American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 172)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

Appendix A

DE304.09 Appendix 9A-11

Metro Baseline Re-Baseline: 04/20/10

6. Fuse status shall be indicated in a consistent manner for each fuse except

where otherwise approved.

C Circuits

1. Main Incoming and Supply Circuits

a. A “main” breaker shall be installed to protect the main distribution

terminals and to serve as a power disconnect.

b. A fuse shall protect each power feeder circuit.

c. The fuse shall be rated to protect the circuit wiring and permit full load

of each distributed circuit.

2. I/O Module Common voltage Supply Circuits

a. Common supply voltage shall be individually fused for each input and

output module.

b. Each fuse shall be an indicating type that is sufficiently rated to allow

all inputs or outputs on a module to be active simultaneously and be

rated lower than the main supply fuse so that a fault on a single point

only affects a single module.

3. Control Voltage

a. The power supply shall be 24VDC output, fully enclosed modular unit

for panel or DIN rail mount. The PLC chassis power supply may be

used for control voltage if the rating is sufficient to drive the maximum

PLC chassis configuration and interface module relays for all

indicating and control points in their active state.

b. The power supply shall include automatic load current / short circuit

protection.

c. The voltage power supply output feeds shall include foldback circuitry

such that after a fault is removed from the line the voltage level shall

be automatically restored to its proper operating level.

D RTU Modular Components (general)

1. The RTU components shall be based on a family of processors that are

compatible with the existing Metro SCADA system, having at least 10,000

units in service in North America, with local sales and service available

within 50 miles of Los Angeles.

2. Module components shall be available from the RTU CPU vendor as well

as certified third-party manufacturers to support a wide variety of input,

output, and interfacing requirements.

3. Operating temperature 0-50 degrees Celsius with exception of modular

communications equipment.

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 172