Mircom PRO-2000 Series User Manual

PRO-2000 Installation and Operation Manual
65
Isolator Module
When the addressable detectors and modules are linked to the ADI Card through a communication loop, isolator
modules can be used to divide this loop into several segments.
The Isolator module is an automatic switch that opens when the line voltage drops below 4 Volts. If a short circuit
occurs between any two isolators, both isolators immediately switch to an open circuit state and isolate the Group
of detectors/modules between them. The use of isolator modules enable part of the communication loop to
continue operating should a short circuit occur.
An LED indicator flashes in the normal condition and illuminate steady ON during a short circuit condition. The
Isolator module automatically restores the communication loop to the normal condition when the short circuit is
removed.
The Isolator modules mount into a 4” square listed junction box with the included mounting bracket. Screw
terminals with clamping plates are provided for ease of wiring. It is recommended that sufficient Isolator modules
be installed to ensure that not more than 20 detectors/modules are isolated in the event of a single short circuit.
TYPICAL CLASS A WIRING DIAGRAM FOR A FAULT ISOLATOR MODULE
TYPICAL CLASS A WIRING DIAGRAM FOR MULTIPLE FAULT ISOLATOR
4
3
1
2
ADI Card
L
P
X-
L
P
Y+
LPY-
L
P
X+
ADI Card
LPY+
L
P
X-
LPX+
L
PY
-
Fault
Isolator
Fault
Isolator
Fault
Isolator
Fault
Isolator
Fault
Isolator
Fault
Isolator
Fault
Isolator
(+)
(+)
4
2
(-)
(-)
3
1
(+)
(+)
4
2
SHIELDED, TWISTED PAIR
SHIE
L
DED, TW
ISTED PA
I
R
(+)
(+)
4
2
1
2
2
1
2
1
2
(-
)
(-)
3
1
(+)
(+)
4
2
1
2
1
1
2
2
ALL CIRCUITS ARE POWER-LIMITED AND SUPERVISED
ADDRESSABLE DEVICES
REFER TO APPENDIX B
USE COMPATIBLE
Fault Isolator
Fault Isolator
4
3
1
2
POWER-LIMITED CIRCUITS
POWER-LIMITED CIRCUITS
(
+)
(
+)
(-)
(-)
3
1
2
4
3
1
(-)
(-)
(+)
(+)
4
2
(+)
(+)
(-)
(-
)
3
1
1
2
1
2
2
1
1
2
1
2
4
3
1
(-)
(-)
1
2
2
1
2
(-)
(-)
3
1
1
*
*
*
*
*
* *
* *
*
* *
*
*
*
*
** *
*
*
*
****
*
Figure 50: Typical Isolator Module Wiring - Using EOL Relay for Line Supervision

Mircom PRO-2000 Series Specifications

General

Brand	Mircom
Model	PRO-2000 Series
Category	Control Systems
Language	English