7.5 Minor Faults/Alarms
282 YASKAWA SIEPC71061753C GA500 Technical Manual
Code Name Causes Possible Solutions
The current level temporarily increased because of
speed search after a momentary power loss or while
trying to Auto Restart.
If speed search or Auto Restart cause an increase in current, the
drive can temporarily show this alarm. The time that the drive
shows the alarm is short. No more steps are necessary to clear the
alarm.
Note:
• The drive detects this error if the drive output current is more than the overcurrent alarm level (150% of the rated current).
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
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.
Note:
• Set o2-23 [External 24V Powerloss Detection] to enable or disable L24v detection.
• The drive will not output an alarm signal for this alarm.
Code Name Causes Possible Solutions
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].
Note:
If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 6A [MFDO Function Select = Data Logger Error] will be ON.
Code Name Causes Possible Solutions
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.
Note:
When the estimated performance life is expired, the terminal assigned to H2-01 to H2-03 = 2F [MFDO Function Select = Maintenance Notification] will be ON.
Code Name Causes Possible Solutions
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.
Note:
When the estimated performance life is expired, the terminal assigned to H2-01 to H2-03 = 2F [MFDO Function Select = Maintenance Notification] will be ON.
Code Name Causes Possible Solutions
LT-3
SoftChargeBypassRelay
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.
Note:
When the estimated performance life is expired, the terminal assigned to H2-01 to H2-03 = 2F [MFDO Function Select = Maintenance Notification] will be ON.
Code Name Causes Possible Solutions
LT-4 IGBT Maintenance Time (50%)
The IGBT is at 50% of its expected performance
life.
Check the load, carrier frequency, and output frequency.
Note:
When the estimated performance life is expired, the terminal assigned to H2-01 to H2-03 = 2F [MFDO Function Select = Maintenance Notification] will be ON.
Code Name Causes Possible Solutions
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.
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