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MDA-550/MDA-510

Users Manual

18

Motor Drive Output

The Motor Drive Output functions check the drive output 
conditions. The modulated output voltage varies with the 
motor speed and load. The output current depends on load 
and correct function of the motor. Unbalance between the 
phases can cause or indicate problems. The stress on the 
motor insulation can be determined by measurement of the 
risetime of a fast modulation pulse.

Voltage and Current (Filtered)

Voltage and Current (Filtered) are measurements of the 
voltage, current, and frequency at one of the phases of the 
motor drive output. The measurement is done with a 10 kHz 
bandwidth filter so that a sinewave shaped voltage 
waveform shows instead of the pulse width modulated 
signal.
The voltage measurement is done between two phases 
(Phase-Phase). The current measurement is done on a 
single phase. Repeat the measurement for the other 
phases.
The display shows the voltage waveform in red and the 
current waveform in blue. The PWM voltage, rms current, 
frequency, and Volt/Hz factor (ratio between voltage and 
frequency) show as readings at the top of the display. The 
PWM voltage shows and not the rms voltage, as PWM 
voltage represents the effective voltage of the switching 
output based on the average value of samples over a whole 
number of periods of the fundamental frequency.

 changes the readings on the display to Volt Peak 

readings or Current Peak readings: Peak-Peak, Maximum 
Peak, Minimum Peak, and Crest Factor (ratio between peak 
and RMS value). 
Tips:
•

Use the V/Hz ratio to check if the ratio is within specified 
limits for the motor. 

•

If V/Hz is too high the motor will overheat and if V/Hz is 
too low the motor will lose torque.

Note 

The peak voltage readings here are the peak of 

the effective voltage and not the peaks of the 

actual PWM voltage. Use the Voltage Modulation 

function to measure PWM voltage.

•

The Voltage and Current (filtered) function detects 
motor overloading. Stable Hz with unstable V readings 
points to dc bus problems. Unstable Hz with stable V 
readings points to IGBT problems. Unstable Hz and 
unstable V readings points to speed control circuits.

•

Check the output voltage on the motor drive with the 
nameplate rating. The current must be within the 
specified Full Load Amps for the motor. Consider the 
motor service factor that specifies the percentage of 
overloading the motor can handle for short periods of 
time. 

•

If the output current is too high, the motor can run hot. A 
10-degree temperature rise can equal 50 % decrease in 
stator insulation life.

Содержание MDA-510

Страница 1: ...2018 2018 Fluke Corporation All rights reserved All product names are trademarks of their respective companies Specifications are subject to change without notice MDA 550 MDA 510 Motor Drive Analyzer Users Manual ...

Страница 2: ...o obtain return authorization information then send the product to that service center with a description of the difficulty postage and insurance prepaid FOB Destination Fluke assumes no risk for damage in transit Following warranty repair the product will be returned to Buyer transportation prepaid FOB Destination If Fluke determines that failure was caused by neglect misuse contamination alterat...

Страница 3: ...ry Pack 4 Symbols 7 In The Box 8 Input Connections 8 Navigation and User Interface 10 Display 12 Keys 13 Motor Drive Input 14 Voltage and Current 14 Voltage Unbalance 15 Current Unbalance 15 Harmonics MDA 550 only 15 Motor Drive DC Bus 17 Voltage DC Level 17 Voltage AC Ripple 17 Table of Contents ...

Страница 4: ...nt Filtered 18 Voltage Modulation 19 Phase Phase 19 Phase Ground 20 Phase DC or DC 20 Spectrum MDA 550 only 20 Voltage Unbalance 20 Current Unbalance 21 Motor Input 21 Motor Shaft MDA 550 only 21 Replay 23 Report 23 FlukeView 2 24 Measurements Overview 25 Specifications 29 ...

Страница 5: ...ing to the selected test procedure Reports Use for troubleshooting and collaborative work with others Additional electrical parameters Full 500 MHz oscilloscope capability is available for the complete range of electrical and electronic measurement on industrial systems This manual describes the functions of the Motor Drive Analyzer that are available when you select the Motor Drive Analyzer key T...

