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Precautions for Maintenance and Inspection
3.2 Precautions for Maintenance and Inspection
The power regeneration common converter is a static unit mainly consisting of semiconductor devices. Daily
inspection must be performed to prevent any fault from occurring due to adverse influence by the operating
environment, such as temperature, humidity, dust, dirt and vibration, changes in the parts with time, service life, and
other factors.
3.2.1 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 power regeneration common converter for inspection, switch power off. When more than 10 minutes
have elapsed, make sure that the voltage across the main circuit terminals P/L+-N/L- of the inverter is 30VDC or
less using a tester, etc.
The dedicated stand-alone reactor is very hot. Exercise care not to get burnt.
3.2.2 Check items
(1) Daily inspections
z Check the following:
1)Improper installation environment
2)Cooling system fault
3)Unusual vibration and noise
4)Unusual overheating and discoloration
z During operation, check the power regeneration common converter input voltages using a tester.
(2) Cleaning
Always run the power regeneration common converter in a clean state.
When cleaning the inverter, gently wipe dirty areas with a soft cloth immersed in neutral detergent or ethanol.
3.2.3 Periodic inspection
Check the areas inaccessible during operation and requiring periodic inspection. For periodic inspection, consult us.
1) Cooling system:............................ Clean the air filter, etc.
2) Screws and bolts: ......................... These parts may become loose due to vibration, temperature changes, etc.
Check that they are tightened securely and retighten as necessary.
3) Conductors and insulating materials: Check for corrosion and damage.
4) Insulation resistance: Measure.
5) Cooling fan, relay: Check and change if necessary.
Note: Do not use solvent, such as actone, benzene, toluene and alcohol, as they will cause the power
regeneration common converter surface paint to peel off.
Do not use detergent or alcohol to clean the LED display section, which is easily affected by them.