System Driver Board; Audio Signal Distribution; Ips Silent Test Operation - Whelen Engineering Company IPS 400 Product Manual

4.3 System Driver Board

The system driver board, shown to the
right, provides a number of functions in
the IPS. The functions are described in
paragraphs 4.4.1 through 4.4.5.

4.3.1 Audio Signal Distribution

Terminal block 1 (TB1) provides eight
sets of terminals, labeled with a plus (+)
and a minus (-), as shown.
Terminal block 2 (TB2) is not used in
an IPS system.

4.3.2 IPS Silent Test Operation

The IPS can produce an inaudible tone
for system testing purposes. The
function of this feature, which may be
initiated by pressing the SI TEST®
pushbutton on the front panel of the
ESC 864 controller, is to exercise the
system speaker drivers in the same
manner as a fully powered, audible
warning signal.
By pressing the SI TEST® pushbutton,
the user may observe the power
amplifier LEDs to determine if a
complete circuit is active between each
speaker (or group of speakers) and the
respective power amplifier channel. The
silent test may also be initiated by a
remote command.
The results of a silent test are presented
on the LED displays, on the front panel,
as shown in the table. Speakers less
than 60 Watts may not indicate
correctly.
J5 J6
J4
J3
J2
J1
3 AMP
F1
13
PC. BD #67729
TB1
SW1
TB2
TB3
SHIELD GROUNDS
.325 CENTERS
SPEAKER AUDIO 1+
SPEAKER AUDIO 1-
SPEAKER AUDIO 2+
SPEAKER AUDIO 2-
SPEAKER AUDIO 3+
SPEAKER AUDIO 3-
SPEAKER AUDIO 4+
SPEAKER AUDIO 4-
SPEAKER AUDIO 5+
SPEAKER AUDIO 5-
SPEAKER AUDIO 6+
SPEAKER AUDIO 6-
SPEAKER AUDIO 7+
SPEAKER AUDIO 7-
SPEAKER AUDIO 8+
SPEAKER AUDIO 8-
.250 CENTERS