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
Current Limit
Foldback
Current Limit Foldback
Cause
Possible Solution
Drive output speed is being limited due to
the output current limit.
• Reduce the load.
• Verify setting of Q3-02.
• Change to a larger drive size.
HOA Keypad Display
Minor Fault Name
CyC
MECHATROLINK Comm. Cycle Setting Error
Comm. Cycle Setting Error was detected.
Cause
Possible Solutions
The controller is using a comm. cycle
beyond the allowable setting range for the
MECHATROLINK option.
Set the comm. cycle for the upper controller within the allowable setting range for the MECHATROLINK
option.
HOA Keypad Display
Minor Fault Name
De-Scale/De-rag
Active
De-scale is running
Cause
Possible Solution
De-scale is programmed and enough run
time has been accumulated.
If De-scale/De-rag is not desired, program P8-01 = 0 (Disabled).
Adjust the De-scale Run Timer P8-08.
HOA Keypad Display
Minor Fault Name
Differential FB
Detected
Differential Feedback Detected
Cause
Possible Solution
The difference between the PID Feedback
and the Differential Feedback (H3-
oo
=
28) exceeded the P4-18 level for the time
set in P4-19.
• Replace the feedback transducer or transducers.
• Verify parameter settings P4-18 to P4-20.
HOA Keypad Display
Minor Fault Name
dnE
Drive Disabled
Cause
Possible Solution
“Drive Enable” is set to a multi-function
contact input (H1-
oo
= 6A) and the
contact is open.
Check the operation sequence.
HOA Keypad Display
Minor Fault Name
doH
Damping Resistor Overheat
The temperature of the built-in damping resistor exceeded the set value.
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
Minor Fault Name
EF
Forward/Reverse Run Command Input Error
Both forward run and reverse run closed simultaneously for longer than 0.5 s.
5.4 Alarm Detection
YASKAWA TOEPYAIUPW01A YASKAWA AC Drive - U1000 iQpump Matrix Drive User Manual
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Troubleshooting