Fluke ScopeMeter 190 Series III User Manual page 66

• Motor Input
Use these functions to check the motor input conditions. The measurements are the same as
Drive Output and help to determine the influence of the cable. Incorrect wiring between drive
and motor can cause contact, voltage drop, and reflection problems that can cause
performance drop or damage to the motor. The measurements are stored separately when
you select Save to Report.
• Motor Shaft Voltage
Use this function to detect bearing grease flash-over currents that can damage motor
bearings. These problems can be caused by high shaft voltages due to fast high voltage
switching of the drive output circuit. A brush on the tip of a probe measures the 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 connect the voltage probes
and current clamps. See
Push E or 4 (NEXT) to show the actual measurement.
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Figure 34.
Figure 34. MDA-550 Connection Diagram
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