Inspection item
98
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.
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.
5.1 Inspection item
5.1.1 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
5.1.2 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 ................... 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
31.)
• Check the conductors and insulating materials for corrosion and damage
• Measure the insulation resistance
• Check and change the cooling fan, internal fan and relay
• Check for condensation .................................... A sudden temperature change may cause water droplets (condensation) to
form inside the inverter. Using the inverter with condensation inside may
cause a failure.
• Check for ingress of water or dust .................... If the waterproof or dustproof performance is impaired, water or dust may
get into the inverter. Using the inverter with water or dust remaining inside
may cause a failure.
• Inspection and replacement of the gasket ........ Changes such as in temperature may cause aging degradation of the
gasket rubber material, which may impair the waterproof and dustproof
performances.
• When using the safety stop function, periodic inspection is required to confirm that safety function of the safety system
operates correctly.
For more details, refer to the Safety stop function instruction manual.
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