Bird
Manual 7-9619-1
08/21/18
Page 6
vide the operating voltage for the alarm panel.
Because the alarm panel is designed for use in an
NFPA compliant system it is assumed that a bat-
tery backup unit is available. The Bird battery
backup unit is a 24 VDC unit. But is typically
located some distance away from the alarm panel
installation location.
Assuming the operating voltage connection
between the Bird battery backup unit and the Bird
alarm panel is made with a 24 gauge wire the max-
imum workable distance will be about 2200 feet.
This is determined by calculation using the maxi-
mum allowable voltage drop across the length of
the operating voltage cable (about 14 VDC) and
the expected loss of 24 gauge wire (about 0.02567
ohms per foot). If you are planning on using alarm
panel operating voltage from a Bird battery backup
unit that is close to this maximum workable dis-
tance contact the factory for guidance.
To complete the installation of the alarm panel
make sure the wire connections inside the box do
not pinch when the door is closed. Close the door
and turn the two front panel locking screws.
Operation
Operation of the alarm panel is very straight for-
ward. When the alarm panel is powered-up the sta-
tus lights will be green for any of the 5 monitored
parameters that have their alarm input terminals
connected to normally closed contacts. That
means back at the signal booster the twisted pair
must be connected between the NC and COM ter-
minals of the form-C contacts for the parameter
being monitored and the signal booster must be in
the non-alarming state.
When the signal booster decides that the moni-
tored parameter is in alarm it will open the connec-
tion between the NC and COM form-C contacts.
This action will be seen by the alarm panel as a
loss of bias voltage (0.5 volts) at its MOSFET input
and the green segment of the front panel LED will
turn off and the red segment will turn on. This
switching logic means that a break in the signal line
between the booster and the alarm panel will also
show up as a red LED.
As an aid in troubleshooting signal wiring issues
that might arise between the booster and the alarm
panel, field engineers can temporarily disconnect a
signal line pair at the alarm panel and the red LED
segment should illuminate. With the twisted pair
temporarily disconnected place a wire loop
between the two terminals at the alarm panel input
and the green segment of the front panel LED
should illuminate.
30303 Aurora Rd. Solon, OH 44139 Tel: 1-440-248-1200 [email protected]
www.birdrf.com