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Introduction
The E30 digital pressure switch is a multifunction digitally programmable pressure
switch that can be set up to function as a conventional differential pressure switch,
a loss of prime pressure switch, an over and under pressure protection device (a
pressure guard) or as a digital snap action pressure switch with normally open or
normally closed contacts and an adjustable differential.
The way the E30 functions is selected using the pressure switch’s simple menu
structure. The switch functions are divided into three modes. Mode 1 sets the
E30 up as a loss of prime pressure switch and by leaving its trip pressure set to
zero, a conventional differential pressure switch. Mode 2 sets it up as a pressure
guard and mode 3 emulates the function of a mechanical snap action single
pressure point pressure switch.
The actual selection of a suitable mode of operation is beyond the scope of this
requires. A specic mode must be selected prior to programming the E30 and
that selection will depend on what level of control is required. In order to achieve
the best performance from the E30, observe the following basic points.
1) Use the least number of functions possible. Do not program in functions you
do not specically require as to do so will make the system’s operation
unnecessarily complicated and may produce unexpected interactions between
the various functions.
2) When moving from mode to mode and from function to function always reset
time and pressure values back to zero before moving on. Do not leave timers or
pressures set up with some value entered and subsequently decide not to use
that specic function. If you do this then enter zero values or purge the system
before exiting the unrequired function. Provided the E30 is unlocked, a quick way
to reset and clear out any unwanted settings is to press and hold down the (P)
button while also pressing the (R) reset button. This is called purging the system
and doing this clears all the user settings out of the E30 and restores it to its
original default state.
3) Set realistic and sensible values into the various functions. For example, do
not try to set a pump to stop at a lower pressure than you set it to start at. Always
set the E30’s starting and stopping pressures to as wide a difference as possible.
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