E-14Â Ground fault in Toshiba drive
E-14 Ground Fault (Startup Detection) fault in Toshiba drive
Description While the "EF" fault (Part 1) detects leakage during operation, E-14 is a specific diagnostic test run by the CPU immediately upon receiving a "Run" command but *before* releasing the brake or ramping up frequency. The drive injects a small voltage pulse to check if any output phase has a low-impedance path to earth. If it detects leakage, it prevents the start. Causes
1. Cable Insulation: Small nick in the motor cable conduit that only leaks when energized.
2. Wet Motor: Condensation inside the motor windings (common in pumps after a weekend shutdown).
3. Filter Leakage: An EMC/RFI filter is installed on the output side (which is incorrect) and leaking current to ground.
4. Drive Sensing Circuit: The internal Zero Phase Current Transformer (ZCT) is malfunctioning. Solution Disconnect the motor leads (U, V, W) at the drive end. Attempt to run the drive empty. If E-14 clears, the fault is in the field.
Megger the motor and cables at 500V or 1000V. A reading below 10 Megohms is suspicious; below 1 Megohm is a failure. If the motor is wet, you may be able to dry it out using heaters.
If the fault persists with no wires attached, check the "Ground Fault Detection" parameter (often F605). If you are in an emergency and the leakage is capacitive (not a dead short), you *might* be able to disable detection temporarily to keep running, but this risks destroying the drive if a real short develops.
Description While the "EF" fault (Part 1) detects leakage during operation, E-14 is a specific diagnostic test run by the CPU immediately upon receiving a "Run" command but *before* releasing the brake or ramping up frequency. The drive injects a small voltage pulse to check if any output phase has a low-impedance path to earth. If it detects leakage, it prevents the start. Causes
1. Cable Insulation: Small nick in the motor cable conduit that only leaks when energized.
2. Wet Motor: Condensation inside the motor windings (common in pumps after a weekend shutdown).
3. Filter Leakage: An EMC/RFI filter is installed on the output side (which is incorrect) and leaking current to ground.
4. Drive Sensing Circuit: The internal Zero Phase Current Transformer (ZCT) is malfunctioning. Solution Disconnect the motor leads (U, V, W) at the drive end. Attempt to run the drive empty. If E-14 clears, the fault is in the field.
Megger the motor and cables at 500V or 1000V. A reading below 10 Megohms is suspicious; below 1 Megohm is a failure. If the motor is wet, you may be able to dry it out using heaters.
If the fault persists with no wires attached, check the "Ground Fault Detection" parameter (often F605). If you are in an emergency and the leakage is capacitive (not a dead short), you *might* be able to disable detection temporarily to keep running, but this risks destroying the drive if a real short develops.
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