Siemens Pacemaker UM344-2 Bedienungsanleitung PDF herunterladen (Seite 50)

INSTALLATION UM344-2

September 1995

b) The cable shield(s) may be grounded at a Network Junction Box or Wiring Panel provided that

the cable shields are connected to either a terminal or the Box or Panel frame, and the terminal

or frame is grounded.

The power supply (+) and (-) connections must be floated and the cable shield at the transmitter

must not be connected.

Ÿ Multi-Drop Network

If the Primary Master's power supply output is isolated from ground, the Network may be floated.

The cable shield should be connected only to one point: the Primary Master's negative supply output.

Ÿ Sensor Cable

a) Shielded sensor cable should be used (remote mounted sensor) to minimize the effects of electric

noise. The sensor wires should be twisted to minimize magnetic induced noise.

b) On a remote mounted thermocouple, if the thermocouple measuring junction is grounded to its

sheath (which is also grounded), connect the sensor cable shield to ground as close as practical to

the measuring junction.

c) On a remote mounted thermocouple, if a thermocouple measuring junction is ungrounded, ground

the cable shield and the negative thermocouple wire to a common point as close as practical to the

measuring junction.

d) Do not connect the cable shield to ground at the Transmitter's terminal compartment if the cable

shield is grounded at the sensor assembly.

4.4 MECHANICAL INSTALLATION

This section describes the mechanical installation of a Transmitter and the installation of electrical conduit

for wiring. Transmitter dimensions are given in Figure 8-3.

Mount a Transmitter in any position (orientation).

Be sure to allow sufficient clearance for:

Ÿ Installation of wiring

Ÿ Removal of the enclosure end caps

Ÿ Viewing of the optional Digital Meter

4.4.1 Pipe Mounting

A Transmitter can be mounted to a vertical or horizontal 2-inch pipe using the supplied mounting bracket.

1. Transmitter to Bracket Mounting

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Siemens Pacemaker UM344-2 Bedienungsanleitung Seite 50