Siemens Building Technologies
Fire Safety
P/N 315-033170-2
OPERATION
The
SIEMENS
Model HLIM Loop Isolator Module isolates short circuits on FireFinder-
XLS analog loops. By placing devices between HLIMs during installation, a short in
the wiring within that group is disconnected from the rest of the loop. The remainder
Figure 1
The HLIM-1 Loop Isolator Module
does not have a loop address and therefore does not require address programming
nor does it reduce the loop capacity below 252 devices.
Remove all system power before installation, first the battery and then the AC.
INSTALLATION
The HLIM is a polarity insensitive module. Refer to Figure 1 for the location of the
two input terminals and two output terminals. Line 1 and Line 2 can be either line of
the loop.
The HLIM may be used in two circuit configurations as follows:
Class B
(See Figure 2) In Class B wiring each HLIM isolates a branch on the circuit. Note that
a short on the main branch causes the entire loop to fail. To prevent this, mount the
HLIMs at the FireFinder-XLS enclosure and run each branch independently.
of the devices continue
to operate. The HLIM
operates in both Class A
and Class B circuits.
A yellow LED flashes
when a device detects a
short circuit. The HLIM
then isolates that part of
the loop. When the short
is removed, the HLIM
automatically restores
the loop to normal
operation. The HLIM
FRONT
BACK
FAULT
IN - LINE 1
IN - LINE 2
OUT - LINE 1
OUT - LINE 2
Loop Isolator Module
Installation Instructions
Model HLIM
