Amperes AX3800 User manual

Thank you for choosing another quality product om Amperes Electronics.
VER 4 / 2022
AX3800 is now in version 4, which has been improved further to fulfil the demand from installers. Among the enhance-
ments made are cascade connectivity, easier termination and improved circuitries to cater for different types of amplifi-
ers, noticebly Class D power amplifiers.
AX3800 provides a medium for standby amplifier to overtake a failed duty unit automatically without human intervention
to comply with various Codes of Practices such as BS, EN or SS. By means of pilot tone injection at intervals, it ensures
power amplifiers are not loaded all the time to prevent fast aging of the power packs.
Please read through the manual to capture how AX3800 may serve your system diligently and efficiently. We are confi-
dent that you are getting a product of excellence.
AX3800
8 Duty / 1 Auto Amplifier Fault Changeover
AX 3800 amperes
AMP. NORMAL / FAULT
AMP. CHANGEOVER ON/OFF
AMP FAULT ALERT
PILOT TONE
AMP1 AMP2 AMP3 AMP4 AMP5 AMP6 AMP7 AMP8 AMPSTDBY
STANDBY AMPLIFIER CHANGEOVER
Ver.4
View catalogue and for latest
updates

Parts Identification
7
8
9
5
12
10
Front View
1. AMP STATUS LED & CHANGEOVER
2. PILOT TONE LED
3. FAULT ALERT LED AND BUZZER SWITCH
4. SIGNAL INPUT / OUTPUT TERMINALS
PAGE 2 AX3800 Auto Amplifier Fault Changeover
5. SIGNAL LINK SWITCH
Rear View 4
11
AX 3800 amperes
AMP. NORMAL / FAULT
AMP. CHANGEOVER ON/OFF
AMP FAULT ALERT
PILOT TONE
AMP1 AMP2 AMP3 AMP4 AMP5 AMP6 AMP7 AMP8 AMPSTDBY
STANDBY AMPLIFIER CHANGEOVER
1 2 3 4 5 678
ON
1 2 3 4 5 678
ON
CASCADE
INPUT OUTPUT
AMP. BYPASS ADD
LINKOPEN
IN OUT IN OUT
AMP1 AMP2
IN OUT IN OUT
AMP3 AMP4
IN OUT IN OUT
AMP5 AMP6
IN OUT IN OUT
AMP7 AMP8
IN
STDBY
DC 24V
- +
+IN
GND
-IN
+OUT
GND
-OUT
AMP1
+IN
GND
-IN
+OUT
GND
-OUT
AMP2
+IN
GND
-IN
+OUT
GND
-OUT
AMP3
+IN
GND
-IN
+OUT
GND
-OUT
AMP4
+IN
GND
-IN
+OUT
GND
-OUT
AMP5
+IN
GND
-IN
+OUT
GND
-OUT
AMP6
+IN
GND
-IN
+OUT
GND
-OUT
AMP7
+IN
GND
-IN
+OUT
GND
-OUT
AMP8
+OUT
GND
-OUT
STDBY
A B
1 8
16
8
4
2
1
32
64
128
FAULT
NO
CONTACT
RS 485
LINKOPEN LINKOPEN LINKOPEN LINKOPEN LINKOPEN LINKOPEN
BALANCE AUDIO SIGNAL
AMPERES ELECTRONICS
amperes
R
Model : AX3800
MADE IN MALAYSIA
AMP.CHANGEOVER
DC input 24V Max. 500mA
MKII
amperes electronics
another quality product from
12
3
LEDs show status of connected amplifier with :
AMP. NORMAL / FAULT LEDs : Green - normal operating
Red - amplifier faulty
Off - monitoring bypassed
AMP.CHANGEOVER LEDs : Green - faulty and standby amplifier overtake the position of failed duty unit.
Pilot tone indicator which will lit up when 20 kHz pilot tone is sent to all power amplifiers to detect any fault. PT is
sent in intervals to reduce loading effect which may prolong service life of duty units.
