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WATLOW Series 942 User's Manaul
Programming, Chapter 5
Events
Event Outputs
One of the features of the Series 942 is its capability for two event outputs. An
"event output" is simply a pre-programmed ON/OFF event per profile step. The
event may turn any number of peripheral devices ON or OFF to assist you in
controlling your process, system or environment.
For instance, in an environmental chamber, you might wish to circulate air at a given
time in your profile for one or more steps. You might want to turn lights on or off, or
signals, or lock out your humidifier, or you could activate a video recorder.
Ent1 and Ent2 are not visible under the Operation menu unless your unit has
auxiliary outputs and you Setup Ot3 and Ot4 as events.
To select auxiliary outputs as events, enter the Setup menu by pressing the UP/
DOWN keys simultaneously for 3 seconds. The LOC parameter appears. Press
the MODE key until you reach the Ot3 parameter. The default for Ot3 is AL
(alarms). Change the value to Ent (event) if it hasn't already been done. Press the
MODE key to continue on to the Ot4 parameter. Do the same for this parameter
also. Continue pressing the MODE key to exit the Setup menu.
If you return to the Operation menu, Ent1 and Ent2 are visible, and can be turned
ON or OFF from here. Ent1 and Ent2 can also be viewed under the StPt (Set Point)
and SoAh (Soak) parameters in the Program menu.
These event outputs are mechanical relays rated at 6 amps up to 240VAC.
Guaranteed Soak Deviation
The Series 942 Guaranteed Soak Deviation (gSd) feature insures that the actual
temperature tracks a programmed profile within a window around set point. See
the example on the next page. If the deviation is exceeded, the time clock stops
and the lower display alternately flashes gSd and the current parameter until the
process variable returns within the window. Programmed in degrees or units, gSd
is located in the Setup menu. Entering a value of (0) disables the Guaranteed Soak
Deviation function.
