Walchem WebMaster ONE Instruction Manual page 134

Output Time Limit
Type in the text box the maximum amount of time that the output can be continuously activated
before the controller deactivates the output (0% or 4 mA) 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 output. Any value between 0 and 1440 is acceptable. A value
of 0 means the output can be left on indefinitely.
Note that the output 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 output
cycles on and off under worst case conditions in 30 minutes, you may want to set the Output Time
Limit at 60 minutes.
Hand Time Limit
Type in the text box the maximum number of minutes that the output can be activated in the Hand
mode.
Output Mode
Click on the radio buttons to manually control the output. The normal selection will be Auto,
where the controller uses the various set points to modulate the output. You can force the output to
a specific % regardless of the set points by selecting Hand, or force the output off (0%, or 4 mA)
regardless of the set points by selecting Off.
If you select Off, the output will not respond again until either Hand or Auto is selected (or if
power is cycled)! If you select Hand, the output will at a specific value (see Hand Mode Setting
below) until either Auto or Off is selected, or until the Hand Time Limit (programmed in the
previous menu) expires or until the controller power is cycled.
The Off mode is handy to prevent the output from responding while you are changing set points.
The Hand mode is handy to be able to test the pump,, wiring, etc without needing to change set
points.
Hand Value
Type in the text box the output % that the output will use when activated in the Hand mode.
4-20 mA Loop Cal
This menu is used to calibrate the device connected to the analog output. Click on Set 4 mA and
the output will drive the loop with a fixed 4 mA of current. Click on Set 20 mA and the output will
drive the loop with a fixed 20 mA of current.
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