Annual inspection
Item | Inspection | Methods and tools | Expected results |
|---|---|---|---|
Input / output circuitry insulation | Insulation between input/output terminals and earth terminal | Measure Disconnect the Clean Power VFD and short R/S/T/U/V/W terminals, and then measure from each terminal to the ground terminal. Use a DC 500V insulation meter. | Must be above 5 MΩ |
Input / output terminals | Tightening torque of all screw terminals. | Manual validation Is there anything loose in the device? | All screw tightened at the specified torque. |
Connections and cables | Are there any corroded cables? Is there any damage to cable insulation? Check cable for breakage and deterioration (crack, discoloration, etc.). | Visual | No abnormality |
Terminal blocks | Check for damage. | Visual | No abnormality |
Motor | Insulation resistance | Measure Disconnect the cables for terminals U/V/W and test the wiring. Measure the insulation between U/V/W and the earth terminals with a DC 500V insulation meter. | Must be above 5 MΩ |
Safety function STO (to be done for STO1 and STO2) | Check the power output | Turn off the main power supply of the Clean Power VFD and then on again. Activate the STO function and the RUN function. Connected test: While the motor is running, activate the STO function. | STO alarm is displayed. No voltage between U/V/W terminals. |