Aetechron 7224 User manual

7224 & 7226
Operator’s Manual
Single-Channel Industrial Ampliers 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 prod-
uct 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 actions 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
product 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 dis-
claim all implied warranties, including, without limita-
tion, any warranties of merchantability or fitness 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 specifications 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 unauthorized modifications, 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
defective 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
including interest, insurance, closing costs, and other
finance 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., includ-
ing one-way surface freight shipping costs within the
United States. (Purchaser 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 ship-
ments.)

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]
This Declaration of Conformity is issued under the sole responsibility
of AETechron,Inc.,and belongs to thefollowing product:
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 2004/108/EC (until 19th April, 2016) and Directive
2014/30/EU (from 20th April, 2016), and the Low Voltage Directive 2006/95/EC (until 19th April, 2016) and Directive 2014/35/EU (from 20th April, 2016).
Signed:
Larry Shank Place of Issue: Elkhart, IN, USA
President Date of Issue: March 18, 2016
CE Affixing Date: March 4, 2011

Contents
1 Introduction....................................................................................................................................6
1.1 Features................................................................................................................................6
2 Amplier Unpacking and Installation..............................................................................................7
2.1 Safety First............................................................................................................................7
2.2 Unpacking .............................................................................................................................7
2.3 Installation.............................................................................................................................7
3 Connections and Startup ...............................................................................................................8
3.1 Other Operation Modes and Congurations..........................................................................8
3.2 Connecting the Load .............................................................................................................8
3.3 Connecting the Input Signal ..................................................................................................9
3.4 Connecting the AC Supply ..................................................................................................10
3.5 Start-up Procedure..............................................................................................................11
4 Amplier Operation ......................................................................................................................12
4.1 Front-Panel Controls...........................................................................................................12
4.2 Back-Panel Controls and Connectors.................................................................................15
5 Advanced Conguration...............................................................................................................16
5.1 Conguration Access Panel ................................................................................................16
5.2 Conguration Settings Located on the Main Board.............................................................16
5.3 Conguration Settings Located on the Power Supply Board ..............................................19
6 Applications..................................................................................................................................22
6.1 Remote Status and Control using the SIM Interlock I/O Connector....................................22
6.2 Controlled Current Operation..............................................................................................26
6.3 Multi-amplier Systems .......................................................................................................30
7 Amplier Signal Flow....................................................................................................................38
7.1 Input Signals........................................................................................................................38
7.2 AC Mains Power..................................................................................................................38
8 Maintenance ................................................................................................................................39
8.1 Clean Amplier Filter and Grills ...........................................................................................39
9 Troubleshooting ...........................................................................................................................40
9.1 Introduction & Precautions..................................................................................................40
9.2 Visual Inspection.................................................................................................................40
9.3 No Signal.............................................................................................................................41
9.4 No LEDs Illuminated or No Fans.........................................................................................41
9.5 OverVoltage LED Lit............................................................................................................41
9.6 Standby LED Remains Illuminated......................................................................................41
9.7 Amplier Overheats (Over Temp Fault Condition)...............................................................42
9.8 Fault LED is Illuminated ......................................................................................................42
9.9 Factory Service ...................................................................................................................42
10 Specications.............................................................................................................................44

