Aetechron 7224 User manual

7224
Operator’s Manual
Single-Channel Industrial Amplier for Demanding, High-Power Systems
574.295.9495 | www.AETechron.com
2507 Warren Street, Elkhart, IN 46516

Limited One-Year Warranty
HOW TO OBTAIN WARRANTY SERVICE
When you notify us of your need for warranty service,
we will give you an authorization to return the product
for service. All components must be shipped in a factory
pack or equivalent which, if needed, may be obtained
from us for a nominal charge. We will take corrective ac-
tions within a reasonable time of the date of receipt of
the defective product. If the repairs made by us are not
satisfactory, notify us immediately.
DISCLAIMER OF CONSEQUENTIAL AND
INCIDENTAL DAMAGES
You are not entitled to recover from us any consequen-
tial or incidental damages resulting from any defect in
our product. This includes any damage to another prod-
uct or products resulting from such a defect.
WARRANTY ALTERATIONS
No person has the authority to enlarge, amend, or
modify this warranty. The warranty is not extended by
the length of time for which you are deprived of the use
of this product. Repairs and replacement parts provided
under the terms of this warranty shall carry only the
unexpired portion of this warranty.
DESIGN CHANGES
We reserve the right to change the design of any
product from time to time without notice and with no
obligation to make corresponding changes in products
previously manufactured.
LEGAL REMEDIES OF PURCHASER
There is no warranty that extends beyond the terms
hereof. This written warranty is given in lieu of any oral
or implied warranties not contained herein. We disclaim
all implied warranties, including, without limitation, any
warranties of merchantability or tness for a particular
purpose. No action to enforce this Warranty shall be
commenced later than ninety (90) days after expiration
of the warranty period.
AE Techron, Inc.
Customer Service Department
2507 Warren Street
Elkhart, IN 46516
U.S.A.
574.295.9495
www.aetechron.com
SUMMARY OF WARRANTY
AE TECHRON INC. of Elkhart, Indiana (Warrantor) war-
rants to you, the ORIGINAL COMMERCIAL PURCHASER
ONLY of each NEW AE TECHRON INC. product, for a
period of one (1) year from the date of purchase, by the
original purchaser (warranty period) that the product
is free of defects in materials or workmanship and will
meet or exceed all advertised specications for such a
product. This warranty does not extend to any subse-
quent purchaser or user, and automatically terminates
upon your sale or other disposition of our product.
ITEMS EXCLUDED FROM WARRANTY
We are not responsible for product failure caused by
misuse, accident or neglect. This warranty does not
extend to any product on which the serial number has
been defaced, altered, or removed. It does not cover
damage to loads or any other products or accessories
resulting from AE TECHRON INC. product failure. It does
not cover defects or damage caused by the use of unau-
thorized modications, accessories, parts, or service.
WHAT WE WILL DO
We will remedy, at our sole discretion, any defect in
materials or workmanship by repair, replacement, or
refund. If a refund is elected, you must make the defec-
tive or malfunctioning component available to us free
and clear of all liens or other encumbrances. The refund
will be equal to the actual purchase price, not includ-
ing interest, insurance, closing costs, and other nance
charges less a reasonable depreciation on the product
from the date of original purchase. Warranty work can
only be performed at our authorized service centers or
at our factory. Expenses in remedying the defect will be
borne by AE TECHRON INC., including one-way surface
freight shipping costs within the United States. (Pur-
chaser must bear the expense of shipping the product
between any foreign country and the port of entry in the
United States and all taxes, duties, and other customs
fees for such foreign shipments.)

DECLARATION OF CONFORMITY
Technical Construction File Route
Issued By: AE Techron, Inc. For Compliance Questions Only: Larry Shank
2507 Warren Street 574-295-9495
Elkhart, IN 46516 [e-mail]
Equipment Type: Industrial Power Amplifiers
Model Name: 7224
EMC Standards:
EN 61326-1: 2013 –Electrical Equipment for Measurement, Control and Laboratory use
—EMC Requirements
EN 55011: 2009 + A1: 2010 –Industrial, Scientific and Medical (ISM) radio-frequency equipment
—Radio disturbance characteristics
—Limits and methods of measurement
EN 61000-4-2: 2009 –Electromagnetic compatibility (EMC) Part 4: Testing and measurement techniques:
Electrostatic discharge immunity test
EN 61000-4-3: 2006 + A2: 2010 –Electromagnetic compatibility (EMC) Part 4: Testing and measurement techniques:
Radiated radio-frequency electromagnetic field immunity test
EN 61000-4-4: 2004 + A1: 2010 –Electromagnetic compatibility (EMC) Part 4: Testing and measurement techniques:
Electrical fast transient/burst immunity test
EN 61000-4-5: 2006 –Electromagnetic compatibility (EMC) Part 4: Testing and measurement techniques:
Surge immunity test
EN 61000-4-6: 2009 –Electromagnetic compatibility (EMC) Part 4: Testing and measurement techniques:
Immunity to conducted disturbances induced by radio frequency field
EN 61000-4-8: 2010 –Electromagnetic compatibility (EMC) Part 4: Testing and measurement techniques:
Power frequency magnetic field immunity test
Safety Standard:
BSEN61010-1:2010 (inc Corr. May 2011) –Safety requirements for electrical equipment for measurement, control, and laboratory use
I certify that the product identified above conforms to the requirements of the EMC Council Directive 2014/30/EU, and the Low Voltage Directive 2006/95/EC.
Signed:
Larry Shank
President Date of Issue: October 8, 2014

