Instruction manual

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6.16 Interlock Menu
(only appears if a digital input option card is installed and an Interlock radio button is selected in
the digital input section of the Start Up page)
The Interlock feature allows you to use a contact closure (other than the standard flow switch) to
shut down certain control outputs. For example, a dry contact from a DCS could be sent when the
cooling tower is shutdown for maintenance.
Input
Displays which digital input has been selected as an Interlock input in the digital input section of
the Start Up page.
Outputs Interlocked
Click on the check box to the left of the relays that you want to be deactivated when the dry
contact signal is received by the controller. Clicking once places a check in the box, clicking again
removes the check from the box.
Interlock when contact is
Click on the radio button that describes how your Interlock switch operates. If the contact is open
when you want the outputs to deactivate, click on “open”. Otherwise, click on “closed”.
Click on the “Submit” button to save the changes.
6.17 4-20 mA Input Menu (only appears if the analog input option card is installed)
This page is used to assign the purpose of each 4-20 mA input and to calibrate each input.
Status
Possible status messages are Normal (everything is OK), Sensor Error (the sensor signal is not
valid), Over Range (between 20 and 21 mA), Under Range (between 3.9 and 4.0 mA), High
Alarm, Low Alarm or Circuit Board Failure. See section 8.1 for a complete description of error
messages.
4-20 mA Input Assignment Menu
This table is used to reassign the function of the device connected to the input. Click on the radio
button that best describes what is connected to the input. If you assign the inputs on this page, you
need to click on the Submit button to see the appropriate menu selections on the page. These are
normally already defined in the Start up page.
Not Used should be selected if nothing is connected to that input.
Level should be selected if a continuous level transmitter is attached to that output. For point level
devices, which do not use a 4-20 mA signal, wire into and program with the Digital Inputs section.
Corrosion should be selected if a LPR corrosion-monitoring transmitter is connected to that input.