.
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.
There is loose wiring in the drive 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.
• If the input power supply is good, examine the
magnetic contactor on the main circuit side for
problems.
There is unsatisfactory balance between
voltage phases.
• Examine the input power for problems.
• Make the drive input power stable.
• Set L8-05 = 0 [Input Phase Loss Protection Sel
= Disabled].
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 control board
or the drive. For information about replacing the
control board, contact Yaskawa or your nearest
sales representative.
• If drive input power is correct and the fault
stays, replace the control board or the drive. For
information about replacing the control board,
contact Yaskawa or your nearest sales
representative.
Note:
• The drive detects this error if the DC bus voltage changes irregularly without regeneration.
• Do a Fault Reset to clear the fault.
• Use L8-05 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].
• Do a Fault Reset to clear the fault.
• 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. Connect all encoder cable wires.
Note:
• Do a Fault Reset to clear the fault.
• 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].
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