Siemens LIM-1 Installation Instructions Manual
Installation Instructions
MODEL LIM-1
Loop Isolator Module
OPERATION
The Model LIM-1 Loop Isolator module from Siemens
Industry, Inc., isolates short circuits on MXL and
FireFinder-XLS intelligent device loops. By placing
devices between LIM-1s during installation, a short in
the wiring within that group is disconnected from the
rest of the loop. The remainder of the devices
continue to operate. The LIM-1 operates in both
Class A and Class B circuits.
A yellow LED flashes when a device detects a short
circuit. The LIM-1 then isolates that part of the loop.
When the short is removed, the LIM-1 automatically
restores the loop to normal operation. The LIM-1
does not have a loop address and therefore does not
require address programming nor does it reduce the
loop capacity below 60 (MXL) or 252 (XLS) devices.
ELECTRICAL RATINGS
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INSTALLATION
Remove all system power before installation, first
the battery and then the AC.
Refer to Figure 1 for the location and number of the
screw terminals on the LIM-1. The LIM-1 has two
input terminals, two output terminals and an earth
ground as listed below:
Terminal Number Description
1 Loop + IN
2 Loop - IN
3 Loop + OUT
4 Loop - OUT
5 Earth Ground
MECHANICAL INSTALLATION (See Figure 2)
1. Use a standard 3 1/2-inch deep, double gang
electrical switchbox or a 4-inch square electrical
box that is 2 1/8 inches deep.
2. Connect the field wiring. Press the LIM-1 into the
box and fasten the module plate to the box.
3. Cover the module front plate with the plate
supplied and fasten with screws supplied.
DOUBLE GANG BOX
3 1/2-INCHES DEEP
4-INCH SQUARE BOX
2 1/8-INCHES DEEP
Figure 1
Model LIM-1
Siemens Industry, Inc.
Building Technologies Division
Florham Park, NJ
P/N 315-049552-6
SWITCHPLATE
5-INCHES SQUARE
SWITCHPLATE
5-INCHES SQUARE
(SUPPLIED)
(SUPPLIED)
Figure 2
Mounting the LIM-1
Siemens Canada Limited
Building Technologies Division
2 Kenview Boulevard
Brampton, Ontario L6T 5E4 Canada
H
The LIM-1 may be used in two circuit configurations.
T
Class B (See Figure 3)
In Class B wiring each LIM-1 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
LIM-1s at the MXL or FireFinder-XLS enclosure and
run each branch independently.
ANALOG LOOP
NOTES for Figure 3:
1. All wiring must comply with national and local codes.
2. In order to provide adequate protection, it is recommended
that you do not install more than 20 devices on a single LIM-1.
3. Minimum wire gauge is 18 AWG.
4. The total wire resistance (both wires) between LIM-1s
cannot exceed 10 ohms.
5. Do not install more than 12 LIM-1s per loop.
6. All circuits are supervised.
7. Refer to the MXL/MXLV Manual, P/N 315-092036, the MLC
Installation Instructions, Document ID A6V10328217, or the
DLC Installation Instructions, Document ID A6V10239107,
for the list of compatible devices.
8. All terminals are power limited.
+
NOTE: WHEN USING THE
LIM-1 WITH THE DLC,
THE FOLLOWING
POLARITY MUST BE
OBSERVED AT THE LIM-1.
DLC LINE 1 = +
DLC LINE 2 = -
+ -IN+
IN
+
+
-
OUT
OUT EARTH IN
Figure 3
LIM-1 Wiring Diagram
Class B Installation
Class A Single Loop (See Figure 4)
In Class A wiring the LIM-1s are wired in series with
the loop wiring. This results in a single continuous
loop. If any group in the loop has a short, that group is
lost and a Class A circuit failure results. The MXL or
FireFinder-XLS displays communication errors for the
devices and a Class A failure for the loop itself.
NOTE: WHEN USING THE LIM-1 WITH THE
DLC, THE FOLLOWING POLARITY MUST BE
OBSERVED AT THE LIM-1.
DLC LINE 1 = +
DLC LINE 2 = -
INSIDE ENCLOSURE
+ -IN+
+
IN OUT
+
+
+
OUT-EART
+
+
+
OUT
OUT-EARTH IN
+ -
NOTES for Figure 4:
1. All wiring must comply with national and local codes.
2. In order to provide adequate protection, it is recommended
that you do not install more than 20 devices on a single LIM-1.
3. Minimum wire gauge is 18 AWG.
4. The total wire resistance (both wires) between LIM-1s
cannot exceed 10 ohms.
5. Do not install more than 12 LIM-1s per loop.
6. All circuits are supervised.
7. Refer to the MXL/MXLV Manual, P/N 315-092036, the MLC
Installation Instructions, Document ID A6V10328217, or the
DLC Installation Instructions, Document ID A6V10239107,
for the list of compatible devices.
8. All terminals are power limited.
EARTH
TO ANALOG
LOOP RETURN
O ANALOG
LOOP FEED
-
+
IN IN OUT OUT
P/N 315-049552-6 Document ID A6V10239166
IN
+
EARTH
+
-
+
EARTH
+
-
OUTOUT
IN
+
-
+
OUTOUT
ININ
--
--
+
+
+
++
IN IN OUT OUT EARTH IN IN OUT OUT EARTH
-
-
++
+
-
EARTH
+
-
-
-
+
+
Figure 4
LIM-1 Wiring Diagram
Class A Installation (Single Loop)
OUTOUT
ININ
-
-
+
+
-
+
-
+
-
-
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