Contents
1 Introduction ....................................................................................................................................6
1.1 Features ................................................................................................................................6
2 Amplier Setup...............................................................................................................................7
2.1 Safety First ............................................................................................................................7
2.2 Unpacking .............................................................................................................................7
2.3 Installation .............................................................................................................................7
2.4 Connecting the Load .............................................................................................................8
2.5 Connecting the Input Signal ..................................................................................................8
2.6 Connecting the AC Supply ....................................................................................................9
2.7 Start-up Procedure..............................................................................................................10
3 Amplier Operation ......................................................................................................................11
3.1 Front-Panel Controls ...........................................................................................................11
3.2 Front-Panel Indicators.........................................................................................................12
3.3 Back-Panel Controls and Connectors .................................................................................15
4 Advanced Conguration...............................................................................................................18
4.1 Conguration Access Panel ................................................................................................18
4.2 Conguration Settings Located on the Main Board.............................................................18
4.3 Conguration Settings Located on the Power Supply Board ..............................................21
5 Applications..................................................................................................................................24
5.1 Remote Status and Control using the SIM Interlock I/O Connector....................................24
5.2 Controlled Current Operation ..............................................................................................28
5.3 Multi-amplier Systems .......................................................................................................32
6 Amplier Signal Flow....................................................................................................................37
6.1 Input Signals........................................................................................................................37
6.2 AC Mains Power..................................................................................................................37
7 Maintenance ................................................................................................................................38
7.1 Clean Amplier Filter and Grills ...........................................................................................38
8 Troubleshooting ...........................................................................................................................39
8.1 Introduction & Precautions ..................................................................................................39
8.2 Visual Inspection .................................................................................................................39
8.3 No Signal.............................................................................................................................40
8.4 No LEDs Illuminated or No Fans.........................................................................................40
8.5 OverVoltage LED Lit............................................................................................................40
8.6 Standby LED Remains Illuminated......................................................................................40
8.7 Amplier Overheats (Over Temp Fault Condition)...............................................................41
8.8 Fault LED is Illuminated ......................................................................................................41
8.9 Factory Service ...................................................................................................................41
9 Specications...............................................................................................................................43

List of Figures
List of Figures
Figure 1.1 – 7224 Front Panel.............................................................................................................6
Figure 2.1 – 7224 Back Panel .............................................................................................................8
Figure 2.2 – Connecting the Load .......................................................................................................8
Figure 2.3 – Closeup of the Output Terminals .....................................................................................8
Figure 2.4 – Closeup of SIM card........................................................................................................9
Figure 2.5 – Wiring for Unbalanced or Balanced Input Connector......................................................9
Figure 2.6 – Closeup of AC Mains Outlet ..........................................................................................10
Figure 2.7 – Sample of Congurations Setting Label........................................................................10
Figure 3.1 – Power Switch.................................................................................................................11
Figure 3.2 – Gain Control ..................................................................................................................11
Figure 3.3 – Push Buttons.................................................................................................................11
Figure 3.4 – Indicators.......................................................................................................................12
Figure 3.5 – Main Status Indicators for Stand-Alone Ampliers ........................................................12
Figure 3.6 – Fault Status Indicators for Stand-Alone Ampliers ........................................................13
Figure 3.7 – Main Status Indicators for Multi-Amplier Systems.......................................................14
Figure 3.8 – Fault Status Indicators for Multi-Amplier Systems.......................................................15
Figure 3.9 – Back Panel Controls and Connectors ...........................................................................17
Figure 4.1 – Access Panel Screw Locations .....................................................................................18
Figure 4.2 – Main Board Location Inside Access Panel ....................................................................19
Figure 4.3 – Master/Slave Setting .....................................................................................................19
Figure 4.4 – Gain Trim Control ..........................................................................................................19
Figure 4.5 – Controlled-Voltage/Controlled-Current Mode Setting ....................................................20
Figure 4.6 – Compensation Setting...................................................................................................20
Figure 4.7 – Run Mode/Stop Mode on Power-Up Setting .................................................................20
Figure 4.8 – Standby Mode on Over Temp Setting ...........................................................................21
Figure 4.9 – Standby Mode on Over Load Setting ............................................................................21
Figure 4.11 – Location of Amplier High-Voltage Transformer Sockets ............................................22
Figure 4.10 – Accessing the Power Supply Board ............................................................................22
Figure 4.12 – J3 and J7 Plug Locations for High-Current Output......................................................22
Figure 4.13 – J4 and J8 Plug Locations for High-Voltage Output .....................................................22
Figure 4.14 – Bi-Level Power Switch Location..................................................................................23
Figure 5.1 – Remote Status and Control Pinouts..............................................................................24
Figure 5.2 – Remote Run/Standby Monitor.......................................................................................24
Figure 5.3 – Remote Status and Reset Schematic ...........................................................................25
Figure 5.4 – Remote Enable/Standby ...............................................................................................26
Figure 5.5 – Remote Voltage Monitoring ...........................................................................................27
Figure 5.6 – Remote Current Monitoring...........................................................................................27
Figure 5.7 – Remote Current Monitoring, Alternate Method..............................................................28
Figure 5.8 – Input to Output Comparison, Controlled-Voltage Operation..........................................28
Figure 5.9 – Input to Output Comparison, Controlled-Current Operation..........................................29
Figure 5.10 – Factory-installed Default RC Network .........................................................................29
Figure 5.11 – Custom Compensation Location .................................................................................31
Figure 5.12 – Compensation Effects on Waveform ...........................................................................31
Figure 5.13 – Square Wave Showing a Decrease in R is Required..................................................32
Figure 5.14 – Square Wave Showing an Increase in R is Required .................................................32
Figure 5.15 – Square Wave Showing an Increase in C is Required .................................................32
Figure 6.1 – Board-Level Functional Block Diagram.........................................................................37
Figure 8.1 – +Vcc and –Vcc Point Locations.....................................................................................39
Figure 8.2 – Fuse F1 Location...........................................................................................................40
Figure 8.3 – Interlock I/O Connector .................................................................................................40
Figure 9.1 – Voltage Potential vs. Frequency....................................................................................45
Figure 9.2 – Frequency Response ....................................................................................................45
Figure 9.3 – Noise vs. Frequency......................................................................................................45
Figure 9.4 – Continuous Power vs. Frequency .................................................................................45
Figure 9.5 – Thermal Performance....................................................................................................45
Figure 9.6 – DO 160 Section 18.2 AC Power Processing .................................................................45
Figure 9.7 – DC Current Over Time at 13.5 VDC ..............................................................................46
Figure 9.8 – DC Current Over Time, 2-ohm Load .............................................................................46
Figure 9.9 – DC Current Over Time, 3-ohm Load .............................................................................46
Figure 9.10 – DC Current Over Time, 4-ohm Load ...........................................................................46
Figure 9.11 – DC Current Over Time, Comparison with 4-ohm Load................................................46

