E-20Â Torque Boost / Tuning fault in Toshiba drive
E-20 Torque Boost / Tuning Fault fault in Toshiba drive
Description The E-20 fault is unique to Toshiba's vector control algorithms. It occurs when the "Torque Boost" parameter is set excessively high manually. Torque boost adds extra voltage at low frequencies to help get a heavy load moving. However, if you add too much voltage, the motor steel core saturates (cannot hold more magnetic flux), causing the current to spike wildly. The drive detects this saturation and trips E-20 to save the motor. Causes
1. Manual Tuning Error: The user manually increased the "Torque Boost" (F009 / vb) parameter to 10% or higher to fix a sluggish start.
2. Motor Mismatch: Using a small motor on a large drive; the default boost values of the large drive are too powerful for the small motor.
3. Stall Prevention: The stall prevention level is set incorrectly relative to the boost. Solution The fix is almost always in the parameters.
1. Lower the Torque Boost (vb) parameter. A standard AC motor rarely needs more than 2% to 6% boost. If you are at 15%, you are cooking the motor.
2. If you are having trouble starting the load, instead of cranking up voltage (which causes E-20), perform an "Auto-Tune." This allows the drive to measure the motor's resistance and automatically calculate the exact voltage needed to generate torque without saturation.
3. Switch control modes. If "Sensorless Vector" is giving E-20 trips on a weird motor, try switching to simple "V/f Constant" mode. This disables the complex calculations and provides a linear power output, which is often more stable for generic applications.
Description The E-20 fault is unique to Toshiba's vector control algorithms. It occurs when the "Torque Boost" parameter is set excessively high manually. Torque boost adds extra voltage at low frequencies to help get a heavy load moving. However, if you add too much voltage, the motor steel core saturates (cannot hold more magnetic flux), causing the current to spike wildly. The drive detects this saturation and trips E-20 to save the motor. Causes
1. Manual Tuning Error: The user manually increased the "Torque Boost" (F009 / vb) parameter to 10% or higher to fix a sluggish start.
2. Motor Mismatch: Using a small motor on a large drive; the default boost values of the large drive are too powerful for the small motor.
3. Stall Prevention: The stall prevention level is set incorrectly relative to the boost. Solution The fix is almost always in the parameters.
1. Lower the Torque Boost (vb) parameter. A standard AC motor rarely needs more than 2% to 6% boost. If you are at 15%, you are cooking the motor.
2. If you are having trouble starting the load, instead of cranking up voltage (which causes E-20), perform an "Auto-Tune." This allows the drive to measure the motor's resistance and automatically calculate the exact voltage needed to generate torque without saturation.
3. Switch control modes. If "Sensorless Vector" is giving E-20 trips on a weird motor, try switching to simple "V/f Constant" mode. This disables the complex calculations and provides a linear power output, which is often more stable for generic applications.
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