Yaskawa Z1000U HVAC Matrix Bypass User Manual
Page 245
HOA Keypad Display
Fault Name
oFC02
Option Card Fault at Option Port CN5-C
Same type of option card is currently connected
Cause
Possible Solution
An option card of the same type is already installed
in option port CN5-A or CN5-B.
Only one of each option card type can only be installed simultaneously. Make sure only one type of
option card is connected.
An input option card is already installed in option
port CN5-A or CN5-B.
Install a communication option, a digital input option, or an analog input option. More than one of
the same type of card cannot be installed simultaneously.
HOA Keypad Display
Fault Name
oFC03 to oFC11
Option Card Error Occurred at Option Port CN5-C
oFC12 to oFC17
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.
HOA Keypad Display
Fault Name
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.
HOA Keypad 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 capacity (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 (C6-02).
External cooling fan is stopped
• Replace the cooling fan.
Refer to Cooling Fan Replacement: 2
.
• After replacing the cooling fan, set parameter o4-03 to 0 to reset the cooling fan maintenance.
HOA Keypad 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 (C6-02).
• Reduce the load.
HOA Keypad Display
Fault Name
oH3
Motor Overheat Alarm (PTC Input)
• The motor overheat signal to analog input terminals A1, A2, or A3 exceeded the alarm detection
level.
• Detection requires setting multi-function analog inputs H3-02, H3-06, or H3-10 to E.
Cause
Possible Solution
6.4 Fault Detection
YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual
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Diagnostics & Troubleshooting