Voltech AT3600 User manual

VOLTECH INSTRUMENTS
AC Interface Fixture
User Manual

VOLTECH AC INTERFACE USER MANUAL 98-072 ISS 7 PAGE - 2 -
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the information given in this manual are subject to change without notice.
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2021 Voltech Instruments. All rights reserved.
Voltech Part Number: 98-072, Issue 7

VOLTECH AC INTERFACE USER MANUAL 98-072 ISS 7 PAGE - 3 -
DANGER OF ELECTRIC SHOCK
Only qualified personnel should install this equipment, after reading and understanding this user manual. If in doubt,
consult your supplier.
Please consult the safety information section of this user manual before installation and use.
RISQUE D'ELECTROCUTION
L'installation de cet équipement ne doit être confiée qu'à un personnel qualifié ayant lu et compris le présent
manuel d'utilisation. Dans le doute, s'adresser au fournisseur.
GEFAHR VON ELEKTRISCHEM SCHOCK
Nur entsprechend ausgebildetes Personal ist berechtigt, diese Ausrüstung nach dem Lesen und Verständnis dieses
Anwendungshandbuches zu installieren. Falls Sie Zweifel haben sollten, wenden Sie sich bitte an Ihren Lieferanten.
RISCHIO DI SCARICHE ELETTRICHE
Solo personale qualificato può installare questo strumento, dopo la lettura e la comprensione di questo manuale.
Se esistono dubbi consultate il vostro rivenditore.

VOLTECH AC INTERFACE USER MANUAL 98-072 ISS 7 PAGE - 4 -
Contents
1. Introduction...........................................................................6
1.1. Features & Abilities.............................................................................................................................................6
1.2. Package Contents ..............................................................................................................................................7
1.3. Choosing an AC Source .....................................................................................................................................8
1.4. Choosing step-up or step-down Transformer...................................................................................................12
1.5. Summary of Advantages & Disadvantages......................................................................................................16
1.6. Operating Description.......................................................................................................................................17
2. Installation...........................................................................18
2.1. General .............................................................................................................................................................18
2.2. Power Amplifier or Source with On / Off Control ..............................................................................................19
2.3. AT Output Transformer.....................................................................................................................................20
2.4. Connectiosn to the Test Fixture........................................................................................................................21
3. Using the AT Editor Software ............................................23
3.1. Configuration of External Source in AT Ediotr..................................................................................................23
3.2. Current Sense Method .....................................................................................................................................28
3.3. Selection of External AC Source in PC Editor..................................................................................................29
3.4. Testing The Complete system..........................................................................................................................30
3.5. Use of X Tests in an At Editor ATP program....................................................................................................33
3.6. Integration of AC Interface tests with IR, HPDC, HPAC, DCRT, ACRT, DCVB, ACVB Tests........................34
3.7. Integration of AC Interface tests with ILK, SURG, MAGI, STRW, WATT, VOC Tests....................................35
4. Technical Information ........................................................36
4.1. Recommended Spares & Accessories.............................................................................................................36
4.2. Details of Connector Functions ........................................................................................................................37
4.3. Using a Current Transformer............................................................................................................................42
4.4. Choosing an AT Output Transformer ...............................................................................................................44
5. Specification .......................................................................45
5.1. Tests Available for Use with the AC Interface ..................................................................................................45
5.2. MAGX – Magnetising Current...........................................................................................................................46
5.3. VOCX – Open Circuit Voltage ..........................................................................................................................47
5.4. STRX & WATX – Stress Wattage & Wattage...................................................................................................48
5.5. Typical External AC Source Specification ........................................................................................................49
5.6. General .............................................................................................................................................................49
5.7. EMC Compliance..............................................................................................................................................50
5.8. EMC Precautions..............................................................................................................................................51
6. Warranty & Service.............................................................52
6.1. Warranty ...........................................................................................................................................................52
6.2. Service..............................................................................................................................................................52
6.3. Obtaining Service and Applications Support ....................................................................................................52
7. Safety Information ..............................................................53
7.1. Safety Features ................................................................................................................................................53
7.2. Safety Instructions ............................................................................................................................................53
7.3. Error Messages ................................................................................................................................................54

