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Troubleshooting
Safety Messages
Please read the following safety messages before troubleshooting or performing
maintenance on the inverter and motor system.
WARNING: Wait at least five (5) minutes after turning OFF the input power supply
before performing maintenance or an inspection. Otherwise, there is the danger of
electric shock.
WARNING: Make sure that only qualified personnel will perform maintenance,
inspection, and part replacement. Before starting to work, remove any metallic objects
from your person (wristwatch, bracelet, etc.). Be sure to use tools with insulated
handles. Otherwise, there is a danger of electric shock and/or injury to personnel.
WARNING: Never remove connectors by pulling on its wire leads (wires for cooling fan
and logic P.C.board). Otherwise, there is a danger of fire due to wire breakage and/or
injury to personnel.
General Precautions and Notes
• Always keep the unit clean so that dust or other foreign matter does not enter the
inverter.
• Take special care in regard to breaking wires or making connection mistakes.
• Firmly connect terminals and connectors.
• Keep electronic equipment away from moisture and oil. Dust, steel filings and other
foreign matter can damage insulation, causing unexpected accidents, so take special
care.
Inspection Items
This chapter provides instructions or checklists for these inspection items:
• Daily inspection
• Periodical inspection (approximately once a year)
• Insulation resistance test
6−2
Troubleshooting and
Maintenance