ADEMCO VISTA 5140XM Anleitung zur Fehlerbehebung PDF herunterladen (Seite 7)

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Updated: 8/17/12

Tech Note

Check 97/997 (polling loop short)

Indicates that there is a physical short or Low Voltage on the polling loop, or too much current being drawn.

1. The panel recognizes a short when the voltage on the polling loop drops to 4.5 Vdc or below.

2. Isolate this by checking voltage on the polling loop with wires connected and with all wires removed.

Check troubleshooting section under “

Random Checks”.

Limitations of V-plex Cable runs

The ADEMCO Polling Loop (V-plex) has t he foll owi ng li mi t at i ons, which apply to panels with 128ma

Procedure for Determining the Maximum Wire Length per Polling Loop

1. Use table 1A for Unshielded Twisted cable and table 1B for Shielded cable.

2. Determine the maximum device loading on the polling loop branch by adding the load currents per device

determined from

Table 2.

a. Example: One 4190SN requires 2.0 mA. One 4208U requires 27.3 mA. The total load for one

4208U 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 total device load current determined in

step 2. Example: A total load current of 37.3 mA, corresponds to the row of (33-40) mA.

4. The maximum cable length can now be determined from the size, or gauge, of the wire used in the cable.

5. Example: The maximum cable length of No. 20 gauge wire for a total device load of 37.3 mA is 4,680 ft if

either unshielded (table 1A) cable or shielded (table 1B) cable is used. If No. 18 gauge wire were used

instead, the maximum allowable cable length would be 7,410 ft for unshielded cable and 6,000 ft for

shielded cable.

Total Load (ma @ 11.5) Vdc

22 ga

20 ga

18 ga

16 ga

1-16

12,000

17-24

4,850

7,810

12,000

25-32

3,640

5,850

9,260

12,000

33-40

2,910

4,680

7,410

11,760

41-48

2,420

3,900

6,170

9,800

49-56

2,080

3,350

5,290

8,400

57-64

1,820

2,930

4,630

7,350

65-72

1,620

2,600

4,110

6,540

73-80

1,450

2,340

3,700

5,880

81-88

1,320

2,130

3,370

5,350

89-96

1,210

1,950

3,090

4,900

197-104

1,120

1,800

2,850

4,520

105-112

1,040

1,670

2,650

4,200

113-120

970

1,560

2,470

3,920

121-128

910

1,460

2,310

3,680

Table 1: Polling Loop Wiring Using Unshielded Twisted (or non-metal conduit)

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

Tech Note 1

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