Guardian Telecom AS12 Owner's manual

7552 - 10
th
Street. N.E. Calgary Alberta, Canada T2E 8W1
Industrial Communications Worldwide
Automatic Amplifier Switch
Model AS12
Installation and Operation
VOX THRESHOLD ADJUSTMENT
AMP. 1 AMP.2AMP.3AMP.4STANDBY
AS 12
AMPLIFIER SWITCH
RESET
Guardian
Telecom Inc .
P005093 Rev. C 070518 7/21/2014 12:01 PM
Ph: 403.258.3100 \ email:[email protected] \ www.guardiantelecom.com

Guardian Telecom Inc. Installation and Operation
Model AS12
Page 2
Table of Contents
Package Contents .................................................................................................................2
Associated Equipment...........................................................................................................2
Overview................................................................................................................................3
Features.................................................................................................................................3
Installing the AS12.................................................................................................................7
Unit Operation........................................................................................................................8
Engineering Specifications ....................................................................................................9
Warranty..............................................................................................................................10
Disclaimer............................................................................................................................10
Warning ...............................................................................................................................10
Service Telephone Number.................................................................................................10
Feedback.............................................................................................................................10
Guardian Product Return.....................................................................................................11
Table of Figures
Figure 1 - Dimensions............................................................................................................4
Figure 2 - Front Panel............................................................................................................4
Figure 3 - Rear Panel ............................................................................................................5
Figure 4 - Block Diagram.......................................................................................................6
Figure 5 - Typical System Installation (with 2 AS12’s)...........................................................6
Package Contents
Model P8300 AS12 Amplifier Switch
One Installation and Operation Manual
Associated Equipment
Model P8200 DA388 Distribution Amplifier
Model P5970 AG17 Alarm Tone Generator

Guardian Telecom Inc. Installation and Operation
Model AS12
Page 3
Overview
Automatic Amplifier Switch
The AS12 Automatic Amplifier Switch continuously monitors the outputs of paging amplifiers to
detect failures. If it detects a problem it will switch the defective amplifier out of the circuit and
activate the standby amplifier. The appliance is capable of simultaneously monitoring four amplifiers
plus a standby, and provides visual indication of amplifier status.
As part of an integrated industrial emergency/communications system, the AS12 ensures
uninterrupted communication in the event of an amplifier failure.
The AS12 Automatic Amplifier Switch is one component in Guardian Telecom's full line of paging
system products, which also includes alarm tone generators and distribution amplifiers.
Features
Simultaneously monitors up to four paging amplifiers and one standby amplifier
Instantly detects and indicates amplifier failure
Automatically transfers output from a failed amplifier to the standby amplifier
Visually indicates amplifier status
Maintains historical visual indicators
Automatically resets amplifiers to normal when a fault is corrected

Guardian Telecom Inc. Installation and Operation
Model AS12
Figure 1 - Dimensions
VOX THRESHOLD ADJUSTMENT
AMP. 1 AMP. 2 AMP. 3 AMP. 4 STAND BY
AS 12
AMPLIFIER SWITCH
RESET
Guardian
Telecom Inc .1
4
256
x 4
x 4
3
Figure 2 - Front Panel
1. Main Power LED
2. Amplifier Status Indicator LED (See below)
3. Fault History Reset Button
4. VOX Threshold Adjustments
5. Backup Threshold Adjustment
6. Backup Amplifier Status Indicator LED (See below)
There are two Status Indicators. The top one indicates an amplifier that has had a detected fault and
is a history indication of that fault. The lower LED illuminates when the fault occurs and extinguishes
automatically once either the audio is no longer applied to that channel or the amplifier has been
repaired.
Page 4