Whenever a fault is detected, it shall be indicated by this LED and a buzzer shall be activated. Use this switch to
silence the buzzer. LED will still be lit even the buzzer is off and shall turn off after the fault is rectified.
Audio signal from mixer or matrix controller shall be connected to these terminals before being fed to power amplifi-
ers. IN is for incoming while OUT is going to power amplifier input.
6
If more than one channel / amplifiers are sharing the same input signal, slide the switch to LINK. This shall connect
the input signal to adjacent channel to reduce hardwiring works.
Slide to OPEN if all channels / amplifiers have individual input, such as in Matrix system setup.
The output will still need to be connected to its corresponding amplifier inputs.
6. STANDBY AMPLIFIER INPUT TERMINAL
This terminal is to connect to standby unit’s audio input. There is no incoming terminal as per other channels.

PAGE 3
Parts Identifications ( con’t )
T
12. ADDRESS SWITCH
11. FAULT CONTACT AND DATA TEMINALS
10. DIP SWITCHES FOR UNUSED CHANNELS
8. POWER INPUT TERMINAL
9. AMPLIFIER INPUT AND OUTPUT TERMINALS
7. CASCADE LINK
Port to link more than one AX3800 to enable 1 standby to cater for up to 16 nos of amplifiers. Refer to
section “ Cascading AX3800 ” for details.
AX3800 operates on 24V DC. Use PS9400 power supply unit or regulated power adaptor with 1 A rating.
Outputs from amplifiers are terminated to the IN connectors and the OUT connectors going to zone selectors.
Sensing of amplifier faults shall be at input terminals. For the channels not connected, it should be switched off
at the DIP switch as per item 10.
Channel 1 shall have higher priority for standby takeover than subsequent channels. This is to ensure that ampli-
fier serving highest priority shall be connected to channel with lower number.
When there are channels not connected, push to ON at this DIP switch to bypass the detection activity.
A fault detected at any channel would trigger a relay to provide a dry contact. This contact can be used to link to
external alarm, indication light, etc.
Corresponding RS485 data shall be sent out and can be monitored remotely, such as at PMX Lan through
iPX5500 Comm Box. Refer to section “ Remote Monitoring via PMX LAN ”
For remote monitoring, it is required to address each AX3800 when there are more than one installed. Units
are addressed using BCD code, as shown below :
Unit no.1 1000 0000
Unit no.2 0100 0000
Unit no.3 1100 0000
Unit no.4 0010 0000
AX3800 Auto Amplifier Fault Changeover

General Schematic : Single Source Setup
PAGE 4
The above schematic is typical for single audio source application. For uninterrupted paging ( 2 audio sources ), connect
according to setup using Matrix.
Audio signal to Duty Amplifiers shall be looped., or can be fed separately from AX3800.
If more than 8 duty amplifiers to be served with 1 standby, cascade AX3800 accordingly.
