ADEMCO Vista-128B PLUS Especificaciones descargar pdf (Pagina 47)

Section 3 - Installing the Control

3-29

Panel Earth Ground Connections

In order for the lightning transient protective devices in

this product to be effective, the designated earth ground

terminal (terminal 30) must be terminated in a good

earth ground. Recommended wire gauge for the ground

connection is #16 AWG, run no farther than 30 feet.

The following are examples of good earth grounds

available at most installations:

• Metal Cold Water Pipe:

Use a noncorrosive

metal strap (copper is recommended) firmly

secured to the pipe to which the ground lead is

electrically connected and secured.

• AC Power Outlet Ground:

Available from 3-

prong, 120VAC, power outlets only. To test the

integrity of the ground terminal, use a three-wire

circuit tester with neon lamp indicators, such as

the UL-Listed Ideal Model 61-035, or equivalent,

available at most electrical supply stores.

The panel requires the earth ground

connection for its lightning transient protection

devices.

Determining the Control’s Power Supply Load

Use the tables that follow to calculate the total current

for the Auxiliary Power, the Alarm Output, and the

Polling Loop. In each table, multiply each device’s

standby and/or alarm current by the number of units

used.

1. In Table 1, enter devices used on the polling loop.

Calculate total current draw on the polling loop.

Table 1: Total Polling Loop Current Draw

Polling Loop Device Current # of Units Total

Polling Loop Subtotal

(terminals 24 & 25 – 128mA)

✳

The total current cannot exceed 128mA. If total load exceeds

128mA, then a 4297 Loop Extender Module can be used. This

module is powered from the panel’s auxiliary power, and

provides a separate polling loop output, which can support an

additional 128mA load. Note that the total number of points

connected to the panel cannot exceed 119.

2. In Table 2, enter devices used on Auxiliary Power.

Calculate standby and alarm currents, then add to

get Auxiliary Power current subtotal.

Table 2: Auxiliary Power Current Load

Total Current

Device

Model #

Device Current X

# of Units

Standby

Alarm

Auxiliary Power Subtotal

(terminals 6 & 7 – 750mA max.)

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 127 128

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ADEMCO Vista-128B PLUS Especificaciones Pagina 47

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