CHAPTER 4 FUNCTIONING OF EQUIPMENT - TM-5-6350-262-14-100017

CHAPTER 4

FUNCTIONING OF EQUIPMENT

4-1. General

This chapter contains a circuit description of the

equipment operation. Explanations are keyed to the

grid wire sensor schematic diagram shown in figure

4-2. No-Alarm Condition

The normally installed, normally-operatinggrid wire

sensor provides 2 low impedance outputs (ALARM

and TAMPER) to the J-SIIDS Control Unit. The

ALARM output monitors the series-wired horizon-

tal grid and vertical grid network - e.g., alarm output

is provided at terminal 1 from the horizontally-wired

grid to terminal 2, and subsequently to terminal 3 to

the vertically-wired grid and back to terminal 4. The

low impedance TAMPER output monitors both the

Pryoff and Cover Tamper Switches. The TAMPER

output at terminal 5 is routed through the series-

wired tamper switches and back to terminal 6. Refer

to figure 4-1. One or more of the following conditions

will cause a change in the respective outputs, which

will be reflected into the input of the Control Unit

and subsequently will result in an alarm actuation.

4-3. Alarm Conditions.

a. If a wire is broken in either the horizontal or

vertical grid wire mesh, a high impedance output

change will be provided at the respective output

terminals.

b. If the cover, or junction box is moved from its

normal operating position, from 1/8 to 1/4 of an inch,

the output across terminals 5 and 6 will change to

Figure 4-1. Grid wire sensor electrical schematic diagram.

high impedance.

4-1