Loss of Prime

What does LOP mean?

The pump load (based on P1-18) dropped below P1-19 for P1-20 time, and output frequency rose above P1-21. This fault is effective when P1-22 (Loss of Prime Selection) is set to 0 (fault).

• Dry well conditions.
• Air ingress into the pump system.
• Absence of water in the pump system.

Click steps to track your progress.

1. 1

   Check for a dry well, air in the system, or no water in the system.

2. 2

   Restart the pump using the preferred priming method suggested by the pump manufacturer.

3. 3

   Set the Loss of Prime fault characteristics using parameters P1-18, P1-19, P1-20, and P1-21.

4. 4

   Control drive response to this condition using P1-21 (Loss of Prime Selection).

5. 5

   Control auto-restart of this fault using L5-51 (Loss of Prime Fault Retry Selection) and P1-23 (Loss of Prime Maximum Restart Time after Fault).