E-24 Output Phase Loss fault in Toshiba drive
E-24 Output Phase Loss (Voltage Detection) fault in Toshiba drive
Description Some Toshiba drives use E-24 specifically for "Output Phase Loss detected by DC Bus Ripple/Voltage" rather than current. If one phase of the motor is disconnected, the back-EMF voltage signature changes. E-24 is often more sensitive than the standard "Output EPH" and works better at light loads. Causes
1. Loose Motor Wire: High resistance connection at the motor peckerhead.
2. Contactor Failure: An output contactor has burnt contacts on one pole.
3. Very Light Load: Running a motor with no load attached can sometimes create a voltage imbalance that mimics a phase loss. Solution Check all output connections.
If the application involves running a motor completely unloaded for test purposes, you may need to disable the "Output Phase Loss Selection" parameter (F605) temporarily to clear E-24. Remember to re-enable it before putting the machine into service, or you risk burning out the motor if a wire actually breaks later.
Description Some Toshiba drives use E-24 specifically for "Output Phase Loss detected by DC Bus Ripple/Voltage" rather than current. If one phase of the motor is disconnected, the back-EMF voltage signature changes. E-24 is often more sensitive than the standard "Output EPH" and works better at light loads. Causes
1. Loose Motor Wire: High resistance connection at the motor peckerhead.
2. Contactor Failure: An output contactor has burnt contacts on one pole.
3. Very Light Load: Running a motor with no load attached can sometimes create a voltage imbalance that mimics a phase loss. Solution Check all output connections.
If the application involves running a motor completely unloaded for test purposes, you may need to disable the "Output Phase Loss Selection" parameter (F605) temporarily to clear E-24. Remember to re-enable it before putting the machine into service, or you risk burning out the motor if a wire actually breaks later.
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