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Notice that before the first use of the unit, it may be necessary to pass through the configuration process prior to defining the flushing
program in order to adjust the features of controller to the specific application. The configuration process is described below.
6.2.1 The chain of editable fields
Below is the chain of editable fields. The existence of the DP SET-POINT field depends on whether the system contains a built-in electronic
DP or not.
Flush Time
Accumulations
DP
Accumulations
Time
Accumulations
Manual
DP Set-Point
Flush Mode
6.2.2 The Flush Time
Flush Time defines the duration of the flushing time per station. The following options are selectable:
• 5-20 sec in steps of 1 sec
• 20-55 sec in steps of 5 sec
• 1-6 min in steps of 0.5 min
6.2.3 The DP Set Point
NOTE:
The controller is pre-set to a 9 PSI differential pressure. This value can be adjusted up or down based on water quality and screen
size to adequately keep the screen clean. Lower differential pressure values will decrease the amount of contaminant that imbeds into the
screen, especially with finer screens. A balance between differential pressure and the backwash frequency must be established based on
site conditions. The lower the differential pressure, the more backwashes will occur. The higher the differential pressure, the harder the
screen will become to clean. Typical differential set point is generally set somewhere between 6 and 9 PSI.
At this field the user defines the pressure difference between the filter’s inlet and outlet that when reached, a flushing cycle will take place.
The DP set-point field will disappear if there is no Electronic DP connected. In this case the Digital DP input can be used.
Up to version 1.02 of the Filtron 1-10,
A non-zero value Set-point would have caused the controller to ignore the Digital DP input completely, but a zero Set-point would make
the Digital DP effective and cause the Electronic DP to be ignored.
Starting from version 1.03
A change was made so that a non-zero Set-point does no longer cause the Digital DP input to be ignored, but instead a closed contact
Digital DP input will cause the unit to keep on executing flushing cycles as long as the contact remains closed, ignoring the looping limit.
When
the DP contact reopens, the flushing stops right away without completing the running flushing cycle.
Starting from version 1.03 if there is no Analog DP connected or when the set-point equals zero the unit refers to the Digital DP in the
normal way, namely when the contact of the Digital DP is constantly closed it will execute consecutive flushing cycles until reaching the
Looping Limit and then declare an endless Looping problem.
When the pressure is expressed in BAR the range of values is 0.1 – 1.0 BAR.
When the pressure is expressed in PSI the range of values is 1- 15 PSI.
The closed Digital DP contact will be indicated by the symbol :
