YASKAWA V1000 Series Technical Manual page 232

6.4 Fault Detection
Cause
Motor insulation is damaged.
A damaged motor cable is creating a short circuit.
The leakage current at the drive output is too high.
The drive started to run during Current Offset Fault or while
coasting to a stop.
Hardware problem.
LED Operator Display
Cause
The output cable is disconnected.
The motor winding is damaged.
The output terminal is loose.
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.
LED Operator Display
Cause
Phase loss has occurred on the output side of the drive.
Terminal wires on the output side of the drive are loose.
No signal displays from the gate driver board.
Motor impedance or motor phases are uneven.
LED 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.
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.
Drive fails to operate properly due to noise interference.
Overexcitation gain is set too high.
Run command applied while motor was coasting.
The wrong motor code has been entered for PM Open Loop
Vector (Yaskawa motors only).
232
• Check the insulation resistance of the motor.
• Replace the motor.
• Check the motor cable.
• Remove the short circuit and turn the power back on.
• Check the resistance between the cable and the ground terminal
• Replace the cable.
• Reduce the carrier frequency.
• Reduce the amount of stray capacitance.
• The value set exceeds the allowable setting range while the drive automatically adjusts the current offset (this happens only attempting
to restart a PM motor that is coasting to stop).
• Enable Speed Search at start (b3-01 = 1).
• Perform Speed Search 1 or 2 (H1-xx = 61 or 62) via one of the external terminals. Note: Speed Search 1 and 2 are the same when
using PM OLV.
• Replace the drive.
Output Phase Loss
LF • Phase loss on the output side of the drive.
• Phase Loss Detection is enabled when L8-07 is set to "1" or "2".
• Check for wiring errors and ensure the output cable is connected properly.
• Correct the wiring.
• Check the resistance between motor lines.
• Replace the motor if the winding is damaged.
• Apply the tightening torque specified in this manual to fasten the terminals.
46.
Check the drive and motor capacities.
Replace the drive.
The drive being used cannot operate a single phase motor.
Output current imbalance
LF2
One or more of the phases in the output current is 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.
46.
Replace the drive. Contact Yaskawa for assistance.
• Measure the line-to-line resistance for each motor phase. Ensure all values are the same.
• Replace the motor. Contact Yaskawa for assistance.
Overcurrent
oC
Drive sensors have 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 power the drive back up.
• 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 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.
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, -05, -07)
• Increase the S-curve characteristics (C2-01 through C2-04)
• 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 that the MC is not tripped while the drive is outputting current.
• Check the ratios between the voltage and frequency.
• Set parameter E1-04 through E1-10 appropriately. Set E3-04 through E3-10 when using a second motor.
• 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.
• 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.
• Check if fault occurs simultaneously to overexcitation function operation.
• Consider motor flux saturation and reduce the value of n3-13 (Overexcitation Deceleration Gain).
• Enable Speed Search at start (b3-01 = "1").
• Program the Speed Search command input through one of the multi-function contact input terminals (H1-oo = "61" or "62").
Enter the correct motor code to E5-01 to indicate that a PM motor is connected.
Possible Solution
.
Fault Name
Possible Solution
Fault Name
Possible Solution
Refer to Wire Size and Torque Specifications on page
Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
Refer to Wire Size and Torque Specifications on page
.