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