HOA Keypad Display
Minor Fault Name
Cause
Possible Solutions
A data error occurred due to noise
• Check options available to minimize the effects of noise.
• Take steps to counteract noise in the control circuit wiring, main circuit lines, and ground wiring.
• Reduce noise on the controller side.
• Use surge absorbers for the magnetic contactors or other components that may be causing the
disturbance.
• Use only recommended shielded line. Ground the shield on the controller side or on the drive input
power side.
• Separate all wiring for communication devices from drive input power lines.
Communication protocol is incompatible
• Check the Z3 parameter settings and the protocol setting in the controller.
• Ensure settings are compatible.
The CE detection time (H5-09) is set shorter than
the time required for a communication cycle to take
place
• Check the PLC.
• Change the software settings in the PLC.
• Set a longer CE detection time using parameter Z3-06.
Incompatible PLC software settings or there is a
hardware problem
• Check the PLC.
• Remove the cause of the error on the controller side.
Communications cable is disconnected or
damaged
• Check the connector to make sure the cable has a signal.
• Replace the communications cable.
HOA Keypad Display
Minor Fault Name
CrST
Cannot Reset
Cause
Possible Solutions
Fault reset was being executed when a Run
command was entered
• Ensure that a Run command cannot be entered from the external terminals or option during fault
reset.
• Turn off the Run command.
HOA Keypad Display
Minor Fault Name
EF
Forward/Reverse Run Command Input Error
Both forward run and reverse run closed simultaneously for longer than 0.5 s.
Cause
Possible Solutions
Sequence error
Check the forward and reverse command sequence and correct the problem.
Note:
When minor fault EF detected, motor ramps to stop.
HOA Keypad Display
Minor Fault Name
EF0
Option Card External Fault
An external fault condition is present.
Cause
Possible Solutions
An external fault was received from the PLC with
F6-03 set to 3, which allows the drive to continue
running after an external fault occurs
• Remove the cause of the external fault.
• Remove the external fault input from the PLC.
There is a problem with the PLC program
Check the PLC program and correct problems.
HOA Keypad Display
Minor Fault Name
FbH
Excessive PI Feedback
The PI feedback input is higher than the level set to b5-36 for longer than the time set to b5-37, and
b5-12 is set to 1 or 4.
Cause
Possible Solutions
Parameter settings for b5-36 and b5-37 are
incorrect
Check parameters b5-36 and b5-37.
PI feedback wiring is faulty
Correct the wiring.
Feedback sensor has malfunctioned
Check the sensor and replace it if damaged.
Feedback input circuit is damaged
Replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
6.5 Alarm Detection
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YASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual
