YASKAWA A1000 Technical Manual page 342

6.4 Fault Detection
Digital Operator Display
<3>
Cause
The incorrect motor code has been entered.
The load is too heavy.
The drive incorrectly detected the position of the motor
poles.
Values set to parameters L8-93, L8-94, and L8-95 are
incorrect.
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 drive is damaged.
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 electrical signal
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) or the motor
data are wrong.
The overcurrent level has exceeded the value set to L8-
27. (PM control modes)
The motor control method and motor do not match.
The drives rated output current is too small.
Digital Operator Display
Cause
The option card installed into port CN5-A is
incompatible with the drive.
A PG option card is connected to option port CN5-A
342
LSo Fault
LSo
Pull-out has been detected at low speed.
Enter the correct motor code for the PM motor being used into E5-01.
For special-purpose motors, enter the correct data to all E5 parameters according to the test report provided for the motor.
Reduce the load.
Replace the drive with a larger model.
Make sure some external force is not rotating the motor at start.
Enable Speed Search Selection at start. (b3-01 = 1)
If the value displayed in U6-57 is lower than 819, then set the polarity judge current (n8-84) higher than the default value.
Increase the value set to L8-93.
Increase the value set to L8-94.
Increase the value set to L8-95.
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 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.
• Check the drive output side short circuit for broken output transistor.
B1 and U/V/W
- (negative) and U/V/W
• Contact your YASKAWA representative or nearest YASKAWA sales office.
• 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 (E3-04 through E3-10 for motor 2).
• 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 electrical signal interference.
• Review the section on handling electrical signal 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- = 61 or 62).
• Enter the correct motor code to E5-01.
• If a non-YASKAWA PM motor is used, enter "FFFF" to E5-01. Set the correct motor data to the E5- parameters or perform
Auto-Tuning.
Correct the value set to overcurrent detection gain (L8-27).
• Check which motor control method the drive is set to (A1-02).
• For IM motors, set A1-02 = "0", "1", "2", or "3".
• For PM motors, set A1-02 = "5", "6" or "7".
Use a larger drive.
Option Card Connection Error at Option Port CN5-A
oFA00
Option compatibility error
Check if the drive supports the option card that you are attempting to install. Contact YASKAWA for assistance.
PG option boards are supported by option ports CN5-B and CN5-C only. Place the PG option card into the correct option port.
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Possible Solution
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Possible Solution
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YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
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