
Digital Operator Display
Fault Name
Cause
Possible Solution
Option card or hardware is damaged
• Cycle power to the drive.
• If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the control board.
Digital Operator Display
Fault Name
to
oFC50 to oFC55
Option Card Error Occurred at Option Port CN5-C
Cause
Possible Solution
Option card or hardware is damaged
Refer to the option manual for details.
Digital Operator Display
Fault Name
oH
Heatsink Overheat
The heatsink temperature exceeded the overheat pre-alarm level set to L8-02. The default value for L8-02
is determined by drive model selection (o2-04).
Cause
Possible Solution
Surrounding temperature is too high
• Check the temperature surrounding the drive. Verify temperature is within drive specifications.
• Improve the air circulation within the enclosure panel.
• Install a fan or air conditioner to cool the surrounding area.
• Remove anything near the drive that might be producing excessive heat.
Load is too heavy
• Measure the output current.
• Decrease the load.
• Lower the carrier frequency selection (C6-02).
Internal cooling fan is stopped
• Replace the cooling fan.
• After replacing the cooling fan, set parameter o4-03 to 0 to reset the cooling fan maintenance.
Digital Operator Display
Fault Name
oH1
Overheat 1 (Heatsink Overheat)
The heatsink temperature exceeded the drive overheat level. Overheat level is determined by drive
capacity (o2-04).
Cause
Possible Solution
Surrounding temperature is too high
• Check the temperature surrounding the drive.
• Improve the air circulation within the enclosure panel.
• Install a fan or air conditioner to cool the surrounding area.
• Remove anything near the drive that might be producing excessive heat.
Load is too heavy
• Measure the output current.
• Lower the carrier frequency selection (C6-02).
• Reduce the load.
Digital Operator Display
Fault Name
oH5
Motor Overheat (NTC Input)
The motor temperature exceeded the level set to L1-16 (or L1-18 for motor 2)
Cause
Possible Solution
Motor has overheated
• Reduce the load.
• Check the ambient temperature.
<1> Detected in models 4A0930 and 4A1200.
Digital Operator Display
Fault Name
oL1
Motor Overload
The electronic motor overload protection tripped
Cause
Possible Solution
Load is too heavy
Reduce the load.
Cycle times are too short during acceleration
and deceleration
Increase the acceleration and deceleration times (C1-01 through C1-04).
6.4 Fault Detection
YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
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Troubleshooting