Information subject to change 97-7224006_3-31-15
7224 OPERATOR’S MANUAL – SECTION 1
6
1 Introduction
Congratulations on your purchase of the 7224 AE
Techron power amplier—one of the most precise
power ampliers ever produced for industrial ap-
plications and testing. The 7224 ampliers are built
and tested to the most stringent quality standards
for long life and outstanding performance. The AE
Techron brand is known throughout the world for
its robust precision ampliers as well as its product
service and support.
1.1 Features
The 7224 is a single-channel linear amplier de-
signed for use in demanding applications requir-
ing low noise, low distortion, and accurate power
amplication from DC to 300 kHz. They feature:
• Frequency bandwidth of DC to 300 kHz at
rated power.
• Continuous output of over 1,100 watts RMS at
4 ohms.
• 40 mSec pulses of up to 52 amperes peak into
a 0.5 ohm load.
• System output of over 4,000 watts or over 200
amperes maximum is possible with multiple,
interconnected amplifiers.
• Efficient design and light weight chassis materi-
als allow amplifier to occupy only 2U height,
and weigh only 41 lbs.
• Robust, linear power supply results in extreme-
ly low noise; bi-level switch design limits heat
dissipation to output devices.
• Protection circuitry protects the AE Techron
7224 from input overloads, improper output
connection (including shorted and improper
loads), over-temperature, over-current, and
supply voltages that are too high or low.
• 7224 with “P” option offers precision control of
output offset, DC drift and gain linearity.
• Shipped ready to operate from 120-volt (±10%)
single-phase AC mains; 220/240-volt model
available on request.
Figure 1.1 – 7224 Front Panel

97-7224006_3-31-15 Information subject to change 7
7224 OPERATOR’S MANUAL – SECTION 2
2 Amplier Setup
The 7224 ampliers are precision instruments that
can be dangerous if not handled properly. Lethal
voltages are present in both the AC input supply
and the output of these ampliers. For this reason,
safety should be your primary concern when you
setup and operate this amplier.
2.1 Safety First
Throughout this manual special emphasis is
placed on good safety practices. The following
graphics are used to highlight certain topics that
require extra precaution.
Along with any additional accessories purchased
by the customer, all 7224 ampliers ship with the
following:
• 7224 Amplifier
• Toolkit (contains one #2 Phillips screwdriver
and four rubber feet)
• Power Cord
• 7224 Operator’s Manual and Quick Start sheet
2.3 Installation
The 7224 ampliers are packaged in a rugged
powder-coated aluminum chassis. This chassis is
2U (rack units) tall, and has rack “ears” on each
side of the front panel for mounting to a standard
EIA (Electronic Industries Association) rack. Use
standard rack mounting hardware to mount the
amplier. Use nylon washers if you wish to protect
the powder-coat nish on the front of the amplier.
Optionally, the amplier can be placed on a
bench top; please keep in mind that the protective
powder-coating can be scratched when placed
on other equipment or on a bench top, especially
when there is dirt present. To protect the nish, a
set of rubber feet is included in the toolkit that can
be installed on the bottom of the amplier.
Allow ample space on the sides and especially
the back of the amplier for heated air to escape.
The amplier should be mounted in a rack that is
adequately ventilated and not sealed. Likewise,
the front of the amplier should be unobstructed to
allow cool air to enter the amplier.
DANGER represents the most severe
hazard alert. Extreme bodily harm or
death will occur if these guidelines are
not followed. Note the explanation of the
hazard and instruction for avoiding it.
DANGER
WARNING alerts you to hazards that
could result in severe injury or death.
Note the explanation of the hazard and
the instructions for avoiding it.
WARNING
CAUTION indicates hazards that could
result in potential injury or equipment
or property damage. Once again, note
the explanation of the hazard and the
instructions for avoiding it.
CAUTION
Do not operate the amplier in a small
sealed chamber of any kind. Improper
operations and overheating will result.
CAUTION
2.2 Unpacking
All ampliers are tested and inspected for dam-
age before leaving the factory. Carefully unpack
and inspect the amplier for damage. Please note
any damage for future reference and notify the
shipping company immediately if damage is
found. Also, please save the shipping carton and
materials as evidence of damage and/or for return-
ing the amplier for repair.

