The load is too heavy.
• 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.
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 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.
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 that the MC is not tripped 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 fault occurs simultaneously to overexcitation function operation.
• Consider motor flux saturation and reduce the value of n3-13 (Overexcitation
Deceleration Gain).
Run command applied while motor
was coasting.
• Program the Speed Search command input through one of the multi-function
contact input terminals (H1-
oo
= “61” or “62”).
The motor cable is too long
Use a larger drive.
LED Operator Display
Fault Name
oFA01
Option Unit Fault
Replace the option unit.
Cause
Possible Solution
The option unit is not properly
connected to the drive.
Turn the power off and reconnect the option unit.
LED Operator Display
Fault Name
oH1
Overheat 1 (Heatsink Overheat)
The temperature of the heatsink exceeded the overheat pre-alarm level.
5.4 Fault Detection
YASKAWA ELECTRIC TOEP C710606 25D YASKAWA AC Drive J1000 Installation & Start-Up Manual
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5
Troubleshooting
