Instruction manual

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Other should be selected if the 4-20 mA transmitter connected to that input is anything other than
the previously mentioned ones. Later when you re-submit the 4-20 mA Input Page, you will be
able to name the input (for example, Phosphate or System Pressure) and also define the Units of
Measure (like mg/l or psi).
4-20 mA Input Calibration Menu
This table is used to calibrate the 4-20 mA inputs.
Following the instructions for your 4-20 mA transmitter, supply the WCT710 controller with a 4
mA signal from each transmitter. You should verify that the transmitter is accurate by measuring
the output with an ammeter. You can read the present value of the mA signal as measured by the
WCT710 controller in the second column of the table. If the present value is not exactly 4 mA,
click on the “Set 4 mA” button. You will be asked to verify that you want to change the
calibration. Once this is done, the controller will read the transmitter signal as exactly 4 mA.
Repeat this process, supplying the WCT710 controller with a 20 mA signal from each transmitter,
and click on the “Set 20 mA” button in order to calibrate the controller.
Click on the “Submit” button to save the changes.
6.18 Digital Inputs Menu (only appears if the digital input option card is installed)
This page is used to assign the function of the devices attached to each digital input. These are
normally already defined in the Start up page.
Click on the radio button to define each input as Not Used, Point Level, PosiFlow (future feature),
or Interlock. Click on the “Submit” button to save the changes.
The actual programming of the various digital inputs will be done in the appropriate page; either
the Level page, PosiFlow (future feature) page, or Interlock page. Refer to those sections for
instructions.
6.19 Bleed Output Menu
This page is used to select the bleed set point, alarms, etc. Which menus appear depends upon how
items were selected in the Start Up page. If you make changes to the Type of Bleed, you will need
to click on the “Submit” button in order to see all the necessary menus.
Type of Bleed
Click on the arrow of the pull down menu and select the way that you want to control the bleed
valve.
System Conductivity is the most commonly used bleed mode, where the bleed solenoid valve is
opened based on the system conductivity.
Bleed Volume per Makeup Volume is used to open the bleed valve allowing a programmed
volume of water out of the system after a programmed volume of makeup water has been added to
the system. This option can only be used if water meters are installed in both the bleed piping and
the makeup water piping.
Time per Makeup Volume is used to open the bleed valve for a programmed amount of time
after a programmed volume of makeup water has been added to the system. This option can only
be used if a water meter is installed on the makeup water line.