Mircom FA-300-6L Series Especificaciones descargar pdf (Pagina 9)

Wiring

5.0 Wiring

Wire from the last SRM-312 to the next SRM-312 and so on; then from the first SRM-312 to

the Fire Alarm Panel. There are only two connections to be made, one for power and one for

the RS-485 loop.

The RS-485 Wiring to the SRM-312 is recommended to be Twisted Shielded Pair. The wire

gauge may be:

• 22 AWG up to2000 ft.

• 20 AWG up to4000 ft.

The 24V DC field wiring needs to be of an appropriate gauge for the number of smart relays

and the total wiring run length. See Current Drain for Battery Calculations, page 10 and

calculate the Maximum current for all smart relays summed together.

Note: Ensure that the 120 E.O.L. resistor is connected to the RS-485 positive and

negative terminals on the last SRM-312.

Note: All circuits are power limited and must use type FPL, FPLR or FPLP Power

Limited Cable.

Caution: Accidentally connecting any of the 24V DC wires to the RS-485

wiring will result in damage to the Annunciator and/or to the Fire

Alarm Control Panel to which it is connected.

Table 5 Wiring Table

Total

Maximum

Current

MAXIMUM WIRING RUN TO LAST DEVICE (ELR) MAX. LOOP

RESISTANCE

18AWG 16AWG 14AWG 12AWG

Amperes ftmftmftmftm Ohms

0.06 2350 716 3750 1143 6000 1829 8500 2591 30

0.12 1180 360 1850 567 3000 915 4250 1296 15

0.30 470 143 750 229 1200 366 1900 579 6

0.60 235 71 375 114 600 183 850 259 3

0.90 156 47 250 76 400 122 570 174 2

1.20 118 36 185 56 300 91 425 129 1.5

1.50 94 29 150 46 240 73 343 105 1.2

1.70 78 24 125 38 200 61 285 87 1.0

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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Mircom FA-300-6L Series Especificaciones Pagina 9