13 Troubleshooting
YASKAWA TOEPC71061752B GA500 Drive Installation & Primary Operation 115
Code Name Causes Possible Solutions
L24v
Loss of External Power
24 Supply
The voltage of the backup 24 V
power supply has decreased. The
main circuit power supply is
operating correctly.
• 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.
LoG Log Com Error
There is not a micro SD in the
keypad.
Put a micro SD card 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 was
changed.
• A communication error
between the keypad and drive
occurred during a log
communication.
Set o5-01 = 0 [Log Start/Stop Selection =
OFF].
LT-1
Cooling Fan
Maintenance Time
The cooling fan is at 90% of its
expected performance life.
1. Use the procedures in this manual to
replace the cooling fan.
2. Set o4-03 = 0 [Fan Operation Time
Setting = 0 h] to reset the cooling fan
operation time.
LT-2
Capacitor Maintenance
Time
The capacitors for the main circuit
and control circuit are at 90% of
expected performance life.
Replace the board or the drive. For
information about replacing the control
board, contact Yaskawa or your nearest sales
representative.
LT-3
SoftChargeBypassRe
lay MainteTime
The soft charge bypass relay is at
90% of its expected performance
life.
Replace the 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.
There is not sufficient airflow
around the drive.
• Give the drive the correct installation
space as shown in the manual.
• Make sure that there is sufficient
circulation around the control panel.
• Examine the drive for dust or other
unwanted materials that could clog the
cooling fan.
• Remove unwanted materials that prevent
air circulation.
The internal cooling fan or fans
have stopped.
1. Use the procedures in this manual to
replace the cooling fan.
2. Set o4-03 = 0 [Fan Operation Time
Setting = 0 h].
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