Myalarm V-LCD1 Manuale delle Istruzioni Scaricare il pdf (Pagina 28)

INSTALLATION

5-22

System 2 Installation / Programming Manual

Earth Ground

This is very important because the System 2 must be protected from voltage transients, static, and lightning

discharges for proper operation and long life. The ground connection should be made to a proper ground as

defined by the National Electrical Code. Refer to the Shield and Grounding Layout. (Figure 6).

CAUTION: The section of shield which is exposed, after stripping the cable, must be insulated to

protect it from shorting out any components of the circuit board. Use a piece of heat shrink

tubing, a piece of cable jacket or electrical tape.

This is extremely important when cables enter the cabinet under the circuit board.

The connection from the stripped end of the cable to earth ground (Terminal #1) should be

as short as possible. The longer the drain wire the less effective the shield.

Refer to Wiring the Shield to Earth Ground (Figure 7).

Voltage transients must be kept out of the System for proper, successful, and continued operation. This can

only be done by diverting these high-voltage transients to a good earth ground.

DO NOT OPERATE THIS SYSTEM WITHOUT A GOOD EARTH GROUND

Run at least a 14 ga. wire from a suitable earth ground to Terminal #1 of the System. A suitable ground could

be a cold water pipe or building ground. The ground you use must be bonded to the main electrical ground as

defined by the National Electrical Code. Proper bonding is required for safety reasons and to prevent

flashover in an electrical storm. If you are not sure you have a good ground, measure the difference in ohms

between electrical ground and your earth ground. If it exceeds five ohms, one of the two grounds is not a good

earth ground and will need to be corrected. Ground wire runs should be as straight and direct as possible

avoiding sharp bends.

When there is more than one System 2 cabinet located together, you need to establish a “unified ground point”

for termination of your ground. This unified ground point then becomes the point to which all Terminal #1

connections are made. Never daisy chain a ground from one System 2 to another. Remember that a voltage

transient from electrical noise or lightning will always find the path of least resistance to ground. This path

must be kept as short as possible to direct the transient away from the System 2.

Failure to properly install and use an earth ground defeats all safety, lightning, static and electrical noise

protection. Loss of programmed memory and erratic operation may also occur.

FAILURE TO CONNECT AN EARTH GROUND WILL VOID ALL LIGHTNING AND TRANSIENT

MOV PROTECTION BUILT INTO THE SYSTEM.

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Myalarm V-LCD1 Manuale delle Istruzioni Pagina 28