When The Eia-485 Shield Is In Full Conduit - Fire-Lite Alarms LED-10 Manual

Remote fire annunciator for use with the fire-lite ms-5210ud fire alarm control panel

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When the EIA-485 shield is in full conduit: The EIA-485 loop allows the FACP to

When the EIA-485 shield is in full conduit:

communicate with the LED-10(s). The shield for the EIA-485 loop must be con-

nected to earth ground at the FACP, but must be left floating (no connection) at the

LED-10 if it is the first or only device on the EIA-485 loop. If a second LED-10 is

connected, the shield leaving the first LED-10 must be left floating. The shield

entering the second LED-10 must be connected to the Earth Ground Terminal

(TB1- 6 & 7) on the second LED-10. If additional LED-10s are connected, the

shield leaving each LED-10 must be left floating and the shield entering the

following unit must be connected to the Earth Ground Terminal (TB1 - 6 & 7) on the

LED-10.

Caution! Do not allow the floating (no connection) end of the shield to contact the

conduit. The floating end should be insulated from earth ground.

LED-10 Box

Notes:

1) Power-limited 24 VDC regulated power may be run in the same conduit as the EIA-485 wiring.

2) Twisted, shielded wire is recommended for the EIA-485 communications loop.

3) Each LED-10 electrical backbox is connected to earth ground via the conduit.

4) Shield is connected to the FACP cabinet (earth ground) leaving the FACP.

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Connect the shield drain wire to the

Earth Ground Terminal on the LED-10.

Shield Drain Wire

Document 50400

firealarmresources.com

Rev A

5/15/96

P/N 50400:A

LED-10

TB2-1 (+) EIA-485

TB2-2 (-) EIA-485

TB1-6 Earth Ground

(IN)

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