Guardian Telecom Inc. Installation and Operation
Model AS12
USE
F
E
S
U
F
VOX
LOGIC INPUT
AMP. FAILURE
LOGIC OUTPUT
BACKUP
FAILURE SPKR
OUTPUT FROM
AMP. 1
SPKR
OUTPUT FROM
AMP. 2
SPKR
OUTPUT FROM
AMP. 3
SPKR
OUTPUT FROM
AMP. 4
FROM
BACKUP
AMP.
1 2 3 4 5 C
1 2 3 4 5 C
220 VAC
FUSE 1 A
POWER
CHANNEL 1CHANNEL 2CHANNEL 3CHANNEL 4
1
2
3
9 8 4
Figure 3 - Rear Panel
1. Power ON / OFF Switch.
2. Fuse, 1 Amp.
3. Power input for 120/230 VAC.
4. VOX Logic Input (from DA388).
5. Amplifier Failure Logic Output.
6. Audio Output to Speakers 1 – 4.
7. Audio Input from Amplifiers 1 – 4.
8. Audio Input from Backup Amplifier.
9. Logic Output for Backup Amplifier Failure.
Page 5

Guardian Telecom Inc. Installation and Operation
Model AS12
CH-4
CH-3
CH-2
CH-1
AMP-FAIL
Adjustments
Internal Vox
AUDIO INPUTS
70 Volt
Amplifier Outputs
VOX Logic Inputs
CH-SB-FAIL
INDICATOR
FAILED CHANNEL
FAILURE
STAND-BY CHANNEL
AUDIO OUTPUTS
LOGIC INPUTS
CHANNEL
PRE-AMP ACTIVE
ALLOCATOR
BACKUP CHANNEL
DETECTOR
FAIL CHANNEL
CONTROL UNIT
CH-SB
CH-4
CH-3
CH-2
CH-1
CH-4
CH-3
CH-2
CH-1
Figure 4 - Block Diagram
DA388
MIC 1
8 ZONE
ALL CALL
EMERGENCY
PRE-AMP
A
PABX
8 ZONES
BGM
BC
ALARM
GEN.
ABC
VOX
1 - 4 VOX 5 - 8
AUDIO OUTPUTS
1 - 4, B1 5 - 8, B2
LOGIC INPUTS
AUDIO INPUTS
LOGIC OUTPUTS
C
AG17
Figure 5 - Typical System Installation (with 2 AS12’s)
Page 6

Guardian Telecom Inc. Installation and Operation
Model AS12
Page 7
Installing the AS12
Inspect the product for shipping damage. Tip: If the product is damaged,
notify the carrier immediately.
Do not open or attempt to open the AS12 unit. There are no user
serviceable parts inside the unit. Tip: Unauthorized modifications
void the product warranty.
Carefully plan input and output connections.
oIdentify input and output devices.
oPrioritize amplifier inputs. Channel #1 is the highest priority. If
more than one amplifier fails at the same time, the standby
amplifier will only replace the highest priority, the lowest numbered
amplifier.
Tip: Familiarize yourself with
unit capabilities and functions.
See: Block Diagram and Unit
Operation details.
Choose a location on a standard 19" equipment rack with three rack
units (3U) of available space. See: Specifications for overall
dimensions.
Do not apply power to the AS12 before connecting input and output
devices.
Ensure all devices that will be connected to the AS12 are turned off.
Follow all appropriate electrical codes for the installation.
Use the following sequence when wiring connections:
oAudio Inputs
See: Connection Details,
below.
oControl Logic Inputs
oRemove quick disconnect connector (Phoenix Combi-Con).
oWire the connector.
oPlug the connector back into the unit.
Connect input power to a 120 volt AC power source. Tip: 240 volt AC input power is
available as an option.
After all connections are complete, apply power to the AS12.
Apply power to all input devices.
See: Connection Details and
Unit Operation, below.
Connection Details See: Block Diagram.
Connect Audio Inputs and Outputs to the Combi-Con connector as
follows: Tip: The maximum switching
capacity of each circuit is 325
watts using a 70V paging line.
oTerminal #1 – 70V/100V Audio Out Hot Lead (to Speaker).
oTerminal #2 – 70V/100V Audio Out Common (to Speaker).
Tip: Terminal #1 is the left
terminal viewed from the wire
side.
oTerminal #3 – 70V/100V Audio In Hot Lead (Amplifier Output).
oTerminal #4 – 70V/100V Audio In Common Lead (Amplifier Output).
oVOX Logic Input – Cable supplied with DA388 Tip: DB9 connector
oAmp Failure Logic Output – For remote indications of faults.

