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7
PRECAUTIONS FOR MAINTENANCE AND
INSPECTION
This chapter explains the precautions for maintenance and inspection of this product.
Always read the instructions before use.
7.1
Inspection item
The converter unit 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 converter unit for inspection, wait for at least 10 minutes after the power supply has been switched OFF.
Then, make sure that the voltage across the main circuit terminals P/+ and N/- on the converter unit is not more than 30 VDC
using a digital multimeter, 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:
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.
7.1.3
Daily and periodic inspection
Area of
Inspection
inspection
item
Surrounding
environment
Overall unit
General
Power supply
voltage
166
7. PRECAUTIONS FOR MAINTENANCE AND INSPECTION
7.1 Inspection item
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. (Refer to
Description
Check the surrounding air temperature, humidity,
dirt, corrosive gas, oil mist, etc.
Check for unusual vibration and noise.
Check for dirt, oil, and other foreign material.
Check that the main circuit voltage and control
*2
circuit voltage are normal.
page
38.)
Inspection
Corrective action at fault
interval
*3
Daily Periodic
○
Improve the environment.
Check fault location and
○
retighten.
*1
○
Clean.
○
Inspect the power supply.
Check
by
occurrence
user
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