PdM S-411 MCSA Motor Analyzer Toolbox

دستگاه آنالیز جریان PdM S-411

PdM S-411 MCSA Motor Analyzer Toolbox*

A Powerful, Portable Motor Monitoring Instrument for Inspection, PdM and Troubleshooting



Maintenance experts need to minimize costs associated with unexpected motor failures and utility downtime.

The Motor Analyzer PDM S-411 is a motor troubleshooting tool that helps maintenance staff to minimize failures and maximize the runtime of machine that drives their production.

The PDM S-411 uses advanced software algorithms to monitor and assess motor conditions. This algorithm evaluates all parts of the machine while the motor is in operation. Exceptional Asset Management Unit (AMU) features makes the PDM S-411 a powerful predictive maintenance and troubleshooting solution.


AMU analyzes three-phase motor current and voltage signals to generate an instant condition assessment report. AMU can analyze three-phase AC motors with and without variable speed drives, induction motors, synchronous motors, and generators in low, medium or high voltage ranges.

It is also able to implement HVDC to the motor winding as per IEEE std 43 for Insulation Resistance measurement including PI, DAR and respective graph which show any contamination and moisture trapped in the winding insulation.



The “Core i5” Windows 7-based PdM S-411 analyses data using several testing domains. These include:

  • Power quality
  • Power Circuit (cables, loose connection etc.) 
  • Stator winding parameters     
  • Stator Winding Insulation  
  • Rotor Winding insulation (for wound rotors)   
  • Rotor Cage and Rotor Bars (for squirrel cage rotors)        
  • AirGap and eccentricity of rotor   
  • Machine performance
  • Rotor Influence Check (RIC)
  • Current RMS trend and imbalance
  • Current vs. Voltage Spectrum
  • THD & Crest Factor
  • Shaft Torque (continuous and torque fluctuation)
  • Variable-frequency drives
  • Continuous monitoring
  • Transient analysis
  • Mechanical failures
  • Power Loss and efficiency



Test result of each motor is stored in a standardized database format, which can show the historic trend of motor condition. Records of multiple motors with data from multiple PdM S-411 reports are easily created on the analyzer itself. Reports include a managerial result in which normal, caution and alarm limits for each parameter of the motor is tabulated and the measured value is compared automatically. The result also includes respective technical tables and graphs in PDF Format. The PdM S-411 hardware and software interface are very user friendly. Software features include graphically-displayed data such as phasor diagrams, rotor bar pass frequency, three-phase currents and voltages, instantaneous voltage, sym­metrical components and Inrush currents.



Hard-to-detect issues such as broken rotor bars, bad short ring connection or bearing faults can be detected with the instrument’s spectrum analysis capabilities. These include rotor bar pass frequencies, demodu­lated spectrum, harmonics and rotor bar tests, which all help to confirm mechanical and electrical problems and their correlation.

These capabilities are enhanced with the high resolution of the spectrum and the ability of the operator to select, zoom in and focus on specific frequency component for detailed inspection. The ana­lyzer can set frequency cursers on a graph that are specific to a given machine system’s design.



An innovative high-tech feature of PdM S-411 is that it can measure the rotor angle with a Wireless component. It is not necessary to couple any shaft encoder to the rotor. The small magnetic box RO-360® (manufactured by MEPCO) sticks on any place of the rotor and you have the rotor angle rotation on PdM S-411. No indicator/gauge is needed. This could very useful in Rotor Influence Check test as well as in-site balancing.



Time waveforms are essential for iden­tification of underlying causes of parameters and transient con­ditions. They graphically represent voltage, current and torque vs. time.

Transient torques can easily over-stress a machine system, but be very difficult to identify. Contonuous torque fluctuation can also lead to shaft or coupling fatigue and break. PdM S-411 provide the means to find torque-related problems.

The torque time and spectrum signatures are used to diagnose mechanical problems, and to clearly identify transient conditions. Users can accurately identify such issues as cavitation, bearing problems, mechanical imbalances, eccentricities, misaligned shafts and more.

The PdM S-411 performs a startup analysis with a transient analysis tool. Traces of RMS currents and voltages from all the three phases are plotted simultaneously. The analyzer displays amplitude of voltage, current and torque at startup, and allows a user to zoom in on, with a cursor to read the data from specific points on graphs.


VFDs pose a unique set of challenges for maintenance professionals. The PDM S-411 displays the V/Hz relationship with respect to time. Its feature to capture the generated VFD voltage in high resolution can reveal the mis-fires in IGBTs and thyristors. This is very useful in VFD setup and commissioning, and improves the ability to troubleshoot VFD issues.



The PDM S-411 provides the means to moni­tor DC motor voltages in a DC motor’s operational environment. It provides spectrum analysis of these signals to identify problems that are otherwise hard to detect or assess.



The PDM S-411 gives maintenance teams a powerful tool to trouble­shoot problems in a predictive manner and avoid costly unplanned down­time. The maintenance professionals have the means to minimize unexpected failures while maxi­mizing uptime of motors and the machinery their production depends upon.

PDM S-411 can also identify such problems as: improper tap settings on transformers •poorly-distributed single-phase loads •excessive number of VFDs without proper filtration •excessive non-harmonic frequencies on a given VFD •improper filters •missing or open power-factor correction •high-resistance joints before they result a major failure.


*MCSA stands for Motor Current Signature Analysis

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