2-12 Installing the System
External device connections
+12 VAC auxiliary power
To connect external devices requiring +12 VAC auxiliary power:
1. Connect one end of a two-conductor cable between the device and the
controller to the appropriate +/– terminals on the device.
2. Connect the positive lead to the +12 VAC terminal on the controller and
the negative lead to an available switch (S1 to S4) terminal.
Tip: The maximum current available from the 12-VAC power source,
divided among all the devices in use on S1 to S4, is 1.5 A. The maximum
current capacity of any single event (S1 to S4) is 1.0 A.
CHART +
PRESSURE +
CHART —
PRESSURE —
INJECT
STOP FLOW
HOLD
S1
S2
S3
S4
SWITCHES
GND
GND
GND
GND
AUX
+12V
+5 VAC switch
closure or TTL
device
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