Yaskawa CIMR-PUxA - Manual (Page 138)

The rated current of the motor being used is
less than 5% of the drive rated current
Check the drive and motor capacities.
An output transistor is damaged
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.
A single-phase motor is being used The drive cannot operate a single phase motor.
Digital Operator Display Fault Name
<1>
LF3
Power Unit Output Phase Loss 3
• Phase loss occurred on the output side
• Setting L8-78 to 1 enables Power Unit Output Phase Loss Protection
Cause Possible Solution
The gate drive board in the power unit is
damaged.
Cycle the power supply. If the fault continues to occur, replace the gate drive board or the drive. Contact
Yaskawa or a Yaskawa representative for instructions on replacing the gate drive board.
Cable to the current detection circuit in the
power unit is damaged or not connected
properly.
Check for incorrect wiring and correct any wiring mistakes.
Cable between the output rector and the power
unit is loose or not connected.
Contact Yaskawa or your nearest sales representative for instructions.
<1> Detected in models 4A0930 and 4A1200.
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.
• 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).
• 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.
• 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.
5.2 Fault Detection
138 YASKAWA ELECTRIC TOEP YAIP1U 01B YASKAWA AC Drive - P1000 Quick Start Guide