Mitsubishi Electric 800 Series Instruction Manual page 597

7
PRECAUTIONS FOR MAINTENANCE AND
INSPECTION
This chapter explains the PRECAUTIONS FOR MAINTENANCE AND INSPECTION for this product.
Always read the instructions before using the equipment.
For the PRECAUTIONS FOR MAINTENANCE AND INSPECTION of the separated converter type, refer to the FR-F862
(Separated Converter Type) Instruction Manual (Hardware).
7.1
Inspection item
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.
 Precautions for maintenance and inspection
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/+ and N/- of the inverter is not more than 30 VDC using a
tester, etc.
7.1.1 Daily inspection
Basically, check for the following faults during operation.
• Motor operation fault
• Improper installation environment
• Cooling system fault
• Abnormal vibration, abnormal noise
• Abnormal overheat, discoloration
7.1.2 Periodic inspection
Check the areas inaccessible during operation and requiring periodic inspection.
Consult us for periodic inspection.
• Check and clean the cooling system. Clean the air filter, etc.
• Check the tightening and retighten.
• Check the conductors and insulating materials for corrosion and damage.
• Measure the insulation resistance.
• Check and change the cooling fan and relay.
596
7. PRECAUTIONS FOR MAINTENANCE AND INSPECTION
7.1 Inspection item
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. (Refer to page 44.)