Yaskawa Z1000U - Manual (Page 194)

Communication data error occurred due to noise
• Check the various options available to minimize the effects of noise.
• Counteract noise in the control circuit, main circuit, and ground wiring.
• Use only recommended cables or other shielded line. Ground the shield on the controller side or
the drive input power side.
• Ensure that other equipment such as switches or relays do not cause noise. Use surge suppressors
if required.
• Separate all communication wiring from drive power lines.
HOA Keypad Display Fault Name
CoF Current Offset Fault
Cause Possible Solution
The drive tried to adjust the current offset value
beyond the allowable range. This is due to residual
induction current in the motor (e.g., during sudden
deceleration or when coasting) when the drive
attempted to start the motor.
• Create a motor restart sequence that allows enough time for residual induction voltage to dissipate.
• Enable Speed Search at start (b3-01 = 1). Use the multi-function terminals to execute External
Speed Search 1 and 2 (H1-oo = 61 or 62).
Note: When using a PM motor, External Speed Searches 1 and 2 perform the same operation.
The current sensor in the drive is damaged
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
CPF00 to CPF03, CPF07, CPF08, CPF11 to
CPF14, CPF16 to CPF24
CPF26 to CPF35
CPF40 to CPF45
Control Circuit Error
HOA Keypad Display Fault Name
CPF06
EEPROM Memory Data Error
Error in the data saved to EEPROM
Cause Possible Solution
There is an error in EEPROM control circuit
• Turn off the power and check the connection between the control board and 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.
The power supply was switched off while
parameters were being saved to the drive
Reinitialize the drive using parameter A1-03.
HOA Keypad Display Fault Name
CPF25 Terminal Board Not Connected
Cause Possible Solution
Terminal board is not connected correctly Reconnect the terminal board to the connector on the drive, then cycle the power to the drive.
HOA Keypad Display Fault Name
doH
Damping Resistor Overheat
The temperature of the built-in damping resistor exceeded the set value.
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.
5.4 Fault Detection
194 YASKAWA ELECTRIC TOEP C710636 10B Z1000U HVAC MATRIX Drive User Manual