Information subject to change 97-7224006_3-31-15
7224 OPERATOR’S MANUAL – SECTION 2
8
2.4 Connecting the Load
Before connecting the amplier, make sure the AC
power cord is unplugged.
This section describes output wiring to the load
when using the default amplier conguration:
Single (or Master) amplier operated in Controlled
Voltage mode. The 7224 amplier also can be
eld-adjusted for operation in Controlled Current
mode or for operation as a Slave amplier in a
multi-amplier system. These alternate congu-
rations may require special output wiring and/or
additional components.
If your application requires Controlled Current and/
or Slave operation, change the default settings on
the main board before connecting the amplier.
(See the Advanced Conguration section for
more information.)
Connection to the output of the amplier is to a
3-position terminal strip with #8 screws. Wires
terminated with #8 ring terminals, tinned wires
up to 10GA in size, or bus bars with 0.18 in. (4.6
mm) holes are recommended when connecting to
the output terminals. Connect the load across the
terminals marked “OUTPUT” (positive) and “COM”
(negative/ground). The third terminal, “CHAS-
SIS GROUND” can be connected to an external
ground point such as the rack chassis. See Figure
2.2.
Always use the appropriate wire size and insula-
tion for the maximum current and voltage expected
at the output. Never connect the output of the
amplier to any other model amplier, power sup-
ply, signal source, or other inappropriate load; re
can result.
NOTE: The 7224 amplier comes with a factory-in-
stalled 2.7-ohm, 2W, 5%, metal-oxide resistor con-
necting the terminals marked “COM and “CHAS-
SIS GROUND” (see Figure 2.3). This resistor
should NOT be removed. WARNING: Removing
this resistor can cause dangerous output and/
or damage to the load.
Figure 2.1 – 7224 Back Panel
Figure 2.2 – Connecting the Load
ELECTRIC SHOCK HAZARD.
Output potentials can be lethal. Make
connections only with AC Power OFF
and input signals removed.
WARNING
Figure 2.3 – Closeup of the Output Terminals

97-7224006_3-31-15 Information subject to change 9
7224 OPERATOR’S MANUAL – SECTION 2
2.5 Connecting the Input Signal
The signal is connected to the amplier through
a “SIM (Specialized Input Module) Card” located
on the amplier back panel (see Figure 2.4). The
standard SIM card includes both an Unbalanced
Input BNC jack and a Balanced Input “WECO” ter-
minal block connector, an Input Select switch, and
an Interlock – I/O Connector. See the Applica-
tions section for information on using the Interlock
– I/O Connector.
Position the Input Select switch to the left to
select the Unbalanced Input connector and to the
right to select the Balanced Input connector. Note
that when the Input Select switch is in the right
position, both Unbalanced and Balanced Input
connectors are enabled.
IMPORTANT: The Input Select switch also func-
tions as a Ground Lift switch for the Unbal-
anced Input connector. If circulating currents/
ground loops/60-Hz Hum occur when using
the Unbalanced Input, move the Input Select
switch to the right to lift the ground on the con-
nector.
Figure 2.4 – Closeup of SIM card
Figure 2.5 – Wiring for Unbalanced or Balanced
Input Connector
Connect your input signal to the amplier’s unbal-
anced or balanced input connector as shown in
Figure 2.5. Use cables that are high quality and
shielded to minimize noise and to guard against
possible feedback.

Information subject to change 97-7224006_3-31-15
7224 OPERATOR’S MANUAL – SECTION 2
10
2.6 Connecting the AC Supply
The power cord connects to a standard 20 amp
3-pin IEC-type male connector on the back panel
(see Figure 2.6). Make sure the Breaker/Switch on
the front panel is switched to the OFF (O) position.
Make sure the power cord is inserted and seated
fully into the IEC connector by moving it slightly
back and forth and up and down while pushing
in. The power cord is relatively stiff and should be
routed so that there is no excessive force pulling to
the sides or up or down that would stress the pins
or internal connections. Tighten the cord strain
relief screw to lock the power cord in place.
Review the factory-set supply voltage and ampli-
er conguration detailed on the label placed on
the side of the amplier (see Figure 2.7). This
conguration can be changed by the user. See the
Advanced Conguration section for more infor-
mation.
Figure 2.6 – Closeup of AC Mains Outlet Figure 2.7 – Sample of Congurations Setting Label
2.7 Start-up Procedure
1. Turn down the level of your signal source.
2. Turn down the gain control of the amplier.
3. Depress the POWER switch to turn the
amplier ON.
4. Wait for the yellow READY and green RUN
LEDs to illuminate.
5. Adjust the level of your input signal source
to achieve the desired output level.
6. Turn up the Gain control on the amplier
until the desired voltage or power level is
achieved.
7. Adjust the input signal level to achieve the
desired output level.

