Motor Loads
Adjustable Speed Drives
4
53
Measuring Frequency of Motor Current
The frequency of the motor current correlates with motor speed.
1
Open the main menu.
2
3
Make connections as shown below:
Vary the speed of the motor and look at the frequency and the waveshape
of the current. The frequency of the current should correlate with the
speed of the motor.
4 Repeat this measurement for phase 2 and phase 3.
Note
Because there is no voltage signal present, the frequency is
calculated from the current signal on input 2.
VOLTS
AMPS
HERTZ
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