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confi guration. Select YES if you want the 2 pumps to operate alternately.
ALTERNATE PUMPS EVERY 000 STARTS
The maximum frequency of alternation is 2. Meaning every second start
will be the second pump. It means pump one will start fi rst and when it
stops the next pump start will be the second pump. When pump two stops,
the next pump to start will again be pump one. The frequency of alternation
can be set between 2 and 240 starts. If you choose a high number it
means pump two will start and stop less frequently. For example, if you set
the frequency to 100, it means pump one will start and stop 99 times before
pump two starts and stops once. In duty and standby pump sets, a high
starting frequency number can be used as an anti-seizing strategy. Pump
one operates most of the time and occasionally pump two operates once,
just to ensure lack of use has not resulted in it seizing.
The LCD display on the E30 shows which pump is running at any given
time. It also displays a countdown “Alt xxx” in the bottom right corner of
the screen indicating a countdown of the pump alternations. The count
starts at whatever number was entered for alternations and reduces by
one each time the pump stops. When the count reaches zero the second
pump starts. When the second pump stops the count resets to the original
alternation number. By observing the count, it is possible to asses at a
glance when pump 2 will start.
SET LOW PRESSURE TRIP POINT Mode 4
The trip pressure can be set to any value from 0 to 2000 kPa or from 0
to 290 psi. The trip pressure must be set to some value that is less than
the start pressure of either of the two pumps. If either or both pumps are
running and the system pressure falls to below the trip pressure, it is the
trip point pressure that invokes the pressure dip timer. It ultimately shuts
the pump or pumps down if pressure fails to rise above the trip pressure by
the end of the dip timers run-on period.
If you choose not to use the trip pressure or leave it set to zero then the
E30 may not provide dry run protection. The trip pressure can be set as low
as 1 kPa or 1 psi and it will provide loss of pressure protection to a pumping
system, however, it is important to remember that if it is set to zero no low-
pressure protection will be provided by the E30.
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