POWER
OFF SELECT
TUNER
CD
CASS
OFF
MASTER
MUSICSOURCE
SIGIN
BASS MAXMIN
EXTINPUT
MAX MAXMIN
SOURCE
MIN
SIGIN
CHIME MIXER TREBLE
MAXMIN
TONECTRL
CH5 CH6CH4
SIGINSIGIN SIGIN
MAXMIN MAXMIN MIN
CH3CH1 CH2
SIGINSIGIN
MAXMIN MAXMIN MAXMIN MAX
AUX
SIGIN
PREAMPLIFIER MIXER
amperes
MX2222 O
I
amperes
amperes
SPEAKERVOLUME
OVERIDE
OFF
1
2 3
4
5
EP 1200 amperes
EMERGENCY PAGINGPANEL
MIC
SIRENSWITCH
EMERGENCY/ SIREN ACTIVE
SIREN
FIRE
ZS 5601 amperes
SPEAKER ZONE SELECTOR
21 3 54 6 ALL CALL
PAGINGZONE SELECTION
OVERRIDE
OVERRIDE
AX 3800 amperes
AMP.NORMAL / FAULT
AMP.CHANGEOVER ON/OFF
AMPFAULT ALERT
PILOTTONE
AMP1 AMP2 AMP3 AMP4 AMP5 AMP6 AMP7 AMP8 AMPSTDBY
STANDBYAMPLIFIER CHANGEOVER
O
I
POWER
PUBLICADDRESS POWER AMPLIFIER
SIGNAL-40 dB
SIGNAL-10 dB
POWER
PROTECT
CLIP
480 Watts
amperes
PA 2480
O
I
POWER
PUBLICADDRESS POWER AMPLIFIER
SIGNAL-40 dB
SIGNAL-10 dB
POWER
PROTECT
CLIP
480 Watts
amperes
PA 2480
O
I
POWER
PUBLICADDRESS POWER AMPLIFIER
SIGNAL-40 dB
SIGNAL-10 dB
POWER
PROTECT
CLIP
480 Watts
amperes
PA 2480
SPEAKERVOLUME
OVERIDE
OFF
1
2 3
4
5
SPEAKERVOLUME
OVERIDE
OFF
1
2 3
4
5
amperes
amperes
O
I
POWER
PUBLICADDRESS POWER AMPLIFIER
SIGNAL-40 dB
SIGNAL-10 dB
POWER
PROTECT
CLIP
480 Watts
amperes
PA 2480
Input Sources
Pre-amplifier Mixer
Emergency Paging Panel
AX3800
Duty Amp 1
Duty Amp 2
Duty Amp 8
Standby Amp
Speaker Zone Selector
Speakers
Volume Controllers
Zone 1 to ...
line audio
line audio
line audio
S/By out
100V
100V
100V
100V
100V
100V 24V DC Override
AX3800 Auto Amplifier Fault Changeover

PAGE 5
General Schematic : Matrix
amperes
amperes
SPEAKERVOLUME
OVERIDE
OFF
1
2 3
4
5
EP 1200 amperes
EMERGENCY PAGINGPANEL
MIC
SIRENSWITCH
EMERGENCY/ SIREN ACTIVE
SIREN
FIRE
ZS 5601 amperes
SPEAKER ZONE SELECTOR
21 3 54 6 ALL CALL
PAGINGZONE SELECTION
OVERRIDE
OVERRIDE
AX 3800 amperes
AMP.NORMAL / FAULT
AMP.CHANGEOVER ON/OFF
AMP FAULTALERT
PILOT TONE
AMP1 AMP2 AMP3 AMP4 AMP5 AMP6 AMP7 AMP8 AMPSTDBY
STANDBYAMPLIFIER CHANGEOVER
O
I
POWER
PUBLIC ADDRESS POWER AMPLIFIER
SIGNAL-40 dB
SIGNAL-10 dB
POWER
PROTECT
CLIP
480 Watts
amperes
PA 2480
O
I
POWER
PUBLIC ADDRESS POWER AMPLIFIER
SIGNAL-40 dB
SIGNAL-10 dB
POWER
PROTECT
CLIP
480 Watts
amperes
PA 2480
O
I
POWER
PUBLIC ADDRESS POWER AMPLIFIER
SIGNAL-40 dB
SIGNAL-10 dB
POWER
PROTECT
CLIP
480 Watts
amperes
PA 2480
SPEAKERVOLUME
OVERIDE
OFF
1
2 3
4
5
SPEAKERVOLUME
OVERIDE
OFF
1
2 3
4
5
amperes
amperes
O
I
POWER
PUBLIC ADDRESS POWER AMPLIFIER
SIGNAL-40 dB
SIGNAL-10 dB
POWER
PROTECT
CLIP
480 Watts
amperes
PA 2480
VOLUME
12 x 8 EHTERNET MATRIXCONTROLLER
amperes
MENU
ENTER
PREV NEXT
ACTIVITY
STATUS
FAULT
MONITORSPEAKER
M P 2288
x
POWER
O
I
Input Sources
Matrix Controller
Emergency Paging Panel
Line audio
Line audio
Line audio
Duty Amp 1
Duty Amp 2
Duty Amp 8
Standby Amp
Line out 1
Line out 8
Standby Out
100V
100V
100V 24V OR
Speaker Zone 1 to ...
