6.1 Precautions for maintenance and inspection
The transistorized inverter 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
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, switch power off. When more than 10 minutes have elapsed, make sure
that the voltage across the main circuit terminals P<+>-N<-> of the inverter is 30VDC or less using a tester,
(1) Daily inspections
• Check the following:
1)Motor operation fault
2)Improper installation environment
3)Cooling system fault
4)Unusual vibration and noise
5)Unusual overheating and discoloration
• During operation, check the inverter input voltages using a tester.
Always run the inverter in a clean state.
When cleaning the inverter, gently wipe dirty areas with a soft cloth immersed in neutral detergent or ethanol.
Note: Do not use solvent, such as acetone, benzene, toluene and alcohol, as they will cause the inverter
surface paint to peel off.
Do not use detergent or alcohol to clean the display and other sections of the operation panel (FR-
DU04) or parameter unit (FR-PU04) as these sections may deform.
Check the areas inaccessible during operation and requiring periodic inspection. For periodic inspection,
1) Cooling system fault :
2) Tightening check and retightening :
3) Check the conductors and insulating materials for corrosion and damage.
4) Measure insulation resistance.
5) Check and replace the cooling fan and relay.
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Clean the air filter, etc.
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.