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Mode 2 In Detail
When set to mode 2 the E30 functions as a pressure guard. The pressure guard
is a protection device for protecting a pump system from pressure extremes, both
high and low. Its normal application is not to control the pump but to provide
pressure protection should the system’s normal control fail. Consider a multistage
centrifugal pump or a helical rotor pump discharging into low grade Poly pipe. If
the pump’s normal pressure control fails and the pressure rises uncontrollably,
the E30 in pressure guard mode can be set to trip out and stop the pump thus
preventing the pipe system from bursting. If you choose to use the E30 in pressure
guard mode and press (P) you will be asked a series of questions that will lead
you through the conguration process.
Select Pressure Units
The rst question the E30 asks is what pressure units you want to work in, kPa or
psi. The units you choose will be used in all appropriate displays throughout the
E30 once you make your choice.
Mode 2 Remote Input
If you select to use the remote input function the E30 in pressure guard mode will
only operate while the remote input switch is closed. The remote switch can be a
two position level switch in a remote tank or the contacts of a relay in an external
controller.
Mode 2 Start-up Timer
The E30 includes a start-up timer. The purpose of the start-up timer is to ignore
any initial lack of pressure and allow time for the system pressure to rise above
your set trip pressure before imposing any pressure limits on the pump’s operation.
The start-up timer can be adjusted from 1 second to 240 seconds (4 minutes) in
increments of 1 second. The time you set on the start-up timer will depend on the
system. In a bore pump application with a self-draining riser it may take a
considerable time for the line pressure to rise to any appreciable degree, while a
pressure system that is fully primed may only require one or two seconds to
establish pressure.
The start-up timer automatically terminates its run as soon as a pressure higher
than the set starting pressure is detected. You may have set the start-up timer to
30 seconds. If pressure above your set starting pressure is detected by the E30
in 5 seconds then the start-up timer will terminate its run in 5 seconds and revert
to normal running.
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