AX3800
The above schematic is a typical setup for multiple input sources / uninterrupted or matrix system. It is clearly noted
that each amplifier input shall connect to individual output channel from AX3800.
Cascade AX3800 if one standby is to serve more than 8 power amplifiers.
Speaker Zone Selector
AX3800 Auto Amplifier Fault Changeover

Connecting the Unit - Audio Inputs & Outputs
PAGE 6
1 2 3 4 5 678
ON
1 2 3 4 5 678
ON
AMP. BYPASS ADD
LINKOPEN
IN OUT IN OUT
AMP1 AMP2
IN OUT IN OUT
AMP3 AMP4
IN OUT IN OUT
AMP5 AMP6
IN OUT IN OUT
AMP7 AMP8
IN
STDBY
DC 24V
- +
+IN
GND
-IN
+OUT
GND
-OUT
AMP1
+IN
GND
-IN
+OUT
GND
-OUT
AMP2
+IN
GND
-IN
+OUT
GND
-OUT
AMP3
+IN
GND
-IN
+OUT
GND
-OUT
AMP4
+IN
GND
-IN
+OUT
GND
-OUT
AMP5
+IN
GND
-IN
+OUT
GND
-OUT
AMP6
+IN
GND
-IN
+OUT
GND
-OUT
AMP7
+IN
GND
-IN
+OUT
GND
-OUT
AMP8
+OUT
GND
-OUT
STDBY
A B
1 8
16
8
4
2
1
32
64
128
FAULT
NO
CONTACT
RS 485
LINKOPEN LINKOPEN LINKOPEN LINKOPEN LINKOPEN LINKOPEN
BALANCE AUDIO SIGNAL
Audio
input 1
Audio
input 2
Audio
input 3
Audio
input 4
To
amplifier
input 1
To
amplifier
input 2
To
amplifier
input 3
To
amplifier
input 4
To
amplifier
input 7
To
standby
amplifier
input
Link
Switch
1
Link
Switch
2
Link
Switch
6
The above connections illustrates connections between input signals from BGM sources such as Pre-amplifier mixer or
Matrix controller to the inputs of power amplifiers.
Audio source 1 shall feed to amplifier 1 :
- Link switch 1 shall be switched to OPEN position
Audio source 2 shall feed to amplifier 2 - 5 :
- Link switch 2, 3 and 4 shall be switched to LINK position
- Link switch 1 and 5 shall be OPEN to for isolation from audio input 3
As power amplifier 6 does not share the same audio source from BGM 3 and 4, both link switch 5 and 6 shall be in
OPEN position.
There is no incoming connection at the last connector for standby but the input at standby amplifier shall be connected
to STANDBY terminal.
Standby amplifier
terminal
If only a single audio source is used to cater for all amplifiers :
In this case, only connect the input at terminal Amplifier 1 and switch to LINK at all link switches.
Input and output signals from AX3800 shall have unity gain. Every output to amplifiers has been buffered and therefore
signal degradation due to multiple looping shall not occur from AX3800.
However, a single output from this terminal should not be fed to more than 6 amplifier to avoid signal drop. We recom-
mend that all outgoing outputs are used.
