Troubleshooting
7
7.4 Fault
YASKAWA SIEPC71061753C GA500 Technical Manual 269
Code Name Causes Possible Solutions
The internal cooling fan of the drive stopped. 1. Use the procedures in this manual to replace the cooling fan.
2. Set o4-03 = 0 [Fan Operation Time Setting = 0 h].
Note:
• The drive detects this fault if the heatsink temperature of the drive is more than the value set in L8-02.
• Do a Fault Reset to clear the fault.
• If the drive detects this fault, it will operate the motor as specified by the Stopping Method set in L8-03 [Overheat Pre-Alarm Selection].
Code Name Causes Possible Solutions
oH1 Heatsink Overheat
The ambient temperature is high and the heatsink
temperature of the drive is more than the oH1
detection level.
• Measure the ambient temperature.
• Increase the airflow in the control panel.
• 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.
The load is too heavy. • Measure the output current.
• Decrease the load.
• Decrease the value set in C6-02 [Carrier Frequency
Selection].
Note:
• The drive detects this fault if the heatsink temperature of the drive is more than the oH1 detection level. o2-04 [Drive Model (KVA) Selection] determines the oH1 detection
level.
• Do a Fault Reset to clear the fault.
• L5-08 [Fault Reset Enable Select Grp2] disables the Auto Restart function.
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 C1-01 to C1-08 [Acceleration/
Deceleration Times].
• Set E2-01 [Motor 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 E1-04 to E1-10 [V/f Pattern Parameters]. For motor 2,
adjust E3-04 to E3-10. Decrease the values set in E1-08 [Mid
Point A Voltage] and E1-10 [Minimum Output Voltage].
Note:
If the values set in E1-08 and E1-10 are too low, the overload
tolerance will decrease at low speeds.
Note:
• When H3-02 or H3-10 = E [MFAI Function Select = Motor Temperature (PTC Input)], the drive detects this fault if the motor overheat signal input from analog input
terminal A1 or A2 is more than the alarm detection level.
• Do a Fault Reset to clear the fault.
• If the drive detects this fault, it will operate the motor as specified by the Stopping Method set in L1-03 [Motor Thermistor oH Alarm Select].
Code Name Causes Possible Solutions
oH4 Motor Overheat Fault (PTC Input)
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 C1-01 to C1-08 [Acceleration/
Deceleration Times].
• Set E2-01 [Motor 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 E1-04 to E1-10 [V/f Pattern Parameters]. For motor 2,
adjust E3-04 to E3-10. Decrease the values set in E1-08 [Mid
Point A Voltage] and E1-10 [Minimum Output Voltage].
Note:
If the values set in E1-08 and E1-10 are too low, the overload
tolerance will decrease at low speeds.
Note:
• The drive detects this fault if the motor overheat signal in analog input terminals A1, or A2 is more than the Fault detection level. (If H3-02, H3-10= E [Terminal A1/A2
Function Select = Motor Temperature (PTC Input)].)
• Do a Fault Reset to clear the fault.
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