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Precautions for maintenance and inspection
3
PROTECTIVE FUNCTIONS
3.3 Precautions for maintenance and inspection
The inverter is a static 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.
3.3.1 Precautions for maintenance and inspection
For some short time after the power is switched off, a high voltage remains in the
smoothing capacitor. When accessing the inverter for inspection, wait for at least 10
minutes after the power supply has been switched off, and then make sure that the
voltage across the main circuit terminals P-N of the inverter is not more than 30VDC
using a tester, etc.
3.3.2 Inspection item
(1) Daily inspection
•Basically, check for the following faults during operation.
1)Motor operation fault
2)Improper installation environment
3)Cooling system fault
4)Abnormal vibration, abnormal noise
5)Abnormal overheat, discoloration
• During operation, check the inverter input voltages using a tester.
(2) Cleaning
Always run the inverter in a clean status.
When cleaning the inverter, gently wipe dirty areas with a soft cloth immersed in
neutral detergent or ethanol.
3.3.3 Periodic inspection
Check the areas inaccessible during operation and requiring periodic inspection.
Consult us for periodic inspection.
1)Cooling system fault. ........................... Clean the air filter, etc.
2)Tightening check and retightening ....... The screws and bolts may become loose
due to vibration, temperature changes, etc.
Check and tighten them.
Tighten them according to the specified
tightening torque.
3)Check the conductors and insulating materials for corrosion and damage.
4)Measure insulation resistance.
5)Check and replace the cooling fan, smoothing capacitor and relay.
CAUTION
Do not use solvent, such as acetone, benzene, toluene and alcohol, as they will
cause the inverter surface paint to peel off.