YASKAWA GA700 Series Technical Manual page 340

7.4 Fault
Code Name
oH Heatsink Overheat
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
oH1 Heatsink Overheat
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
oH3 Motor Overheat (PTC Input)
Note:
• When H3-02, H3-10, or H3-06 = E [MFAI Function Selection = Motor Temperature (PTC Input)], the drive detects this fault if the motor overheat signal entered to an
analog input terminal A1, A2, or A3 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].
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Causes
The ambient temperature is high and the heatsink
temperature of the drive is more than the value set
in L8-02 [Overheat Alarm Level].
The load is too heavy.
The internal cooling fan of the drive stopped.
Causes
The ambient temperature is high and the heatsink
temperature of the drive is more than the oH1
detection level.
The load is too heavy.
Causes
The thermistor wiring that detects motor
temperature is defective.
A fault occurred on the machine.
Example: The machine is locked.
The motor has overheated.
Possible Solutions
• 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.
• Measure the output current.
• Decrease the load.
• Decrease the value set in C6-02 [Carrier Frequency
Selection].
1. Use the procedures in this manual to replace the cooling fan.
2. Set o4-03 = 0 [Fan Operation Time Setting = 0 h].
Possible Solutions
• 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.
• Measure the output current.
• Decrease the load.
• Decrease the value set in C6-02 [Carrier Frequency
Selection].
Possible Solutions
Correct wiring errors.
Examine the machine and remove the cause of the fault
• 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.
YASKAWA SIEPC71061705H GA700 Series Technical Manual