Dynamic motor analyzers

Dynamic motor test and monitoring equipment

EP-C01 umbilical cable
SKF Dynamic Motor Analyzer - EXP4000
SKF’s dynamic motor test and monitoring instruments are built to conduct condition monitoring tests of motors and generators from a Motor Control Centre (MCC), or through a Baker EP1000 connection unit. The SKF Dynamic Motor Analyzer – EXP4000 is a low-voltage, AC- and battery-operated instrument that test motors and generators while they are in operation. The EXP4000 provides health and performance data on the motor, the motor's load, and incoming power to assess motor performance and suitability in context of the entire machine system it supports.

For more information, contact your local authorized dealer of SKF electric motor test and monitoring solutions by calling +1 970 282 1200.
SKF Dynamic Motor Analyzer - EXP4000
These portable instruments conduct fully remote monitoring from motor control cabinets (MCCs), and can connect to motors at their operating location (when motor is powered-down for connection only). They are low-voltage, battery-operated (with 110 V AC connection) units designed for rugged use in tight spaces typical of industrial environments.

This in-service/dynamic-state motor analyzer enables root-cause analysis, starting with separation of mechanical and electrical issues that may be present in a motor-machine system. The EXP4000 was designed to pinpoint challenges across the system, which includes power supplied, variable-frequency drive, the motor, and load placed on the motor. The EXP4000 is computer-driven with field-proven engineering to allow all testing to be accomplished directly from an MCC or from the optional SKF EP1000 connection.

The EXP4000 performs seven major functions for predictive maintenance programmes. It identifies possible power circuit problems that degrade motor health, examines overall motor power conditions, monitors the load and observes motor performance plus estimating energy savings. It is programmed to supply information on:
  • Voltage level 
  • Voltage balance 
  • Harmonic and total distortion 
  • Rotor cage condition 
  • Motor efficiency 
  • Effective service factor 
  • Over-current 
  • Operating condition 
  • Torque Load
Once testing is complete, you can save and store results for each individual motor. This type of documentation is critical for any predictive maintenance programme. It allows the recalling of previous information for true trending capabilities. With the EXP4000, collect, store, recall and manage test results using standard MS Access relational database file formats. You can generate reports quickly and easily through the main print console, allowing operators visual confirmation of motor integrity.

Survey plant-wide motor efficiency with the EXP4000 and determine load mismatches, oscillating load, and transient peak energy. These on-line capabilities allow accurate assessment of operating load conditions over time. Results are immediate and show operating efficiencies, allowing the operator to determine the true cost of wasted energy.

Test domains:
  • Power quality: Identifies non-optimal power quality problems that cause additional undue stress to the motor. The voltage level, voltage balance, harmonic distortion, total distortion, power and harmonics test flag frequent problems. This can consist of wrong settings on a supply transformer's taps, poorly distributed single-phase loads, overloading (saturating) supply transformers, excessive VFDs on low voltage busses, excessive non-harmonic frequencies on a VFD, missing line-inductors on VFD applications and missing or open power factor correction capacitors.
  • Machine performance: This group of tests evaluates the present operation of the motor, identifying stressful operation and its source. It looks at effective service factor, load, operation condition, efficiency, and calculates payback period. Common problems found in this area include thermal overloading of the motor, recognizing the deterioration of the machine among other items that are directly related to the motor's health and the energy waster in its inefficiencies.
  • Current: This set of tests identifies problems within the entire machine system. Tests include over-current and current unbalance. These tests look at the health of the entire system and describe a problem within this system as it is related to current. This domain identifies problems; however, the root cause may not be apparent.
  • Spectrum: This domain has the rotor bar test along with the V/I spectrum, demodulated spectrum, and harmonics. This domain shows the current and voltage relationships with regard to frequency. It will electrically find saturation problems, broken rotor bars, excessive VFD drives on low voltage busses and it can verify mechanical problems.
  • Torque: The torque domain is a highly important breakthrough for SKF. These tests, torque ripple and torque spectrum, enable the user to find numerous problems quickly and accurately. This domain specializes in diagnosing mechanical issues, shows transient overloading, and finds mechanical imbalances along with bearing problems and issues such as cavitation.
  • Connections: This portion of the EXP4000 offers multiple additional tools, including phasor diagrams, three currents, three voltages, harmonic bar charts, instantaneous voltage, frequency, symmetrical components, and speed traces for dynamic VFD applications. Jointly, these tools assess bearing health.
  • VFD monitoring (optional): SKF designed the EXP4000 as a comprehensive monitoring tool. Along with any three-phase induction motor and generator, they will also monitor the activities of Variable Frequency Drives (VFD) applications and AC servo motors. For the first time, diagnosis of motor problems can occur even under the most demanding VFD operation. This optional VFD4000 software shows how frequency, speed, torque and voltage level vary with respect to time.
  • Continuous monitoring: The EXP4000 uses SKF’s CM4000 continuous-monitoring software, which enables the user to monitor up to 41 data points in real time. This continuous data gathering capability improves discovery of intermittent problems with motors, such as electrical tripping. An operator can customize monitoring to collect real time data on whatever is deemed the most important to the operation. The EXP4000 can also act as a power analyzer to determine actual power quality.
  • Transient analysis: The EXP4000 can perform a startup transient analysis with an integrated tool. The traces are the RMS currents and voltages of all three phases.
SKF Online Motor Analysis System - Net EP
SKF understands the difficulty faced when trying to both reduce costs and maximize electrical equipment reliability and productivity. The SKF On-line Motor Analysis System – NetEP delivers real-time data on rotating machinery from the convenience of an office or anywhere an internet connection is available. Based upon the monitoring capabilities of the existing proven EXP technology, the NetEP enables centralized data collection mechanisms connected to computer file servers to acquire machine performance data without having to go into the field. It continuously gathers data from multiple voltage busses and motors.

Increase machine service life
The NetEP continuously delivers motor and machine system data that allows maintenance professionals to keep machinery running optimally while averting costly downtime. This data flow provides valuable trending information to improve maintenance or replacement decisions involving machine systems. It helps extend the working life of rotating equipment by providing information needed to locate specific motor and machine system faults before they cause a downtime problem. It acquires and analyzes machine performance at regular intervals, minimizing the need to test each motor or generator with portable equipment at its location (e.g., at an MCC, or a motor’s specific location).

On-line acquisition capabilities
The NetEP integrates a wide range of machine monitoring capabilities within a network framework. This stationary unit collects data from up to seven different voltage busses with a maximum of 32 motors attached to a single NetEP unit. Connect multiple NetEP systems to a single server and it’s possible to monitor thousands of motors located anywhere in the world. The NetEP acquires power quality every 10 seconds and time waveforms once per hour.

Continuous rotating machine evaluation
The NetEP system operates with one voltage measurement per buss and current sensors installed for each motor. It analyzes over 120 electrical parameters and compares the results to user defined limits, alerting the user if these limits are exceeded. Fault alarms are received via a server network connection.

The design demonstrates our ongoing commitment to quality, reliability and competitive advantage. The NetEP provides data on degradation of motor performance and the effects of overheating on motor operation. It also surveys plant motor efficiency, determines load mismatches and identifies oscillating loads. Results and problem notification are immediate, showing operating efficiencies, thereby allowing the user to determine the true cost of wasted energy.
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