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If the system pressure rises to above the high pressure trip point the E30 will
immediately shut down the system and close its alarm relay contacts and display
a message to the effect that the pressure is too high.
If you choose not to use the high pressure trip point and leave it set to zero the
E30 reverts to providing low pressure protection only for the system. When set
up this way the E30 will start the system using its start-up timer and will expect to
see the system pressure rise to above whatever low pressure trip point you have
set, before the start-up timer times out. Once above the low pressure trip point
the E30 will run the system without any regard to a high pressure limit. If the
pressure falls to below your low pressure trip point the E30 will run its run-on timer
and if pressure fails to rise above the low pressure trip point by the end of the run-
on, the E30 will shut the system down and display a message that the system
pressure is too low.
When operated in the mode described above the E30 does not provide any high
pressure trip point. However, the E30 has an operating pressure range that is
limited to 2000 kPa or 290 psi. If the system pressure exceeds this limit for any
reason and reaches 2200 kPa or 430 psi the E30 will automatically shut down the
system and display a message that its 22 Bar excess pressure limit has been
exceeded. The 22 Bar, 2200 kPa, 430 psi limit is not adjustable and is intended
to protect the E30’s built in pressure sensor against excess pressure.
Mode 3 In Detail
Mode 3 functions as a single point pressure switch. You can choose either relay
1 or relay 2 as your main output and you can congure the chosen relay to have
either normally open or normally closed contacts. A single switch point is set in
the range 7 to 2000 kPa or 1 to 290 psi and the user menu also allows the setting
of a small pressure differential to prevent the switch hunting on and off in situations
where the pressure hovers around the switch point.
When operated in mode 3 the E30 can be used as an alternative to the pressure
guard described in mode 2. The mode 2 pressure guard trips out and shuts the
system down if the system pressure rises or falls outside settable limits. Once
tripped it will not allow the system to restart unless it is rebooted or its remote
input, if used, is triggered. The E30 operated in mode 3 can be used as an
alternate protection device. The principle difference between the two modes
being that unlike the pressure guard operation of mode 2, in mode 3 the E30 will
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