Measurement of main circuit voltages, currents and powers
Precautions for maintenance and inspection
7 - 16
7.2.2 Measurement
of
voltages and use of PT
Inverter input side
As the input side voltage has a sine wave and it is extremely small in distortion, accurate measurement
can be made with an ordinary AC meter.
Inverter output side
Since the output side voltage has a PWM-controlled rectangular wave, always use a rectifier type volt-
meter.
A needle type tester cannot be used to measure the output side voltage as it indicates a value much
greater than the actual value.
A moving-iron type meter indicates an effective value which includes harmonics and therefore the
value is larger than that of the fundamental wave.
The value monitored on the operation panel is the inverter-controlled voltage itself. Hence, that value
is accurate and it is recommended to monitor values (analog output) using the operation panel.
PT
No PT can be used in the output side of the inverter. Use a direct-reading meter. (A PT can be used in
the input side of the inverter.)
Summary of Contents for FR-A820-00046 (0.4K)
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Page 144: ...System configuration for Ethernet communication FR A800 E Installation and wiring 2 114 ...
Page 202: ...Basic operation procedure JOG operation Basic operation 4 32 ...
Page 1090: ...Check first when you have a trouble Protective functions 6 50 ...
Page 1189: ...Appendix EC Declarations of Conformity FR A800 A 49 ...
Page 1190: ...EC Declarations of Conformity Appendix A 50 ...
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Page 1212: ...EC Declarations of Conformity Appendix A 72 A 7 2 FR A846 series ...
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