AX3800 Auto Amplifier Fault Changeover

Connecting the Unit - Amplifier Inputs - Outputs
PAGE 7
1 2 3 4 5 678
ON
1 2 3 4 5 678
ON
AMP. BYPASS ADD
LINKOPEN
IN OUT IN OUT
AMP1 AMP2
IN OUT IN OUT
AMP3 AMP4
IN OUT IN OUT
AMP5 AMP6
IN OUT IN OUT
AMP7 AMP8
IN
STDBY
DC 24V
- +
+IN
GND
-IN
+OUT
GND
-OUT
AMP1
+IN
GND
-IN
+OUT
GND
-OUT
AMP2
+IN
GND
-IN
+OUT
GND
-OUT
AMP3
+IN
GND
-IN
+OUT
GND
-OUT
AMP4
+IN
GND
-IN
+OUT
GND
-OUT
AMP5
+IN
GND
-IN
+OUT
GND
-OUT
AMP6
+IN
GND
-IN
+OUT
GND
-OUT
AMP7
+IN
GND
-IN
+OUT
GND
-OUT
AMP8
+OUT
GND
-OUT
STDBY
A B
1 8
16
8
4
2
1
32
64
128
FAULT
NO
CONTACT
RS 485
LINKOPEN LINKOPEN LINKOPEN LINKOPEN LINKOPEN LINKOPEN
BALANCE AUDIO SIGNAL
From
Amp
Output 1
To Zone Selector
From
standby
amplifier
output
Channel bypass DIP
Switches
When connecting amplifier outputs to 100V section at the terminals, ensure the polarity of termination is correct. This is
to avoid short circuit which may damage the amplifier.
Amplifier output must be connected to IN terminals, and the outgoing to Zone Selector at OUT sections. Reversing them
will cause AX3800 to treat the channel as failed.
Each output of the amplifier must be terminated for monitoring. A disconnected channel shall be deemed fail.
For unused channels :
It is quite common that not all channels will be utilised in a system. Switch off the unused channel with corresponding
switch at DIP Switch.
AX3800 Auto Amplifier Fault Changeover

PAGE 8
Cascading AX3800
1 2 3 4 5 678
ON
1 2 3 4 5 678
ON
CASCADE
INPUT OUTPUT
AMP. BYPASS ADD
IN
STDBY
+IN
GND
-IN
+OUT
GND
-OUT
AMP6
+IN
GND
-IN
+OUT
GND
-OUT
AMP7
+IN
GND
-IN
+OUT
GND
-OUT
AMP8
+OUT
GND
-OUT
STDBY
A B
1 8
16
8
4
2
1
32
64
128
FAULT
NO
CONTACT
RS 485
LINK
OPEN LINK OPEN LINK OPEN
amperes electronics
another quality product from
1 2 3 4 5 678
ON
1 2 3 4 5 678
ON
CASCADE
INPUT OUTPUT
AMP. BYPASS ADD
IN
STDBY
+IN
GND
-IN
+OUT
GND
-OUT
AMP6
+IN
GND
-IN
+OUT
GND
-OUT
AMP7
+IN
GND
-IN
+OUT
GND
-OUT
AMP8
+OUT
GND
-OUT
STDBY
A B
1 8
16
8
4
2
1
32
64
128
FAULT
NO
CONTACT
RS 485
LINK
OPEN LINK OPEN LINK OPEN
amperes electronics
another quality product from
1 2 3 4 5 678
ON
1 2 3 4 5 678
ON
CASCADE
INPUT OUTPUT
AMP. BYPASS ADD
IN
STDBY
+IN
GND
-IN
+OUT
GND
-OUT
AMP6
+IN
GND
-IN
+OUT
GND
-OUT
AMP7
+IN
GND
-IN
+OUT
GND
-OUT
AMP8
+OUT
GND
-OUT
STDBY
A B
1 8
16
8
4
2
1
32
64
128
FAULT
NO
CONTACT
RS 485
LINKOPEN LINKOPEN LINKOPEN
amperes electronics
another quality product from
When it is required that one standby amplifier to serve more than 8 duty units, AX3800 will need to be stacked up or
cascaded. The link between them has been made simpler using RJ45 connectors.
