KELCO E30, Installation & Programming Manual

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to 290 psi in increments of 1 kPa or 1 psi depending on the pressure units 
you have chosen to use.  The high-pressure trip point will ordinarily be set 
to some value that is well above the low-pressure trip point.  If you attempt 
to set the high-pressure trip point to a pressure that is lower than the low-
pressure trip point, you will invoke a pressure warning from the E30 to 
check your pressure settings.  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 0 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. 

SPECIAL FUNCTIONS   

Mode 3

In mode 3 you can choose to use either relay 1 or relay 2 as your preferred 
output device.  Relay 1 is the primary relay and it is intended to drive heavy 
loads.  Relay 1 can be used on its own as a set of voltage free contacts or 
it can be used in conjunction with the HD solid state drive to directly control 
pump motors up to 2.4kW single phase or of any required size via an 
interposing contactor.   The timers built into relay 1 limit the speed the relay 
can open and close to about 1.5 seconds per cycle.  This is perfectly