Страница 6: ...nuals Safety Information A Warning identifies hazardous conditions and procedures that are dangerous to the user A Caution identifies conditions and procedures that can cause damage to the Product or the equipment under test XW Warning To prevent possible electrical shock fire or personal injury Read all safety information before you use the Product Carefully read all instructions Do not alter the...

Страница 7: ...ables with plastic safety designed BNC connectors suitable for the Motor Drive Analyzer See Optional Accessories in the Users Manual Do not insert metal objects into connectors Do not wear loose fitting clothing or jewelry and keep long hair tied back when near rotating machinery Use approved eye protection and approved personal protective equipment where necessary Use the Product only as specifie...

Страница 8: ...Check test lead continuity Safe Use of Li ion Battery Pack The battery pack Fluke model BP291 52 Wh has been tested in accordance with the UN Manual of Tests and Criteria Part III Subsection 38 3 ST SG AC 10 11 Rev 3 more commonly known as the UN 38 3 tests and have been found to comply with the stated criteria The battery pack has additionally been tested according to IEC 62133 Recommendations fo...

Страница 9: ... not use any battery which is not designed or recommended by Fluke for use with the Product Take careful notice of correct placement of the battery in the product or the External Battery Charger Do not short circuit a battery pack Do not keep battery packs in a place where the terminals can be shorted by metal objects e g coins paper clips pens or other Never use a battery pack or charger showing ...

Страница 10: ...ks as required for normal and individual use is allowed Always consult national local guidelines that are applicable for shipment by mail or other transporters A maximum of 3 battery packs may be shipped by mail The package must be marked as follows PACKAGE CONTAINS LITHIUM ION BATTERIES NO LITHIUM METAL Recommendations to safe disposal of a battery pack You must properly dispose of a failed batte...

Страница 11: ...ted to the distribution part of the building s low voltage MAINS installation Measurement Category IV is applicable to test and measuring circuits connected at the source of the building s low voltage MAINS installation This product contains a Lithium ion battery Do not mix with the solid waste stream Spent batteries should be disposed of by a qualified recycler or hazardous materials handler per ...

Страница 12: ...arry Case C1740 The MDA 550 includes a Shaft Voltage Test Set to make the connection with a rotating shaft set of 3 brushes probe holder two piece extension rod magnetic base Input Connections The top of the test tool has four safety BNC signal inputs These isolated inputs allow independent floating measurements with each input See Figure 1 Figure 1 BNC Connectors To make motor drive voltage and c...

Страница 13: ...make a motor shaft voltage measurement MDA 550 only 1 Connect the red VP 410 voltage probe to the input A 2 Connect the ground lead of the voltage probe to ground 3 Connect a brush on top of the voltage probe 4 Place the probe in probe holder 5 Use the extension rod and magnetic base to keep the probe in a fixed position and the brush in good contact with the motor shaft Note To maximize the benef...

Страница 14: ...ding Drive Output Use these functions to check the drive output conditions The modulated output voltage varies with the motor speed and load The output current depends on load and correct function of the motor Unbalance between the phases can cause or indicate problems The stress on the motor insulation can be determined by measurement of the risetime of a fast modulation pulse Motor Input Use the...

Страница 15: ...he rotating shaft voltage After you select a measurement location select the specific measurement with Some measurements require another submenu to select the measurement method As an example for voltage and current measurement on the motor drive input select if the measurement is done between 2 phases or between phase and ground After a selection is complete a connection diagram shows how to conn...

Страница 16: ...that the algorithm is partially adapted for optimal results in the selected function HOLD shows on the display when you push to freeze the screen The Status Bar shows the vertical range division for each active channel the time division and the trigger channel The softkeys correspond to the four function keys on the Product The labels and functions change according to the menu that shows on the di...

