ADEMCO VISTA 5140XM Guía para resolver problemas descargar pdf (Pagina 13)

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Updated: 8/17/12

Tech Note

Premise/Theory

The control panel internally causes its power negative to float 1 volt below earth ground as shown in the first

diagram below. If any wire attached to the panel shorts to earth ground or a voltage source, it will become the same

reference level as earth ground, causing the panel to see a ground fault.

1VDC

Normal

operation

1VDC measured

from KP(-) to earth

Panel is happy



Negative wire

shorted to

ground.

0VDC measured

from KP(-) to earth

Panel not happy



0VDC

13VDC

Positive wire

shorted to

ground.

13VDC measured

from KP(-) to earth

Panel not happy



Zone Positive

shorted to ground.

6 VDC measured

from KP(-) to earth

Panel not happy



6VDC

Zone (+)

Aux Power (+)

System (-)

Earth Ground

Zone (+)

Earth Ground

Aux Power (+)

System (-)

If panel does not have a

proper earth ground, it

is unable to sense a short

to earth ground.

1 VDC measured

from KP(-) to earth

Panel is happy



(Despite the real ground fault!)

System (-)

Earth Ground

1VDC

Terminal 30 not

connected to a

proper ground

0VDC

Earth Ground

Zone (+)

Aux Power (+)

Table 3: Ground Fault Voltages

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

Tech Note 1

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ADEMCO VISTA 5140XM Guía para resolver problemas Pagina 13

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