YASKAWA T103 Installation & Primary Operation page 93

Code Name
L24v Loss of External Power 24 Supply
LoG Com Error / Abnormal SD card
LT-1 Cooling Fan Maintenance Time
LT-2 Capacitor Maintenance Time
LT-3 SoftChargeBypassRelay MainteTime
LT-4 IGBT Maintenance Time (50%)
oH Heatsink Overheat
oH2 External Overheat (H1-XX=B)
oH3 Motor Overheat (PTC Input)
oL3 Overtorque 1
oL4 Overtorque 2
oL5 Mechanical Weakening Detection 1
oS Overspeed
ov Overvoltage
YASKAWA TOEPC71061782C GA800 Drive Installation & Primary Operation
Causes
The voltage of the backup 24 V power supply has
decreased. The main circuit power supply is operating
correctly.
There is not a micro SD in the keypad.
• The drive is connected to USB.
• The number of log communication files is more
than 1000.
• The micro SD card does not have available
memory space.
• The line number data in a log communication file
is not correct.
• A communication error between the keypad and
drive occurred during a log communication.
The cooling fan is at 90% of its expected performance
life.
The capacitors for the main circuit and control circuit
are at 90% of expected performance life.
The soft charge bypass relay is at 90% of its expected
performance life.
The IGBT is at 50% of its expected performance life.
The ambient temperature is high and the heatsink
temperature is more than the L8-02 [Overheat Alarm
Level].
An external device sent an oH2.
The thermistor wiring that detects motor temperature
is defective.
A fault occurred on the machine.
Example: The machine is locked.
A fault occurred on the machine.
Example: The machine is locked.
The drive detected overtorque as specified by the
conditions for mechanical weakening detection set in
L6-08 [Mechanical Fatigue Detect Select].
There is overshoot.
There are surge voltages in the input power supply.
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.)
The power supply voltage is too high.
Electrical interference caused a drive malfunction.
20 Troubleshooting
Possible Solutions
• Examine the external 24 V power supply for disconnected wires
and wiring errors and repair the problems.
• Examine the external 24 V power supply for problems.
Put a micro SD card in the keypad.
Set o5-01 = 0 [Log Start/Stop Selection = OFF].
1. Replace the cooling fan.
2. Set o4-03 = 0 [Fan Operation Time Setting = 0 h] to reset the
cooling fan operation time.
Replace the control board or the drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
Replace the control board or the drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
Check the load, carrier frequency, and output frequency.
• 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.
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 set to
MFDI terminals S1 to S6.
Correct wiring errors.
Examine the machine and remove the cause of the fault.
Examine the machine and remove the cause of the fault.
Do a deterioration diagnostic test on the machine side.
• 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.
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.
1. Examine the motor main circuit cable, terminals, and motor
terminal box, and then remove ground faults.
2. Re-energize the drive.
Decrease the power supply voltage to match the drive rated voltage.
• 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.
• Set L5-01 ≠ 0 [Number of Auto-Restart Attempts ≠ 0 times].
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