97-7224006_3-31-15 Information subject to change 11
7224 OPERATOR’S MANUAL – SECTION 3
3 Amplier Operation
3.1 Front-Panel Controls
This section provides an overview of Front-Panel
controls and indicators found on the 7224.
3.1.1 Power Switch
The Power Switch controls the AC mains power to
the amplier. Switch to the ON position (|) to turn
the amplier on. Switch to the OFF position (O) to
turn the amplier off. See Figure 3.1.
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 amplier OFF (O) and then
turn it back ON (I).
3.1.2 Gain Control
The Gain Control Knob increases/decreases the
gain from 0 – 100% of the overall Gain (factory
default Gain is 20). See Figure 3.2.
3.1.3 Push Buttons
There are three Push Buttons on the 7224.
Enable – For stand-alone ampliers, Enable will
release the amplier from Stop mode and place
the amplier in Run mode (both Ready and Run
LEDs will be lit). When the amplier is placed
in Run mode, the amplier will amplify the input
signal. If an amplier is disabled using a Remote
Standby application, the amplier will be placed in
Standby mode (both Ready and Standby LEDs will
be lit). To return the amplier to Run mode, release
the Standby condition using the remote switch.
See the “Applications” section of this manual for
more information on remote amplier operation.
In multi-amp systems that have been congured to
start up in Standby mode, when the Enable button
is pressed on one amplier, the amplier will be
placed in Standby mode and remain in Standby
mode until all ampliers in the system have been
Enabled. The system will automatically proceed
to Run mode when all ampliers in the system
achieve Standby mode.
Stop – For stand-alone ampliers, Stop will place
the amplier in Stop mode (both Standby and Stop
LEDs will be lit). When the amplier is part of a
multi-amp system, pressing the Stop button on any
amplier in the system will place that amplier in
Stop mode and all other ampliers in the system
in Standby mode. When an amplier is in Stop or
Standby mode, the low-voltage transformer is en-
ergized but the high-voltage transformers are not.
Figure 3.1 – Power Switch
Figure 3.2 – Gain Control Figure 3.3 – Push Buttons

Information subject to change 97-7224006_3-31-15
7224 OPERATOR’S MANUAL – SECTION 3
12
Reset – For stand-alone ampliers, when a fault
condition occurs, the amplier may be placed in
Standby mode (Standby LED will be lit), depending
on the amplier conguration and the fault condi-
tion. To release the amplier from Standby mode,
clear the fault condition and then press the Reset
button. If the amplier is in Run mode when the
fault condition occurs, pressing the Reset button
will return the amplier to Run mode. If the ampli-
er is in Stop mode when the fault condition occurs,
pressing the Reset buttonwill return the amplier to
Stop mode.
When the amplier is part of a multi-amp system,
pressing the Reset button on the amplier report-
ing the fault condition will clear the condition and
return all ampliers to Run or Stop mode; pressing
the Reset button on other ampliers in the system
will NOT clear the fault condition.
Figure 3.4 – Indicators
3.2 Front-Panel Indicators
3.2.1 Main Status Indicators
Four Main Status indicators are located on the
amplier’s front-panel. These LEDs monitor the
internal conditions of the amplier and indicate the
current state of operation. The chart below details
the operational modes indicated by the Main Sta-
tus indicators.
Figure 3.5 – Main Status Indicators for Stand-Alone Ampliers
Indicator is lit Indicator is not lit Indicator may be lit
Main Status
Indicators State of Operation Action Needed to Return to Run Mode
Run
Ready
Standby
Stop
Run mode: The amplier’s high-voltage trans-
formers are energized and the unit will amplify
the input signal. Run mode is initiated by: (1) the
Enable push button, or (2) when the amplier
powers up in Run mode (factory default). See
the “Advanced Conguration” section for more
information.
N/A
Run
Ready
Standby
Stop
Standby mode: Standby mode indicates that
the amplier is functioning properly and all Fault
Status modes are clear, but it is being held in
Standby by an external condition. As congured
from the factory (Run mode on startup), the ampli-
er will enter Standby mode briey after power-
ing up, and then will move automatically into Run
mode. In Standby mode, the amplier’s low-voltage
transformer is energized but the high-voltage trans-
formers are not.
If the amplier remains in Standby mode, it is
being held in Standby by remote control through
the SIM Interlock I/O connector. Open the En-
able/Standby switch to clear this remote Standby
condition and return the amplier to Run mode.
See the “Applications” section of this manual
for more information on remote amplier opera-
tion.
Run
Ready
Standby
Stop
Stop mode: When the Stop button on the ampli-
er front panel is pressed, the amplier will enter
Stop mode. The amplier may also enter Stop
mode after powering up if the amplier is cong-
ured to enter Stop mode on startup. In Stop mode,
the amplier’s low-voltage transformer is energized
but the high-voltage transformers are not.
To release the amplier from Stop mode, press
the Enable button.

