Precision Digital PD6000 - Manual (Page 60)

Model PD6000 Analog Input Process Meter Instruction Manual
60
Application #2: Pump Alternation Using Relays 3 & 4
1. Relays 1 and 2 are set up for low and high alarm indication.
2. Relays 3 and 4 are set up for pump alternation.
Set and Reset Point Programming
Relay Set Point Reset Point Function
1 495 750 Controls low alarm
2 7500 6900 Controls high alarm
3 7000 900 Controls backup pump
4 6000 1000 Controls main pump
The following graphics provide a visual representation of a typical pump
alternation application with high and low alarm monitoring:
1. Relay #4 turns the main pump on at 6000 gallons and turns it off at
1000 gallons.
2. With the Pump Alternation feature activated, the next time the level
reaches 6000 gallons, relay #3 transfers and starts the backup
pump.