E-46Â PM Motor Step-Out fault in Toshiba drive
E-46 PM Motor Step-Out Error fault in Toshiba drive
Description This fault is specific to **Permanent Magnet (PM)** synchronous motors. Unlike induction motors, PM motors must rotate in perfect synchronization with the rotating magnetic field generated by the drive. If the rotor falls behind (slips) or jumps ahead due to load changes, the "lock" is broken, and torque drops to zero instantly. This is called "Step-Out." The drive detects this loss of synchronization via back-EMF analysis and trips E-46. Causes
1. Shock Load: A sudden jam or heavy impact caused the rotor to physically stop while the magnetic field kept spinning.
2. Incorrect Tuning: The Inductance (Ld/Lq) or Back-EMF constant programmed in the drive does not match the specific PM motor being used.
3. Undersized Drive: The drive cannot supply enough current to maintain the magnetic lock during acceleration.
4. Start-up Load: Trying to start a PM motor against a high inertia load without using a "Heavy Duty" start mode. Solution E-46 requires tuning optimization. First, perform an "Auto-Tune" specifically for PM motors. Ensure the motor nameplate data (Voltage, Amps, Rated Speed) is entered precisely. PM motors are unforgiving of bad data.
Increase the "Step-Out Detection Time" to allow for momentary slips during load transients. However, do not increase it too much, or the motor will stall and vibrate violently.
If the fault occurs at startup, increase the "PM Start Current" or "Initial alignment current." PM motors often need a strong injection of DC current to align the rotor magnets before rotation begins. If the load is very dynamic (like a compressor), you may need to switch from "Sensorless PM" mode to "Feedback PM" mode using a physical encoder to guarantee synchronization.
Description This fault is specific to **Permanent Magnet (PM)** synchronous motors. Unlike induction motors, PM motors must rotate in perfect synchronization with the rotating magnetic field generated by the drive. If the rotor falls behind (slips) or jumps ahead due to load changes, the "lock" is broken, and torque drops to zero instantly. This is called "Step-Out." The drive detects this loss of synchronization via back-EMF analysis and trips E-46. Causes
1. Shock Load: A sudden jam or heavy impact caused the rotor to physically stop while the magnetic field kept spinning.
2. Incorrect Tuning: The Inductance (Ld/Lq) or Back-EMF constant programmed in the drive does not match the specific PM motor being used.
3. Undersized Drive: The drive cannot supply enough current to maintain the magnetic lock during acceleration.
4. Start-up Load: Trying to start a PM motor against a high inertia load without using a "Heavy Duty" start mode. Solution E-46 requires tuning optimization. First, perform an "Auto-Tune" specifically for PM motors. Ensure the motor nameplate data (Voltage, Amps, Rated Speed) is entered precisely. PM motors are unforgiving of bad data.
Increase the "Step-Out Detection Time" to allow for momentary slips during load transients. However, do not increase it too much, or the motor will stall and vibrate violently.
If the fault occurs at startup, increase the "PM Start Current" or "Initial alignment current." PM motors often need a strong injection of DC current to align the rotor magnets before rotation begins. If the load is very dynamic (like a compressor), you may need to switch from "Sensorless PM" mode to "Feedback PM" mode using a physical encoder to guarantee synchronization.
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