Unit # 1
Unit # 2
Unit # 3
Cat5e
Cat5e
To standby amplifier
audio input
From standby amplifier
100V output Loop to next
AX3800
Loop to next
AX3800
Only the connections for standby
amplifiers are shown. Inputs and
outputs of duty amplifier are
shown in previous page
Highest priority
( Channel 1 )
Higher priority at Ch1 of
Unit 2, but lower than Unit
# 1
Lowest priority at Ch.8 of Unit 3.
We do not recommend more than 3 AX3800 to be cascaded, which means a standby amplifier will need to cater for
up to 24 duty amplifiers. This may interrupt the operation of overall system if more than one duty unit failed.
In cascade mode, Unit #1 shall have higher priority than Unit #2 and #3, while Unit #2 shall be on top of #3. This
means Ch.1 at Unit #1 shall have highest priority and Ch.8 at Unit #3 shall have the lowest.
In the situation where more than 2 duty failed, with lower priority channel is required to operate, switch the DIP Switch
at the one with higher priority to allow the lower unit to bypass.
Link all
inputs
Link all
inputs
AX3800 Auto Amplifier Fault Changeover

Remote Monitoring / Data Transmission via LAN
PAGE 9
1 2 3 4 5 678
ON
1 2 3 4 5 678
ON
CASCADE
INPUT OUTPUT
AMP.BYPASS ADD
+OUT
GND
-OUT
+IN
GND
-IN
+OUT
GND
-OUT
AMP7
+IN
GND
-IN
+OUT
GND
-OUT
AMP8
+OUT
GND
-OUT
STDBY
A B
1 8
16
8
4
2
1
32
64
128
FAULT
NO
CONTACT
RS 485
LINK
OPEN LINK OPEN
AMPERES ELECTRONICS
amperes
R
Model : AX3800
MADE IN MALAYSIA
AMP.CHANGEOVER
DC input 24V Max. 500mA
MKII
amperes electronics
another quality product from
iPX 5500
ETHERNET COMM BOX
EHTERNETADDRESS
ETHERNET
RESET
amperes
CONTAC T
N/ O
TRIGGER
A
RS485 B
1 2 3 4 5 678
ON
1 2 3 4 5 678
ON
CASCADE
INPUT OUTPUT
AMP.BYPASS ADD
+OUT
GND
-OUT
+IN
GND
-IN
+OUT
GND
-OUT
AMP7
+IN
GND
-IN
+OUT
GND
-OUT
AMP8
+OUT
GND
-OUT
STDBY
A B
1 8
16
8
4
2
1
32
64
128
FAULT
NO
CONTACT
RS 485
LINK
OPEN LINK OPEN
AMPERES ELECTRONICS
amperes
R
Model : AX3800
MADE IN MALAYSIA
AMP.CHANGEOVER
DC input 24V Max. 500mA
MKII
amperes electronics
another quality product from
PC with monitoring
software / PMX LAN
Amperes iPX5500
Comm.Box
AX3800 Unit # 1
AX3800 Unit # 2
RS485
Loop to
next
AX3800
Address Setting
Address Setting
Ethernet / LAN
AX3800 can be remotely monitored by external software to check condition of the amplifiers as well as notification when-
ever a duty amplifier failed.
RS485 data is provided which can be directly connected to local PC via RS485-232 converter or through network via
Amperes iPX5500 Communication Box.
Application with iPX5500 can be from single or multiple locations. When there are several AX3800 connected, it is
important to set the address correctly with each AX3800 assigned to a unique number.
API can be obtained for 3rd party software integration.
Fault Detection
AX3800 may work a little different from other auto standby amplifier fault changeover. It sends Pilot Tones of 20 kHz to
amplifiers at intervals and shift from one channel to another to reduce loading strain. A slight delay in detection shall
occur but is more beneficial in the long run, prolonging the life span of amplifiers.
