YASKAWA AC Drive-A1000 Technical Manual page 306

6.4 Fault Detection
The output circuit is damaged
Motor impedance or motor phases are uneven
Digital Operator Display
Cause
The node setup terminal closed during run.
A Run command was issued while the node
setup function was active.
Digital Operator Display
Cause
The motor has been damaged due to
overheating or the motor insulation is
damaged
One of the motor cables has shorted out or
there is a grounding problem
The load is too heavy
The acceleration or deceleration times are too
short
The drive is attempting to operate a specialized
motor or a motor larger than the maximum size
allowed
Magnetic contactor (MC) on the output side of
the drive has turned on or off
V/f setting is not operating as expected
Excessive torque compensation
Drive fails to operate properly due to noise
interference
Overexcitation gain is set too high
Run command applied while motor was
coasting
The wrong motor code has been entered for
PM Open Loop Vector (Yaskawa motors
only) or the motor data are wrong
The motor control method and motor do not
match
The rated output current of the drive is too
small
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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.
• Measure the line-to-line resistance for each motor phase. Ensure all values are the same.
• Replace the motor.
Node Setup Error
nSE
A terminal assigned to the node setup function closed during run.
Stop the drive when using the node setup function.
Overcurrent
oC
Drive sensors detected an output current greater than the specified overcurrent level.
• Check the insulation resistance.
• Replace the motor.
• 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.
• 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.
Calculate the torque needed during acceleration relative to the load inertia and the specified acceleration
time. If the right amount of torque cannot be set, make the following changes:
• Increase the acceleration time (C1-01, -03, -05, -07)
• Increase the S-curve characteristics (C2-01 through C2-04)
• Increase the capacity of the drive.
• 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.
Set up the operation sequence so that the MC does not trip while the drive is outputting current.
• 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.
• Check the amount of torque compensation.
• Reduce the torque compensation gain (C4-01) until there is no speed loss and less current.
• 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.
• Check if the fault occurs simultaneously with overexcitation function operation.
• Consider motor flux saturation and reduce the value of n3-13 (Overexcitation Deceleration Gain).
• Enable Speed Search at start (b3-01 = 1).
• Program the Speed Search command input through one of the multi-function contact input terminals
(H1-oo = 61 or 62).
• Enter the correct motor code to E5-01.
• Set E5-01 to FFFF if using a non-Yaskawa PM motor. Set the correct motor data to the E5-oo
parameters or perform Auto-Tuning.
• Check the control mode.
• For IM motors, set A1-02 to 0, 1, 2, or 3.
• For PM motors, set A1-02 to 5, 6, or 7.
Use a larger drive.
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
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