Information subject to change
97-8004167 07-14-17
7224 & 7226 OPERATOR’S MANUAL –
SECTION 9
42
9.7
Amplifier Overheats (Over Temp
Fault Condition)
There are two possible reasons why the amplifier
is overheating:
1.
Excessive Power Requirements
2.
Inadequate Airflow
9.7.1 Excessive Power Requirements
An amplifier will overheat if the required power ex
-
ceeds the amplifier’s capabilities. High duty cycles
and low-impedance loads are especially prone to
cause overheating. To see if excess power require
-
ments are causing overheating, check the follow
-
ing:
1.
The application’s power requirements fall
within the specifications of the amplifier. See
the
“Specifications”
section.
2. Faulty output connections and load.
3.
Undesired DC offset at the Output and Input
signal.
If the amplifier chronically overheats with suitable
power/load conditions, then the amplifier may not
be receiving adequate airflow. To check for ad
-
equate airflow, proceed with the following step:
9.7.2
Check for Inadequate Airflow
1.
Check air filters. Over time they can become
dirty and worn out. It is a good idea to clean
the air filters periodically with a mild detergent
and water.
2. Visually inspect fans to assure correct opera-
tion while amplifier is On (I).
Any inoperative, visibly slow, or reverse-spinning
fan should be replaced. Please see the Factory
Service information at the end of this section.
An OverTemp condition places the amplifier in
Standby mode. If the OverTemp pulse is ex-
tremely short, as in the case of defective wiring or
switches, the OverTemp pulse may be too brief to
observe.
9.7.3 Resetting After OverTemp
When the amplifier has cooled enough to eliminate
the OverTemp condition, it should automatically
return to Run mode. If the amplifier fails to return
to Run mode, make sure fans are running, then
remove the input signal from the amplifier. Allow
the fans to run for five minutes, and then push the
Reset button to reset the amplifier. If the amplifier
does not reset, it may require servicing. Please
contact AE Techron Technical Support.
9.8 Fault LED is Illuminated
The 7224/7226 amplifiers contain protection cir
-
cuitry that disables the amplifier if an output stage
is behaving abnormally. This usually indicates an
output transistor has shorted.
To clear the Fault condition, follow these steps:
1.
Turn off the signal source.
2. Turn off the AC mains.
3.
Turn AC mains power back on. If the Fault LED
doesn’t illuminate again, turn the signal source
on.
4.
If the Fault LED is still illuminated and the Fault
condition doesn’t clear, return the amplifier for
Factory Service. Please see the Factory Ser-
vice information at the end of this section.
9.9 Factory Service
If the troubleshooting procedures are unsuccess
-
ful, the amplifier may need to be returned for
Factory Service. All units under warranty will be
serviced free of charge (customer is responsible
for one-way shipping charges as well as any cus
-
Shut off the signal source before reset-
ting the amplifier. Try resetting the Fault
condition only once. If the Fault condi-
tion does not clear after one reset, STOP.
Contact AE Techron Support for further
assistance. repeated resetting can dam-
age the amplifier.
CAUTION
