ADEMCO VISTA 5140XM Anleitung zur Fehlerbehebung PDF herunterladen (Seite 11)

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Updated: 8/17/12

Tech Note

Single 4297 to Extend Polling Loop

Figure 3: Single 4297 to Extend Polling Loop

D1-i + … Dn-i = 128 max, or per Tables 1 & 2, above.

D1-o

+ … Dn -o

= 128 max, or per Tables 1 & 2, above.

+ L

out

≤

12,000 ft., unshielded

≤

or per Tables 1 & 2, above, whichever is smaller.

Using the VPLEX-VSI Short Isolator

6,000 ft., shielded, or per Tables 1 & 2, above, whichever is smaller.

The VPLEX-VSI Short Isolator provides short circuit isolation for devices on V-plex control panels. When a short

occurs on a polling loop branch, it illuminates a trouble LED and isolates the defective branch from the system—

reducing troubleshooting time.

1. Det ect s and i sol at es poll ing l oop br anches wi t h complet e or r esi st i ve shor t s, and overl oad

or defect i ve poll ing l oop devices on ini t i al power up

2. Can be used t o i sol at e bur gl ar y devi ces fr om fi r e devices,

3. L ED i ndi cat or r educes t r oubl eshoot i ng t i me. L ow power consumpt i on, power ed di r ect ly

fr om t he V-Pl ex two-wi r e poll ing l oop • Can be placed on any major or mi nor br anch i n

any confi gur at i on on t he poll i ng loop.

The VPLEX-VSI automatically returns to normal operation and the Trouble LED is extinguished, when the trouble

condition on the output side of the VPLEX-VSI is rectified.

A control panel normally reports a short on a polling loop as a trouble on zone 97 or 997. When using the VPLEX-

VSI in a properly configured polling loop, this trouble condition will not occur. Instead, the zones isolated by the

VPLEX-VSI will report in trouble. A few panels do not have any delay on reporting a polling loop short as a

trouble. With these panels, a 97 or 997 trouble will be reported for a polling loop short. Otherwise, operation is as

described above.

Polling Loop

Control

Panel

4297

out

Dn-i

D1-i

Dn-o

D1-o

1 2 ... 6 7 8 9 10 11 12 13 14

Tech Note 1

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