SKF Static Motor Analyzer Baker AWA-IVThe standard in portable electric motor test equipment

IntroductionSecond only to bearing failures, insulation faults account for a major share of motor and generator failures. Such failures can cost hundreds of thousands of dollars of lost productivity from unplanned downtime. Maintenance professionals can avert such motor insulation failures by testing motors when they are in a static state (off-line, be-fore they are placed in service). The Baker AWA-IV performs a wide range of tests on electric motors and generators to provide assurance the motors will operate as they are expected to once in service. This instru-ment supports all major electric motor tests in a portable unit, including surge, polariza-tion index, DC hipot, megohm and winding resistance tests. The Baker AWA-IV is the result of more than 45 years of experience in the design and manufacture of motor winding testers. All Baker AWA-IV testers, which include 2-, 4-, 6- and 12 kV models, are fully compliant with industry-standard IEEE motor test re-commendations. With the Baker AWA-IV, SKF continues to innovate with a steadfast commitment to quality, reliability, and the delivery of products with capabilities cus-tomers demand.

The power of automationThe Baker AWA-IV can be programmed to perform specific sets and queues of tests

automatically, motor after motor. It also pro-vides full manual test control for users that need or want that capability. The Baker AWA-IV is designed with in-dustry-standard embedded PC module technology. The processing module provides a compact platform for Microsoft Windows® that meets the full performance and opera-tional requirements of the analyzer. The PC module, unlike conventional computer motherboard designs, enables the instru-ment to work efficiently and reliably without any need for processor cooling fans. The analyzer performs all requested tests, stores the results, and continuously moni-tors voltage levels while testing. If the in-strument detects a weakness in the insula-tion of a motor being tested, the test is interrupted, the operator is alerted, and all test parameters at the time of the interrup-tion are reported. The Baker AWA-IV performs all of these operations in microseconds, and with a higher degree of precision and safety than can be achieved through use of the analyzer in manual mode. In manual mode, the in-strument can give an operator greater con-trol over specific tests, voltage levels and data collection.

The Baker AWA-IV’s programmed test settings screen, where tests are initiated as well as pre-programmed by users

Programmed operationThe Baker AWA-IV is a high-voltage tester that can be user-programmed with specific sets of tests to be implemented in the field. Routes can be programmed into the instru-ment that define which motors to test, the order of execution, and parameters for each test, including voltages, duration and pass-fail limits. Operators can then conduct tests in the field simply by selecting the pro-grammed motor to ensure a greater degree of reliability in testing procedures. This al-lows for repeatable maintenance testing, which is vital to a successful PM program. form differences, and is sensitive to less

than one percent variance. Shorts among windings in parallel can be located by this analyzer; such shorts could not otherwise be detected with visual comparisons of waveforms. With the Baker AWA-IV, fewer pulses are applied to a winding, which reduces the power required to perform a surge test. With each and every pulse, a new reference waveform is created as test voltages increase up to the determined maximum voltage level. If no turn-to-turn weaknesses are detected, the final pulse waveform is stored digitally as the reference waveform for future testing. This same waveform can serve as a given motor’s reference waveform for several years.

Advanced data collectionWhen testing with the Baker AWA-IV is complete, results can be saved with each permanent test record of each motor. Such documentation is critical to a successful re-liability program. Test results are collected, stored, recalled and managed using a standard Microsoft Access® relational data-base format. Reports generated by the Baker AWA-IV software can be printed or edited using Microsoft Word® for the purpose of identify-ing trends, for insurance records, or for war-ranty requirements for customers. The re-port formats include RTF, MHTML and Microsoft Word (desktop only). Microsoft Access database files make it easy to transfer data to maintenance man-agement software or other database tools and Access is ODBC compliant.

