Inspection item
INSPECTION AND MAINTENANCE 311
6. INSPECTION AND MAINTENANCE
6.1 Inspection item
6.1.1 Daily inspection item
Inverter is mainly composed of semiconductor components. In order to prevent faults caused by influence of
environment such as temperature, humidity, dust and vibration, or aging and service life of used parts, users must
do daily inspections
1. Whether the surrounding environment for installation is normal (temperature, humidity, dust density around
inverter).
2. Whether the power supply voltage is normal (whether the three-phase voltage between terminals R/L1, S/L2
and T/L3 is normal).
3. Whether the wirings are firm (whether the external wirings of the main circuit terminal and the control board
terminal are firm).
4. Whether the cooling system is normal (whether there is abnormal sound at the fan operation and whether the
connecting wire is firm).
5. Whether the indicator light is normal (such as LED indicator on control board, LED indicator on keypad and LED
on keypad screen).
6. Whether the motor is running as expected.
7. Whether there is abnormal vibration, sound or smell at the motor operation.
8. Whether there is liquid leakage in the filter capacitor on the capacitor board.
Pay attention to safety during inspection!
6.1.2 Periodical inspection items
Inspect places that can be inspected only when inverter stopped, inspect specific places on a regular basis.
1. Inspect whether the connectors and connecting wires are normal (inspect whether the connectors and
connecting wires between main circuit board and control board are firm or damaged).
2. Inspect whether there is overheating components on main circuit board and control board.
3. Inspect whether there is liquid leakage in the electrolytic capacitors on the main circuit board and control board.
4. Inspect IGBT module on main circuit board.
5. Make sure to clean the dust and sundries on the circuit board.
6. Check the insulation resistance.
7. Inspect the cooling system for abnormalities (whether fan connection line is firm or not, and make sure to clean
the air filter/duct).
8. Inspect whether frame is firm or not and tighten the fixing screw.
9. Inspect whether the external wires and terminal are damaged or not.
Pay attention to safety during inspection!
Caution
Caution
