6= Service ratio duty assist
All pumps are used to assist each other
(run at the same time) and each pump
has its own setpoints (P213, 223, 233,
243, 253 & P214, 224, 234, 244, 254).
And a service ratio setting. The third
setpoint (P215, 225, 235, 245, 255) 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.
7= Service ratio duty backup
If a pump fails to meet the demand (due
to malfunction, intake blockage and so
on), then it is stopped and another pump
shall take over. 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). Each pump
has its own setpoints (P213, 223, 233,
243, 253 & P214, 224, 234, 244, 254).
The third setpoint (P215, 225, 235, 245,
255) is used to set the service ratio. 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.
8= First On First Off,
alternate duty assist
The first pump switched on is the first
pump to be switched off, etc. regardless
of the set points, so the setpoints are
dynamically changed to enable this.
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