The Fluke MDA550III 4-Channel Motor Drive Analyzer, 500 MHz saves time and eliminates the hassle of setting up complex measurements, while simplifying motor-drive troubleshooting. Simply select a test and the step-by-step guided measurements show the user where to make voltage and current connections, while the preset measurement profiles ensure that the user will capture all of the data needed for each critical motor-drive section — from the input to the output, the DC bus, and the motor itself. From basic to advanced measurements, the MDA-550-III has users covered, and with a built-in report generator that can quickly and easily generate as-found, and as-left reports with confidence.

The MDA-550-III is the ideal portable motor-drive analysis test tool, and can help safely locate and troubleshoot typical problems on inverter type motor-drive systems.

Measure key motor-drive parameters including voltage, current, DC Bus voltage level and AC ripple, voltage and current unbalance and harmonics, voltage modulation, and motor shaft voltage discharges.

Perform extended harmonics measurements to identify the effects of low and high order harmonics on an electrical power system.

Conduct guided measurements for motor-drive input, DC bus, drive output, motor input and shaft measurements with graphical step-by-step voltage and current connection diagrams.

Use simplified measurement setup with preset measurement profiles to automatically trigger data collection based on the chosen test procedure.

Create reports quickly and easily that are perfect for documenting troubleshooting and collaborative work with others.

Measure additional electrical parameters with full 500 MHz oscilloscope, meter and recording capability for complete range of electrical and electronic measurement on industrial systems.

The Fluke MDA-550-III Motor Drive Analyzer uses guided test measurements to make analysis easier than ever

Drive input

Measure input voltage and current to quickly see whether values are within acceptable limits by comparing the drive’s nominal rated voltage to the actual supplied voltage. Then, check the input current to determine if the current is within the maximum rating and the conductors are suitably sized. Users can also check whether the harmonic distortion is within an acceptable level by visually inspecting the waveform shape or by viewing the harmonics spectrum screen which shows both the total harmonic distortion and individual harmonics.

Voltage and current unbalance

Check the voltage unbalance at the input terminals so that users can ensure the phase unbalance is not too high (> 6-8 %), and that the phase rotation is correct. Users can also check the current unbalance, as excessive unbalance may indicate a drive rectifier problem.

Extended harmonic measurements

Excessive harmonics are not just a threat to rotating machines but also to other equipment connected to the electrical power system. The MDA-550-III provides the ability to discover the harmonics of the motor-drive but can also discover the possible effects of inverter switching electronics. The MDA-550-III has three harmonic ranges, 1st to 51st Harmonics, 1 to 9 kHz and 9 kHz to 150 kHz giving the ability to detect any harmonic pollution problems.

DC bus

In a motor-drive the conversion of AC to DC inside the drive is critical, having the correct voltage and adequate smoothing with low ripple is required for the best drive performance. High ripple voltage may be an indicator of failed capacitors or incorrect sizing of the connected motor. The record function can be used to check DC bus performance dynamically in the operating mode while a load is applied.

Drive output

Check the output of the drive focusing both on voltage to frequency ratio (V/F), and voltage modulation. When high V/F ratio measurements are experienced, the motor may overheat. With low V/F ratios, the connected motor may not be able to provide the required torque at the load to sufficiently run the intended process.

Voltage modulation

Measurements of the Pulse Width Modulated signal are used to check for high voltage peaks which can damage motor winding insulation. The rise time or steepness of impulses is indicated by the dV/dt reading (rate of voltage change over time), this should be compared to the motor’s specified insulation. The measurements can also be used to measure switching frequency to identify whether there is a potential issue with electronic switching, or with grounding, where the signal floats up and down.

Motor input

Ensuring that voltage is being supplied at the motor input terminals is key, and the selection of cabling from drive to the motor is critical. Incorrect cabling selection can result in both drive and motor damage due to excessive reflected voltage peaks. Checking that the current present at the terminals is within the motor rating is important as over current condition could cause the motor to run hot, decreasing the life of the stator insulation which can result in the early failure of the motor.

Motor shaft voltage

Voltage pulses from a variable speed drive can couple from a motor’s stator to its rotor, causing a voltage to appear on the rotor shaft. When this rotor shaft voltage exceeds the insulating capacity of the bearing grease, flashover currents (sparking) can occur, causing pitting and fluting of the motor bearing race, damage that can cause a motor to fail prematurely. The MDA-550-III is supplied with carbon fiber brush probe tips that can easily detect the presence of destructive flashover currents, while the impulse amplitude and count of events will enable users to take action before failure occurs. The addition of this accessory allows users to discover potential damage without investing in expensive permanently installed solutions.

Step-by-step guided measurements ensure users have the data they need, when they need it

The MDA-550-III is engineered to help users quickly and easily test and troubleshoot typical problems on three-phase and single-phase inverter type motor-drive systems. The on-screen information, and step-by-step setup guidance make it easy to configure the analyzer and get the drive measurements they need to make better maintenance decisions, fast. From power input to the installed motor, the MDA-550-III provides the measurement capability for the fastest motor-drive troubleshooting.

Reporting and analysis

The MDA-550-III simplifies the process of gathering data and writing test reports with a built-in report generator.

At each test point or measurement there is the option to create, update or modify a report. Simply press ‘SAVE TO REPORT’ and select the appropriate screens to save into a text based report file.

By performing the step-by-step guided measurements a comprehensive report can be created directly from the instrument to document the entire troubleshooting process.

Input the report name. The single report encompasses all recorded measurements and can easily be shared with other users and used for motor drive benchmarking, and for comparing data now and in the future.

The Fluke 1587FC True-RMS Megohmmeter/Insulation Resistance Tester and Multimeter with Fluke Connect Compatibility combines a digital insulation tester with a fully-featured, True-RMS digital multimeter into a single, compact, handheld unit, which provides maximum versatility for both troubleshooting and preventative maintenance.

The Fluke 1587 FC is rugged, reliable and easy to use. Whether working on motors, generators, cables, or switch-gear, this instrument is ideally suited to help with many troubleshooting tasks.

The Fluke 1587 FC adds four powerful new diagnostic functions through the Fluke Connect Measurements app:

PI/DAR timed ratio tests with TrendIt graphs helps you more quickly identify moisture and contaminated insulation problems

Memory storage eliminates the need for handwritten results, reducing human error, while saving data for historical tracking over time

Temperature compensation establishes accurate baselines and relevant historical comparisons

Historical tracking and trending of assets helps you pinpoint degradations over time

Fluke Connect: See it. Save it. Share it. All the facts, Right in the Field

Fluke Connect with ShareLive video call lets you stay in contact with your entire team without leaving the field. The Fluke Connect mobile app is available for Android and iOS and works with over 20 different Fluke products. Make the best decisions faster than ever before by viewing all temperature, mechanical, electrical and vibration measurements for each equipment asset in one place. Get started saving time and money by increasing your productivity.