VOLTECH AC INTERFACE USER MANUAL 98-072 ISS 7 PAGE - 5 -
7.4. Compliance with EN954 ...................................................................................................................................56

VOLTECH AC INTERFACE USER MANUAL 98-072 ISS 7 PAGE 6
1. INTRODUCTION
Thank you for choosing to use this Voltech product.
If you experience any difficulty during installation or use of the Voltech AC Interface or are unsure of any of its
features or abilities, please do not hesitate to contact either your local Voltech supplier or one of our Voltech
main service centres.
1.1. FEATURES &ABILITIES
The Voltech AC Interface is a versatile, easy-to-use accessory for the Voltech AT3600/AT5600 transformer
tester. The AC Interface:
•Extends the range of wound components that may be tested by the AT3600/AT5600 by allowing a variety
of third-party AC sources to provide the test signal
•Can be used with either
A simple step-up or step-down transformer for 0-600V , < 25W
External sources that provide up to 600V @ 10A, 20Hz to 5 kHz for testing higher power transformers.
•Automatically controls the AC source to optimise test speed and enhance operator safety.
•Integrates the AC source seamlessly into the AT3600/AT5600 environment and allows all other standard
tests to be executed in the same program that is used by the external source.
•Fits into the rear part of the fixture bay on an AT3600/AT5600.
•Provides a convenient method of connection between the source, the AT3600/AT5600 and the test piece.
•Comes with all necessary inter-connecting leads supplied.
•Isolates the AT3600/AT5600 from the external source, when the external source is not being used,
preventing damage to the source during later high-voltage testing.
•Allows a step-up or step-down transformer to be used to boost the voltage or current of the
AT3600/AT5600's internal generator.
•Makes four tests available for use with the AT3600/AT5600 and an AC source:
oMAGX - Magnetising Current (External Source)
oVOCX - Open Circuit Voltage (External Source)
oWATX - Wattage (External Source)
oSTRW - Stress Wattage (External Source)

VOLTECH AC INTERFACE USER MANUAL 98-072 ISS 7 PAGE 7
1.2. PACKAGE CONTENTS
The following items are supplied with your AC interface. Please check that you have every item and report any
missing items to your Voltech supplier as soon as possible.
Voltech AC Interface Fixture
Kelvin clip leads, 10A rated (Voltech# 78-060)
For use during program design, or when the transformer does not have existing fixturing.
One black (Voltech# 78-067) and one red (Voltech# 78-068) 4mm safety to 4mm stackable AC test leads
For connecting the 'External Source Output' connectors of the Interface to the test fixture.
Two pairs of red (Voltech# 78-057) and black (Voltech# 78-058) 4mm safety to bare tinned leads.
One pair for connecting the external source or transformer secondary to the ‘Input from External Source’
connector of the AC Interface.
The other pair for connecting the 'AT Transformer Drive Output' to the primary of a transformer (if used).
One yellow 4mm and one blue 4mm safety socket.
For fitting to your existing test fixture to accept the leads from the 'External Source Output' of the AC Interface.
One current transformer CT 10-20 (Voltech# 31-132)
A precision current transformer that fits directly onto the AC Interface.
This is rated to 10 Amps AC RMS , with a ratio of 1:20 to step down the current so the AT can measure. This
is the default ratio that is set when you configure the external source in the At Editor program.
Certificate of Conformance