The Baker AWA-IV software produces a summary of test results for a specific motor, and displays multiple tests from different times

View of Baker AWA-IV screen where users can confirm pass or fail status of tested motors

The Baker AT101-ZTX expands the capabilities of SKF static motor analyzers to include testing of DC motors and other low-impedance coils

Low-impedance testsSeries-wound armatures typically have very low impedance, making it difficult to test bar-to-bar armatures with the relatively low current of a standard Baker AWA-IV. When coupled with the high-current surge testing accessory, the Baker AT101-ZTX, the Baker AWA-IV can easily perform these specialized tests on DC motors, form coils and other low-impedance windings.

Turn-to-turn testingThe Baker AWA-IV incorporates the most advanced inter-turn test capabilities offered in a field-portable electric motor analyzer. Computer control and waveform monitoring offer major advantages over instruments confined to manual control. As with the DC step voltage test, the Baker AWA-IV starts surge generation at a low voltage. Each pulse applied to the motor’s winding is digitized, and the resultant wave-form is compared to previous waveforms to detect any sign of turn-to-turn weakness. The pulse-to-pulse error area ration (PP-EAR) technique is applied to compare wave-

A DC motor bar-to-bar report generated by the Baker AWA-IV coupled with a Baker AT101-ZTX

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Baker AWA-IV featuresAWAIV-12HO high-output unit for heavy • duty testing (low turn-count windings; call for more specifics)

Universal input power: 85 V – 265 V AC•

M• Ω, DA, PI, stepped DC, and DC hipot tests to 12 kV for the Baker AWA-IV 12, 6 kV for the Baker AWA-IV 6, 4 kV for the Baker AWA-IV 4, and 2 kV for the Baker AWA-IV 2, with four ranges of current measurement 100/10/1/0,1 µA, 1 000 /100/10/1 µA overcurrent trip levels. Accurate to 50 000 MΩ. DC power supply is regulated to 0,01%. (IEEE compliant)

RJ45 ethernet access plug for Cat5 • ethernet connection

MS Windows embedded operating system •

High-resolution color LCD touch screen •

USB port for ease of data transfer and • direct attachment to a USB printer

Shock-mounted internal chassis, with • hard drive shock mounting

Baker AWA-IV 6, Baker AWA-IV 12, and • Baker AWA-IV 12HO each operate with optional Baker power pack units

Surge test (all units) is IEEE522 compliant•

The Baker AWA-IV is compatible with Baker 24, 30, and 85 hipot and surge/hipot power packs

Resistance lead accessory for the Baker AWA-IV static motor analyzer

Kelvin resistance bridge-relay matrix, • with 5 A (Baker AWA- IV 12 and Baker AWA-IV 6), 2 A (Baker AWA-IV 4 and Baker AWA-IV 2) maximum applied DC current source. Kelvin relay-matrix is comprised of a separate, removable set of Kelvin clips. Unit high voltage leads retain the ability to perform test sequence; however, for low resistances, the Kelvin test leads are used (IEEE compliant)

If loaded on a desktop computer with • Microsoft Word, the AWA software generates MS Word Reports

Removable keyboard and mouse (not • required for testing)

Industry-standard PC module system • board with 100 percent optically isolated signal/readout and controls for high volt-age circuitry

Improved testing capabilities:•

– Continuous ramped hipot (IEEE 95)

– Programmable stepped hipot (IEEE 95)

– Enhanced reference surge waveform

– Improved PI/DA test (IEEE 43)

– Improved DC hipot (IEEE 95)

– Improved resistance test (IEEE 118)

– Sensitive surge test (IEEE 522)

Step-voltage test results screen on the Baker AWA-IV

Corrected line-to-line resistance chart from the Baker AWA-IV

A very large motor stator set up for testing with an SKF static motor analyzer and power pack.

Power pack compatibilityThe Baker 24, Baker 30 and Baker 85 power packs are high-performance impulse generators that enable a Baker AWA-IV to test very high voltage windings. The output is controlled by a variable transformer that produces up to a maximum of 30 000 volts. These power packs perform both surge and DC hipot tests when used with a Baker AWA-IV as the control and display unit.

