YASKAWA A1000

6.4 Fault Detection
342 YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Digital Operator Display Fault Name
<3>
LSo
LSo Fault
Pull-out has been detected at low speed.
Cause Possible Solution
The incorrect motor code has been entered.
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.
The load is too heavy.
Reduce the load.
Replace the drive with a larger model.
The drive incorrectly detected the position of the motor
poles.
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.
Values set to parameters L8-93, L8-94, and L8-95 are
incorrect.
Increase the value set to L8-93.
Increase the value set to L8-94.
Increase the value set to L8-95.
Digital Operator 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.
Digital Operator Display Fault Name
oC
Overcurrent
Dri
ve sensors have detected an output current greater than the specified overcurrent level.
Cause Possible Solution
The motor has been damaged due to overheating or the
m
otor insulation is damaged.
• Check the insulation resistance.
• Replace the motor.
One of the motor cables has shorted out or there is a
groun
ding problem.
• Check the motor cables.
• Remove the short circuit and power the drive back up.
• Check the resistance between the mot
or cables and the ground terminal .
• Replace damaged cables.
The drive is damaged.
• 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 neares
t YASKAWA sales office.
The load is too heavy.
• 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 curr
ent level or switch to a larger drive.
The acceleration or deceleration times are too short.
Cal
culate 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.
The drive is attempting to operate a specialized motor or
a
motor larger than the maximum size allowed.
• Check the motor capacity.
• Ensure that the rated capacity of the drive is greater than or equ
al to the capacity rating found on the motor nameplate.
Magnetic contactor (MC) on the output side of the drive
has t
urned on or off.
Set up the operation sequence so that the MC is not tripped while the drive is outputting current.
V/f setting is not operating as expected.
• Check the ratios between t
he 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.
Excessive torque compensation.
• Check the amount of torque compensation.
• Reduce the torque compensation gain (C4-01)
until there is no speed loss and less current.
Drive fails to operate properly due t
o electrical signal
interference.
• 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.
Overexcitation gain is set too high.
• Check if fault occurs si
multaneously to overexcitation function operation.
• Consider motor flux saturation and reduce the value of n3-13 (Overexcitation Deceleration Gain).
Run command applied while motor was coasting.
• 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).
The wrong motor code has been entered for PM Open
Loo
p Vector (YASKAWA motors only) or the motor
data are wrong.
• 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.
The overcurrent level has exceeded the val
ue set to L8-
27. (PM control modes)
Correct the value set to overcurrent detection gain (L8-27).
The motor control method and motor do not match.
• Check which motor control method the driv
e 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”.
The drives rated output current is too small. Use a larger drive.
Digital Operator Display Fault Name
oFA00
Option Card Connection Error at Option Port CN5-A
Op
tion compatibility error
Cause Possible Solution
The option card installed into port CN5-A is
in
compatible with the drive.
Check if the drive supports the option card that you are attempting to install. Contact YASKAWA for assistance.
A PG option card is connected to option port CN5-A PG option boards are supported by option ports CN5-B and CN5-C only. Place the PG option card into the correct option port.