List of Figures
Figure 1.1 – 7224 & 7226 Front Panels...............................................................................................6
Figure 3.1 – 7224/7226 Back Panel ....................................................................................................8
Figure 3.2 – Closeup of the Output Terminal Resistor.........................................................................9
Figure 3.3 – Connecting the Load .......................................................................................................9
Figure 3.4 – Closeup of SIM card........................................................................................................9
Figure 3.5 – Wiring for Unbalanced or Balanced Input Connector....................................................10
Figure 3.6 – Closeup of AC Mains Outlet ..........................................................................................10
Figure 3.7 – Sample of Congurations Setting Label........................................................................10
Figure 4.1 – Power Switch.................................................................................................................12
Figure 4.2 – Gain Control ..................................................................................................................12
Figure 4.3 – Push Buttons.................................................................................................................13
Figure 4.4 – Indicators.......................................................................................................................13
Figure 4.5 – Main Status Indicators...................................................................................................13
Figure 4.6 – Fault Status Indicators...................................................................................................14
Figure 4.7 – Back Panel Controls and Connectors ...........................................................................15
Figure 5.1 – Access Panel Screw Locations .....................................................................................16
Figure 5.2 – Main Board Location Inside Access Panel ....................................................................17
Figure 5.3 – Master/Slave Setting .....................................................................................................17
Figure 5.4 – Gain Trim Control ..........................................................................................................17
Figure 5.5 – Controlled-Voltage/Controlled-Current Mode Setting ....................................................18
Figure 5.6 – Compensation Setting...................................................................................................18
Figure 5.7 – Run Mode/Stop Mode on Power-Up Setting .................................................................19
Figure 5.8 – Standby Mode on Over Load Setting ............................................................................19
Figure 5.9 – Accessing the Power Supply Board ..............................................................................20
Figure 5.10 – Location of Amplier High-Voltage Transformer Sockets ............................................20
Figure 5.11 – J3 and J7 Plug Locations for High-Current Output......................................................20
Figure 5.12 – J4 and J8 Plug Locations for High-Voltage Output .....................................................20
Figure 5.13 – Bi-Level Power Switch Location..................................................................................20
Figure 6.1 – Remote Status and Control Pinouts..............................................................................22
Figure 6.2 – Remote Run/Standby Monitor.......................................................................................22
Figure 6.3 – Remote Status and Reset Schematic ...........................................................................23
Figure 6.4 – Remote Enable/Standby ...............................................................................................24
Figure 6.5 – Remote Current Monitoring...........................................................................................25
Figure 6.6 – Remote Current Monitoring, Alternate Method..............................................................25
Figure 6.7 – Input to Output Comparison, Controlled-Voltage Operation..........................................26
Figure 6.8 – Input to Output Comparison, Controlled-Current Operation..........................................26
Figure 6.9 – Factory-installed Default RC Network ...........................................................................27
Figure 6.10 – Custom Compensation Location .................................................................................29
Figure 6.11 – Compensation Effects on Waveform ...........................................................................29
Figure 6.12 – Square Wave Showing a Decrease in R is Required..................................................29
Figure 6.13 – Square Wave Showing an Increase in R is Required .................................................29
Figure 6.14 – Square Wave Showing a Decrease in C is Required..................................................29
Figure 6.15 – Main Status Indicators for Multi-Amplier Systems.....................................................32
Figure 6.16 – Fault Status Indicators for Multi-Amplier Systems.....................................................33
Figure 7.1 – Board-Level Functional Block Diagram.........................................................................38
Figure 9.1 – +Vcc and –Vcc Point Locations.....................................................................................40
Figure 9.2 – Fuse F1 Location...........................................................................................................41
Figure 9.3 – Interlock I/O Connector .................................................................................................41
Figure 10.1 – 7224 Voltage Potential vs. Frequency.........................................................................46
Figure 10.2 – 7226 Voltage Potential vs. Frequency.........................................................................46
Figure 10.3 – 7224 & 7226 Frequency Response.............................................................................46
Figure 10.4 – 7224 Noise vs. Frequency...........................................................................................46
Figure 10.5 – 7224 Continuous Power vs. Frequency ......................................................................46
Figure 10.6 – 7224 Thermal Performance.........................................................................................46
Figure 10.7 – 7224 DC Current Over Timeat 13.5 VDC ....................................................................47
Figure 10.8 – 7224 DC Current Over TimeComparison with 4-ohm Load.........................................47
Figure 10.9 – 7224 DO 160 Section 18.2 AC Power Processing ......................................................47

Information subject to change 97-8004167 07-14-17
7224 & 7226 OPERATOR’S MANUAL – SECTION 1
6
1 Introduction
Congratulations on your purchase of the 7224 or
7226 AE Techron power amplier—one of the most
precise power ampliers ever produced for indus-
trial applications and testing. The 7224 and 7226
ampliers are built and tested to the most stringent
quality standards for long life and outstanding
performance. TheAE 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 7224/7226 is a single-channel linear amplier
designed for use in demanding applications requir-
ing low noise, low distortion, and accurate power
amplication from DC to 300 kHz. They feature:
• Small-signal bandwidth of DC to 300 kHz.
• Continuous output of over 900 watts RMS at 4
ohms.
• 40 mSec pulses of up to 52 amperes peak into
a 0.5 ohm load.
• System output of over 3,600 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 amplifier from
input overloads, improper output connection
(including shorted and improper loads), over-
temperature, over-current, and supply voltages
that are too high or low.
• Shipped ready to operate from 120-volt (±10%)
single-phase AC mains; 220/240-volt model
available on request.
Figure 1.1 – 7224 & 7226 Front Panels

