0.1 to 10 seconds.) When the contacts are closed -48
5-5. Audible Alarm Panel, Functional Description
vdc is applied through a 1.5 Kohm dropping resistor to a
sonarlert, the electronics flasher, and alarm lamps DS1
a. There are two audible alarm panels, one
connected to the black: Major/Minor Alarm Panel, the
c. The solaralert provides an audible sound. The
other connected to the red Major/Minor Alarm Panel.
electronic flasher operates, opening and closing
The panel is powered by the - 48 vac power system of
contacts 4 and 7. When contacts 4 and 7 are closed,
the associated side of the P&T.
alarm lamp DS1 and DS2 light.
b. The -48 vdc power is connected through
d. When relay K1 contacts open the -48 vdc is
terminal 1 of TB1 to pin 7 of series solid state recycle
removed, and the audible sound along with the flashing
time relay K1. When an alarm is sensed, ground (+48
lights stop. The panel may be tested by depressing
vdc) is applied through terminal 2 of TB1 to pin 2 of
switch SW1. The switch is connected to the panel
relay K1. The relay is activated, and its time delay
ground (+48 vdc) through terminal 3 of TB1.
action begins closing and opening contacts 1 and 3.
(The contact close and open times are adjustable from