American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 165)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

Appendix A

DE304.09 Appendix 9A-4

Metro Baseline Re-Baseline: 04/20/10

K All assembly components, cables, and appurtenances shall be accessible from

the front of the assembly.

L Access to the rear of the assembly for any maintenance purpose shall not be

required.

M Provide an appropriately rated breaker for incoming power to serve as a main

disconnect.

N Provide a dedicated terminal block for distribution of incoming power, ground and

neutral/return. The use of 120VAC power cords or plug-in transformers shall be

prohibited. At least two spare circuits shall be provided.

O Provide a dedicated terminal block for assembly 24VDC power distribution and

return with one indicating fuse for each distribution circuit.

P Power distribution shall utilize bus bars. No daisy chain wire distribution shall be

permitted.

Q Supply, return and ground shall use physically separated terminal block sections.

R Provide approved vendor pre-manufactured I/O field interface module (IFM)

terminal blocks for all field wiring or other terminal block assemblies. Each IFM or

I/O terminal block shall be connected to its associated PLC I/O module using a

vendor pre-manufactured cable.

S All assembly wiring shall be secured with panel mounted guides and or other

approved wire management devices.

T All assembly components shall be professionally labeled in accordance with shop

drawings using an approved manner.

U Any terminal block section greater than 48VDC shall have a warning label.

V Multi-conductor cables shall be used to interconnect the RTU discrete I/O

terminal blocks to the Main Distribution Frame or board (herein referred to as the

MDF). Dedicated blocks shall be assigned on the MDF for termination of RTU

cables.

W Each discrete I/O field cable between the RTU and the MDF shall be a minimum

of 25-pair and shall be sufficiently rugged for direct routing in overhead cable

trays.

X All field interface connections shall terminate on the MDF. Outside/external cable

shall terminate on building entrance protection blocks. Subsystem cables within

the RTU communications room/cabinet shall terminate on regular interface

blocks. Cross connect wire shall be used to interconnect each field interface to

the SCADA interface terminal blocks on the distribution board/frame.

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 165