97-8004167 07-14-17 Information subject to change 7
7224 & 7226 OPERATOR’S MANUAL – SECTION 2
2 Amplier Unpacking and
Installation
The 7224/7226 ampliers are precision instru-
ments that can be dangerous if not handled prop-
erly. 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 7224/7226 ampliers ship with
the following:
• 7224 or 7226 Amplifier
• Toolkit (contains one #2 Phillips screwdriver
and four rubber feet)
• Power Cord
• Operator’s Manual and Quick Start sheet
2.3 Installation
The 7224/7226 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 97-8004167 07-14-17
7224 & 7226 OPERATOR’S MANUAL – SECTION 3
8
3 Connections and Startup
This section details the wiring and startup proce-
dures for a single 7224 or7226 amplier operat-
ing in Controlled-Voltage mode (factory default).
Before connecting the amplier, make sure the AC
power cord is unplugged.
3.1 Other Operation Modes and
Congurations
The 7224/7226 amplier can be eld-congured
for operation in a number of ways. The ampli-
er can be operated in Controlled-Voltage or
Controlled-Current mode. It also can be congured
for operation as a part of a multi-amplier system.
These alternate congurations may require special
output wiring and/or additional components.
3.1.1 Controlled-Current Operation of a
Stand-Alone Amplier
If your application requires Controlled Current
operation, the amplier rst should be wired and
tested in Controlled-Voltage mode to verify that the
amplier and input signal are operating correctly.
Once proper operation is conrmed, refer to the
“Applications” section of this manual for instruc-
tions on conguring and operating your amplier in
Controlled-Current mode.
3.1.2 Multi-Amp Operation
If your application requires multi-amp operation for
increased voltage or current, each amplier should
rst be wired and tested individually in Controlled-
Voltage mode to ensure proper operation.
To congure two or more ampliers for Series or
Parallel operation in Controlled-Voltage mode,
refer to the Multi-Amp Conguration Guide
(available for download from aetechron.com).
For Series or Parallel operation in Controlled-
Voltage mode, refer to the “Applications” section
of this manual.
For Series operation in Controlled-Current
mode, you should select one amplier to be oper-
ated as the “Master” amplier of the system, and
then refer to the “Applications” section of this
manual for instructions on conguring this ampli-
er for operation in Controlled-Current mode. After
the Master amplier is congured and tested for
Controlled-Current operation, refer to the Multi-
Amp Conguration Guide (available for down-
load from aetechron.com) for information on Series
system conguration.
For Parallel operation in Controlled-Current
mode, please contact AE Techron Technical
Support for assistance.
3.2 Connecting the Load
3.2.1 Preparation and Cautions
Before connecting the amplier, make sure the
AC power is disconnected.
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
Figure 3.1 – 7224/7226 Back Panel
ELECTRIC SHOCK HAZARD.
Output potentials can be lethal. Make
connections only with AC Power OFF
and input signals removed.
WARNING

97-8004167 07-14-17 Information subject to change 9
7224 & 7226 OPERATOR’S MANUAL – SECTION 3
Figure 3.3 – Connecting the Load
amplier to any other model amplier, power sup-
ply, signal source, or other inappropriate load; re
can result.
NOTE: The 7224/7226 amplier comes with a
factory-installed 2.7-ohm, 2W, 5%, metal-oxide
resistor connecting the terminals marked “COM
and “CHASSIS GROUND” (see Figure 3.2). This
resistor should NOT be removed except when the
amplier is being used as a Slave amplier in a
Series multi-amp system. WARNING: Removing
this resistor can cause dangerous output and/
or damage to the load.
3.2.2 Connecting the Outputs
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, “CHASSIS GROUND”
Figure 3.2 – Closeup of the Output Terminal Resistor
Figure 3.4 – Closeup of SIM card
can be connected to an external ground point such
as the rack chassis. See Figure 3.3.
3.3 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 3.4). The SIM
card offers the choice of BNC or “WECO” terminal
block input connectors.
The Input Select switch, located on the SIM mod-
ule between the input connectors, allows conve-
nient selection of balanced or unbalanced input
wiring and also can function as a ground-lift switch
for the BNC input connector. The Input Select
switch functions by connecting/ disconnecting the
inverting (–) pin on each input connector to the
amplier ground through a 4.7-ohm resistor (see
Figure 3.5). When the Input Select switch is in the
LEFT position, the shield on the BNC connector

