Helios Large Display Dual Analog Input Rate/Totalizer Instruction Manual
PD2-6262
44
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.
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.
3. If the backup pump is not able to keep
up, and the level reaches 7000 gallons,
relay #4 transfers and starts the main
pump as well.
4. Relay #2 trips the High Level Alarm at
7500 gallons and resets at 6900
gallons.
5. Relay #1 trips the Low Level Alarm at
495 gallons and resets at 750 gallons.
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
6245
GAL
6245
GAL
7153
GAL
7782
GAL
495
GAL
