Yaskawa Z1000U User Manual
Page 195
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 = 20 to 2F).
• Reconnect the signal line.
Multi-function contact input setting is incorrect
• Check for unused terminals set for H1-oo = 20 to 2F (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
Internal cooling fan has malfunctioned
• Cycle power to the drive.
• Check for fan operation.
• Verify the cumulative operation time of the fan with monitor U4-03, and verify the cumulative
operation time of the fan maintenance timer with U4-04.
• If the cooling fan has exceeded its expected performance life or is damaged in any other way, follow
the replacement instructions in the
chapter.
Fault detected in the internal cooling fan or
magnetic contactor to the power supply
• Cycle power to the drive.
• If the fault continues to occur, replace the power board/gate drive board or the entire drive.
• Contact Yaskawa or a Yaskawa representative for instructions on replacing the power board/gate
drive board.
HOA Keypad Display
Fault Name
FbH
Excessive PI Feedback
PI feedback input is greater than the level set to b5-36 for longer than the time set to b5-37. Set b5-12
to 2 or 5 to enable fault detection.
Cause
Possible Solution
Parameters are set inappropriately
Check b5-36 and b5-37 settings.
Incorrect PI feedback wiring
Correct the wiring.
There is a problem with the feedback sensor
• Check the sensor on the control side.
• Replace the sensor if damaged.
5.4 Fault Detection
YASKAWA ELECTRIC TOEP C710636 10B Z1000U HVAC MATRIX Drive User Manual
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5
Troubleshooting