C-Err Control Loop Error fault in Toshiba drive
C-Err Control Loop Error fault in Toshiba drive
Description C-Err (Control Error) occurs in high-performance Vector Control modes. The drive models the motor's expected behavior mathematically. If the actual current/speed deviates significantly from the model's prediction, and the drive cannot correct it by adjusting voltage, it trips C-Err. It essentially means, "I have lost control of the motor vector." Causes
1. Tuning Mismatch: The motor parameters (inductance/resistance) entered in the drive do not match the actual motor.
2. Load Oscillation: The load is surging or bouncing (e.g., a fan fighting a damper), causing current swings the PID loop cannot dampen.
3. Slipping: The motor is slipping significantly more than the vector algorithm expects (e.g., undersized motor).
4. Output Filter: An LC filter is installed between the drive and motor but the drive is in Vector mode (Vector mode generally requires direct connection). Solution 1. Perform a Rotational Auto-Tune. This allows the drive to learn the exact physics of the connected motor.
2. If you cannot tune, switch the control mode (Parameter Pt or F015) from "Sensorless Vector" (SLV) to "V/f Constant" (V/f). V/f mode is "dumb" (open loop) and does not care about vector modeling. It is much more robust against C-Err but offers less precise torque control.
3. If you must use Vector mode, adjust the "Speed Loop Gain" (Proportional and Integral). Lowering the gain (making the drive less aggressive) can stop the oscillations that lead to C-Err.
Description C-Err (Control Error) occurs in high-performance Vector Control modes. The drive models the motor's expected behavior mathematically. If the actual current/speed deviates significantly from the model's prediction, and the drive cannot correct it by adjusting voltage, it trips C-Err. It essentially means, "I have lost control of the motor vector." Causes
1. Tuning Mismatch: The motor parameters (inductance/resistance) entered in the drive do not match the actual motor.
2. Load Oscillation: The load is surging or bouncing (e.g., a fan fighting a damper), causing current swings the PID loop cannot dampen.
3. Slipping: The motor is slipping significantly more than the vector algorithm expects (e.g., undersized motor).
4. Output Filter: An LC filter is installed between the drive and motor but the drive is in Vector mode (Vector mode generally requires direct connection). Solution 1. Perform a Rotational Auto-Tune. This allows the drive to learn the exact physics of the connected motor.
2. If you cannot tune, switch the control mode (Parameter Pt or F015) from "Sensorless Vector" (SLV) to "V/f Constant" (V/f). V/f mode is "dumb" (open loop) and does not care about vector modeling. It is much more robust against C-Err but offers less precise torque control.
3. If you must use Vector mode, adjust the "Speed Loop Gain" (Proportional and Integral). Lowering the gain (making the drive less aggressive) can stop the oscillations that lead to C-Err.
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