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SECTION 6
Troubleshooting and Maintenance
6-1 Troubleshooting
6-1-1 Safety Messages
Please read the following safety messages before troubleshooting or perform-
ing maintenance on the inverter and motor system.
!WARNING Wait at least ten (10) minutes after turning OFF the input power supply before
performing maintenance or an inspection. Otherwise, there is a 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 insu-
lated 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.
6-1-2 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 mis-
takes.
• 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.
6-1-3 Inspection Items
This chapter provides instructions or checklists for these inspection items:
• Daily inspection
• Periodical inspection (approximately once a year)
• Insulation resistance (Megger) test (approximately once two years)
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