Yaskawa AC Drive P1000 Bypass Technical Manual User Manual
Page 183
HOA Keypad Display
Fault Name
LF
Output Phase Loss
• Phase loss on the output side of the drive.
• Setting L8-07 to 1 or 2 enables Phase Loss Detection.
Cause
Possible Solution
The output cable is disconnected
• Check for wiring errors and properly connect the output cable.
• Correct the wiring.
The motor winding is damaged
• Check the resistance between motor lines.
• Replace the motor if the winding is damaged.
The output terminal is loose
• Apply the tightening torque specified in this manual to fasten the terminals.
and Tightening Torque Specifications on page 43
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.
HOA Keypad Display
Fault Name
LF2
Output Current Imbalance
One or more of the phases in the output current are lost.
Cause
Possible Solution
Phase loss has occurred on the output side of the
drive
• Check for faulty wiring or poor connections on the output side of the drive.
• Correct the wiring.
Terminal wires are loose on the output side of the
drive
Apply the tightening torque specified in this manual to fasten the terminals.
and Tightening Torque Specifications on page 43
for details.
The output circuit 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.
Motor impedance or motor phases are uneven
• Measure the line-to-line resistance for each motor phase. Ensure all values match.
• Replace the motor.
HOA Keypad 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
HOA Keypad 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.
6.4 Fault Detection
YASKAWA SIEP YAIP1B 01A YASKAWA AC Drive – P1000 Bypass Technical Manual
183
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Diagnostics & Troubleshooting