Whenever Pilot Tone is sent out, a PT Active LED at front panel shall lit.
Pilot Tones
AX3800 detects availability of returning Pilot Tones at every channel. Missing Pilot Tone shall be interpreted as faulty
amplifier at that particular channel.
A minimum level of 50V signal must be presence to avoid unnecessary fault diagnosis. Thereby, it is recommended that
all amplifiers’ output levels be set to minimum 50%.
Fault Detection
Any faulty channel shall be indicated by top row of LEDs ( AMP.NORMAL / FAULT ) to red. A fault shall be accompanied
by AMP FAULT ALERT LED and also switchable buzzer switch. Concurrently, a data string shall be transmitted ( RS485
) along with activation of a dry contact.
As only one channel is allowed for changeover, which is to prevent overloading, only one LED shall lit at the second row
of LEDs. ( AMP. CHANGEOVER ).
Fault Changeover and Indication
AX3800 Auto Amplifier Fault Changeover

PAGE 10
Testing the Installation
Follow the simple guidelines below to test the function of standby amplifier changeover when the duty amplifier failed.
Power up :
Connect 24V DC from centralised power supply unit, ie. Amperes PS9400. If the unit is to operate using power adap-
tor, use 24V DC type with 1 A rating. Usage of unregulated power supply may damage the equipment.
When AX3800 is powered up, it will take approximately 10 seconds to test all connected amplifiers. Green LED
indicates that the amplifier is normal and red is the amplifier is faulty.
Test Detection Fault at Individual Channel
Switch OFF the power of amplifier at
Ch. 1
When Pilot Tone LED lits, AMP 1 LED will turn red. AMP.CHANGEOVER
LED will lit to indicate the amplifier connected is faulty.
Press the buzzer button ON and OFF to ensure switch and the buzzer is
working.
Switch ON the power amplifier at Ch.1 When the Pilot Tone LED lits again, AMP 1 LED will turn green. Buzzer
will turn off.
Repeat the above steps for Ch.2 to 8
Test Priority Function
Channel 1 shall have the highest priority over others, so as Ch.2 over 3 and so forth. Thereby, always install amplifier
with highest priority at lower numbered channel. To protect standby amplifier, only 1 failed duty amplifier is allowed for
changeover at any one time.
Switch OFF the power amplifier at Ch. 8 When PT lits, AMP.8 LED will turn red and Changeover LED turn green,
accompanied by buzzer.
Switch OFF the power amplifier at Ch. 7
while amplifier at Ch.8 still OFF
AMP.7 and AMP.8 LED will both turn red and Amp.Changeover LED at
Ch.7 will lit and Ch.8 off. Standby replacement is now at Ch.7 since it has
higher priority.
Switch OFF the power amplifier at Ch. 6
while amplifier at Ch.7 and 8 still OFF
AMP6, AMP.7 and AMP.8 LEDs will turn red. Amp.Changeover LED at
Ch.6 will lit and Ch.7 and 8 off. Now, standby unit is replacing the duty
amplifier position of Ch. 7 and 8.
Repeat the above process for other amplifiers and should observe the same pattern, each time with lower numbered
channel connected to standby unit, replacing higher numbered ones.
Amplifier Recovery Function
Will all amplifiers at faulty state, here we shall recover these amplifiers one at a time and observe the LED response.
Switch On power amplifier at Ch.1, when Pilot Tone lits, AMP.1 LED shall turn green and AMP.CHANGEOVER LED 2
shall lit, to indicate that the standby changeover is now at Ch. 2.
Repeat the above steps for subsequent channels until all AMP.1 to AMP.8 LEDs are green and AMP.CHANGEOVER
LEDs are Off.
AX3800 Auto Amplifier Fault Changeover

Summary of Features
PAGE 11
Cater for 8 duty and 1 standby
Expandable for 1 standby to cater for more than 8 duty amps.