Страница 17: ... probes Make sure the clamp and the measurement instrument are set to the proper range Use the range select switch on the clamp to adapt the setting if necessary The arrow on the top of the clamp must face towards the load of the circuit Connect the current clamp jaws around the conductor to be measured Manually changes the view of the waveform Select the Input Channel with these keys The D channe...

Страница 18: ...rm continue to show on the display with no change Tips The test tool can compare the rms voltage against the intended nominal voltage The Vrms should be 10 of the intended voltage If the voltage is low Check if the local circuit is overloaded Check if the load of the circuit matches the current rating of the circuit breaker A high current load can result in a low voltage on the drive input Check t...

Страница 19: ...or ratio between peak and rms value of one of the phases Current Unbalance Current Unbalance checks for the difference between current levels of the phases for 3 phase systems To calculate the unbalance value unbalance maximum deviation from average average of three phases x 100 Tips Current unbalance should be 6 and depends on load current and circuit capacity Excessive current unbalance can poin...

Страница 20: ...istortion caused by the harmonics can affect the operation of other electrical equipment on the same circuit Other loads such as motors and transformers can overheat have shortened life and ultimately fail due to the presence of harmonics Tips Voltage and current harmonics are closely related but the percentage levels are usually very different Voltage are a low number and current harmonics are a ...

Страница 21: ...that is too low can trip the drive Low voltage can be caused by low input mains voltage or distorted input voltage by flat topping Tips Use the RECORD function to check the dc voltage stability over time and detect slow fluctuations The test tool continuously records the digital readings of the measurements and displays these as a graph The TrendPlot graph rolls from right to left like a paper cha...

Страница 22: ...s PWM voltage represents the effective voltage of the switching output based on the average value of samples over a whole number of periods of the fundamental frequency changes the readings on the display to Volt Peak readings or Current Peak readings Peak Peak Maximum Peak Minimum Peak and Crest Factor ratio between peak and RMS value Tips Use the V Hz ratio to check if the ratio is within specif...

Страница 23: ...e of pulse of the modulation signal A pulse with a high peak is selected automatically to find the highest dV dt value The readings change to Volt Peak Max dV dt risetime and overshoot percentage when Peak is selected as Risetime with The risetime measurement is based on the IEC 60034 17 method that uses the 10 and 90 values of the peak of pulse This peak value is used as dt in the dV dt reading a...

Страница 24: ...ith a reference lead the same measurement can be applied Phase DC or DC The measurements with a dc positive or negative bus signal as reference is the same as for Phase Phase but with an offset relative to the dc level The Phase dc measurement is also used to measure switch frequency identify IGBT problems or to check if the signal is floating up and down to indicate a system grounding problem Spe...

Страница 25: ...e output except that the phase dc bus measurements are left out for voltage modulation as it is not practical to use the dc bus as reference on the motor input Use the motor input functions to do the same measurements and check the influence of the cable between the motor drive and the motor and then document the measurements separately in a report The voltage modulation measurements are useful to...

Страница 26: ... normally 1 V Due to the fast edges of the switching voltage from a motor drive the shaft voltage for a motor powered by a motor drive can be much higher High Voltage can cause large breakdown currents across the grease barrier causing damage to the bearings Normal unavoidable shaft voltage due to asymmetry in the air gap magnetic field result in peak voltages 5 V and slower than 100 ns which in g...

Страница 27: ...ge waveforms To save a replay screen to a report 1 Push the twice 2 Push SAVE TO REPORT 3 Push to return to the Replay screen Report The MDA 500 Series 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 1 Push SAVE TO REPORT to save the screen as a png file 2 En...

Страница 28: ... an example when SAVE TO REPORT is selected for the second time in the Motor Drive Output Voltage Modulation Phase Phase mode the filename is OUVMPP02 PNG Table 2 shows the filenames that correspond to the selected function FlukeView 2 Refer to the section Connecting to a Computer in the Fluke 190 Series II Users Manual for information about how to connect the USB cable to a computer The setup pro...

