ULC underload fault

Hva betyr 8001 ?

The selected signal has fallen below the user underload curve, indicating an underload condition. This often means the motor is running without sufficient mechanical load or there's a problem with the process being controlled. Sustained underload can waste energy or indicate a process issue.

• Loss of mechanical load on the motor shaft (e.g., pump running dry, broken conveyor belt, coupling shear pin failure).
• Motor current has dropped significantly below the configured underload curve threshold (e.g., parameter P7-21 'Underload curve 1 current').
• A process control valve or damper has opened unexpectedly, reducing the system backpressure or resistance.
• Incorrectly configured underload curve parameters (e.g., P7-21, P7-22, P7-23) causing a trip during normal, low-load operation.
• Faulty current sensor or measurement circuit within the drive, reporting an erroneously low motor current value.

Klikk på steg for å spore fremgangen.

1. 1

   Visually inspect the mechanical system driven by the motor for signs of lost load, such as broken couplings, empty hoppers, or dry pumps.

2. 2

   Monitor the motor's actual current (e.g., via drive display or P_ACT_CURRENT) and compare it to the configured underload curve (P7-21 to P7-23).

3. 3

   Review and adjust the underload curve parameters (P7-21: Underload curve 1 current, P7-22: Underload curve 1 speed, P7-23: Underload curve 1 delay) to match the application's actual low-load profile.

4. 4

   Verify the integrity of the motor current measurement by comparing the drive's reported current with an external clamp meter measurement on one motor phase.

5. 5

   Check for blockages or unexpected openings in the process (e.g., pipe, duct) that could reduce the required mechanical work from the motor.