Download VCOMB004 R2 VIA Technical Datasheet

VCOMB004 R2, CRN 8271, Date: 02/11/2010
VIA Audio Isolation Barrier
Module
ANZ Ex 08.3021X [Ex ia] I
1. Description
The VIA Audio Isolation Barrier Module is an intrinsically safe voice
communication audio isolation barrier. An audio isolation
transformer, zener diode voltage clamps, DC decoupling capacitors
and current limiting series resistors provide the isolation.
The circuit is symmetric, which means that both terminals serve as
inputs and outputs.
Screw terminals are located on opposite sides of the enclosure on
the lower level of the terminal headers and are labelled 0V1/Audio1
and 0V2/Audio2. Both sides can be worked as input/output terminals
simultaneously for duplex communication.
136
2.35uF
2.35uF
136
Audio1
dc
dc
65
65
Audio2
0V2
0V1
TXF Impedance 600:600
The apparatus is primarily designed for the isolation of two
intrinsically safe audio circuits. It is also used to provide a passive
interface and DC isolation between the Ampcontrol Voice
Communications Controller (VCA) and a communication system.
A single pair twisted telephone cable is used to connect the
communication system to the VIA Module and the VIA Module to the
Voicecom Controller’s audio output. If screened cable is used it
should be earthed at the VCA controller to eliminate ground loop
currents. A suitable barrier must be used between the
communications system and the cable entering the hazardous area.
3.1. Signalling
Outgoing calls from the VCA Controller are initiated by pressing the
call exchange button. The call exchange button places a 200 Hz
tone onto the VCA Controller’s audio output line. The tone is
passed through the VIA Module to the communications system.
Intrinsically Safe parameters must be strictly adhered to when
installing the VIA Module as part of a communication system.
A third party 200 Hz tone detection system, a ring detect and trip
system are required to allow calls to and from the VCA Controller to
be processed and establish an audio path between the
communications system and the VIA Module. The VIA Module does
not trip or process any line reversals.
2. Features
4. Specifications
The VIA – Audio Isolation Barrier Module must be installed in a safe
area or in a flameproof enclosure.





Slim Line DIN Rail mount enclosure
Approved to Ex [ia] Intrinsically Safe Standards for use in
Zone 0 hazardous areas.
Associated apparatus certification.
Isolation of two intrinsically safe audio circuits.
Interfaces between a VoiceCom System and a telephone
system.
3. Application
The VIA – Audio Isolation Barrier Module can be used in various
applications. As the Module is designed for the isolation of two
intrinsically safe audio circuits it can be utilised to connect two
independent Voicecom Systems. This configuration allows audio
communication between the two systems while keeping the digital
control and signalling systems independent (See connection
diagram Over page for 2 independent systems,).
A second typical application the VIA – Audio Isolation Barrier
Module is used to interface the audio output line from the
Ampcontrol Voicecom VCA controller to a communication system
(see typical installation diagram, Over page).
I.S. Parameters
Input:
Ui = 30 V
Um = 30 V
Output:
Uo = 12.6 V
Io = 97.5m A
Co = 30 uF
Lo = 49 mH
Lo/Ro = 1.52 mH/ohm
Enclosure Dimensions
(H x W x D): 74 mm x 23 mm x 100 mm
5. Part Number/s
121100
VIA - Audio Isolation Module
TYPICAL CONNECTION DIAGRAM
SAFE
AREA
ITEM 1
PABX
EXT
ITEM 2
RING
TRIP
HAZARDOUS
AREA
ITEM 3
200Hz
TONE
DETECT
ITEM 4
IS
BARRIER
INBOUND CALL
HANDLING TO
VOICE
CONTROLLER
ITEM 5
1
+
IN
4
LOOP
PABX
EXTENSION
THROUGH
CONNECT
SAFE
AREA
AUDIO LINE
-
VIA
AUDIO
ISOLATION
MODULE
VOICE
CONTROLLER
E09476
E08588
SINGLE PAIR
TWISTED
TELEPHONE
CABLE
OUTBOUND CALL
HANDLING FROM
VOICE CONTROLLER
NOTES
1. ITEMS 1, 2 AND 3 TO BE SUPPLIED BY OTHERS.
2. ITEMS 4 AND 5 SUPPLIED BY AMPCONTROL.
CONNECTION DIAGRAM FOR 2 INDEPENDENT VOICECOM SYSTEMS
VCA
VIA
VCA
E08588
E09476
E08588
AMPCONTROL ELECTRONICS
Ampcontrol CSM Pty Ltd ABN 35 000 770 141
7 Billbrooke Close CAMERON PARK NSW 2285
Phone: (02) 4903 4800
Fax: (02) 4903 4888
E-mail: [email protected]
Web site: www.ampcontrolgroup.com
VAA
VAA
VAA
VAA
E08831
E08831
E08831
E08831