97-7224006_3-31-15 Information subject to change 13
7224 OPERATOR’S MANUAL – SECTION 3
3.2.2 Fault Status Indicators
Four Fault Status indicators are located on the
amplier front panel. These LEDs monitor the in-
ternal conditions of the amplier and will illuminate
when a fault condition occurs. Depending on the
fault condition and the conguration of the unit, the
amplier may be placed in Standby mode when a
fault condition occurs. Refer to the following chart
to determine the fault condition being indicated
and the action required to clear the fault condition.
Figure 3.6 – Fault Status Indicators for Stand-Alone Ampliers
Indicator is lit Indicator is not lit Indicator may be lit
Main Status
Indicators
Fault Status
Indicators State of Operation
Action Needed to Clear Fault
Condition and Return to
Run Mode
Run
Ready
Standby
Stop
Fault
Over Load
Over Temp
Over Voltage
Output Fault status: This indicates
that an Output Fault condition has oc-
curred and the amplier has been placed
in Standby mode. The Fault indicator
will light under two conditions: 1) High-
frequency oscillation is causing high
shoot-through current; or 2) An output
transistor has shorted, causing the output
fault condition.
This fault condition cannot be cleared
using the front-panel Reset button. See
the “Trouble-
shooting” section for more informa-
tion on diagnosing and clearing this fault
condition.
Run
Ready
Standby
Stop
Fault
Over Load
Over Temp
Over Voltage
Over Load status: This indicates that
the output of the amplier could not follow
the input signal due to voltage or current
limits. Under normal operation with the
factory-default settings, an Over Load
condition will not place the amplier in
Standby mode. If the amplier has been
congured to be forced to Standby on
Over Load, the amplier will be placed in
Standby mode when the Over Load indica-
tor lights.
To remedy the Over Load fault during
operation, turn down the level of the input
signal until the Over Load indicator turns
off. To clear an Over Load fault condition
when the amplier is forced to Standby,
turn down the level of the input signal,
then push the Reset button.
Run
Ready
Standby
Stop
Fault
Over Load
Over Temp
Over Voltage
Over Temp status: The amplier
monitors the temperature inside the high-
voltage transformers, low-voltage trans-
former and in the output stage heat sinks.
The Over Temp indicator will light and the
amplier will be placed in Standby mode
when the temperature sensors detect a
condition that would damage the ampli-
er. If the Over Temp pulse is extremely
short, as in the case of defective wiring or
switches, the Over Temp LED may be lit
too briey to observe.
To reset after an Over Temp fault has
occurred, make sure the fans are running,
and then remove the input signal from the
amplier. Allow the fans to run for about
5 minutes until the amplier automati-
cally returns to Run mode. If the amplier
has been congured for Standby mode
on Over Temp, then the amplier will not
automatically return to Run mode. In that
case, push the Reset button to return the
amplier to Run mode. See the “Trouble-
shooting” section for information on cor-
recting the cause of an Over Temp fault
condition.
Run
Ready
Standby
Stop
Fault
Over Load
Over Temp
Over Voltage
Over Voltage status: This indicates
that the AC mains voltage is more than
+10% of nominal. The amplier will be
forced to Standby when an Over Voltage
condition occurs. When the Over Voltage
condition is cleared, the amplier will auto-
matically return to Run mode.
To clear an Over Voltage fault condition,
the AC mains must be brought down to
the nominal value. If the amplier does
not return to Run mode when the Over
Voltage condition has cleared, the ampli-
er may require servicing. Please see
the “Troubleshooting” section for more
information.

Information subject to change 97-7224006_3-31-15
7224 OPERATOR’S MANUAL – SECTION 3
14
3.2.3 Main Status Indicators for
Multi-amplier Systems
The Main Status indicators on each amplier in
a multi-amp system are used to determine the
operational status of the amplier. When evaluated
along with the statuses of other ampliers in the
system, the Main Status indicators can be used to
determine the system status and the action re-
quired to return the system to Run mode.
Figure 3.7 – Main Status Indicators for Multi-Amplier Systems
Indicator is lit Indicator is not lit Indicator may be lit
Main Status
of One or
More Amps in
the System
Main Status of
Other Amps in
the System State of Operation
Action Needed to Return to
Run Mode
Run
Ready
Standby
Stop
Run
Ready
Standby
Stop
Run mode: All of the ampliers in the
system are in Run mode. The ampliers’
high-voltage transformers are energized
and the system will amplify the input
signal.
N/A
Run
Ready
Standby
Stop
Run
Ready
Standby
Stop
Remote Standby Condition: All of
the ampliers in the system are being
held in Standby mode by an external
condition. In Standby mode, the ampli-
ers’ low-voltage transformers are ener-
gized but the high-voltage transformers
are not.
If the ampliers remain in Standby
mode, the system is being held in
Standby by remote control through the
SIM Interlock I/O connector. Open the
Enable/Standby switch to clear this
remote Standby condition and return
the system to Run mode. See the
“Applications” section of this manual
for more information on remote ampli-
er operation.
Run
Ready
Standby
Stop
Run
Ready
Standby
Stop
System Not Ready: If one or more
of the ampliers has no LEDs lit, the
amplier has no power or has not been
turned on, and the other ampliers in the
system will be held in Standby mode.
In Standby mode, the amplier’s low-
voltage transformer is energized but the
high-voltage transformers are not.
Make sure all ampliers have AC
power and have been turned on. When
all ampliers attain Standby status, all
ampliers in the system will simultane-
ously be placed in Run mode.
Run
Ready
Standby
Stop
Run
Ready
Standby
Stop
Stop mode: When the Stop button on
any amplier in the system is pressed,
that amplier will enter Stop mode and
all other ampliers will enter Standby
mode. The system may also enter Stop
mode after powering up if one or more
ampliers in the system is congured
to enter Stop mode on startup. In Stop
mode, the amplier’s low-voltage trans-
former is energized but the high-voltage
transformers are not.
To release the system from Stop mode,
press the Enable button on the ampli-
er displaying the Stop mode status.

