
AMMONIA User Manual
AMMONIA_User 9/09
4
2
3.4 Contact Set Controls
In this example the
Solenoid 1
is powered by relay
4
.
Relay
4
is controlled by
Pressure
switch ‘
V
’
To view or modify the
Solenoid 1
setpoints
key
UP
or
DOWN
to
Solenoid 1
and press
ENTER
.
Key
ENTER
@
Setpoints
and then
UP
or
DOWN
to the
Setpoint
you wish to modify.
In this example we’ve already modified
TurnON
to 30 seconds
Key
ENTER
@
OFF Setpoint
to modify
Frequency controlled pumps will display
then Feed
and a setpoint in
mL
.
Key
UP
or
DOWN
to change the underlined digit.
Key
RIGHT
to move the underline.
Press
ENTER
to save the new
OFF Setpoint
.
or
EXIT
to leave unchanged.
Each time you modify you’ll get an extra digit.
So in this example you’ll have to edit twice to get
to 3 digits from the default 1 digit
See the following
Contact Set Control Example
.
Solenoid 1
OFF
Setpoints
Test-Prime
4
TurnON setpoint
30 sec
OFF Setpoint
0 sec
Adjust Setpoints
Editing, or Exit
900 sec
OFF Setpoint
900 sec
then
Sidebar:
Contact Set Control Example
:
A pressure switch connected to Analyzer input ‘
V
’ turns
ON
when the pressure drop across a
sidestream filter indicates a need to open Solenoid 1.
The
TurnON Setpoint
is set to 30 seconds to prevent transient states from triggering a backwash.
The
OFF Setpoint
is set to 900 seconds, 15 minutes, the time required to backwash the filter.
Set the
ON Time alarm
on
Pressure
‘
V
’ to 20 minutes, because if ‘
V
’ hasn’t turned
OFF
in 20
minutes, then backwashing failed and filter pressure is still high.