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Baker Instrument Company, an SKF Group Company 4812 McMurry Avenue, Fort Collins, CO 80525 USA T: +1 970-282-1200 • +1 800-752-8272 • F: +1 970-282-1010

® SKF is a registered trademark of SKF Group.

Microsoft Windows and Microsoft Access are registered trademarks of Microsoft Corporation.

© SKF Group 2013The contents of this publication are the copyright of the publisher and may not be reproduced (even extracts) unless prior written permis-sion is granted. Every care has been taken to ensure the accuracy of the information contained in this publication but no liability can be accepted for any loss or damage whether direct, indirect or consequential arising out of the use of the information contained herein. Infor-mation in this brochure is subject to change without notice.

PUB CM/P2 13287 EN · January 2013Printed in the U.S.A on environmentally-friendly paper.

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Baker AWA-IV/12 kV Baker AWA-IV/12 kV HO Baker AWA-IV/6 kV Baker AWA-IV/4 kV Baker AWA-IV/2 kV

Surge testOutput voltage 0 to 12 000 V 0 to 12 000 V 0 to 6 000 V 0 to 4 250 V 0 to 2 160 VMax output current 600 A 800 A 250 A 450 A 250 APulse energy 2,88 J 7,2 J 0,72 J 0,9 J 0,2 Storage capacitance 0,04 µF 0,1 µF 0,04 µF 0,1 µF 0,1 µFSweep range 2,5 to 200 µs/Div 2,5 to 200 µs/Div 2,5 to 200 µs/Div 2,5 to 200 µs/Div 2,5 to 200 µs/DivVolts division 500/1 000/2 000/3 000 500/1 000/2 000/3 000 500/1 000/2 000/3 000 500/1 000/2 000/3 000 500/1 000/2 000/3 000Repetition rate 5 Hz 5 Hz 5 Hz 5 Hz 5 HzVoltage measurement and accuracy ± 12% ± 12% ± 12% ± 12% ± 12%

DC HiPot testOutput voltage 0 to 12 000 V 0 to 12 000 V 0 to 6 000 V 0 to 4 250 V 0 to 2 160 VMax output current 1 000 µA 1 000 µA 1 000 µA 1 000 µA 1 000 µACurrent resolution 0,1, 1, 10, 100 µA/Div 0,1, 1, 10, 100 µA/Div 0.1, 1, 10, 100 µA/Div 0.1, 1, 10, 100 µA/Div 0.1, 1, 10, 100 µA/DivOver-current trip settings 1, 10, 100, 1 000 µA 1, 10, 100, 1 000 µA 1, 10, 100, 1 000 µA 1, 10, 100, 1 000 µA 1, 10, 100, 1 000 µAFull scale voltage and current measurement and accuracy ± 5% ± 5% ± 5% ± 5% ± 5%MΩ accuracy ± 10% ± 10% ± 10% ±10% ± 10%Max MΩ reading >50 000 MΩ >50 000 MΩ >50 000 MΩ >50 000 MΩ >50 000 MΩ

Resistance measurements 0,001 to 800 Ω 0,001 to 800 Ω 0,001 to 800 Ω 0,001 to 100 Ω 0,001 to 100 Ω

Physical characteristics Weight 42 lb/19,1 kg 50 lb/22,7 kg 42 lb/19,1 kg 18 lb/8,2 kg 18 lb/8,2 kgDimensions, in (W x H x D) 16 x 8 x 21 16 x 8 x 21 16 x 8 x 21 15 x 8 x 8 15 x 8 x 8Power requirements 85 to 264 V AC

50/60 Hz at 2,5 A85 to 264 V AC 50/60 Hz at 2,5 A

85 to 264 V AC 50/60 Hz at 2,5 A

85 to 264 V AC 50/60 Hz at 2,5 A

85 to 264 V AC 50/60 Hz at 2,5 A

Specifications