Pump Alternation Control Applications (Altern) - FlowLine DataView LI55 Instruction Manual

DataView™ LI55 Level Controller
Pump Alternation Control Applications ( AltErn )
For pump control applications where two or more similar pumps are used to
control the level of a tank or a well, it is desirable to have all the pumps operate
alternately. This prevents excessive wear and overheating of one pump over the
lack of use of the other pumps.
Up to 8 relays can be set up to alternate every time an on/off pump cycle is
completed. The set points and reset points can be programmed, so that the first
pump on is the first pump off.
Application #1: Pump Alternation Using Relays 1 & 2
1. Relays 1 and 2 are set up for pump alternation.
2. Relays 3 and 4 are set up for low and high alarm indication.
Set and Reset Point Programming
Relay Set Point
1 30.000
2 35.000
3 4.000
4 40.000
Pump Alternation Operation
1. Pump #1 turns on when level reaches 30.000, when level drops below
10.000, pump #1 turns off.
2. The next time level reaches 30.000, pump #2 turns on, when level drops
below 10.000, pump #2 turns off.
3. If the level doesn't reach 35.000, pump #1 and pump #2 will be operating
alternately.
4. If pump #1 cannot keep the level below 35.000, pump #2 will turn on at
35.000, then as the level drops to10.000, pump #1 turns off, pump #2 is still
running and shuts off below 5.000.
5. Notice that with the set and reset points of pump #2 outside the range of
pump #1, the first pump on is the first pump to go off. This is true for up to 8
alternating pumps, if setup accordingly.
6. Relay #3 will go into alarm if the level drops below 4.000 and relay #4 will go
into alarm if the level exceeds 40.000.
7. Adding the 4 external relays, expansion module allows using the 4 SPDT
internal relays for pump alternation and the 4 SPST external relays for high,
high-high, low, and low-low alarm indication.
MN301033 Rev B1
Reset Point
10.000
5.000
9.000
29.000
Instruction Manual
Function
Controls pump #1
Controls pump #2
Controls low alarm
Controls high alarm
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