PUMP CONTROL APPLICATIONS
The basic difference between a simple level application and a pump control
application is that the relays assigned to pump functions are normally in a
de-energized state and are energized when pumping is required.
The MultiRanger Plus can be programmed to control up to 5 pumps. Each may be
configured in one of the following ways.
1. Fixed roster: ( P-8,11,14,17& 20 = 8 )
selected pump relays 1-5 always operate in conjunction with their
respective relay setpoints. i.e. relay 1’s operation is always subject to
relay 1’s setpoints (P-9 & P-10). Any combination of the selected pumps
can be operating at a time.
2. Sequential loop: ( P-8,11,14,17& 20 = 9 )
cumulative selected pump relays 1 - 5 sequentially rotate through the
associated relay setpoints changing pump / setpoint
assignment each time the lead pump is turned off.
The lead pump is defined as the pump responding to the
first ON setpoint.
duty / back-up similar to the cumulative sequential loop except that only
one of the pumps designated as duty/back-up can be on
at a time. This feature is useful in older installations
where the discharge main cannot tolerate excessive
pressure. If the lead pump, through wear or blockage,
cannot keep up with the inflow, the next pump in
sequence will come on and the lead pump will be turned
off. The ON setpoints are generally in close proximity,
but the OFF setpoints must be common for all pumps
on the loop.
Sequential operation can be programmed as either
cumulative or duty/back-up, but not both. The
MultiRanger Plus will take the last mode entered
as the common choice for all sequenced relays.
3. Assignment of a pump / relay contact to a setpoint parameter is done by
ratio of the logged service hours. When the service of a pump is required,
the pump with the least amount of service hours ( P\C-24 to 28 ) with
respect to the set ratio ( P\A - 24 to 28 )is started. When a pump is to be
taken out of service, the pump with the least amount of service
hours is stopped.
PL-443 6 – 5
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