YASKAWA U1000 iQpump Drive, Technical Manual

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Digital Operator Display Fault Name
LSo
LSo Fault
Pull-out has been detected at low speed.
Cause Possible Solution
The incorrect motor code has been entered.
• Enter the correct motor code for the PM motor being used into E5-01.
• For special-purpose motors, enter the correct data to all E5 parameters according to the test report
provided for the motor.
The load is too heavy.
• Reduce the load.
• Use a larger drive.
The drive incorrectly detected the position of
the motor poles.
• Make sure some external force is not rotating the motor at start.
• Enable Speed Search Selection at start. (b3-01 = 1).
• If the value displayed in U6-57 is lower than 819, then set the polarity judge current (n8-84) higher
than the default value.
Values set to parameters L8-93, L8-94, and
L8-95 are incorrect.
• Increase the value set to L8-93.
• Increase the value set to L8-94.
• Increase the value set to L8-95.
This function prevents continuous operation in reverse when using high frequency injection (n8-57 = 1) in AOLV/PM (A1-02 = 6) with a motor
for which no motor code has been entered (it does not only prevent reverse operation). Set L8-93, L8-94, and L8-95 to low values within range of
erroneous detection to quickly detect undesirable reverse operation.
Digital Operator 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.
Digital Operator 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.
• Use a drive that is one frame larger 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 use a drive that is one frame larger.
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, C1-05, C1-07)
• Increase the S-curve characteristics (C2-01 through C2-04)
• Use a drive that is one frame larger.
The drive is attempting to operate a specialized
motor or a motor larger than the rated current
allowed
• Check the motor capacity.
• Ensure that the rated current of the drive is greater than or equal to the current 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 (E3-04 through E3-10 for motor 2).
• Lower the voltage if it is too high relative to the frequency.
6.4 Fault Detection
374 YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual