UTC Fire and Security interlogix AL-1255 Installation Manual page 16

8 Alliance 4-Door/Elevator Controller DGP
Installation Manual
Shielded cable routing
Cnnect the shielding of all shielded cables used in the system at one side to one common earthing point in a
building. If a shielded bus cable is routed via more than one plastic device, you must connect the shielding
from in-coming and out-going cable (Figure 7).
Note: Metal chassis must be earth grounded. Splice shield drain wire at all junctions.
Figure 7. Shielded cable routing
Auxiliary power supply connections
In systems where expansion module power is not supplied by the main control panel or an AC-powered DGP
with auxiliary outputs, you must use a UL Listed power supply suitable for burglar alarm applications, such as
the Altonix300ULX. (Figure 8).
Note: Tie all 0V together. Do not connect the +12 together.
Figure 8. Auxiliary power supply connections
Cable shielded drain wire
System bus
D- D+ 0V
D- D+ 0V+12
DGP
Altronix AL300ULX
auxiliary power supply
D- D+ 0V+12
D- D+ 0V
DGP
D- D+ 0V+12
RAS Control panel
_
+
D- D+ 0V+12
RAS Control panel
Shield drain
wire ground