19 Troubleshooting
YASKAWA TOEPC71061737B GA800 Drive Installation & Primary Operation 121
Code Name Causes Possible Solutions
LT-3 SoftChargeBypassRelay MainteTime
The soft charge bypass relay is at 90% of its expected
performance life.
Replace the control board or the drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
LT-4 IGBT Maintenance Time (50%)
The IGBT is at 50% of its expected performance life. Check the load, carrier frequency, and output frequency.
oH Heatsink Overheat
The ambient temperature is high and the heatsink
temperature is more than the L8-02 [Overheat Alarm
Level].
• Measure the ambient temperature.
• Increase the airflow around the drive.
• Install a cooling device (cooling fan or air conditioner) to lower
the ambient temperature.
• Remove objects near the drive that are producing too much heat.
oH2 External Overheat (H1-XX=B)
An external device sent an oH2 alarm. 1. Find the external device that output the overheat alarm.
2. Remove the cause of the problem.
3. Clear the Overheat Alarm (oH2) [H1-xx = B] that was sent to
MFDI terminals S1 to S8.
oH3 Motor Overheat (PTC Input)
The thermistor wiring that detects motor temperature
is defective.
Correct wiring errors.
oL3 Overtorque 1
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the fault.
oL4 Overtorque 2
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the fault.
oL5 Mechanical Weakening Detection 1
The drive detected overtorque as specified by the
conditions for mechanical weakening detection set in
L6-08 [Mechanical Fatigue Detect Select].
Do a deterioration diagnostic test on the machine side.
oS Overspeed
There is overshoot. • Decrease C5-01 [ASR Proportional Gain 1] and increase C5-02
[ASR Integral Time 1].
• Use H6-02 to H6-05 [Pulse Train Input Setting Parameters] to
adjust the pulse train gain.
ov Overvoltage
There are surge voltages in the input power supply. Connect a DC link choke to the drive.
Note:
If you turn the phase advancing capacitors ON and OFF and use
thyristor converters in the same power supply system, there can
be surge voltages that irregularly increase the input voltage.
The drive output cable or motor is shorted to ground
(the current short to ground is charging the main
circuit capacitor of the drive through the power
supply).
1. Examine the motor main circuit cable, terminals, and motor
terminal box, and then remove ground faults.
2. Re-energize the drive.
The power supply voltage is too high. Decrease the power supply voltage to align with the drive rated
voltage.
Electrical interference caused a drive malfunction. • Check the control circuit lines, main circuit lines, and ground
wiring, and minimize the effects of noise.
• Check whether a magnetic contactor is the noise source, and use
Surge Protective Device if necessary.
• Set L5-01 ≠ 0 [Number of Auto-Restart Attempts ≠ 0 times].
PASS Modbus Communication Test
The MEMOBUS/Modbus communications test is
complete.
The PASS display will turn off after communications test mode is
cleared.
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.
Loose wiring in the 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.
Unsatisfactory balance between voltage phases. • 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.
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 capacitor. Contact
Yaskawa or your nearest sales representative for more
information.
• Examine the input power 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.
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.
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