Pakscan IIS Technical Manual Issue 1.0
Publication S130E 23
7. INSTALLATION and CONNECTION
Once the links and jumpers are set the master station is ready for installation
and connecting to the loop.
7.1 Mounting
The Pakscan IIS master station should be mounted on a flat vertical surface and
in a suitable environment. The height of the front should be between 1.0 m and
1.7 m above the floor so that the screen may be viewed and the keys accessed.
There should be no equipment in front of the master station and sufficient space
should be left below the unit to provide for the connecting cables. The door
hinges on the left and sufficient space in front, and to the left and right of the
unit, should be provided to allow clear access when the door is open.
All connections are to the front terminals of the master station.
7.2 Power
The unit will operate on an a.c. supply between 90 and 264 volts, 43 to 440 Hz,
single phase.
In order to comply with the EC Directives and plant safety requirements it is
essential that an Earth connection is made to the master station via the terminal
and/or the safety earth stud.
7.3 Field Wiring
The field wiring includes the loop wires to the field units. The loop cable should have an overall electrical
screen. Particular attention should be paid to the connection of the screen on this cable.
The wiring should be in accordance with the diagram Fig. 11
Note that the system is a current loop, and that Port A Out (terminal 17) connects via all the field units to Port
B In (terminal 21), whilst Port B Out (terminal 20) connects similarly to Port A In (terminal 18). If a coloured
pair, red and blue, is used this results in say the red wires being in terminals 17 and 21, with the blue wires in
18 and 20. The order is red, blue, blue, red.
Screen Connections
In all cases you must ensure that a safety earth is connected to the master station.
The screen terminals, 19 and 22, are both connected internally to the enclosure earth via a capacitor.
Both the
screens must be connected to the terminals provided
so as to ensure the product meets the European
Directive on EMC.
1.3 m nominal
(1.0 to 1.7 m)
Fig. 10: Mounting height
