Walchem WebMaster ONE Instruction Manual page 117

This section assumes that the Relay Control Mode is set to Dispersant. Other control mode types
are described in other sections of the manual.
Relay Control Mode
Click on the arrow of the pull down menu and select the way that you want to control the relay.
See Section 6.2 for details on each control mode.
Relay Input Assignment
Click on the arrow of the pull down menu to select the input to be used to activate this relay. In
dispersant mode, this is not applicable, the relay is activated directly before or after a biocide timer
based relay.
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.
On Time
Type the amount of feed time desired (in minutes) in the text box.
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!
It will take some experience to find out what the normal output on-time will be. If the relay cycles
open and closed under worst case conditions in 30 minutes, you may want to set the Output Time
Limit at 60 minutes.
Output Mode
Click on the radio buttons to manually control the relay. The normal selection will be Auto, where
the controller uses the various set points to open and close the relay. You can force the relay closed
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