User manual

DS 2.501A 2 - 16 03/03
SECTION 1 – WIRING PRACTICES
This section sets out the standard specification for Satchnet Field
Wiring. The purpose of this specification is to install and commission
the products to ensure the compliance with EMC Directives
(89/336/EEC and 92/59/EEC). Adherence to this specification will also
prevent failure or mis-operation of the Satchnet networking system due
to the ingress of electrical noise.
INTRODUCTION
Scope
This specification covers:-
• Satchnet field wiring standards and practice, with reference to the
protection of the Satchnet Networking System against electrical
noise.
This specification does NOT cover:-
• The protection of the cables against damage (mechanical, thermal,
chemical, radiation, etc)
• Insulation grades of cables
• Fire resistance, flammability of cables
• Smoke/Fume emission of cables
DEFINITIONS/EXPLANATORY NOTES
For the purpose of this document, the following definitions apply:-
• Extra-Low Voltage (ELV)
Normally not exceeding 50Vac or 120Vdc whether between
conductors or to Earth
• Low Voltage (LV)
Normally exceeding extra-low voltage but not exceeding 1000Vac or
1500Vdc between conductors or 600Vac or 900Vdc between any
conductor and Earth
Note: These definitions are taken from the BS7671 Requirements for
Electrical Installation.
• Input/Output signal terminals
Terminals on a Satchnet Networking controller which connect directly
to the internal circuitry of the controller
This EXCLUDES:-
• Power supply connections
BASIC RULES
Satchnet Networking products input wiring must be carried out using
screened cable. (IAC600 up to 100m no screen required. 101 to 300m
screen required).
Satchnet Networking products serial link wiring must be carried out
using screened twisted pair cables.
All Satchnet field wiring cable conductors must be dedicated:
conductors may not be shared. (See "
Definitions/Explanatory Notes").
See relevant Data Sheets for cable detail.
IAC600 - DS 2.951A
CSMC - DS 2.541A
MMC - DS 2.71A
MMC3601 - DS 2.751A
MMC3701 - DS 2.701A
IAC400 - DS 2.801A
CABLE SPECIFICATION
Cables will incorporate a tinned copper conductor or conductors of
cross-sectional area 0.22mm, 0.52mm
2
or 0.75mm
2
PVC insulated.
Cables preferably will be multi-strand (e.g. 7/0.2, 16/0.2 or 24/0.2).
However, equivalent single conductor cables will be considered.
Cable cores are to be arranged in identifiable pairs. These pairs will
normally be screened individually.
Multicore cables are comprised of a number of pairs within a common
overall screen may be used provided that the installation guidelines for
Satchnet cables are followed (See "Installation").
The cable is to be sheathed overall in PVC.
The serial link (RS485/422) cable should be screened twisted
0.21mm
2
or larger conductor, solid or stranded wire with a maximum
dc core resistance of 12
Ω per 100 metres and maximum capacitance
between the conductors of 60 pico Farads (pF) per metre.
Non-Preferred cables
The following cable types are not recommended due to the physical
difficulty of glanding and termination:-
• Mineral Insulated Cables (MICC)
Part No.0/876-4-600-0-3
CABLE SIZES AND LENGTH OF RUN
The table below gives details of maximum cable lengths and recommended sizes for various functions.
For cable runs greater than those listed, please refer to Invensys Climate Controls Europe.
NOTE: Also refer to relevant Data Sheet.
TABLE 1 – MAXIMUM CABLE LENGTHS
Input Input Input Output Output Output Output Output
Cable
Size
AWG Diameter
mm
(Nominal)
Cross
Sectional
Area mm
2
R/kM
Ω
R/kM
(Loop)
Ω
DRT, DWT,
DOT, DST,
DDT, DDU,
DDH, DRH
(0-10Vdc
Signal)
RPP, RPW,
DRT
(Adjustable)
RDE
VFC
Override
Timeswitch
Etc.
XRM ALX, ALXS,
ARX,
Relays
0-10Vdc
Signal to
ALE, ALES,
ARE,
ARES,
AVUE
24Vac
Supply to
ALE, ALES,
ARE,
ARES,
AVUE
a
LAN
COMMS
Cable
a Communication (LAN) cable:- <60pF per metre.
Max. Ω
per
conductor
15 Ω 10 Ω 5 Ω
10 Ω 5 Ω 50 Ω 3 Ω 120 Ω
Max.
recom
-mended
metres
Max.
recom
-mended
metres
Max.
recom
-mended
metres
Absolute
Max.
metres
Max.
recom
-mended
metres
Max. recom
-mended
metres
Absolute
Max.
metres
Max.
recom
-mended
metres
7/0.2 24
23
0.6
0.21
0.219
0.259
86 176 170 110 55
b
110
b1.5mm
2
core unscreened cable may be used for distances up to 100 metres. Also refer to Data Sheet for maximum impedances and lengths.
b
55
Max.
Distance
300
b
30
Max.
Distance
1000
16/0.2 21
20
0.93
0.412
0.52
0.556
38 76
Max.
Distance
300
265 130
b
265
b
130 As Above
b
75
Max.
Distance
1000
24/0.2 19
18
1.14
0.636
0.75
0.826
25.5 51
Max.
Distance
300
Max.
Distance
300
195
b
Max.
Distance
300
b
195 As Above
b
115
Max.
Distance
1000
32/0.2 18
17
1.34
0.826
1.005
1.04
19.1 38.2
Max.
Distance
300
Max.
Distance
300
260
b
Max.
Distance
300
b
260 As Above
b
115
Max.
Distance
1000