Information subject to change
97-8004167 07-14-17
7224 & 7226 OPERATOR’S MANUAL –
SECTION 4
12
4
Amplifier Operation
4.1 Front-Panel Controls
This section provides an overview of Front-Panel
controls and indicators found on the 7224/7226
amplifier.
4.1.1 Power Switch
The Power Switch controls the AC mains power to
the amplifier. Switch to the ON position (|) to turn
the amplifier on. Switch to the OFF position (O) to
turn the amplifier off. See
Figure 4.1.
The Power Switch also serves as a Breaker. When
the Breaker is tripped, the Power Switch moves to
a neutral position between ON and OFF. To reset
the Breaker, turn the amplifier OFF (O) and then
turn it back ON (I).
4.1.2 Gain Control
The Gain Control Knob increases/decreases the
gain from 0 – 100% of the overall Gain (factory
default Gain is 20). See
Figure 4.2.
4.1.3 Push Buttons
The 7224/7226 provides three front-panel soft-
touch push buttons that control two basic operating
conditions: (1)
Run condition
(the high-voltage
transformers are energized and the unit will am
-
plify the input signal); and (2)
Standby condition
(the low-voltage transformer is energized but the
high-voltage transformers are not and the unit will
not amplifiy the input signal).
By default, the amplifier will automatically enter
the Run condition on power-up. To change the
factory-default setting and configure the amplifier
to power-up in Standby/Stop mode, please see the
Advanced Configuration
section.
The amplifier will enter one of three Standby
modes under the following conditions:
Remote Standby mode (Ready and Standby
LEDs lit):
The amplifier is functioning properly and
all Fault Status modes are clear, but the unit has
been placed in Standby by an external condition.
If an amplifier is disabled using a Remote Standby
application, the amplifier will be placed in Remote
Standby mode. To return the amplifier to a Run
condition, release the Standby condition using the
remote switch. See the
Applications
section of
this manual for more information on remote ampli-
fier operation.
Standby/Fault mode (Standby and one or more
Fault LEDs lit):
The amplifier has been placed in
Standby due to an Output, Overload, Over Temp
or Over Voltage condition. See the section “Fault
Status Indicators” to determine the fault condition
being indicated and the action required to clear the
fault condition.
Standby/Stop mode:
The amplifier has been
placed in Standby due to a Stop order: The Stop
button on the amplifier front panel has been
pushed or the amplifier has been configured to
enter Stop mode on startup. See the
“Advanced
Configuration”
section for information about con-
figuring the amplifier for Startup in Stop mode.
Figure 4.1 – Power Switch
Figure 4.2 – Gain Control
