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 drive is damaged
• Check the drive output side short circuit for a broken output transistor
B1 and U/T1, V/T2, W/T3
– and U/T1, V/T2, W/T3
• Contact your Yaskawa representative or nearest Yaskawa sales office.
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, C1-05, C1-07)
• 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 (E3-04 through E3-10 for motor 2).
• 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 electrical
signal interference
• Review the possible solutions provided for handling electrical signal 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 wrong motor code has been entered for
OLV/PM (Yaskawa motors only) or the motor
data are wrong
• 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.
The overcurrent level has exceeded the value
set to L8-27 (PM control modes)
Correct the value set to overcurrent detection gain (L8-27).
The motor control method and motor do not
match
• 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.
The rated output current of the drive is too
small
Use a larger drive.
Digital Operator Display Fault Name
oFA00
Option Card Connection Error at Option Port CN5-A
Option compatibility error
5.2 Fault Detection
186
YASKAWA ELECTRIC TOEP C710616 41G YASKAWA AC Drive - A1000 Quick Start Guide
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