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, (P213, 223, 233 & P214, 224, 234).
All pumps are used to assist each other (run at
the same time) and each pump has its own
setpoints (P213, 223, 233 & P214, 224, 234). And
a service ratio setting. The third setpoint (P215,
225, 235) is used to set the service ratio. Each
time a pump is required to start then the pump
with the least running hours (with respect to the
service ratio) is started (i.e. the setpoints are re-
assigned accordingly). For example, if
two pumps A and B have the service ratio set to
2 and 1 respectively, then pump A will operate
for twice as many hours as pump B.
To Next Page
Loading...
Need help?
General