11 Maintenance and Inspection
11 - 10
High-function General-purpose Inverter 3G3RX-V1 User's Manual (SBCE-367)
Use the following procedure to check conditions of the inverter and converter units by using a tester.
1
Disconnect the externally connected power supply wires (R/L1, S/L2, T/L3), the motor
connection wires (U/T1, V/T2, W/T3), and the regenerative braking resistance (P/+2, RB).
2
Have a tester ready. Use the 1 Ω resistance measurement range.
Measure the resistance at the inverter main circuit terminals block R/L1, S/L2, T/L3, U/T1, V/T2, W/T3,
RB, P/+2, and N/– by alternating the polarity of the tester to judge the electrical continuity.
Precautions for Correct UsePrecautions for Correct Use
• Before starting the test, measure the voltage between P/+2 and N/– in the DC voltage range to
check that the smoothing capacitor is sufficiently discharged.
• The tester will show nearly infinite resistance if an element has no continuity.
However, it may not show infinite resistance if a momentary continuity is detected due to the
influence of the smoothing capacitor.
With continuity, an element will show a resistance from a few ohms to several tens of ohms.
The inverter or converter unit is in good condition if the measured value for each item in the
following table is nearly equal, although it does not match exactly because of the element type,
tester type, and so on.
• The regenerative braking circuit is provided for Inverters with a capacity of 22 kW or lower.
In case that you find any problems during inspection, contact your OMRON sales representative.
11-3-3 Inverter/Converter Unit Test
Preparation
Test Method
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