YASKAWA CIMR-JA Series Installation & Start-Up Manual page 129

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 motor cable is too long
LED Operator Display
oFA01
Cause
The option unit is not properly
connected to the drive.
LED Operator Display
oH1
YASKAWA ELECTRIC TOEP C710606 25B YASKAWA AC Drive J1000 Installation & Start-Up Manual
• Check the insulation resistance.
• Replace the motor.
• Check the motor cables.
• Remove the short circuit and power the drive back up.
• 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 unit if the current value exceeds the
rated current of the drive.
• 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)
• 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 is not tripped while the drive is
outputting current.
• Check the ratios between the voltage and frequency.
• Set parameter E1-04 through E1-10 appropriately.
• 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 fault occurs simultaneously to overexcitation function operation.
• Consider motor flux saturation and reduce the value of n3-13 (Overexcitation
Deceleration Gain).
• Program the Speed Search command input through one of the multi-function
contact input terminals (H1-oo = "61" or "62").
Use a larger drive.
Option Unit Fault
Replace the option unit.
Turn the power off and reconnect the option unit.
Overheat 1 (Heatsink Overheat)
The temperature of the heatsink has exceeded 100-110 °C. The value is determined
by drive capacity (o2-04).
5.4 Fault Detection
Possible Solution
Fault Name
Possible Solution
Fault Name
5
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