YASKAWA T103 Installation & Primary Operation page 89

Code Name
PE1 PLC Fault 1
PE2 PLC Fault 2
PF Input Phase Loss
PGo Encoder (PG) Feedback Loss
PGoH Encoder (PG) Hardware Fault
rF Braking Resistor Fault
rH Braking Resistor Overheat
rr Dynamic Braking Transistor Fault
SC Short Circuit/IGBT Failure
SCF Safety Circuit Fault
YASKAWA TOEPC71061782C GA800 Drive Installation & Primary Operation
Causes
The load inertia is set incorrectly.
The Short Circuit Braking function used in OLV/PM
control method.
There is motor hunting.
Speed Search at Start does not complete correctly
when:
• A1-02 = 8 [Control Method Selection = EZOLV]
• E9-01 = 0 [Motor Type Selection = Induction
(IM)]
The communication option detected a fault.
The communication option detected a fault.
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.
The encoder cable is disconnected or wired
incorrectly.
The encoder cable is disconnected.
The resistance of the dynamic braking option that is
connected to the drive is too low.
The deceleration time is too short and excessive
regenerative energy is flowing back into the drive.
The duty cycle is too high.
The braking load is too heavy.
The braking resistor is not sufficient.
The drive control circuit is damaged.
There is a malfunction in the internal braking
transistor of the drive.
Overheating caused damage to the motor or the motor
insulation is not satisfactory.
The safety circuit is broken.
20 Troubleshooting
Possible Solutions
• 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.
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].
Set b3-24 = 2 [Speed Search Method Selection = Current Detection
2].
Refer to the manual for the communication option card.
Refer to the manual for the communication option card.
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.
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
Connect any disconnected wires in the encoder cable.
Use a dynamic braking option that fits the model and duty rating of
the drive.
• Check the load level, deceleration time, and speed.
• Decrease the load.
• Increase the values set in C1-02, C1-04, C1-06, or C1-08
[Deceleration Times].
• Use a dynamic braking option that lets you use more power.
Examine the duty cycle.
Note:
When L8-01 = 1 [3% ERF DB Resistor Protection = Enabled],
the maximum braking duty cycle is 3%.
• Calculate the braking load and braking power again, and
decrease the braking load.
• Use a braking resistor that improves braking power.
Use the braking resistor specifications to select a sufficient braking
resistor.
• Re-energize the drive.
• If the fault stays, replace the control board or the drive. For
information about replacing the control board, contact Yaskawa
or your nearest sales representative.
Measure the motor insulation resistance, and replace the motor if
there is electrical conduction or unserviceable insulation.
Replace the control board or the drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
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