Troubleshooting
7
7.4 Fault
YASKAWA SIEPC71061737D GA800 Drive Technical Reference 385
Code Name Causes Possible Solutions
Noise interference along the encoder cable. Isolate the encoder cable from the drive output line or a different
source of electrical interference.
Electrical interference caused a drive malfunction. • Examine the control circuit lines, main circuit lines, and ground
wiring, and decrease the effects of electrical interference.
• Make sure that a magnetic contactor is not the source of the
electrical interference, then use a Surge Protective Device if
necessary.
The load inertia is set incorrectly. • Examine the load inertia settings with KEB, overvoltage
suppression, or stall prevention during deceleration.
• Adjust L3-25 [Load Inertia Ratio] to match the qualities of the
machine.
You used the Short Circuit Braking function when
A1-02 = 5 [Control Method Selection = OLV/PM].
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].
Speed Search at Start does not complete correctly
when:
• A1-02 = 8 [Control Method Selection = EZOLV]
• E9-01 = 0 [Motor Type Selection = Induction
(IM)]
Set b3-24 = 2 [Speed Search Method Selection = Current Detection
2].
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.
• For 200 V class drives, the detection level of ov is approximately 410 V. For 400 V class drives, the detection level is approximately 820 V.
• L5-08 [Fault Reset Enable Select Grp2] disables the Auto Restart function.
Code Name Causes Possible Solutions
PE1 PLC Fault 1
The communication option detected a fault. Refer to the manual for the communication option card.
Note:
Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
PE2 PLC Fault 2
The communication option detected a fault. Refer to the manual for the communication option card.
Note:
Do a Fault Reset to clear the fault.
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.
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