Dry / ULÂ Dry Run / Underload Protection fault in Toshiba drive
Dry / UL Dry Run / Underload Protection fault in Toshiba drive
Description Common in the Toshiba "P9" or "Flow" series drives. This is an application-specific trip indicating the pump is running dry (no fluid). It is triggered when the current drops below a set threshold (e.g., 60% of FLA) while running at full speed. Running a pump dry destroys the seals and impellers. Causes
1. Empty Tank: The supply tank is empty.
2. Closed Valve: The suction valve is closed.
3. Vapor Lock: Air is trapped in the pump casing.
4. Broken Shaft: The motor is spinning but the pump impeller is not connected. Solution Do not reset blindly. Check the fluid level. Bleed air from the pump casing.
If the tank is full and the pump is pumping, the "Dry Run Detection Level" parameter is set too high (too sensitive). Lower the detection threshold (Amps or %).
You can also increase the "Dry Run Detection Timer." This allows the pump to run dry for a few seconds (e.g., during self-priming) without tripping.
Description Common in the Toshiba "P9" or "Flow" series drives. This is an application-specific trip indicating the pump is running dry (no fluid). It is triggered when the current drops below a set threshold (e.g., 60% of FLA) while running at full speed. Running a pump dry destroys the seals and impellers. Causes
1. Empty Tank: The supply tank is empty.
2. Closed Valve: The suction valve is closed.
3. Vapor Lock: Air is trapped in the pump casing.
4. Broken Shaft: The motor is spinning but the pump impeller is not connected. Solution Do not reset blindly. Check the fluid level. Bleed air from the pump casing.
If the tank is full and the pump is pumping, the "Dry Run Detection Level" parameter is set too high (too sensitive). Lower the detection threshold (Amps or %).
You can also increase the "Dry Run Detection Timer." This allows the pump to run dry for a few seconds (e.g., during self-priming) without tripping.
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