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7-3
Figure 7-2. MEASUREMENT LOCATIONS AND DEVICES EXAMPLE
MEASUREMENT POINTS AND METERS
Since the Drive's input/output voltage and current contain high frequencies, selection of the wrong measuring device
can lead to gross miscalculations. When using a CT (current-detection transformer) to measure the current, the amount
of error will be large if the frequency is low. Because of this, always use a CT with as large a capacity as possible. See
the following chart and Figure 7-2 for recommended measurement devices.
RECOMMENDED MEASUREMENT DEVICE CHART
Item Simple Measurement Precision Measurement
Input Voltage Tester - (Voltmeter) Moving-Iron type voltmeter
Input Current Clamp Meter Moving-Iron type ammeter
Input Power — Electrodynamometer type wattmeter
Output Voltage Tester - (Voltmeter) Rectifier type voltmeter
Output Current Clamp Meter Moving-Iron type ammeter
Output Power — Electrodynamometer type wattmeter