8277

Category: Alarm

Cause

1. Drive U V W output phase loss or incorrect phase sequence
2. Open drive U V W output wiring or open encoder wiring
3. Mechanical factors cause motor stalling
4. Servo drive gain too low
5. Position command increment too large
6. Fault threshold 6065h is too small for the operating conditions
7. Servo drive / motor fault

Corrective action

1. Run the motor without a load and check the wiring. Rewire correctly or replace the cable.
2. Check the wiring. Rewire so that the servo motor power cable and drive power cable UVW correspond individually. Replace with a new cable if necessary and ensure secure connections.
3. Using the Inovance drive commissioning platform or panel display, confirm the operating command and motor speed (200B-01h). Operating command in position mode: 200B-0Eh (input position command counter). Operating command in speed mode: 200B-02h (speed command). Operating command in torque mode: 200B-03h (internal torque command). Confirm whether the operating command is not 0 while motor speed is 0 in the corresponding mode. Investigate mechanical causes.
4. Check servo drive position-loop and speed-loop gains: First gain: 2008-01h2008-03h. Second gain: 2008-04h2008-06h. Perform manual or automatic gain adjustment.
5. Position control mode: ◆CSP mode: Check gear ratio 6091-01h/6091-02h, determine the position command increment corresponding to one synchronization cycle, and convert it to speed information. Reduce the position command increment per synchronization cycle; add a position ramp when planning commands in the host controller. ◆PP mode: Check gear ratio 6091-01h/6091-02h and determine 6081h (profile velocity). Reduce 6081h or increase acceleration/deceleration ramps (6083h,6084h). ◆HM mode: Check gear ratio 6091-01h/6091-02h and determine 6099-01h and 6099-02h. Reduce 6099-01h and 6099-02h or increase the acceleration/deceleration ramp (609Ah). Reduce the gear ratio as appropriate.
6. Confirm whether position deviation fault threshold 6065h is set too low. Increase the 6065h setting.
7. Use the oscilloscope function of the Inovance drive commissioning platform to monitor operating waveforms: Position command, position feedback, speed command, torque command. If the position command is nonzero but position feedback remains zero, replace the servo drive / motor.