E-25Â Current Detector Error fault in Toshiba drive
E-25 Current Detector Error fault in Toshiba drive
Description The drive uses Hall Effect sensors (CTs) on the output phases (U, V, W) to measure the current going to the motor. E-25 indicates that the output of these sensors is drifting or invalid. For example, if the drive is in a "Stop" state, the sensors should read 0 Amps. If a sensor reports 5 Amps while the drive is stopped, the CPU flags E-25 because the sensor is clearly lying. Causes
1. Sensor Drift: The Hall Effect sensor component has degraded over time (thermal drift).
2. DC Magnetization: The sensor has become permanently magnetized due to a previous massive short circuit event.
3. Auxiliary Power: The +/- 15V power supply on the main board that feeds the sensors is failing.
4. Disconnected Plug: The cable connecting the CT (Current Transformer) to the main board is loose. Solution This is almost exclusively an internal hardware issue. There are no parameters to fix a broken sensor.
Open the drive (after proper discharge). Locate the current sensors (usually doughnut-shaped rings around the output busbars). Check the wire harness coming from them. Is it plugged in securely?
Some large Toshiba drives allow for a "Current Sensor Auto-Zero" or calibration via a maintenance mode, but this is rare. Usually, if E-25 appears, you must replace the sensor itself (if it is a modular part) or the entire power board (if soldered).
Description The drive uses Hall Effect sensors (CTs) on the output phases (U, V, W) to measure the current going to the motor. E-25 indicates that the output of these sensors is drifting or invalid. For example, if the drive is in a "Stop" state, the sensors should read 0 Amps. If a sensor reports 5 Amps while the drive is stopped, the CPU flags E-25 because the sensor is clearly lying. Causes
1. Sensor Drift: The Hall Effect sensor component has degraded over time (thermal drift).
2. DC Magnetization: The sensor has become permanently magnetized due to a previous massive short circuit event.
3. Auxiliary Power: The +/- 15V power supply on the main board that feeds the sensors is failing.
4. Disconnected Plug: The cable connecting the CT (Current Transformer) to the main board is loose. Solution This is almost exclusively an internal hardware issue. There are no parameters to fix a broken sensor.
Open the drive (after proper discharge). Locate the current sensors (usually doughnut-shaped rings around the output busbars). Check the wire harness coming from them. Is it plugged in securely?
Some large Toshiba drives allow for a "Current Sensor Auto-Zero" or calibration via a maintenance mode, but this is rare. Usually, if E-25 appears, you must replace the sensor itself (if it is a modular part) or the entire power board (if soldered).
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