When a service ratio duty is being used,
on all other pumps in use, the standby
pump can be started on a ratio basis
only, when it will assume the setpoints
of the next pump to start. The third
setpoint (P215, 225, 235, 245, 255) is
used to set the service ratio.
There are four pumps. Two rotate their
start-up sequence with each other. If the
two pumps cannot keep up, the level rise
to the setpoints of the other two pumps
which take over and rotate their
sequence with each other.
The third parameter for each relay determines the pump group. You can
have two groups of pumps, and all similar duties within a group will operate
together.
P212, P222, P232, P242, P252 - Relay Pump Group
By default, all pump groups are set to 1, but if you want to have another
group, then set this parameter to 2, for each pump relay that should operate
together as part of a second group.
The fourth parameter and the fifth parameter for each relay set the pump
“ON” and “OFF” points, which are entered in Measurement units P104.
For pump down the “ON” is set higher than “OFF”. For pump up then
“ON” is set lower than “OFF”. See the appropriate pump duty, function
table (P212, 222, 232, 242, 252) for further information.
P213, P223, P233, P243, P253 - Relay Setpoint 1
This parameter determines the “ON” point of the pump.
P214, P224, P234, P244, P254 - Relay Setpoint 2
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