Walchem WebMaster ONE Instruction Manual page 124

Custom Name
This menu allows you to call the output another name if desired. Type the new name in the text
box.
Digital Input Status
This menu shows the Open/Closed status of the digital input assigned to the relay.
Activate Relay when Switch is:
Click on the radio button to select whether to activate the relay when the assigned digital input is
either open or closed.
On-Delay
To prevent the relay from chattering on and off in the event that the digital input assigned opens
and closes rapidly, set either an on-delay or an off-delay (see below). Enter a value between 10
seconds and 1440 minutes in the text boxes. A value of 0 allows instantaneous response to the
digital input.
Off-Delay
To prevent the relay from chattering on and off in the event that the digital input assigned opens
and closes rapidly, set either an on-delay (see above) or an off-delay. Enter a value between 10
seconds and 1440 minutes in the text boxes. A value of 0 allows instantaneous response to the
digital input.
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. Any value between 0 and 1440 is acceptable. A value of 0 means
the relay can be left on indefinitely.
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
regardless of the set points by selecting Hand, or force the relay open regardless of the set points
by selecting Off.
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