6
Mode 3 Snap Action Pressure Switch
In mode 3 the E30 functions as a single point pressure snap action switch. Either
of the pressure switch’s two output relays can be congured as the snap action
output and the output relay can be congured to have normally open or normally
closed contacts. The state of the output will change as the system pressure
passes through your set snap pressure. The hysteresis of the E30 operating in
mode 3 can also be adjusted from within the user program. The E30 is a solid
state device so unlike a mechanical pressure switch the hysteresis is determined
solely by the pressure units you choose to use.
Mode 1 In Detail
When set to mode 1 the E30 functions as a loss of prime pressure switch. The
user menu allows you to select your preferred pressure units in either kPa or psi.
Once you make your selection the units you have chosen will be displayed on the
LCD screen in all relevant phases of operation.
Mode 1 Remote Input
In mode 1 you can select to use a remote input switch to trigger the starting and
stopping of the pump. If you select to use the remote input the E30 will only allow
the pump to run while ever the remote switch is closed. The remote switch would
normally be a two position level switch in a remote tank or the contacts of a relay
in an external controller.
Mode 1 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
To Next Page
Loading...
Need help?
General