Alpha 6000S series User Manual page 184

Chapter 8 Maintenance
During the inspection, elements cannot be dismantled or shaken freely. Moreover, connectors cannot be pulled out
freely. Otherwise, the frequency inverter may not be able to run normally or may enter the fault display state. Even,
element faults may be caused or the main switch element IGBT module or other elements may be damaged.
When measurement is required, it should be noted that results with great difference may be got with different
instruments. It is recommended that the moving-coil voltmeter be used to measure the input voltage, the bridge
voltmeter be used to measure the output voltage, clamp-on ammeter be used to measure the input & output current,
and the electric wattmeter be used to measure the power. If conditions are inadequate, the same meter can be used for
measurement and record should be reserved to facilitate comparison.
If the waveform test is required, it is suggested the oscilloscope with the scanning frequency larger than 40MHz be
used. When the instantaneous waveform is tested, the oscilloscope with the frequency over 100MHz should be
used. Before the test, electric isolation should be done for the oscilloscope.
The recommended connection method for electric measurement of the main circuit is showed in Figure 8-1 below
and the instruction is showed in Table 8-3:
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