Walchem WebMaster ONE Instruction Manual page 94

System Conductivity
This is a display of the current cooling tower system water conductivity as measured by the
assigned sensor.
Makeup Conductivity
This is a display of the current makeup water conductivity as measured by the assigned sensor
Measured Cycles
This is a display of the current ratio of system conductivity to makeup conductivity.
Status
This displays the current status of the relay output, either "Off" or "On", and if on, the amount of
time it has been on. Possible status messages are Off, Off/Manual, On/Time counting down and
On/Time counting down/Hand (for manual activation). The only possible error messages are
Interlock, Timeout and Sensor Error. See section 8.1 for a complete description of error messages.
Custom Name
This menu allows you to call the output another name if desired. Type the new name in the text
box.
Cycles Dead Band
Type in the desired dead band. See Cycles Set Point below.
Cycles Set Point
Type in the desired set point value. The control direction is always a High set point, so if the
measured cycles exceeds the set point, the relay will activate until the measured cycles is less than
the set point minus dead band.
Cycles Low/High Alarm
Type in the desired alarm points.
Mutual Interlocks
Click the check boxes to select or de-select the relays and analog output control outputs that you
want to be prevented from turning ON if this output relay is already ON. If you do not need any
other output to shut off when this relay turns on, UNCHECK all boxes. The selection is mutually
exclusive, meaning that if Relay 2 has Relay 4 interlocked, then R2 won't turn on if R4 is already
on, and R4 won't turn on if R2 is already on. This feature should be used with caution since it can
potentially delay a chemical addition for a long time.
Output Time Limit
Type in the text box the maximum amount of time that the relay can be continuously activated
before the controller deactivates the relay and activates an Output Time Limit alarm. This is
intended to prevent the output from running out of control if the input fails in such a way that it
will never deactivate the relay.
Note that the relay will not activate again until someone resets the timer!
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