6-1 Inspection and Maintenance Note 1: For output voltage, use a measurement device that displays effective values of fundamental wave. For current and electric power, use a measurement device that displays all effective values. Note 2: The Inverter output waveform, under PWM control, has a margin of error, especially at a low frequency. Note 3: General-purpose testers are not applicable because of noise in many cases. 6 Inspection and Maintenance 6-10 Measurement Method of Output Voltage R U R/L1 U/T1 Inverter S V Power supply S/L2 V/T2 Motor T W T/L3 W/T3 2 W 220 kΩ Diode 600 V 0.1 A min. (200-V class) + 1000 V 0.1 A min.
(400-V class) VDC Moving coil type Effective value of fundamental wave VAC - 300 V (200-V class) VAC = 1.1 × VDC 600 V (400-V class) Measurement Method of Output Voltage