Guardian Telecom Inc. Installation and Operation
Model AS12
Page 8
Unit Operation
Normal Operation
The AS12 detects amplifier failure by comparing logic input through the
absence of an output signal.
LED Indicators
When an amplifier goes into a fault condition, the corresponding amplifier
status indicator LED on the front of the AS12 illuminates. See: Front Panel
drawing.
othe upper LED illuminates to show a history of amplifier failure and stays
lit until the reset button is pressed.
othe lower LED stays illuminated as long as the amplifier is in a fault
condition.
If the standby amplifier goes into a fault condition, the lower Standby LED
illuminates and the upper LED will record the history.
Standby Failure
If a problem is external to the amplifier when the primary amplifier fails the
standby amplifier will also fail.
Multiple Amplifier Failure
If more than one amplifier fails at the same time, the standby amplifier will
only replace the highest priority (the lowest numbered) amplifier.
Tip: Certain problems
external to an amplifier
on the paging zone(s)
may case the primary
amplifier to fail.
Reset LED History
After identifying and correcting an amplifier fault, press the reset button to
clear LED history indicators.
Setting VOX Threshold Adjustments
The VOX threshold adjustment is used to compare with the Logic VOX
input from a device such as DA388 or a TOA automatic Microphone
Mixer VOX logic output to determine the presence of a valid audio output
from the amplifier.
With a variable signal input to the DA388, raise the level until the VOX
logic signal is just activated.
Turn the VOX Threshold adjustment to minimum and the event LED will
be illuminated.
Adjust the Threshold level until the event LED extinguishes.
Repeat the process for all channels.

Guardian Telecom Inc. Installation and Operation
Model AS12
Page 9
Engineering Specifications
Electrical Requirements
INPUT VOLTAGE 120 VAC (230 VAC AVAILABLE FROM FACTORY)
MAXIMUM CURRENT CONSUMPTION 12 VA
FUSE 1AMP;3AG
Audio Performance
Audio Inputs (4 Page, 1 Backup Line)
MAXIMUM VOLTAGE 115 VAUDIO (MAY USE 70V OR 100V AMPLIFIER)
MAXIMUM POWER 1200 WATTS @70 V/1500 WATTS @100 V
Logic Performance
Logic Inputs 5V TTL LEVEL
RECOMMENDED ACTIVATING DEVICES:DRY CONTACT RELAY
MINIMUM OPEN COLLECTOR/OPEN
DRAIN CURRENT CAPACITY 100mA
Logic Outputs (4 Logic, Open Drain Outputs)
OUTPUT SWITCH CURRENT CAPACITY 40V DC, 30mA MAX.
Backup Failure Outputs)
OUTPUT SWITCH CURRENT CAPACITY 125 VAC, 1A
Mechanical
BODY CONSTRUCTION 18 GAUGE STEEL
FACEPLATE CONSTRUCTION 10 GAUGE STEEL
BODY DIMENSIONS 415 X313 X123 mm (16.3 X12.3 X4.9 IN.)
FACEPLATE DIMENSIONS 483 X133 mm (19 X5.3 IN.)
NET WEIGHT 6LBS (2.7 KG)
MOUNTING EIA RACK MOUNT -EIA STANDARD 3RACK UNITS
CONNECTION FITTINGS COMBI-CON AND DB9
PAINT EPOXY POWDER COAT