Information subject to change 97-8004167 07-14-17
7224 & 7226 OPERATOR’S MANUAL – SECTION 3
10
and the inverting (–) pin on the terminal block con-
nector are tied to the amplier ground, allowing the
connectors to be used for Unbalanced input wiring.
When the Input Select switch is in the RIGHT
position, the inverting (–) pin on the terminal block
connector is oating, allowing the connector to be
used for Balanced input wiring.
IMPORTANT: The Input Select switch can also
function as a Ground Lift switch for the BNC
Input connector. If circulating currents/ground
loops/60-Hz Hum occur when using the BNC
Input, move the Input Select switch to the right
to lift the ground on the connector.
We recommend that you use cables that are high
quality and shielded to minimize noise and to
guard against possible feedback.
Note: See the “Applications” section for informa-
tion on using the Interlock – I/O Connector located
on the SIM card.
3.4 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 3.6). 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 3.7). This
conguration can be changed by the user. See the
Advanced Conguration section for more infor-
mation.
Figure 3.6 – Closeup of AC Mains Outlet
Figure 3.7 – Sample of Congurations Setting Label
Figure 3.5 – Wiring for Unbalanced or Balanced
Input Connector

97-8004167 07-14-17 Information subject to change 11
7224 & 7226 OPERATOR’S MANUAL – SECTION 3
3.5 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.

Information subject to change 97-8004167 07-14-17
7224 & 7226 OPERATOR’S MANUAL – SECTION 4
12
4 Amplier Operation
4.1 Front-Panel Controls
This section provides an overview of Front-Panel
controls and indicators found on the 7224/7226
amplier.
4.1.1 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 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 amplier 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 ampliy the input signal).
By default, the amplier will automatically enter
the Run condition on power-up. To change the
factory-default setting and congure the amplier
to power-up in Standby/Stop mode, please see the
Advanced Conguration section.
The amplier will enter one of three Standby
modes under the following conditions:
Remote Standby mode (Ready and Standby
LEDs lit): The amplier is functioning properly and
all Fault Status modes are clear, but the unit has
been placed in Standby by an external condition.
If an amplier is disabled using a Remote Standby
application, the amplier will be placed in Remote
Standby mode. To return the amplier 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-
er operation.
Standby/Fault mode (Standby and one or more
Fault LEDs lit): The amplier 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 amplier has been
placed in Standby due to a Stop order: The Stop
button on the amplier front panel has been
pushed or the amplier has been congured to
enter Stop mode on startup. See the “Advanced
Conguration” section for information about con-
guring the amplier for Startup in Stop mode.
Figure 4.1 – Power Switch
Figure 4.2 – Gain Control

97-8004167 07-14-17 Information subject to change 13
7224 & 7226 OPERATOR’S MANUAL – SECTION 4
Figure 4.3 – Push Buttons
Enable, Stop and Reset Buttons
The following details the results when each of the
three Push Buttons are pressed on the amplier
front panel. See Figure 4.3 for Push Button loca-
tions.
Enable – When the amplier is in Standby/Stop
mode, pressing the Enable button will release the
amplier from Standby and place the amplier in
Run mode. Pressing the Enable button will also re-
lease the amplier from some Standby conditions.
Stop – Pressing the Stop button will place the
amplier in Standby/Stop mode (both Standby and
Stop LEDs will be lit).
Reset – When the amplier has been placed
in Standby/Fault mode due to a fault condition,
pressing the Reset button will return the amplier
to Run mode if the condition causing the fault con-
dition has been cleared and the amplier has been
congured for startup in Run mode. If the ampli-
Figure 4.4 – Indicators
er has been congured for startup in Stop mode,
pressing the Reset button will place the amplier
in Standby/Stop mode. Press the Enable button to
return the amplier to Run mode.
Figure 4.5 – Main Status Indicators
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
Remote Standby mode: Standby mode indi-
cates 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 Remote Standby mode briey after
powering up, and then will move automatically into
Run mode. In Remote Standby mode, the ampli-
er’s low-voltage transformer is energized but the
high-voltage transformers are not.
If the amplier remains in Remote Standby
mode, it is being held in Standby by remote
control through the SIM Interlock I/O connec-
tor. Open the Enable/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 operation.
Run
Ready
Standby
Stop
Standby/Stop mode: When the Stop button on
the amplier front panel is pressed, the amplier
will enter Standby/Stop mode. The amplier may
also enter Standby/Stop mode after powering up
if the amplier is congured to enter Stop mode
on startup. In StandbyStop mode, the amplier’s
low-voltage transformer is energized but the high-
voltage transformers are not.
To release the amplier from Standby/Stop
mode, press the Enable button.

