Troubleshooting
7
7.5 Minor Faults/Alarms
SIEPYEUOQ2A01G AC Drive Q2A Technical Manual 291
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 [Multi-Function Digital Output 1, Multi-Function Digital Output 2, and Multi-Function
Digital Output 3 = 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 [Multi-Function Digital Output 1, Multi-Function Digital Output 2, and Multi-Function
Digital Output 3 = 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
The motor has overheated. • Check the load level, acceleration/deceleration time, and motor
start/stop frequency (cycle time).
• Decrease the load.
• Increase the values set in Acceleration/Deceleration Times C1-
01 to C1-08.
• Set E2-01 [Mot Rated Current (FLA)] correctly to the value
specified by the motor nameplate.
• Make sure that the motor cooling system is operating correctly,
and repair or replace it if it is damaged.
• Adjust V/f Pattern Parameters E1-04 to E1-10. For motor 2,
adjust E3-04 to E3-10. Decrease the values set in E1-08 [Mid
A Voltage] and E1-10 [Min Output Voltage].
Note:
If the values set in E1-08 and E1-10 are too low, the load
tolerance will decrease when operating the drive in the low
speed range.
Note:
• The drive detects this fault if the motor overheat signal that was entered to an analog input terminal A3 is more than the alarm detection level when H3-06 = 16 [AI3
Function Selection = Motor Temperature (PTC Input)].
• If the drive detects this error, the terminal assigned to H2-01, H2-02, and H2-03 = 4 [Multi-Function Digital Output 1, Multi-Function Digital Output 2, and Multi-Function
Digital Output 3 = Alarm] will be ON.
• If the drive detects this error, it will operate the motor as specified by the stopping method set in L1-03 [Motor oH AL Reaction Select].
Code Name Causes Possible Solutions
oL3 Overtorque 1
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the fault.
The parameters are incorrect for the load. Adjust L6-02 [Trq Det1 Level] and L6-03 [Trq Det1 Time]
settings.
Note:
• The drive detects this fault if the drive output current is more than the level set in L6-02 for longer than L6-03.
• If the drive detects this error, the terminal assigned to H2-01, H2-02, and H2-03 = 4 [Multi-Function Digital Output 1, Multi-Function Digital Output 2, and Multi-Function
Digital Output 3 = Alarm] will be ON.
• Set the conditions that trigger the minor fault using L6-01 [Trq Det1 Select].
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