PRAESENSA
Installation wiring | en
67
Bosch Security Systems B.V.
Underwriters Laboratories Listing Document (ULLD)
2021.12.21 | V0.15b | F.01U.402.882
Parts check and identification
A
Multifunction power supply
B
2‑pole screw plug (x6)
C
6‑pole screw plug (small, x3)
D
2‑pole screw plug (small, x2)
E
16-pole screw plug (small)
F
12-pole screw plug (small, x2)
I
Mains power cord
J
Temperature sensor assembly
K
Nut M8 (x2)
M
Battery fuse CF8 100 A
N
Positive battery cable (red)
O
Negative battery cable (black)
P
Bolt M8 (short, x2)
Q
Bolt M8 (long)
R
Spring washer M8 (x2)
S
Washer M8 (x3)
T
Bolt M6 (short, x2)
U
Bolt M6 (long)
V
Spring washer M6 (x2)
W
Washer M6 (x2)
3.7.4
Battery and fuse
The multifunction power supply needs an external 12 V VRLA (Valve Regulated Lead Acid)
battery as backup power source. A 100 A fuse (model CF8) (M) must be used in series with
the positive (red) cable (N) of the battery. It is recommended to mount the fuse at the battery
side (see chapter below), immediately at the positive battery terminal. Alternatively the fuse
can be mounted at the power supply side (see chapter below), when local standards require
so. Never use two fuses, one on each side, because this would increase the series resistance
of the cable assembly and the high peak currents of a system in emergency mode would result
in voltage dips that could limit the maximum available output power to the loudspeakers. The
connected battery must have a capacity of 100 to 230 Ah. The actual required capacity
depends on many variables, see Battery calculation for calculation guidelines. The device is
delivered with cables with crimp eyelet terminals (N + O). These battery cables must be used
to connect the battery.
The temperature sensing assembly (J) is used to sense the temperature of the battery for best
performance. The temperature of the negative battery terminal is a good representation of the
internal battery temperature. Temperature sensing is an important requirement to set the
correct charging threshold voltages to fully charge the battery without overcharging. When the