Information subject to change 97-8004167 07-14-17
7224 & 7226 OPERATOR’S MANUAL – SECTION 4
14
Front-Panel Indicators
4.1.4 Main Status Indicators
Four Main Status indicators are located on the am-
plier’s front-panel (see Figure 4.4). These LEDs
monitor the internal conditions of the amplier and
indicate the current state of operation. The chart in
Figure 4.5 details the operational modes indicated
by the Main Status indicators.
NOTE: See the “Applications” section for main
status indicator interpretation when operating a
multi-amp system.
Figure 4.6 – Fault Status Indicators
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 “Troubleshooting” section for more
information 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, and then push and hold the
Reset button to return the amplier to
Run mode (factory default) or Standby/
Stop mode (if the amplier has been
congured to start up in Standby mode).
See the “Troubleshooting” section for
information on correcting 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.

97-8004167 07-14-17 Information subject to change 15
7224 & 7226 OPERATOR’S MANUAL – SECTION 4
4.1.5 Fault Status Indicators
Four Fault Status indicators are located on the
amplier front panel (see Figure 4.4). These LEDs
monitor the internal conditions of the amplier
and will illuminate when a fault condition occurs.
Depending on the fault condition and the congu-
ration of the unit, the amplier may be placed in
Standby mode when a fault condition occurs. Re-
fer to the chart in Figure 4.6 to determine the fault
condition being indicated and the action required
to clear the fault condition.
NOTE: See the “Applications” section for fault
status indicator interpretation when operating a
multi-amp system.
4.2 Back-Panel Controls
and Connectors
This section provides an overview of Back-Panel
controls and connectors found on the 7224/7226.
Please refer to Figure 4.7 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.
BNC Input Connector – This input option pro-
vides 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.
Terminal Block Input Connector – This input op-
tion provides a balanced input. It can also be used
as an unbalanced 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 4.7 – Back Panel Controls and Connectors

Information subject to change 97-8004167 07-14-17
7224 & 7226 OPERATOR’S MANUAL – SECTION 5
16
5 Advanced Conguration
The 7224/7226 amplier was designed to offer
exceptional 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 an overload condi-
tion occurs 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 amplier has been pre-congured to your
specications before shipping from the factory.
These initial settings are detailed on your 7224 or
7226 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.
5.1 Conguration Access Panel
The 7224/7226 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
5.1. 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
5.2 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 5.2.
• Master/Slave setting for stand-alone or multi-
ple-amplifier systems.
• Variable or Fixed Gain setting.
• Controlled Current/Controlled Voltage setting.
Figure 5.1 – Access Panel Screw Locations

97-8004167 07-14-17 Information subject to change 17
7224 & 7226 OPERATOR’S MANUAL – SECTION 5
• 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 Load setting to trig-
ger Standby mode when amplifier senses an
Overload state.
Figure 5.2 – Main Board Location Inside
Access Panel
Figure 5.3 – Master/Slave Setting
Figure 5.4 – Gain Trim Control
5.2.2 Fixed Gain/Variable Gain Setting
The 7224/7226 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 connector from jumper J10. Then place a
jumper on the left two pins at that location. See
Figure 5.4.
5.2.1 Master/Slave Setting
To enable the 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 posi-
tion (jumpers across top two pins of each set). The
Master setting is the factory default. To enable the
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 5 .3.
For complete information on multi-amp system
conguration and wiring, please consult the AE
Techron Multi-Amp Conguration Guide avail-
able for download from the AE Techron website at
www.aetechron.com.

