u Output Frequency is Not as High as Frequency ReferenceCause Possible SolutionsFrequency reference is set within the range of the JumpFrequency.• Adjust the parameters used for the Jump Frequency function (d3-01, d3-02, d3-03).• Enabling the Jump Frequency prevents the drive from outputting the frequencies specified inthe Jump range.Upper limit for the frequency reference has beenexceeded.• Set the maximum output frequency and the upper limit for the frequency reference to moreappropriate values (E1-04, d2-01).• The following calculation yields the upper value for the output frequency:E1-04 x d2-01 / 100Large load triggered Stall Prevention function duringacceleration.• Reduce the load.• Adjust the Stall Prevention level during acceleration (L3-02).u Sound from MotorCause Possible SolutionsExceeded 110% of the rated output current of the drivewhile operating at low speeds.• If the output current rises too high at low speeds, the carrier frequency is automatically reducedand causes a whining or buzzing sound.• If the sound is coming from the motor, disable carrier frequency derating (L8-38 = 0).• Disabling the automatic carrier frequency derating increases the chances of an overload fault(oL2). Switch to a larger capacity motor if oL2 faults occur too frequently.u Unstable Motor Speed when Using PMCause Possible SolutionsDrive is attempting to operate the motor beyond thespeed control range listed in the specifications. Check the speed control range and adjust the speed accordingly.Drive is attempting to operate the motor at 5% or lessof the speed reference value. Use an alternative motor.Motor hunting occurs. Refer to Motor Performance Fine-Tuning on page 194 for details.Hunting occurs at start. Increase the S-curve time at the start of acceleration (C2-01).Too much current is flowing through the drive.• Use alternative motor if the drive is attempting to operate the motor at 5% or less of the speedreference value.• For special-purpose motors, enter the correct data to all E5 parameters according to the testreport provided for the motor.u Motor Does Not Restart after Power LossCause Possible SolutionsThe Run command was not issued again when powerwas restored.• Check the sequence and wiring that has been set up to enter the Run command.• A relay should be set up to make sure the Run command remains enabled throughout any powerloss.The relay that is supposed to maintain the Runcommand has been switched off. Check wiring and circuitry for the relay intended to keep the Run command enabled.5.10 Troubleshooting without Fault DisplayYASKAWA TOEP YAIZ1U 03B YASKAWA AC Drive – Z1000 User Manual 2415 Troubleshooting
