YASKAWA GA700 Technical Manual page 356

6.4 Faults
Code Name
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
PF Input Phase Loss
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
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].
• 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
PGoH Encoder (PG) Hardware
Fault
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].
356
Causes
The Short Circuit Braking function used
in OLV/PM control method.
There is motor hunting.
Causes
There is a phase loss in the drive input
power.
There is loose wiring in the drive input
power terminals.
The drive input power voltage is
changing too much.
There is 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. Release the holding brake.
Causes
The encoder cable is disconnected.
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Possible Solutions
Connect a braking resistor to the drive.
• 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].
Possible Solutions
Correct errors with the wiring for main circuit
drive input power.
Tighten the terminal screws to the correct
tightening torque.
• 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.
• Examine the input power for problems.
• Make the drive input power stable.
• Set L8-05 = 0 [Input Phase Loss Protection Sel
= Disabled].
• 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.
Possible Solutions
Examine for wiring errors or disconnected wires in
the encoder cable, and repair problems.
Examine the encoder power supply.
Possible Solutions
Connect all encoder cable wires.