Measurement of main circuit voltages, currents and powers
INSPECTION AND MAINTENANCE162
6. INSPECTION AND MAINTENANCE
6.1 Inspection item
6.1.1 Daily inspection item
The inverter is a unit mainly consisting of semiconductor devices. Daily inspection must be performed to prevent
any fault from occurring due to the adverse effects of the operating environment, such as temperature, humidity,
dust, dirt and vibration, changes in the parts with time, service life, and other factors.
1. Check whether the surrounding conditions are normal (including temperature, humidity, dust density, etc.) at the
place of the installation.
2. Check whether the power supply voltage is normal (the voltage between R/L1, S/L2 and T/L3).
3. Check whether the wiring is secured (whether the external wiring for the main-circuit board and the
control-board terminal are secured).
4. Check whether the cooling system is normal (whether there’s any abnormal noise during the operation and
whether the wiring is well secured).
5. Check whether the indicator lamp is normal (whether the indicator lamp of the control board and of the operation
panel and the LED monitor of the operation panel are normal).
6. Check whether the operation is as expected.
7. Check whether there is any abnormal vibration, noise or odor during the operation.
8. Check whether there is any leakage from the filter capacitor.
Be careful in inspection!
6.1.2 Periodical inspection items
Check the areas inaccessible during operation and requiring periodic inspection.
1. Check the connectors and wiring (whether the connectors and wiring between the main-circuit board and control
board are secured and without damage).
2. Check whether the components on the main-circuit board and the control board are overheated.
3. Check whether the electrolytic capacitors on the main-circuit board and control board have leakage.
4. Check the IGBT module on the main-circuit board.
5. Clean the dust and foreign substance on the circuit board.
6. Check the insulation resistor.
7. Check whether the cooling system is normal (whether the wiring of fan is secured; clean the air filter, etc.)
8. Check the screws and belts.
9. Check the external wires and the terminal banks for damage.
Be careful in inspection!
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