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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
