This Power Quality and Motor Analyzer adds key mechanical measurement capabilities for electric motors to the cutting-edge power quality analysis functions of the Fluke 430 Series II Power Quality Analyzers. Quickly and easily measure and analyze key electrical and mechanical performance parameters such as power, harmonics, motor speed, unbalance, torque and mechanical power without the use of mechanical sensors.
The ideal portable tool for motor analysis testing, the 438-II can help locate, prevent, predict and troubleshoot power quality problems in three-phase and single-phase power distribution systems, while giving technicians the mechanical and electrical information they need to evaluate motor performance effectively.
Calculates the amount of rotational force (displayed in lb.ft or Nm) developed by a motor and transmitted to a driven mechanical load. The motor torque is the single most critical variable that characterizes the instantaneous mechanical performance of rotating equipment driven by electric motors.
Provides the instantaneous motor shaft rotational speed. Combined with the motor torque, motor speed provides a snapshot of the mechanical performance of rotating equipment driven by electric motors.
Measures the actual mechanical power (displayed in hp or kW) produced by motors and provides a direct link to overloading conditions without simply basing it on the motor current.
Shows the effectiveness of each motor within a machine, assembly line, plant, and/or facility in converting electric power to useful mechanical work. By properly aggregating the efficiencies of a population of motors the total (aggregate) efficiency can be estimated. Comparisons to expected motor efficiencies at observed operating conditions can help quantify the cost associated with motor energy inefficiency.
Using proprietary algorithms, the Fluke 438-II Power Quality and Motor Analyzer uses three phase current and voltage waveforms to calculate motor torque, speed, load and efficiency at a 1 second update rate. The motor air gap field, as observed via the voltage/current waveforms, provides the basis for the measurements. Mechanical sensors and intrusive no-load motor testing is not required, making it faster than ever to analyze overall electric motor performance.
Simply hookup the voltage measurement leads and flexible current probes to the service supplying the motor.
Input details of the motor from the rating plate including rated power, rated speed and motor type from either NEMA or IEC classifications.
Note: Measurement units can be set to local requirements hp/kW, lb ft/Nm etc.
The Fluke 438-II provides a complete breakdown
of electrical parameters. Prior to beginning motor
analysis, it’s recommended to make base line
power quality measurements to assess the state of
harmonics and unbalance on the electrical service
output as these two properties can have a serious
negative impact, on motor performance.
When in Motor Analysis mode, results are summarized for electrical performance, mechanical performance and derating (according to NEMA recommendations).
The easy to understand four-level color severity scale indicates motor performance in relation to the recommended electrical parameter levels including rated power, power factor, unbalance and harmonics.
For mechanical power you can instantly view the mechanical output power along with motor torque and speed. The mechanical output power is instantly compared with electrical power to provide you with live efficiency measurements. With this feature you can easily measure machine performance during each operation cycle.
The NEMA derating screen is updated as the load and the electrical conditions change, and each new measurement is plotted on the tolerance graph as a “+”. In this example we can see that motor is within tolerance but is close to the service factor. This indicates that there may be a need for power quality mitigation, motor maintenance or some other performance improving adjustment. By frequently performing these tests over time, known benchmarks and performance trends can be created, enabling informed maintenance investment decisions.
|Motor Measurment||Range||Resolution||Accuracy||Default Limit|
|Mechanical motor Power||0.7 kW to 746 kW
1 hp to 1000 hp
|100 % = rated power
100 % = rated power
|Torque||0 Nm to 10 000 Nm
0 lb ft to 10 000 lb ft
|100 % = rated torque
100 % = rated torque
|rpm||0 rpm to 3600 rpm||1 rpm||±3%¹||100 % = rated rpm|
|Efficiency||0 % to 100 %||0.10 %||±3%¹||NA|
|Unbalance (NEMA)||0 % to 100 %||0.10 %||±.15%¹||5%|
|Harmonics Voltage Factor (NEMA)||0 to 0.20||0.1||±1.5%¹||0.15|
|Unbalance Derating Factor||0.7 to 1.0||0.1||indicative||NA|
|Harmonics Derating Factor||0.7 to 1.0||0.1||indicative||NA|
|Total NEMA Derating Factor||0.5 to 1.0||0.1||indicative||NA|
¹Add 5 % error when selecting Motor design type Other
Specification valid for Motor Power > 30 % of rated power
Specification valid at stable operating temperature. Run the motor for at least 1 hour at full load
(2-3 hours if the motor is 50 HP or higher) to obtain stable temperature.
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