ADEMCO VISTA 5140XM Anleitung zur Fehlerbehebung PDF herunterladen (Seite 12)

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Updated: 8/17/12

Tech Note

Ground Fault Troubleshooting (Applies to Commercial Fire Panels

Only)

Troubleshooting

1. Measure Volts DC between terminals 12 (Panel Negative) and terminal 30 (Ground)

(Note: KP (-), zone (-) and polling loop (-) are all common. Any of these may be used. The exception to

this is any zone that supports 2-wire smoke detectors, and the bell circuits.)

2. To determine where the ground fault is coming from, remove system wires until the voltage between

terminal 12 and 30 returns to 1VDC. Note: as you remove each wire, leave it off until the problem is

corrected. There may be more than one wire with a problem. Note: Leave the earth ground wire connected

during this process.

3. As this progresses, you may eventually reach a point where all wires are removed except the battery and

the earth ground. The next step is to remove the panel from the cabinet. Lay the PCB on a non conductive

material (wood or cardboard). With the earth ground wire now disconnected the panel should give you

1VDC from terminal 12 to 30. If not, the panel is defective.

Notes

Under normal conditions (no ground faults) you should read 1.0VDC (+ or - .5VDC)

A ground fault is sensed when some external input causes the voltage between terminal 12 (Panel Negative) and

terminal 30 (ground) to either drop below .5 VDC or increase above 1.5 VDC

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ADEMCO VISTA 5140XM Anleitung zur Fehlerbehebung Seite 12