Document: LT0273

MX4428 MXP Engineering / Technical Manual

 

Analog Loop Design Considerations

ELECTRICAL -

Different construction/materials give different

REQUIREMENTS

AC characteristics, noise immunity, etc.

(ii)CABLE WEIGHT

(i.e. gauge of wire used)

MECHANICAL-

Does the application

REQUIREMENTS

specification, or prevailing standards, call for a minimum gauge

 

(AS1670.1 specifies a minimum of .75mm² standard, for

 

instance).

ELECTRICAL -

What is the minimum gauge wire that can be

REQUIREMENTS

used without exceeding the maximum voltage drop for the

 

number of devices over the required loop length.

The four areas to be considered therefore are

•AC requirements

•DC requirements

•Mechanical requirements

•Noise immunity

4.4

AC REQUIREMENTS

4.4.1GENERAL

All common types of wiring with a total length of up to 2000m may be used. Refer to section 3.2.3.

4.5

DC CONSIDERATIONS

4.5.1GENERAL

A maximum voltage drop of 17V is allowed on the cable from the MXP to the most distant device. This applies both where

•the cable is driven from the “left” end only.

•the cable is driver from the “right” end only.

Refer to the calculations in section 3.2.2.

4.6MECHANICAL CONSIDERATIONS

Electrical considerations aside, the system design should take into account mechanical

aspects such as .....

•Need for fire rated cable.

•Need for mechanical protection.

Issue 1.5

24 March 2006

Page 4-7

Page 74 Page 76
Page 75
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Tyco MX4428 technical manual AC Requirements, DC Considerations, 6MECHANICAL Considerations
Page 74 Page 76

MX4428 specifications

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