97-7224006_3-31-15 Information subject to change 15
7224 OPERATOR’S MANUAL – SECTION 3
3.2.4 Fault Status Indicators for
Multi-Amp Systems
The four Fault Status indicators located on each
amplier’s front panel are used to monitor the
internal conditions of the amplier and will illumi-
nate when a fault condition occurs. All ampliers
in the system may be placed in Standby mode
when a fault condition occurs, depending on the
fault condition and the conguration of the sys-
tem. Typically, the system can be released from
Standby mode by pressing the Reset button on the
amplier displaying the Fault status. Refer to the
chart below to determine the fault condition being
indicated and the action required to clear the fault
condition and return the system to Run mode.
Figure 3.8 – Fault Status Indicators for Multi-Amplier Systems
Indicator is lit Indicator is not lit Indicator may be lit
One or More Amps in System Other Amps in System
State of Operation
Action Needed to
Clear Fault
Condition and Re-
turn to Run Mode
Main Status
Indicators
Fault Status
Indicators
Main Status
Indicators
Fault Status
Indicators
Run
Ready
Standby
Stop
Fault
Over Load
Over Temp
Over Voltage
Run
Ready
Standby
Stop
Fault
Over Load
Over Temp
Over Voltage
Output Fault status:
This indicates that an
Output Fault condition has
occurred in the amplier
displaying the Fault sta-
tus, and the system has
been placed in Standby
mode. The Fault indicator
will light under two condi-
tions: 1) High-frequency
oscillation is causing high
shoot-through current;
or 2) An output transistor
has shorted, causing the
output fault condition.
This fault condition can-
not be cleared using the
front-panel Reset button.
See the “Trouble-
shooting” section for
more information on
diagnosing and clearing
this fault condition.
Run
Ready
Standby
Stop
Fault
Over Load
Over Temp
Over Voltage
Run
Ready
Standby
Stop
Fault
Over Load
Over Temp
Over Voltage
Over Load status:
This indicates that the
output of the system
could not follow the input
signal due to voltage
or current limits. Under
normal operation with the
factory-default settings, an
Over Load condition will
not place the system in
Standby mode. If the sys-
tem has been congured
to be forced to Standby
on Over Load, the system
will be placed in Standby
mode when the Over
Load indicator lights.
To remedy the Over
Load fault during opera-
tion, turn down the level
of the input signal until
the Over Load indica-
tor turns off. To clear an
Over Load fault condi-
tion when the amplier is
forced to Standby, turn
down the level of the
input signal, then push
the Reset button on the
amplier(s) displaying
the Over Load status.

Information subject to change 97-7224006_3-31-15
7224 OPERATOR’S MANUAL – SECTION 3
16
One or More Amps in System Other Amps in System
State of Operation
Action Needed to
Clear Fault
Condition and Re-
turn to Run Mode
Main Status
Indicators
Fault Status
Indicators
Main Status
Indicators
Fault Status
Indicators
Run
Ready
Standby
Stop
Fault
Over Load
Over Temp
Over Voltage
Run
Ready
Standby
Stop
Fault
Over Load
Over Temp
Over Voltage
Over Temp status:
Each amplier in the
system monitors the
temperature inside the
high-voltage transformers,
low-voltage transformer
and in the output stage
heat sinks. The Over
Temp indicator will light
and the system will be
placed in Standby mode
when the temperature
sensors detect a condi-
tion that would damage
the amplier system. If
the Over Temp pulse is
extremely short, as in the
case of defective wiring or
switches, the Over Temp
LED may be lit too briey
to observe.
To reset after an Over
Temp fault has occurred,
make sure the ampli-
er fans in all ampliers
are running, and then
remove the input signal
from the system. Allow
the fans to run for about
5 minutes until the
system automatically
returns to Run mode.
If the system has been
congured for Standby
mode on Over Temp,
then the system will not
automatically return to
Run mode. In that case,
push and hold the Reset
button on any ampli-
er displaying the Over
Temp status until the
Standby LED turns off,
then release the Reset
button to return the
system to Run mode.
Please see the “Trou-
bleshooting” section for
information on correcting
the cause of an Over
Temp fault condition.
Run
Ready
Standby
Stop
Fault
Over Load
Over Temp
Over Voltage
Run
Ready
Standby
Stop
Fault
Over Load
Over Temp
Over Voltage
Over Voltage status:
This indicates that the
AC mains voltage is more
than +10% of nominal. All
ampliers in the system
will be forced to Standby
when an Over Voltage
condition occurs. When
the Over Voltage condi-
tion is cleared, the system
will automatically return to
Run mode.
To clear an Over Voltage
fault condition, the AC
mains must be brought
down to the nominal
value. If the system does
not return to Run mode
when the Over Voltage
condition has cleared,
one or more ampliers
may require servicing.
Please see the “Trou-
bleshooting” section for
more information.

97-7224006_3-31-15 Information subject to change 17
7224 OPERATOR’S MANUAL – SECTION 3
3.3 Back-Panel Controls
and Connectors
This section provides an overview of Back-Panel
controls and connectors found on the 7224. Please
refer to Figure 3.5 for visual locations.
AC Supply – Standard 20 amp 3-pin IEC-type
male connector.
Output Terminal Strip – Connect output lines
from the load to this 3-position terminal strip with
#8 screws. It accepts up to #10 AWG wire.
Unbalanced BNC Input Connector – This input
option provides a standard unbalanced input.
Input Selector Switch – When in the LEFT
position, the unbalanced BNC input connector is
enabled. When in the RIGHT position, both unbal-
anced BNC and balanced Phoenix® input con-
nectors are enabled. The Input Select switch also
functions as a Ground Lift switch for the Unbal-
anced BNC input connector. If circulating currents/
ground loops/60-Hz Hum occur when using the
unbalanced input, move the Input Select switch to
the right to lift the ground on the connector.
Balanced Phoenix® Input Connector – This
input option provides a balanced input.
Interlock Connector – This 25-pin, D-sub connec-
tor is used for interlocking and combining functions
in a system of multiple ampliers. It can also be
used for remote control and monitoring applica-
tions (see the “Applications” section for more
information).
Figure 3.9 – Back Panel Controls and Connectors