Guardian Telecom Inc. Installation and Operation
Model AS12
Page 10
Warranty
Guardian Telecom warrants your product to be free of defects in material and workmanship for a
period of one year. Guardian Telecom will repair or replace any defective unit that is under warranty
free of charge.
This warranty is null and void if any non-authorized modifications have been made to this product, or
if it has been subjected to misuse, neglect, or accident. This warranty covers bench repairs only; such
repairs must be made at Guardian Telecom or an authorized service depot. Guardian Telecom is not
responsible for costs incurred for on-site service calls, freight, or brokerage.
A return authorization must be obtained prior to warranty claims or repairs.
Disclaimer
The products covered by this manual are designed for use in Industrial Environments and/or
Hazardous Locations. Due to the range of possible applications for these instruments the
manufacturer will not be responsible for damages or losses of any kind suffered as a result of the use
of this product, including consequential damages.
Warning
This device has no user serviceable internal components; the only maintenance possible is the
replacement of the fuse – which is available from the back panel.
Service Telephone Number
1-800-363-8010
Guardian Telecom provides a customer service telephone number which is toll-free within North
America. If you need assistance when installing or operating this product, please call the toll-free
telephone number between regular business hours (8:00AM-5:00PM), Mountain Standard Time. If
you are calling outside of regular business hours, please leave a detailed message, and a member of
Guardian Telecom’s Service Department will return your call as soon as possible. If your product
requires service, Guardian personnel will supply you with an RMA (return materials authorization)
number over the telephone or through our web site product return page. This number must be
included with your return address and the name of the person to contact.
Guardian Telecom Inc.
7552 - 10th Street N.E.
Calgary, Alberta, Canada T2E 8W1
Toll-free 1-800-363-8010
Ph. [phone]
Fax. [phone]
www.guardiantelecom.com
Feedback
Guardian Telecom continually strives to make reliable, durable, and easy to use products. If you, as
an installer or user of our equipment, have any suggestions for improvements to this or any of our
products or documents, including this manual, we would appreciate hearing from you.

Guardian Telecom Inc. Installation and Operation
Model AS12
Page 11
Guardian Product Return
Guardian products have been quality tested and are in full working order when
shipped from the factory, given the rugged nature of these products shipping is not
expected to damage a unit. In the unlikely event of a malfunction, Guardian follows the
three step procedure below.
Step I - On-Site Correction
The most common source of difficulties with a new product is improper installation
in one of two ways: incorrect wiring connections or connection to an incorrect
power source.
Product wiring needs to be properly connected to the on-site wiring. Correct wiring
instructions are shown in the user manual included with the product.
Step II - Return Materials Authorization (RMA)
When a product has been installed following user manual instructions, and the unit
fails to operate, the user must contact Guardian Telecom to obtain authorization to
return the product. This can be done by completing a RMA form online at
www.guardiantelecom.com, or by calling the service telephone number given in
this manual.
After providing information on the product, the owner and the nature of the
problem, Guardian will issue a RMA number, to be shown on documentation
returned with the product.
In addition to the RMA number, shipping documents should include name, address
and telephone number of the owner along with contact information for the person
responsible for the repair and/or the user who identified the malfunction.
(Where a product is being returned for repair from outside of Canada, customs
documentation must show the product’s serial number, date of export [date of
purchase], and a notation that the equipment is: (“Canadian goods returning”).
Step III - Factory Authorized Service
Once received, each product is carefully inspected and tested. If the product is
under warranty, repairs are completed and the product returned to the owner,
generally within five working days of receipt by the factory.
A product that has been subjected to misuse, neglect or accident or is beyond the
warranty period will be evaluated. The service department will provide the owner’s
representative with a repair cost estimate. Once approved, repairs are completed
and the product returned, generally within five working days.

Guardian Telecom Inc.
7552 10th Street NE
Calgary, Alberta, Canada T2E 8W1
Toll-free 1-800-363-8010
Ph. [phone]
Fax. [phone]
www.guardiantelecom.com
E-mail: mailto:[email protected]
(Click to open message box)
Industrial Communications Worldwide
© Guardian Telecom Inc. 2007