VOLTECH AC INTERFACE USER MANUAL 98-072 ISS 7 PAGE 8
1.3. CHOOSING AN AC SOURCE
To provide system reliability, integration with existing tests and operator safety, the Voltech AC Interface must
be able to control the output of the external AC source that is being used with it.
The AC Interface allows two distinct types of AC sources to be used for testing:
•A power amplifier or an AC source configured as an Amplifier (analogue control)
•A voltage or current step-up transformer
A power amplifier is an AC source that can be configured so that its AC voltage output is a fixed multiple of a
small AC voltage control input.
The output frequency of a power amplifier is the same as the input frequency of the small AC voltage control.
A power amplifier is Voltech’s preferred choice of an external AC source to be used with the AT3600/AT5600
transformer tester and the AC Interface. Using a power amplifier, the AT3600/AT5600 will:
•Control the ramp-up and ramp-down of voltage to reduce settling time and optimise test speed.
•Control the ramp-up of voltage to reduce inrush current.
•Program any combination of voltage and frequency that the AC source can provide quickly and
accurately. Different voltage / frequency combinations can be used within one program.
•Accurately trim to the desired output voltage to reduce errors due to the regulation of the source
and the resistance of leads and connections.
Voltech recommends the following AC Sources.
1. Chroma Model 61600 Series - A low-cost AC Power Source solution.
•Voltage range: 0-150V/0-300V/Auto
•Frequency: 15Hz – 1000Hz
•Output power from 500VA to 4000VA, depends on model selected.
•For more details, please visit http://www.chromausa.com/product/low-power-programmable-ac-
source-61600/
2. Pacific Power ASX-115T Series - A commonly available single-phase powered AC source that can provide
132V / 106 at 1500VA.
•Frequency: 15Hz - 1200Hz Direct, 45Hz – 1200Hz with output transformer
•It also has a built-in transformer mode, which allows up to 330V.
•For more details, please visit http://www.pacificpower.com/English/Products/ASX-Series.aspx
3. Trek Model 2100HF – A high-frequency, high speed wide bandwidth amplifier.
•Voltage range: 0 – 150Vpk, Output Current: 0 – 300mApk
•Frequency: 0 – 2.6MHz, Slew Rate: 2kV/us typical
•For more details, please visit http://www.trekinc.com/products/2100HF.asp
Power Amplifier
(x 50)
AC Power Out
0 - 250V @ 10A
AC Control In
0 - 7.07 Vrms
(+/-10Vpk)

VOLTECH AC INTERFACE USER MANUAL 98-072 ISS 7 PAGE 9
1.3.1 Worked Example of Chroma 61602
(CT10-20 module not shown fitted, but will be required)

VOLTECH AC INTERFACE USER MANUAL 98-072 ISS 7 PAGE 10
1.3.2 AC Source and STEP-UP UP Transformer combined
Note: When using an Amplifier AND an additional external step-up transformer connected to the output of an
Amplifier to increase the output voltage, a non-polarised capacitor must be wired in series with the output of
the Amplifier and the drive of the step-up transformer due to offsets in the Amplifier which cannot be trimmed.
Selecting a capacitor:
C = (Im * N2 ) /( 2 * π* Fm * Vm * 10%)
CVoltageRating = ( 2 * Vm * 10%) / N
Where:
C is the Capacitor value (Farads)
CVoltageRating is the voltage rating of the capacitor (V)
Fm is the test frequency (Hz)
Vm is the measured voltage of the component under test (V)
Im is the measured current of the component under test (A)
N is the ratio of the step-up output transformer
Worked Example:
Using a 1:3 transformer connected to the output of an Amplifier and a Test parameter of
Vm = 440 V
Im = 80 mA
F = 50 Hz.
Find the series Capacitor needed.
C = (0.08 * 3 * 3) / ( 2 * 3.14 * 50 * 440 * 0.1) = 52.11 uF
CVoltageRating = ( 2 * 440 * 0.1) / 3 = 29.3 Volts
Therefore, a non-polarised capacitor with a value of around 50 uF and ≥ 30 V must be wired in series with the
output of the Amplifier and the drive of the step-up transformer