Information subject to change 97-8004167 07-14-17
7224 & 7226 OPERATOR’S MANUAL – SECTION 5
18
5.2.3 Controlled-Voltage/
Controlled-Current Mode Setting
To allow the amplier’s output voltage to be con-
trolled by its input voltage signal, place jumper
J4 in the Right position. To allow the amplier’s
output current to be controlled by its input voltage
signal, place jumper J4 in the Left position. See
Figure 5.5. For more information on Controlled-
Current operation, see the “Applications” section
of this manual.
Figure 5.5 – Controlled-Voltage/
Controlled-Current Mode Setting
Figure 5.6 – Compensation Setting
5.2.4 Compensation Setting
(Controlled-Current Mode)
When a 7224 or 7226 amplier is used in Con-
trolled-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
network. Place jumper J5 in the Down position
to select CC2 network. See Figure 5.6. For more
information on Controlled-Current operation, see
the “Applications” section of this manual.
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 following 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.
CAUTION
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 Engi-
neering department.
4. Check to make sure the load has some inductive
component.
5. Provide appropriate Compensation for the load.
6. If oscillation occurs, turn off the amplier im-
mediately.
Failure to follow these guidelines may result in damage to the amplier or load.

97-8004167 07-14-17 Information subject to change 19
7224 & 7226 OPERATOR’S MANUAL – SECTION 5
Figure 5.7 – Run Mode/Stop Mode
on Power-Up Setting
5.2.5 Run Mode/Stop Mode on
Power-Up Setting
The amplier will power-up to Run Mode when
jumper J11 is in the Left position (default setting).
To cause the amplier to enter Stop Mode on
power-up, place jumper J11 in the Right position.
See Figure 5.7.
Figure 5.8 – Standby Mode on Over Load Setting
5.2.6 Standby on Overload Setting
When this latch is enabled, the amplier will move
into Standby mode when it senses an activation of
the IOC (Input/Output Comparator) Distortion Alert
circuit. The IOC Distortion Alert circuit continuously
compares the input waveform to the output wave-
form. When a distortion of more than 0.5% occurs,
the IOC circuit will activate. The amplier will re-
main in Standby Mode until the Reset switch on the
front panel is pushed or a Reset signal is received
on the Interlock – I/O Connector. Once reset, the
amplier will return to Run mode. To enable Stand-
by mode on Over Load, place the jumper across
the two pins labeled J13. See Figure
5 .8.
5.3 Conguration Settings Located on
the Power Supply Board
The following custom settings can be made via
plug-in connectors located on the Power Supply
Board:
• Amplifier Voltage Potential setting (high current
or high voltage)
• Bi-Level Power Supply setting
5.3.1 Accessing the Power Supply
Board
To access the Power Supply Board, follow the in-
structions given at the beginning of this Section to
open the Conguration Access Panel. The Power
Supply Board is located to the right of the Main
Board, as shown in Figure 5.9.
5.3.2 Changing Amplier Voltage
Potential
The amplier can be congured for High Current
(90V) or High Voltage (180V) operation via user-
selectable plugs on the Power Supply Board.
Complete the following steps to change the ampli-
er voltage potential.
1. Locate the two XFMR sections (left of Line
Voltage sections) (see Figure 5.10).
2. For High Current (90V) Output (see Figure
5.11).
3. For High Voltage (180V) Output (see Figure
5.12).

Information subject to change 97-8004167 07-14-17
7224 & 7226 OPERATOR’S MANUAL – SECTION 5
20
5.3.3 Changing Bi-Level Power Supply
Function
The amplier provides three Bi-Level switch set-
tings: Automatic, High, or Low. The user can
select between settings via a switch on the Power
Supply Board.
To access and change the Bi-Level Power Switch,
follow these steps:
1. Locate the SIM Input Card on the right side of
the rear panel of the amplier.
2. Using a #2 Phillips screwdriver (provided),
remove the 2 screws located at the edges of
the SIM card.
3. Keeping the ribbon cable attached, remove the
SIM card from the amplier until it is completely
clear from the card bay.
4. Locate Bi-Level Power Switch, S1, a black,
three-position switch at the rear of the card
bay.(See Figure 5.13)
5. Move Black switch to desired setting. If neces-
sary, use a pointed, non-metallic object (such
as a pen) to help in moving the switch.
a. Automatic – Left
b. Low – Middle
c. High – Right
Figure 5.9 – Accessing the Power Supply Board
Figure 5.10 – Location of Amplier High-Voltage
Transformer Sockets
Figure 5.11 – J3 and J7 Plug Locations for
High-Current Output
Figure 5.12 – J4 and J8 Plug Locations for
High-Voltage Output
Figure 5.13 – Bi-Level Power Switch Location