sema WPC 11+ - Page 8

8
Descripon of control terminals
Terminal Signal Description
1 +24VDC
The RED Wire from the transducer is connected here.
The Commons for the OPTIONAL emergency pressure switch (terminal 2) , the
OPTIONAL pressure selector switch (terminal 3) and the OPTIONAL remote
interlock are connected here.
2 EMERGENCY PRESSURE
SWITCH
This terminal is used by the Sema controller as a safety shut down. Do not dis-
connect the pre-installed wire unless the transducer has failed and you wish to
connect a Pressure switch to run the WPC in emergency mode. In this case the
pressure switch is connected between terminals 1 and 2. The pre-installed wire
can then either be removed or le in place.
3 Pressure selector switch When this input is o Desired Pressure 1 is used, when it is on Desired Pressure
2 is used.
4 External Interlock As supplied by Sema there is a link between terminal 1 and terminal 4. Oponal
remote interlocks can be installed in place of this link. When the connecon be-
tween terminal 1 and terminal 4 is open the WPC will stop.
5 No user connection This terminal is not used by the Sema controller. Do not connect.
6 4 to 20 ma analogue The BLACK (please note that, in some cables, this wire may be BLUE ) transducer
7 0V The Yellow/Green or CLEAR transducer wire is connected here. This is the screen.
8 No User connection
9 0V
10 No User connection
11 No User connection
12 No User connection
13 No User connection
14 Relay 1 Common
15 Relay 1 N.O.
Relay 1 turns on when the controller has a fault
16 Relay 1 N.C
17 Relay 2 Common Relay 2 turns on when the unit is running
18 Relay 2 N.O.