Terminal wires on the output sideof the drive are loose. Apply the tightening torque specified in this manual to fasten the terminals. Referto Wire Size and Torque Specifications on page 70.No signal displays from the gatedriver board. Replace the drive. Contact Yaskawa for assistance.Motor impedance or motor phasesare uneven.• Measure the line-to-line resistance for each motor phase. Ensure all values arethe same.• Replace the motor. Contact Yaskawa for assistance.nSE Node Setup ErrorA terminal assigned to the node setup function closed during Run.Cause Possible SolutionThe node setup terminal closedduring Run. • Check whether a Run command was accidentally entered via the terminals orfrom a comm. option unit.• Turn off the Run command when using the node setup function.A Run command was issued whilethe node setup function was active.oCOvercurrentDrive sensors have detected an output current greater than the specifiedovercurrent level.Cause Possible SolutionThe motor has been damaged dueto overheating or the motorinsulation is damaged.• Check the insulation resistance.• Replace the motor.One of the motor cables has shortedout or there is a grounding problem.• 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.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 therated 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 alarger drive.The acceleration or decelerationtimes are too short.Calculate the torque needed during acceleration relative to the load inertia and thespecified 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 aspecialized motor or a motor largerthan the maximum size allowed.• Check the motor capacity.• Ensure that the rated capacity of the drive is greater than or equal to the capacityrating found on the motor nameplate.Magnetic contactor (MC) on theoutput side of the drive has turnedon or off.Set up the operation sequence so that the MC is not tripped while the drive isoutputting current.5.2 Fault Detection136 YASKAWA ELECTRIC TOEP C710606 47A YASKAWA AC Drive – V1000 Quick Start Guide