Prime Loss

Prime Loss (image 1.1) applies to stations with a suction‑lift intake. It monitors whether pumps retain water in the volutes while the station is idle. This feature requires a wet/dry switch. If the wet switch indicates dry (or the pumps lose prime), the station will return to priming mode.

To verify wet‑switch status, check the main screen next to each pump (Image 1.2): “Wet” indicates ready for normal operation; “Dry” indicates the pump must reprime before starting.

1.1 Prime Loss	1.2 Wet Switch

Prime Loss Settings

Prime Loss uses three parameters: Prime Loss Delay, Prime Loss Restart Trials, and Prime Loss Restart Delay (image 1.3).

• Prime Loss Delay: time between detecting a dry wet‑switch and declaring a prime‑loss fault.
• Prime Loss Restart Trials: number of automatic fault/restart attempts allowed for a prime‑loss condition.
• Prime Loss Restart Delay: time the station remains faulted before attempting an automatic restart.

Example: when the wet switch goes dry, the PLC starts a 30‑second Prime Loss Delay and faults. The station remains faulted for 1 minute (Restart Delay) then attempts a restart. This cycle repeats up to 6 restart trials; if the condition persists, the station latches a hard fault and requires on‑site inspection.

1.3 Prime Loss settings