n PID output faultCause Possible SolutionsNo PID feedback input.• Check the multi-function analog input terminal settings.• Set multi-function analog input terminal A1 or A2 for PID feedback (H3-02 or H3-10 =“B”).• A signal input to the terminal selection for PID feedback is necessary.• Check the connection of the feedback signal.• Check the various PID-related parameter settings.• No PID feedback input to the terminal causes the value detected to be 0, causing a PID faultand the drive to operate at max frequency.The level of detection and the target value do notcorrespond with each other.• PID control keeps the difference between target and detection values at 0. Set the input levelfor the values relative to one another.• Use analog input gains H3-03/11 to adjust PID target and feedback signal scaling.Reverse drive output frequency and speed detection.When output frequency rises, the sensor detects aspeed decrease. Set PID output for reverse characteristics (b5-09 = “1”).n Insufficient Motor TorqueCause Possible SolutionsAuto-Tuning has not yet been performed (requiredfor OLV Control). Perform Auto-Tuning.The control mode was changed after performingAuto-Tuning. Perform Auto-Tuning again.Only Line-to-Line Resistance Auto-Tuning wasperformed. Perform Rotational Auto-Tuning.n Motor Rotates After the Drive Output is Shut OffCause Possible SolutionsLow DC Injection Braking and the drive cannotdecelerate properly.• Adjust the DC Injection braking settings.• Increase the value of b2-02 (DC Injection Braking Current).• Increase the b2-04 (DC Injection Braking Time at Stop).n ov or Speed Loss Occurs When Starting into a Rotating LoadCause Possible SolutionsThe load is already rotating when the drive is tryingto start it.• Stop the motor using DC Injection braking. Restart the motor.• Increase the value of b2-03 (DC Injection Braking Time at start).• Enable Speed Search at start (b3-01 = “1”).• Set a multi-function input terminal for external Speed Search command (H1-oo=“61” or“62” during restart).n Output Frequency is not as High as Frequency ReferenceCause Possible SolutionsFrequency reference is set within the range of theJump Frequency.• 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 specifiedin the Jump Frequency 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).n Buzzing Sound from Motor at 2 kHzCause Possible SolutionsExceeded 110% of the rated output current of thedrive while operating at low speeds.• If the output current rises too high at low speeds, the carrier frequency automatically reducesand 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.6.9 Troubleshooting without Fault Display286 YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