Built in Pilot Tone generator, transmit in intervals and senses at sequence to protect
amplifiers
Overloading protection by allowing only a single take over
Prioritised changeover where the lower numbered amplifier shall be preferred for
take over if more than two units are down
Short fault detection time within 20 seconds
Changeover at input and output section simultaneously ; suitable for matrix system
installations
Input link switch ; making connection of channels sharing the same source easier
Channel isolation switch for unused or un-monitored channel
Individual channel status indicators ; normal, fault and changeover status
Technical Specifications
Operating voltage
Power consumption
Input impedance
Audio output gain
Pilot tone interval
Pilot tone frequency
Detection line
Detection level
Failure detection time
Failure recovery time
Zone load rating
Status indication LED
Changeover alert
Changeover section
Dimensions ( W x H X D )
24V DC ; 1A
6.8 W ( 0.3 A )
8 Ch balanced line signal
10 k Ohm
Unity
8 seconds / channel
20 KHz ( +/- 5% ) kHz
70 / 100 V line
50 V rms min
20 seconds ( max )
20 seconds ( max )
500W 100V line max ( 1000W on request )
Normal ; Fault ; Changeover
Buzzer with switch
Input and output simultaneously
482 x 88 x 180 mm
3.15 kg
Standby consumption 2.4 W ( 0.1 A )
Weight
AX3800 Auto Amplifier Fault Changeover

Warranty Conditions
Disclaimer
AMPERES ELECTRONICS SDN BHD
MADE IN MALAYSIA
Published : JAN 2022
ISO 9001: 2015
Design & Manufacture of Public Address Equipment and Systems
Certicate No. 16895 / A / 0001 / UK / En
Information contained in this manual is subject to change without prior notice and does not represent a
commitment on the part of the vendor. AMPERES ELECTRONICS SDN BHD shall not be liable for any
loss or damages whatsoever arising from the use of information or any error contained in this manual.
It is recommended that all services and repairs on this product be carried out by AMPERES
ELECTRONICS SDN BHD or its authorized service agents.
AMPERES series must only be used for the purpose they were intended by the manufacturer and in
conjunction with this operating manual.
AMPERES ELECTRONICS SDN BHD cannot accept any liability whatsoever for any loss or damages
caused by service, maintenance or repair by unauthorized personnel, or by use other than that intended by
the manufacturer.
Only Amperes Electronics Service Centres are allowed to make warranty repairs : a list of Amperes
Electronics Service Centres may be asked for by the purchaser or send directly to Amperes Electronics
Sdn Bhd at 70 Jalan Industri PBP 3, Tmn Perindustrian Pusat Bandar Puchong, 47100, Puchong, Selangor,
Malaysia or its authorized dealers. This warranty is not valid if repairs are performed by unauthorized
personnel or service centres.
This warranty covers only repairs and replacement of defective parts ; cost and risks of transportation as
well as removal and installation of the product from the main system are for the account of the purchaser.
This warranty shall not extend to the replacement of the unit.
This warranty does not cover damages caused by misuse, neglect, accident of the product as well as using
the product with power supply voltage other than what is shown on the product, or any other power supply
source / adaptor not recommended by the manufacturer.
This warranty does not cover damages caused by fire, earthquakes, floods, lightning and every other cause
not directly related to the unit.
This warranty does not include any indemnity in favor of the purchaser or the dealer for the period of usage
of the unit. The warranty also does not cover any damages which may inflict to people and things when
using the product.
This warranty certificate is valid only for the described product, and is not valid if modifications are made on
this certificate or on the identification label applied on the product.
This warranty covers all the material and manufacturing defects and is valid for a period of 36 months from
the date of purchase or for a specified period in countries where it is stated by a national law. In this case,
the extension is valid only in the country where the product is purchased.
Amperes Electronics Sdn Bhd is not obliged to modify previously manufactured products under warranty if
the design changes or improvements are made.