E-44Â PM Motor Initial Position fault in Toshiba drive
E-44 PM Motor Initial Position Error fault in Toshiba drive
Description When starting a Permanent Magnet (PM) motor without an encoder (Sensorless), the drive must inject a high-frequency signal to estimate where the magnet's North Pole is sitting (Initial Rotor Position Detection). If it fails to locate the rotor after several attempts, E-44 is triggered. Causes
1. Locked Rotor: The motor is mechanically jammed and cannot wiggle to respond to the test signal.
2. High Inertia: The load connected to the motor (e.g., a huge fan) is too heavy to be moved by the small test pulses.
3. Freewheeling: The motor is already spinning (windmilling) when the drive tries to start. The test signal cannot lock onto a moving target.
4. Long Cable: Excessive cable length dampens the high-frequency test signal. Solution If the motor is spinning (fan application), enable "Catch on Fly" or "Speed Search." This tells the drive to scan for speed before trying to determine position.
If the load is static but heavy, increase the "Inductive Sensing Current" or "Alignment Current" parameter. This gives the drive more "volume" to shout at the motor magnets.
Verify the motor is not physically jammed. If the rotor cannot align, the math fails.
Description When starting a Permanent Magnet (PM) motor without an encoder (Sensorless), the drive must inject a high-frequency signal to estimate where the magnet's North Pole is sitting (Initial Rotor Position Detection). If it fails to locate the rotor after several attempts, E-44 is triggered. Causes
1. Locked Rotor: The motor is mechanically jammed and cannot wiggle to respond to the test signal.
2. High Inertia: The load connected to the motor (e.g., a huge fan) is too heavy to be moved by the small test pulses.
3. Freewheeling: The motor is already spinning (windmilling) when the drive tries to start. The test signal cannot lock onto a moving target.
4. Long Cable: Excessive cable length dampens the high-frequency test signal. Solution If the motor is spinning (fan application), enable "Catch on Fly" or "Speed Search." This tells the drive to scan for speed before trying to determine position.
If the load is static but heavy, increase the "Inductive Sensing Current" or "Alignment Current" parameter. This gives the drive more "volume" to shout at the motor magnets.
Verify the motor is not physically jammed. If the rotor cannot align, the math fails.
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