YASKAWA P1000 Technical Manual page 300

6.4 Fault Detection
Digital Operator Display
Cause
Phase loss has occurred on the output side of
the drive
Terminal wires are loose on the output side of
the drive
The output circuit is damaged
Motor impedance or motor phases are uneven
Digital Operator Display
<1>
Cause
The gate drive board in the power unit is
damaged.
Cable to the current detection circuit in the
power unit is damaged or not connected
properly.
Cable between the output rector and the power
unit is loose or not connected.
<1> Detected in models 4A0930 and 4A1200.
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
300
Output Current Imbalance
LF2
One or more of the phases in the output current are lost.
• Check for faulty wiring or poor connections on the output side of the drive.
• Correct the wiring.
Apply the tightening torque specified in this manual to fasten the terminals.
Gauges and Tightening Torques on page 85
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 match.
• Replace the motor.
Power Unit Output Phase Loss 3
LF3
• Phase loss occurred on the output side
• Setting L8-78 to 1 enables Power Unit Output Phase Loss Protection
Cycle the power supply.
continues to occur, replace the gate drive board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the gate drive board.
Check for incorrect wiring and correct any wiring mistakes.
Contact Yaskawa or your nearest sales representative for instructions.
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 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.
Fault Name
Possible Solution
for details.
Fault Name
Possible Solution
Refer to Diagnosing and Resetting Faults on page 327
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
Refer to Main Circuit Wire
for details. If the fault
.