E-21Â Motor Tuning Data Error fault in Toshiba drive
E-21 Motor Tuning Data Error fault in Toshiba drive
Description E-21 occurs when the mathematical constants calculated during an Auto-Tune are outside the allowable range for the drive. For example, if you tune a 1HP motor on a 50HP drive, the measured resistance will be so high (relative to the drive's expectation) that the software assumes the measurement was a glitch. Causes
1. Drive/Motor Mismatch: The motor is too small (less than 25% of drive rating) or too large.
2. Bad Motor Connections: High resistance in a loose wire splice caused the measured resistance to spike.
3. Wrong Base Data: User entered "230V" for a "460V" motor before starting the tune.
4. Long Cables: Tuning with 500ft of cable adds impedance that skews the inductance calculation. Solution Verify the manual motor parameters (Nameplate Volts, Amps, Hz) are correct.
If the motor is very small compared to the drive, you cannot use Vector Control. Switch the Control Mode (Pt) to "V/f Constant." This mode does not require tuning data and will eliminate E-21.
If the motor size is correct, check for loose wiring. If tuning fails repeatedly, perform a "Stationary Tune" instead of a "Rotational Tune," or manually enter the motor data from the datasheet if available (Resistance, Inductance).
Description E-21 occurs when the mathematical constants calculated during an Auto-Tune are outside the allowable range for the drive. For example, if you tune a 1HP motor on a 50HP drive, the measured resistance will be so high (relative to the drive's expectation) that the software assumes the measurement was a glitch. Causes
1. Drive/Motor Mismatch: The motor is too small (less than 25% of drive rating) or too large.
2. Bad Motor Connections: High resistance in a loose wire splice caused the measured resistance to spike.
3. Wrong Base Data: User entered "230V" for a "460V" motor before starting the tune.
4. Long Cables: Tuning with 500ft of cable adds impedance that skews the inductance calculation. Solution Verify the manual motor parameters (Nameplate Volts, Amps, Hz) are correct.
If the motor is very small compared to the drive, you cannot use Vector Control. Switch the Control Mode (Pt) to "V/f Constant." This mode does not require tuning data and will eliminate E-21.
If the motor size is correct, check for loose wiring. If tuning fails repeatedly, perform a "Stationary Tune" instead of a "Rotational Tune," or manually enter the motor data from the datasheet if available (Resistance, Inductance).
Comments
Post a Comment