Страница 29: ...min V pk to pk Crest Factor A Peak A Peak max A Peak min A pk to pk Crest Factor Phase Ground V A Hz V AC DC A AC DC Hz INVCFG V Peak V Peak max V Peak min V pk to pk Crest Factor A Peak A Peak max A Peak min A pk to pk Crest Factor Voltage Unbalance Unbalance V AC DC V AC DC V AC DC Unbalance INVUNB Peak V pk to pk V pk to pk V pk to pk max Crest Factor Current Unbalance Unbalance A AC DC A AC DC...

Страница 30: ...A pk to pk A pk to pk A pk to pk max Crest Factor Voltage Modulation Phase Phase Zoom 1 V PWM V pk to pk Hz V Hz OUVMPP Zoom 2 V Peak max V Peak min Delta V Zoom 3 PEAK V Peak max Delta V s Risetime Peak Overshoot Zoom 3 LEVEL Delta V Delta V s Risetime Level Overshoot Phase Ground Zoom 1 V PWM V pk to pk V Peak max V Peak min OUVMPG Zoom 2 V Peak max V Peak min Delta V Hz Zoom 3 PEAK V Peak max D...

Страница 31: ...ershoot Zoom 3 LEVEL Delta V Delta V s Risetime Level Overshoot Motor Input Voltage and Current Filtered V A Hz V PWM A AC DC Hz V Hz MIVCF V Peak V Peak max V Peak min V pk to pk Crest Factor A Peak A Peak max A Peak min A pk to pk Crest Factor Voltage Unbalance Unbalance V PWM V PWM V PWM Unbalance MIVUNB Peak V pk to pk V pk to pk V pk to pk max Crest Factor Current Unbalance Unbalance A AC DC ...

Страница 32: ...x V Peak min Delta V Hz Zoom 3 PEAK V Peak max Delta V s Risetime Peak Overshoot Zoom 3 LEVEL Delta V Delta V s Risetime Level Overshoot MDA 550 Only Motor Shaft Shaft Voltage Events off V pk to pk SHAFTV Events on Delta V Rise Fall time Delta V s Events s Motor Drive Input Output and Motor Input Harmonics Voltage V AC DC V fundamental Hz fundamental THD Current V AC DC A fundamental Hz fundamenta...

Страница 33: ... MHz to 25 MHz 10 20 counts True rms voltage V AC DC Maximum voltage with 10 1 or 100 1 probe 1000 V Maximum resolution with 10 1 or 100 1 probe 1 mV Full scale reading 1100 counts DC to 60 Hz 3 10 counts 60 Hz to 20 kHz 4 15 counts 20 kHz to 1 MHz 6 20 counts 1 MHz to 25 MHz 10 20 counts PWM Voltage V Pwm Purpose To measure on pulse width modulated signals like Motor Drive inverter outputs Princi...

Страница 34: ...hest percentage difference of one of the phase vs average of the 3 true rms voltages Accuracy Indicative percentage based on V AC DC values Voltage Unbalance Drive Output and Motor Input Purpose To show the highest percentage difference of one of the phase vs average of the 3 pwm voltages Accuracy Indicative percentage based on V Pwm values Current Unbalance Drive Input Purpose To show the highest...

Страница 35: ...Shaft Voltage Probe 1 1 10 1 100 1 VPS4xx Probe accuracy when adjusted on the test tool DC to 20 kHz 1 20 kHz to 1 MHz 2 1 MHz to 25 MHz 3 for higher frequencies the probe roll off starts affecting the accuracy Safety General IEC 61010 1 Pollution Degree 2 Measurement IEC 61010 2 030 BNC Input A B C D From any terminal to earth ground 1000 V CAT III 600 V CAT IV Between any terminal 300 V CAT IV I...

Страница 36: ...in other environments due to conducted and radiated disturbances Caution This equipment is not intended for use in residential environments and may not provide adequate protection to radio reception in such environments Emissions that exceed the levels required by CISPR 11 can occur when the equipment is connected to a test object Korea KCC Class A Equipment Industrial Broadcasting Communication E...

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