the pressure switch contacts to open. After this initial startup,
and once the system has stabilized, closing of the pressure
switch will trigger the run-on timer and not the start-up timer. In
normal operation, if the pressure falls and the pressure switch
contacts close, it will be the run-on timer that determines the
time the pump runs for. During the initial start up, if the start-up
timer times out before the pressure switch contacts open the
controller will go into alarm mode and the pump will stop.
The same effect will occur when recovering from a dry run lock
out situation. That is, with the system in alarm mode, resetting
the power will start the pump, but it will be the start-up timer
that the pressure switch is controlling and not the run-on timer.
Only after the initial time out of the start-up times will the
system get back into its normal mode where subsequent
closing of the pressure switch triggers the run-on timer.
The start up timer needs to be set to a value that lets the
pressure rise sufficiently to open the pressure switch contacts.
It doesn’t need to be sufficient time to fully pressurize the
system, just enough to get it started. Subsequent closing of
the pressures switch will trigger the run-on timer and it is its
longer cycle that will fully charge the system.
The F30 will start a pump on a falling pressure, and it expects to
see the pressure rise as soon as the pump starts. At any time,
during normal running or during standby, the closing of the
pressure switch contacts will start the run-on timer running. If
the run-on timer times out and the pressure switch contacts
have not opened, the F30 will go into alarm mode. The pump
will stop and the paddle light will turn red and flash rapidly. In
alarm mode the paddle is overridden and even if it is jammed in
the on position the pump will not run. Normally in this situation,
the blue pressure switch light will also be on, indicating that the
pressure switch is closed and therefore the pressure is too low.
To restart the pump, turn the power off wait half a second and
turn it back on. If the pump is running dry, the F30 will again
time out on its main timer, stop the pump and go back into
alarm mode. With the pump primed, reset the power and
observe the blue pressure switch light. As the pressure rises
the blue light will go out and the pump will continue to run
under the control of the main timer. When the timer times out
the pump will stop and the paddle light will revert to slowly
blinking red, indicating all is well and the controller is in
standby mode. If the recommended isolation and bleed valves
have been included in the installation the dry run protection
system can be tested by opening the bleed valve and shutting
off the pump suction isolation valve while the pump is running.
A sensitivity adjusting screw is provided for fine-tuning the
controllers. Under the end of the controllers housing is a hex
headed plug that covers the adjusting screw. Remove the plug
and using a broad bladed screwdriver wind the adjusting
screw anticlockwise to increase the sensitivity (reduce the flow
rate needed to actuate the paddle.) As supplied the screw is
wound fully in, and the controller set to its least sensitive.
The maximum sensitivity is reached with the screw wound out
to a point where the hex dust cover can still be refitted. Normally
the sensitivity screw should be left fully in. If the paddle has
been trimmed too short, the effect can be compensated for by
winding the sensitivity screw out a few turns.
An F30 pump controller can be used in many novel ways to
control a pump. The schematic below shows how to use a single
external timer to restart a borehole pump that has dropped
out on loss of prime, due to low yield or high draw down.
AUTO RESTART OF A TANK FILLING SUBMERSIBLE BORE PUMP
A single external timer can be used to control the AUX
terminal of an F30 that in turn restarts a pump after any
required time delay. With reference to the accompanying
schematic, when the tank level switch closes it powers up
the F30 and immediately energises the pump contactor, and
starts the pump. The Normally Closed auxiliary terminals of
the contactor will open, so there will be no power to the
external timer. If the F30 drops the contactor out because of
lack of flow, the contactors auxiliary terminals will close and
power up the external timer. The timer will run for whatever
it is set to, say 2 hours, before its contacts close and power
up the auxiliary terminal of the F30, restarting the F30 and
the bore pump. As soon as the pump starts, power is lost to
the external timer and its contacts open, dropping the power
off the F30 auxiliary terminal. The bore pump runs on under
the control of the F30.
If the bore draws down again, the
process will repeat with the pump restarting at whatever
time interval has been set on the external timer. If the bore
is still dry when the external timer powers up, the pump will
only run for the time set on the F30 main timer, a maximum
of 180 seconds. In a normal situation the bore will recover
during the external timer’s delay, however if the bore
remains dry it is highly unlikely that the short and infrequent
run time of the F30 will cause any damage to the bore pump,
and the user will become aware of the problem when he
runs out of water in the tank.
C
NO
NC
A
N
AUX
E
N
E
A
LEVEL SWITCH
PUMP CONTACTOR
N/C AUX CONTACTS
ON DELAY TIMER
F30 CONTROLLER
125mA
ISOLATION SWITCH
SENSITIVITY ADJUSTMENT
HOW TO CONTROL A LOW YIELD TANK
FILLING BORE PUMP
Made in AUSTRALIA by
KELCO
ENGINEERING
Division of CYNCARD Pty Ltd A.B.N. 20 002 834 844
Head Office and Factory: 9/9 Powells Road BROOKVALE 2100 AUSTRALIA
Postal Address PO Box 496 BROOKVALE NSW 2100
Phone: 61 2 99056425 Fax: 61 2 99056420 Email: [email protected] URL: www.kelco.com.au
PLEASE NOTE Cyncard Pty Ltd reserves the right to change the specification of this product without notice. Cyncard Pty Ltd accepts no liability
for personal injury or economic loss as a consequence of the use of this product. All rights reserved copyright Cyncard Pty Ltd C 2003
