YASKAWA V1000 Technical Manual page 258

6.4 Fault Detection
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 node setup terminal closed during Run. • Check whether a Run command was accidentally entered via the terminals or from a comm. option
A Run command was issued while the node
setup function was active.
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).
The motor control method and motor do not
match.
The motor cable is too long
258
Apply the tightening torque specified in this manual to fasten the terminals.
Torque Specifications on page
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.
Node Setup Error
nSE
A terminal assigned to the node setup function closed during Run.
unit.
• Turn off the Run command 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.
• 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.
Check which motor control method the drive is set to (A1-02).
• For IM motors, set A1-02 = "0" or "2".
• For PM motors, set A1-02 = "5".
Use a larger drive.
64.
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
Refer to Wire Size and