V-Plex Connections And Troubleshooting - Honeywell VISTA-128BPT Installation And Setup Manual

V-Plex Connections and Troubleshooting

Supervision
• A short on the polling loop is indicated by a trouble on zone 997 and reports as a trouble condition only; all
devices wired and programmed will result in a trouble condition. If annunciation is desired, program the zone as
type 05.
• If a device on the polling loop fails (the panel cannot "see" that device), the system displays a trouble condition for
all zones on that device (i.e. 4208SN).
• If it is a single zone, only that zone will display a trouble condition.
• If the panel is armed when a device fails, and the zone is a burglary zone, the system will go into alarm.
A trouble on zone 997 prevents a partition from being armed, unless all polling loop zones on that partition
are bypassed.
Check 997 (polling loop short)
Indicates that there is a physical short, low voltage on the polling loop, or too much current (exceeds 128mA).
1. The panel recognizes a short when the voltage on the polling loop drops to 4.5Vdc or below.
2. Isolate this by checking voltage on the polling loop with wires connected and with all wires removed.
Limitations of V-PLEX Cable runs
The Honeywell Polling Loop has the following limitations, which apply to panels with 128mA:
Determining the Maximum Wire Length per Polling Loop
1. Use table 1 for Unshielded Twisted wire and table 2
for Shielded cable.
2. Determine the maximum load of each device add
them together to determine the maximum wire
length from Tables 1 and 2.
Example
One 4190SN requires 2.0 mA. One 4208SN
requires 27.3 mA. The total load for one 4208SN
plus five 4190SNs on the same loop would be
(27.3+ 10.0) = 37.3 ma.
3. Locate the row in the table selected in step 1
corresponding to the sum of all device currents
determined in step 2.
Total Load
(mA @ 11.5Vdc) 22
1-16 12,000
17-24 4,850
25-32 3,640
33-40 2,910
41-48 2,420
49-56 2,080
57-64 1,820
65-72 1,620
73-80 1,450
81-88 1,320
89-96 1,210
97-104 1,120
105-112 1,040
113-120 970
121-128 910
Table 1: Polling Loop Wiring Using Unshielded Twisted
(or non-metal conduit)
Wiring Notes and Recommendations
•
Twisted, stranded, non-shielded cable is recommended. Avoid sharp bends in the wire.
Wire Gauge
20 18 16
12,000 12,000 12,000
7,810 12,000 12,000
5,850 9,260 12,000
4,680 7,410 11,760
3,900 6,170 9,800
3,350 5,290 8,400
2,930 4,630 7,350
2,600 4,110 6,540
2,340 3,700 5,880
2,130 3,370 5,350
1,950 3,090 4,900
1,800 2,850 4,520
1,670 2,650 4,200
1,560 2,470 3,920
1,460 2,310 3,680
SECTION 4: INSTALLING THE CONTROL
Example
A total load current of 37.3 mA, corresponds to the
row of (33-40) mA.
4. The maximum wire length is determined from the
size, or gauge, of the wire used.
Example
• The maximum wire length of No. 20 gauge wire
for a total device load of 37.3 mA is 4,680 feet if
either unshielded (table 1) or shielded (table 2)
wire is used.
• If No. 18 gauge is used instead, the maximum
allowable wire length would be 7,410 feet for
unshielded cable and 6,000 feet for shielded
cable.
Total Load
(mA @ 11.5Vdc)
1-16
17-24
25-32
33-40
41-48
49-56
57-64
65-72
73-80
81-88
89-96
97-104
105-112
113-120
121-128
Table 2: Polling Loop Wiring Using Shielded (or
metal conduit) one side of the shield to ground.
4-27
Wiring Guage
22 20 18
6,000 6,000 6,000
4,850 6,000 6,000
3,640 5,850 6,000
2,910 4,680 6,000
2,420 3,900 6,000
2,080 3,350 5,290
1,820 2,930 4,630
1,620 2,600 4,110
1,450 2,340 3,700
1,320 2,130 3,370
1,210 1,950 3,090
1,120 1,800 2,850
1,040 1,670 2,650
970 1,560 2,470
910 1,460 2,310
16
6,000
6,000
6,000
6,000
6,000
6,000
6,000
6,000
5,880
5,350
4,900
4,520
4,200
3,920
3,680