Walchem WebMaster ONE Instruction Manual page 115

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.
Set Point
Type in the desired set point value. The control direction is selected below.
Dead Band
Type in the desired dead band. See Set Point above.
Spike Point
Type in the desired set point value for the spike in concentration.
Week 1-4 Schedule
Day of Week: Click on the check box next to the days of the week during which you want a relay
activation to occur. If a box is checked and you don't want an addition that day, click it to un-
check the box.
Time: Type in the text boxes the hour and minute for the addition to occur. Use the arrow for the
pull down menu to select between AM and PM.
On Time: Type in the text box the amount of time that you want the relay to be activated. Any
value between 1 and 1440 is acceptable.
For Bi-Weekly or Monthly Modes, repeat this process for each week in the cycle.
Control Direction
Click on the appropriate radio button. If the sensor reading naturally drops, and you want to bring
it back up, select Force Higher.
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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