Troubleshooting
7
7.5 Minor Faults/Alarms
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 279
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.Oper Setting = 0 h] to reset the cooling
fan operation time.
Note:
When the estimated performance life is expired, the terminal assigned to H2-01, H2-02, and H2-03 =63 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-4CM
Funct Selection = Maintenance] 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 control board or the drive. For information about
replacing the control board, contact the manufacturer or your
nearest sales representative.
Note:
When the estimated performance life is expired, the terminal assigned to H2-01, H2-02, and H2-03 = 63 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-
4CM Funct Selection = Maintenance] 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 control board or the drive. For information about
replacing the control board, contact the manufacturer or your
nearest sales representative.
Note:
When the estimated performance life is expired, the terminal assigned to H2-01, H2-02, and H2-03 = 63 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-
4CM Funct Selection = Maintenance] 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, H2-02, and H2-03 = 63 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-
4CM Funct Selection = Maintenance] 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 Alm
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.Oper Setting = 0 h] to reset the cooling
fan operation time.
Note:
• The drive detects this error if the heatsink temperature of the drive is more than L8-02.
• If the drive detects this error, the terminal assigned to H2-01, H2-02, and H2-03 = 4 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-4CM Funct Selection =
Alarm] will be ON.
• Set the stopping method for this fault in L8-03 [Overheat Pre-Alarm Selection].
Code Name Causes Possible Solutions
oH2 External Overheat (H1-XX=7D)
An external device sent an oH2. 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 = 7D] that was set to
MFDI terminals DI1 to DI8.
Note:
If the drive detects this error, the terminal assigned to H2-01, H2-02, and H2-03 = 4 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-4CM Funct Selection =
Alarm] will be ON.
Code Name Causes Possible Solutions
oH3 Motor Overheat (PTC Input)
The thermistor wiring that detects motor
temperature is defective.
Correct wiring errors.
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the fault
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