Page
92
Pump Duty
Description
4= Alternate duty backup
If a pump fails to meet the demand (due
to malfunction, intake blockage etc.),
then it is stopped and another pump shall
take over. Each pump has its own
setpoints, (P2
1
3, 2
2
3, 2
3
3, 2
4
3, 2
5
3,
2
6
3, 2
7
3, 2
8
3, 2
9
3, 5
7
3 & P2
1
4, 2
2
4,
2
3
4, 2
4
4, 2
5
4, 2
6
4, 2
7
4, 2
8
4, 2
9
4, 5
7
4).
but each time all pumps have stopped,
then the setpoints are sequentially
rotated between the pumps to ensure
equal pump use.
5= Duty backup and assist
First pump comes on, if it cannot cope,
it goes off and next pump comes on
(duty backup). This continues until the
last pump comes on and if it cannot cope
the first pump comes back on to assist
the last pump (duty assist) if the level
continues to rise all other pumps will
come on (assist) in turn until the level
decreases to the pump off points. Each
pump has its own setpoints, (P2
1
3, 2
2
3,
2
3
3, 2
4
3, 2
5
3, 2
6
3, 2
7
3, 2
8
3, 2
9
3, 5
7
3
& P2
1
4, 2
2
4, 2
3
4, 2
4
4, 2
5
4, 2
6
4, 2
7
4,
2
8
4, 2
9
4, 5
7
4).
Important Information
The pumps are started and stopped at the “ON” and “OFF” setpoints. To
pump down
(reduce level) then set “ON” higher than “OFF”. To
pump up
(increase level) then set “ON” lower than “OFF”.
The
third parameter
for each relay determines the pump group. You can
have two groups of pumps, and all similar duties within that group will
operate together.
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