SilentKnight SD500-LIM Line Isolation Module - Manual

P/N 151125
SILENT
KNIGHT
®
SD500-LIM
(Line Isolator Module)
Installation Instructions
The following are instruction on how to install
the SD500-LIM (Line Isolator Module) to a
Silent Knight Analog/Addressable control panel.
Style 7 (Class A) Configuration
An isolator module is used to isolate a short
circuit wiring fault on a Style 7 (Class A) SLC
loop. Normally if the control panel detects a
short on the SLC loop the entire loop is disabled.
When isolator modules are used (as shown in
Figure 1) and a short, open or ground fault
occurs on the SLC loop, it will be detected as a
trouble but all the SLC devices will continue to
operate.
Figure 1: LIM Style 7 (Class A) Example
Class B (Style 4) Configuration
Figure 2: LIM Style 4 (Class B) Example
1. If a short occurs at point A, line isolator 1
will activate, isolating SLC devices 1
through 3 from the rest of the loop.
2. If a short occurs at point B, line isolator 2
will activate, isolating SLC devices 4
through 6 from the rest of the loop.
3. If a short occurs at point C, line isolator 3
will activate, isolating SLC devices 7
through 9 from the rest of the loop.
SD500-LIM Specifications
Specification Parameter Rating
Operating Temperature:
32° - 120° F
(0° - 49° C)
Dimensions:
Length: 4-7/8”
Width 4-7/8”
Depth: 7/8”
Operating Voltage: 32 VDC
Battery Current Draw
during AC loss:
Alarm/Standby: 92 uA
SLC Current: 50 uA
Max. SLC Loop Resistance: 50
Ω
For indoor use only
0-50 devices,
up to 10
Ω per
branch