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3. Operating elements and displays
Each channel possesses a four-line display for operator guidance and for setting the
parameters of the 6-pole output socket.
Above each output socket is an „Enable" push button located, for activation of the
corresponding output. The output will be activated 1 s after pushing the button „Enable".
This will be indicated by a red LED on the left side, respectively beneath the associated
push button. The set point for the analog output is adjusted by the potentiometer „Value".
The last by „Enable" activated set point is stored and ready for use at the next power on
of the VC 2a .
The potentiometer takes effect over the complete mechanical rotation angle according to
the selected range:
0 - 10 V:
min (left limit stop) 0V and max (right limit stop) 10V
+/- 20 mA
min (left limit stop) -20mA and max (right limit stop) +20mA
4 - 20 mA:
min (left limit stop) 4mA and max (right limit stop) +20mA
That means, the middle position of the potentiometer corresponds to the middle value of
the selected range.
Valve Control 2a (VC2a), Rev. 1.3
Page 5 / 13
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