Troubleshooting
6
6.4 Faults
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 351
Code Name Causes Possible Solutions
The internal cooling fan of the drive
stopped.
1. Use the procedure in this manual to replace
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 value set in L8-02
[Overheat Alarm 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 any wiring errors.
A fault occurred on the machine side.
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 E1-08 and E1-10 are set too low, the overload
tolerance will decrease at low speeds.
Note:
• The drive detects this fault if the motor overheat signal that was entered to an analog input terminals A1, A2, or A3 is more than the
alarm detection level. (If H3-02, H3-10, or H3-06 = E [MFAI Function Select = Motor Temperature (PTC Input)] was set.)
• 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].
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