HOA Keypad Display
Fault Name
When the feedback deviates from the
setpoint at a level greater than P1-15, for a
time set in P1-16. This is effective only
when P1-17 is set to 0 (fault).
• Check for a blocked impeller, over cycling, or broken pipe.
• Set the Not Maintaining Setpoint fault characteristics in P1-16 and P1-17.
• Drive response to this condition is controlled by P1-17, Not Maintaining Setpoint Selection.
• Auto-restart of this fault is controlled by L5-50, Setpoint Not Met Retry.
HOA Keypad Display
Fault Name
nSE
Node Setup Error
A terminal assigned to the node setup function closed during run.
Cause
Possible Solution
The node setup terminal closed during run.
Stop the drive when using the node setup function.
A Run command was issued while the node
setup function was active.
HOA Keypad Display
Fault Name
oC
Overcurrent
Drive sensors detected an output current greater than the specified overcurrent level.
Cause
Possible Solution
The motor has been damaged due to
overheating or the motor insulation is
damaged
• Check the insulation resistance.
• Replace the motor.
One of the motor cables has shorted out or
there is a grounding problem
• Check the motor cables.
• Remove the short circuit and reapply power to the drive.
• Check the resistance between the motor cables and the ground terminal .
• Replace damaged cables.
The load is too heavy
• Measure the current flowing into the motor.
• Replace the drive with a larger capacity drive if the current value exceeds the rated current.
• Determine if there is sudden fluctuation in the current level.
• Reduce the load to avoid sudden changes in the current level or switch to a larger drive.
The acceleration or deceleration times are
too short
Calculate the torque needed during acceleration relative to the load inertia and the specified acceleration
time. If it is not possible to set the proper amount of torque, make the following changes:
• Increase the acceleration time (C1-01, C1-03).
• Increase the S-curve characteristics (C2-01 through C2-04).
• Increase the capacity of the drive.
The drive is attempting to operate a
specialized motor or a motor larger than the
maximum size allowed
• Check the motor capacity.
• Ensure that the rated capacity of the drive is greater than or equal to the capacity rating found on the motor
nameplate.
Magnetic contactor (MC) on the output side
of the drive has turned on or off
Set up the operation sequence so the MC does not trip while the drive is outputting current.
V/f setting is not operating as expected
• Check the ratios between the voltage and frequency.
• Set parameters E1-04 through E1-10 appropriately.
• Lower the voltage if it is too high relative to the frequency.
Excessive torque compensation
• Check the amount of torque compensation.
• Reduce the torque compensation gain (C4-01) until there is no speed loss and less current.
Drive fails to operate properly due to noise
interference
• Review the possible solutions provided for handling noise interference.
• Review the section on handling noise interference and check the control circuit lines, main circuit lines,
and ground wiring.
Overexcitation gain is set too high
• Check if the fault occurs simultaneously with overexcitation function operation.
• Consider motor flux saturation and reduce the value of n3-13 (Overexcitation Deceleration Gain).
Run command was applied while motor
was coasting
• Set b3-01 to 1 to enable Speed Search at Start.
• Program the Speed Search command input through one of the multi-function contact input terminals
(H1-
oo
= 61 or 62).
The rated output current of the drive is too
small
Use a larger drive.
5.3 Fault Detection
YASKAWA TOEPYAIUPW01A YASKAWA AC Drive - U1000 iQpump Matrix Drive User Manual
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5
Troubleshooting
