Intrusion Alarm Circuit

TM 5-6350-262-14/5

NAVELEX 0967-466-9050

TO 31S9-4-38-1

applied to terminal S1-D. A duress alarm signal (20 volts dc)

b. Input. Signals from sensor number 1 are applied to the

applied to connector pin J10-6 causes the SCR switch to turn

control unit between terminals 1 and 2 of terminal board A.

on and relay AlOK1 to operate. With relay AlOK1 operated,

An impedance between these two terminals of 0 to 20,000

an impedance greater than 100,000 ohms exists between

ohms is processed by the control unit as a no-alarm signal

output connector pins J10-9 and -8. This duress alarm signal

input. An impedance greater than 100,000 ohms is processed

is applied to control unit latched alarm output terminals S1-D

as an intrusion alarm signal input. Intrusion alarm signals

and -DR concurrent with the instantaneous alarm output. The

from sensor number 1 are fed to connector pins J2-4 and -1 of

latched duress alarm output signal will remain until relay

alarm/tamper module A2. A no-alarm input will result in

AlOK1 is restored by turning operating mode switch S3 to

approximately 0 volts dc output at connector pins J2-6 and -8

TEST/RESET then back to SECURE. If operating mode

(measured between test point A2TP1 and ground). An

switch S3 is at TEST/RESET when the duress alarm is

intrusion alarm input signal will result in approximately 20

received, a normal latched output on terminals S1-D and -DR

volts dc output at connector pins J2-6 and -8. Output signals

is inhibited. In this operating mode a 10-second alarm is

from connector pin 6 of sensor alarm/tamper modules A2

applied to latched output terminals S1-D and -DR in lieu of the

through A6 are routed to status processor modules All and

normal latched output. From pin 2-2 of switch S3, 20 volts dc

A12 for sensor intrusion alarm identification (para. 6-6).

is fed through connector pin J93 and applied to the coil of

Output signals from connector pin 8 of sensor alarm/tamper

relay A9K2. A 20-volt duress alarm input signal activates the

modules A2 through A6 are tied together to form a common

10-second timing circuit which connects the return side of

intrusion alarm buss. No-alarm/intrusion alarm signals on

relay coil A9K2 to the ground buss. With relay A9K2

this buss are routed through section 1 of operating mode

operated, an impedance greater than 100,000 ohms exists

switch S3, in SECURE or TEST/RESET positions, and applied

between connector pins J9-B and -4. This 10-second duress

to connector pin J9-9 for instantaneous and latched alarm

alarm signal is applied to latched alarm output terminals S1-D

output signals. Instantaneous and latched alarm output

and -DR concurrent with the instantaneous alarm output.

signals are discussed in paragraphs c and d respectively.

(2) Non-Latch Alarm. If LATCH/NON LATCH switch

c. Instantaneous Alarm Output. When an intrusion alarm

S5 is in the NON LATCH position, 20 volts dc is not applied to

signal is received during the secure or test/reset operating

the coil of relay AlOK1 to latch a duress alarm output signal.

mode, instantaneous alarm module A9 immediately provides

In the non-latch operating mode, 20 volts dc from S5-2 is

a 10-second alarm signal to control unit output terminal board

routed to connector pin J9-D and applied to the coil of relay

S. In the test/'reset operating mode an internal buzzer is

A9K3. A duress alarm signal input at connector pin J10-6 is

sounded to alert using personnel of receipt of an alarm. Each

now routed out J10-18, through switch S5-8 to -9, and to

of these functions are discussed in the following paragraphs.

connector pin J8-5. The 20-volt duress alarm signal is

applied to, and activates, a 10-second timing circuit. When

(1) Instantaneous Alarm. Signals from the sensor

activated, the timing circuit connects the return side of relay

intrusion alarm buss are applied to a 10-second

coil A9K3 to the ground buss and causes it to operate for 10 +

instantaneous alarm timing circuit and to a 10to 90second exit

2 seconds. In this condition, an impedance greater than

time delay circuit on instantaneous alarm module A9 via

100,000 ohms exists between connector pins J9-B and 4.

operating mode switch S3 (SECURE or TEST/RESET) and

This 10second duress alarm output signal is applied to

J9-9. The exit time delay circuit is adjustable from 10 f 2 to

latched alarm output terminals S1-D and -DR concurrent with

90 + 10 seconds by means of potentiometer A9R6. When

the instantaneous alarm output. The 10second non-latch

operating mode switch S3 is moved from ACCESS or

duress alarm is output in operating mode secure, test/reset,

TEST/RESET to SECURE the delay circuit is activated. A

and access.

latched alarm output is then inhibited from the control unit

output terminal board for the set time period to allow using

personnel time to leave the secured area and not cause an

6-5. Intrusion Alarm Circuit

alarm to be sounded. (Refer to paragraph d.) The contacts of

relay A9K1 are in the position shown in figure 6-1 for a no-

a. General. Intrusion signals may be received at the control

alarm (0 volts) input. In this condition a low impedance of 0

unit from up to five sensors. The signals are processed by

to 2000 ohms exists between output connector pins J9-14 and

separate but identical input circuitry.

The following

-U. This no-alarm signal is routed from J9-14 to J10-14,

explanation of the input circuit for sensor number I applies

through the normally closed contacts of relay A10K4, and out

also to the remaining four sensor inputs.

6-3