YASKAWA Z1000 Technical Manual page 237

HOA Keypad Display
The rated current of the motor being used is less
than 5% of the drive rated current
An output transistor is damaged
A single-phase motor is being used
HOA Keypad Display
LF2
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
HOA Keypad Display
nSE
Cause
The node setup terminal closed during run
A Run command was issued while the node setup
function was active
HOA Keypad Display
oC
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
YASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual
Check the drive and motor capacities.
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.
The drive cannot operate a single phase motor.
Output Current Imbalance
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.
and Tightening Torque Specifications on page 62
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.
Node Setup Error
A terminal assigned to the node setup function closed during run.
Stop the drive when using the node setup function.
Overcurrent
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)
• Increase the S-curve characteristics (C2-01 and C2-02)
• 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 the MC does not trip while the drive is outputting current.
• Check the ratios between the voltage and frequency.
• 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.
6.4 Fault Detection
Fault Name
Fault Name
Possible Solution
for details.
Fault Name
Possible Solution
Fault Name
Possible Solution
Refer to Wire Gauge
.
6
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