YASKAWA V1000 Quick Start Manual page 136

5.2 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.
Cause
The node setup terminal closed
during Run.
A Run command was issued while
the node setup function was active.
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.
136
Apply the tightening torque specified in this manual to fasten the terminals.
to Wire Size and 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.
• Check whether a Run command was accidentally entered via the terminals or
from a comm. option 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.
YASKAWA ELECTRIC TOEP C710606 47A YASKAWA AC Drive – V1000 Quick Start Guide
70.
Possible Solution
Possible Solution
Refer