Tyco RDU Mk2, Инструкция по установке и программированию, Страница: 135 / 178

Document No: LT0499 RDU Mk2 Installation & Programming Manual
Installation & Wiring
Issue 1.02 8 April 2015 Page 8-5
8.1.2 FIELD WIRING
Cabling should comply with all the points in AS1670.1. Note the requirements for
segregation and identification.
The cabling should, in general, be not less than 0.75mm² cross sectional area, insulated and
have red PVC sheathing. Joins should only occur in enclosed terminal boxes, and it is
important that all terminations be good. I.e.
no bare wire protruding from the terminal;
no insulation inside the clamp part of the terminal;
wire not cut or "nicked" during stripping;
wire not soldered;
wire not "doubled back" in the demountable terminals with leaf type strain relief
clamps;
all terminals firmly tightened;
neat service loop;
goose neck where servicing requires cable movement;
coil of spare cable in wall/ceiling to allow for mistake/alteration.
Note that it is best to carry out parts of the initial survey during installation, in particular,
resistance and insulation testing.
WARNING
Apart from the Mains supply to the RDU, only ELV cabling should enter the cabinet.
8.1.3 COMMUNICATIONS WIRING
Each FIP can drive up to 8 replying RDUs. The RDUs are all connected in parallel on
common Tx and Rx circuits. Note that both Star and Bus wiring connections are permitted
as shown in Fig 8.1.4.
NOTE: TX from the FIP goes to RX on ALL RDUs.
RX from the FIP goes to TX on ALL RDUs - not required for mimic RDUs.
Figure 8.1.4 shows an example of interconnection between both MAF and Non-MAF
configured RDU(s) and the FIP.
NOTES:
To maintain electrical isolation:
(1) One end of Lk1 on the MAF/PSU Board should be cut for RDUs with
their own PSU.
(2) Non-MAF configured RDUs (e.g. FP0559, FP0577 or FP0772) that
are powered by a PSU other than the FIP must have Lk3 on the
Remote Termination Board cut and Lk14 on the Controller in the “R”
position.