What to do if Nidec DC Drives motor goes into current limit following drive enable?
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smithcourtneyAug 15, 2025
If your Nidec DC drive motor goes into current limit after enabling, ensure the motor data and symmetrical current limit are correctly set up. For PM motors in RFC-S mode, perform an autotune to derive the correct encoder phase angle. Check the position feedback, motor connections, and for any motor connection faults. Also, verify the motor rated speed 'slip' if operating in open loop vector (RFC-A), as an incorrect setting can limit output torque.
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Mary MooreAug 18, 2025
Why Nidec DC Drives elevator operating speed or direction is incorrect?
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Robert BoothAug 18, 2025
If your Nidec DC Drives elevator operates at an incorrect speed or direction, verify that the mechanical data for the elevator system, including nominal speed (m/s), sheave diameter, roping, gear ratio, and maximum speed, has been entered correctly. Also, ensure the elevator operating speeds (V1 through V4) are appropriately set up in parameters G01 through G04. Check the direction input configuration in Control Input Mode (H11) and confirm that the correct direction is selected. For PM motors operating in RFC-S mode, complete an encoder phase angle test before operation. Finally, inspect both the motor power connections and the encoder control connections for correct rotation.
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lchangAug 22, 2025
What to do if Nidec DC Drives elevator fails to reach contract speed?
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William AllenAug 22, 2025
If the Nidec DC Drives elevator fails to reach the contract speed, first check if the drive is operating in current limit by monitoring Current Limit Reached (L15). If using open loop vector (RFC-A), verify the motor rated speed “slip” is correct. Ensure sufficient voltage is available from the AC power supply, accounting for any voltage drops. For PM motors operating in RFC-S, the motor may be reaching its maximum speed or entering flux weakening.
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melissa61Aug 25, 2025
How to fix unable to carry out autotune, motor does not rotate on Nidec DC Drives?
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Glen AdamsAug 26, 2025
If you're unable to carry out autotune on your Nidec DC Drives and the motor doesn't rotate, verify that the output motor contactors are closing during the static or rotating autotune. Also, ensure the motor brake is releasing during rotating autotune. Check the motor nameplate data and parameter settings in parameters B01 through B10, and confirm the correct operating mode is selected for the motor type (Induction or PM). Verify encoder data and parameter settings in parameters C01 through C08 for closed-loop operation. Ensure the enable signal is connected to control terminal 31 of the drive. A rotating autotune cannot be performed if there is insufficient space for the elevator car to move or if the system is unbalanced due to load.
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Lisa FrancisAug 28, 2025
Why is there vibration on brake release with Nidec DC Drives?
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Kevin WheelerAug 28, 2025
If you experience vibration on brake release with your Nidec DC Drives, it may be due to a high speed loop integral gain. Reducing this gain may resolve the issue. Also, a high Start lock P gain prior to and during brake release can cause vibration during start. Check the position feedback in closed loop operation.
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Lisa McphersonAug 31, 2025
Why is there vibration during operation of Nidec DC Drives?
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daviselizabethSep 1, 2025
If you experience vibration during operation with Nidec DC Drives, it could be due to incorrectly set speed loop I and P gains. Also, check the position feedback in closed loop operation. The current control loop gains calculated from the autotune may be high for the given motor. These can be manually adjusted, or a current control loop filter can be implemented.
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Michael MullinsSep 4, 2025
What to do if Nidec DC Drives roll back during start?
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Amy HudsonSep 4, 2025
If your Nidec DC Drives experience rollback during start, increase the start speed loop I gain. If the start speed loop I gain is limited due to a low-resolution encoder or noise on the position feedback, enable the position lock for start. If a load cell is available, connect it to the drive using analog input 2 to provide torque feed forward during start.
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Richard AllenSep 7, 2025
Why is there overshoot during change in speed in Nidec DC Drives?
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Anthony HoweSep 7, 2025
If you are experiencing overshoot during a change in speed with your Nidec DC Drives, it may be due to the speed control loop proportional gain being too low.
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johncastroSep 12, 2025
What causes acoustic noise from motor/ brake arrangement during start / stop of Nidec DC Drives?
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ethan01Sep 12, 2025
Acoustic noise from the motor or brake arrangement during start/stop on your Nidec DC Drives is caused by the current limit ramp time. During the stop and following brake apply, the drive ramps the current limit down, releasing the load slowly onto the mechanical brake before disabling the drive.
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