Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 237)

HOA Keypad Display Fault Name
Cause Possible Solution
• The capacity of the power supply is too small.
• The distortion in the power supply is too large. • Increase the capacity of the power supply.
• Lower the impedance of the input power supply wiring.
A phase loss occurred in the input power supply. Check the input power supply for phase loss or an imbalance in the interphase voltages.
HOA Keypad Display Fault Name
EF0
Option Card External Fault
An external fault condition is present.
Cause Possible Solution
An external fault was received from the PLC and
F6-03 is set to a value other than 3
• Remove the cause of the external fault.
• Remove the external fault input from the PLC.
Problem with the PLC program Check the PLC program and correct problems.
HOA Keypad Display Fault Name
EF1
External Fault (input terminal S1)
External fault at multi-function input terminal S1.
EF2
External Fault (input terminal S2)
External fault at multi-function input terminal S2.
EF3
External Fault (input terminal S3)
External fault at multi-function input terminal S3.
EF4
External Fault (input terminal S4)
External fault at multi-function input terminal S4.
EF5
External Fault (input terminal S5)
External fault at multi-function input terminal S5.
EF6
External Fault (input terminal S6)
External fault at multi-function input terminal S6.
EF7
External Fault (input terminal S7)
External fault at multi-function input terminal S7.
EF8
External Fault (input terminal S8)
External fault at multi-function input terminal S8.
Cause Possible Solution
An external device tripped an alarm function
• Properly connect the signal lines to the terminals assigned for external fault detection
(H1-oo = 24).
• Reconnect the signal line.
Multi-function contact input setting is incorrect
• Check for unused terminals set for H1-oo = 24 (External Fault).
• Change the terminal settings.
HOA Keypad Display Fault Name
Err
EEPROM Write Error
Data cannot be written to the EEPROM
Cause Possible Solution
Noise has corrupted data while writing to the
EEPROM
• Press “ENTER” on the HOA keypad.
• Correct the parameter setting.
• 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.
Hardware problem
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
FAn
Internal Fan Fault
Fan or magnetic contactor failure
Cause Possible Solution
6.4 Fault Detection
YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual 237
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Diagnostics & Troubleshooting