E-28Â Position Control / PG Deviation fault in Toshiba drive
E-28 Position Control / PG Deviation fault in Toshiba drive
Description For drives equipped with Encoder Feedback cards (PG) running in "Pulse Train" or "Position Control" mode. E-28 trips when the motor fails to reach the target position count within a certain window. It effectively means the servo-lock has slipped. Causes
1. Slipping Brake: The motor is trying to hold position, but the mechanical brake is dragging or slipping.
2. Gain Settings: The Position Loop Gain (Kp) is too low, making the motor response too soft to hold the load.
3. Mechanical Backlash: Slop in the gears causes the encoder to read movement that the drive didn't command.
4. Encoder Signal Loss: Intermittent missing pulses. Solution This is an advanced tuning issue.
Check the "Position Error Limit" parameter. If the tolerance is too tight (e.g., 10 pulses), normal mechanical flex might trip it. Widen the tolerance (e.g., 100 or 1000 pulses).
Increase the "Position Loop Gain" to make the motor stiffer and more responsive to error. Check the mechanical coupling between the motor and encoder.
Description For drives equipped with Encoder Feedback cards (PG) running in "Pulse Train" or "Position Control" mode. E-28 trips when the motor fails to reach the target position count within a certain window. It effectively means the servo-lock has slipped. Causes
1. Slipping Brake: The motor is trying to hold position, but the mechanical brake is dragging or slipping.
2. Gain Settings: The Position Loop Gain (Kp) is too low, making the motor response too soft to hold the load.
3. Mechanical Backlash: Slop in the gears causes the encoder to read movement that the drive didn't command.
4. Encoder Signal Loss: Intermittent missing pulses. Solution This is an advanced tuning issue.
Check the "Position Error Limit" parameter. If the tolerance is too tight (e.g., 10 pulses), normal mechanical flex might trip it. Widen the tolerance (e.g., 100 or 1000 pulses).
Increase the "Position Loop Gain" to make the motor stiffer and more responsive to error. Check the mechanical coupling between the motor and encoder.
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