Emergency operation
18
Siemens Building Technologies
007831_a_en_--.doc
Fire & Security Products
03.2004
The
number of wires
in the connection cable depends on the application:
a) Are control consoles supplied from the control unit with 24V?
b) Is an emergency power supply also provided according to EN54?
c) Is the emergency operation circuit also provided?
Application C-Bus
24V
supply
Emergency
supply
Emergency
operation
circuit
Number of
wires
24V supply from control unit
Complies with EN54
X (2 wires)
X (3 wires)
X (2 wires)
X (3 wires)
10
24V supply from control unit
without emergency opera-
tion / emergency power
supply
X (2 wires)
X
(3
wires)
- - 5
Note:
–
Emergency operation circuit also required between other CPUs
–
Emergency operation circuit and the emergency power supply are not laid out as a loop line
–
Route emergency power supply in a separate cable or in the C-Bus cable feedback