Information subject to change 97-7224006_3-31-15
7224 OPERATOR’S MANUAL – SECTION 4
18
4 Advanced Conguration
The 7224 amplier was designed to offer excep-
tional versatility in operation. You can choose from
a range of eld-congurable options, including:
• Operate as a stand-alone amplifier or as part of
a multiple-amplifier system.
• Operate with variable gain control or at a fixed
gain setting of 20.
• Select Controlled-Current or Controlled-Voltage
modes of operation.
• Trigger Standby mode when specified fault
conditions occur during operation.
• Select the Stop mode state at power-up, or go
immediately to the Run mode state at power-up.
• Configure for use in high voltage applications,
high current applications, or for applications
requiring mid-level amounts of both voltage
and current.
Your 7224 amplier has been pre-congured to
your specications before shipping from the fac-
tory. These initial settings are detailed on your
7224 Proof of Performance sheet and on a label
located on the side of the amplier.
If you need to make changes to your amplier’s
conguration, please follow the instructions con-
tained in this chapter.
4.1 Conguration Access Panel
The 7224 amplier contains an Access Panel built
into the top cover. Most conguration settings
can be made through this Access Panel. For your
convenience, a #2 Phillips screwdriver is provided
in your Toolkit for use in this procedure.
IMPORTANT: Before removing the Access
Panel, make sure the amplier is turned off
for at least 3-5 minutes and the AC mains are
disconnected.
1. Locate the Access Panel as shown in Figure
4.1. Make sure that all 8 screws are acces-
sible. Remove the unit from its rack, if neces-
sary.
2. Using a #2 Phillips screwdriver (provided), re-
move the 8 screws located on the top and side
of the amplier.
3. Remove the Access Panel and set it aside.
Do not attempt to access the Main Board
or Power Supply Board while the ampli-
er is running. Turn the amplier off and
disconnect the AC Mains before opening
the Access Panel.
WARNING
After turning the amplier off, let the unit
sit for 2 minutes before removing the Ac-
cess Panel. This will allow the electrical
charge in the Power Supply capacitors
to discharge.
CAUTION
4.2 Conguration Settings Located on
the Main Board
The following custom settings can be made via
jumper settings on the Main Board, which is
located inside the Access Panel compartment, as
shown in Figure 4.2.
• Master/Slave setting for stand-alone or multi-
ple-amplifier systems.
• Variable or Fixed Gain setting.
• Controlled Current/Controlled Voltage setting.
Figure 4.1 – Access Panel Screw Locations

97-7224006_3-31-15 Information subject to change 19
7224 OPERATOR’S MANUAL – SECTION 4
• Compensation setting to select RC network
when operating in Controlled Current mode.
• Stop Mode/Run Mode setting for selection of
power-up state.
• Standby mode on Over Temp setting to trigger
Standby mode when amplifier senses an Over-
Temperature state.
• Standby mode on Over Load setting to trigger
Standby mode when amplifier senses an Over
Load state.
Figure 4.2 – Main Board Location Inside
Access Panel
Figure 4.3 – Master/Slave Setting
Figure 4.4 – Gain Trim Control
4.2.2 Fixed Gain/Variable Gain Setting
The 7224 amplier ships with an enabled Gain
Control knob (located on the amplier front panel).
To disable the Variable Gain control and set for a
Fixed Gain of 20, locate and unplug the red con-
nector from jumper J10. Then place a jumper on
the left two pins at that location. See Figure 4.4.
4.2.1 Master/Slave Setting
To enable the 7224 amplier for use as a single
amplier or as the Master amplier in a multi-ampli-
er system, set jumpers P1 and P2 in the Master
position (jumpers across top two pins of each set).
To enable the 7224 amplier for use as a Slave
amplier in a multi-amplier system, set jumpers
P1 and P2 in the Slave position (jumpers across
bottom two pins of each set). See Figure 4.3.

Information subject to change 97-7224006_3-31-15
7224 OPERATOR’S MANUAL – SECTION 4
20
4.2.3 Controlled-Voltage/
Controlled-Current Mode Setting
To allow the 7224 amplier’s output voltage to be
controlled by its input voltage signal, place jumper
J4 in the Right position. To allow the 7224 ampli-
er’s output current to be controlled by its input
voltage signal, place jumper J4 in the Left posi-
tion. See Figure 4.5. For more information on
Controlled-Current operation, see the “Applica-
tions” section of this manual.
Figure 4.5 – Controlled-Voltage/
Controlled-Current Mode Setting
Figure 4.6 – Compensation Setting
Figure 4.7 – Run Mode/Stop Mode
on Power-Up Setting
4.2.4 Compensation Setting
(Controlled-Current Mode)
When the 7224 amplier is used in Controlled-
Current mode, the current control loop is tuned
with one of two available RC networks. Place
jumper J5 in the Up position to select CC1 net-
work. Place jumper J5 in the Down position to
select CC2 network. See Figure 4.6. For more
information on Controlled-Current operation, see
the “Applications” section of this manual.
4.2.5 Run Mode/Stop Mode on
Power-Up Setting
The 7224 amplier will power-up to Run Mode
when jumper J11 is in the Left position (default
setting). To cause the 7224 amplier to enter Stop
Mode on power-up, place jumper J11 in the Right
position. See Figure 4.7.
In Controlled-Current Mode, the load is part of the
amplier circuit, and the relationship of the load to the
amplier is critical. For proper and safe operation in
Controlled-Current mode, you must obverve the follow-
ing guidelines:
1. Properly attach a load before operating the
amplier.
2. DO NOT use a blocking capacitor. The load must
have a DC path.
3. Never leave the load open. If you feel the load must
be fused, which could lead to a potential open circuit,
please contact AE Techron Application Engineering
department.
CAUTION
4. Check to make sure the load has some inductive
component.
5. Provide appropriate Compenation for the load.
6. If oscillation occurs, turn of the amplier immediately.
Failure to follow these guidelines may result
in damage to the amplier or load.