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Recommended Periodic Inspection
Table 6.2 outlines the recommended periodic inspections for Yaskawa drive installations.
Periodic inspections should generally be checked every
3-6 months; however, the drive may
require more frequent inspection due to poor environments or rigorous use. Operating and
environmental conditions, along with experience in each application, will determine the actual
inspection frequency for each installation. Periodic inspection will help to avoid premature
deterioration in performance or product failure. Copy this checklist and mark the “Checked”
column after each inspection.
n
Periodic Inspection
WARNING! Electrical Shock Hazard. Do not connect or disconnect wiring while the power is on. Failure to
comply can result in serious personal injury. Before servicing the drive, disconnect all power to the equipment.
The internal capacitor remains charged even after the power supply is turned off. The charge indicator LED
will extinguish when the DC bus voltage is below 50 Vdc. To prevent electric shock, wait at least one minute
after all indicators are OFF and measure the DC bus voltage level to confirm safe level.
Table 6.2 Periodic Inspection Checklist
Inspection
Area
Inspection Points Corrective Action Checked
Main Circuit Periodic Inspection
General
• Inspect equipment for discoloration
from overheating or deterioration.
• Inspect
for
damaged
or
deformed
parts.
•
Replace damaged components as
required.
•
The drive has few serviceable parts
and may require complete drive
replacement.
• Inspect for dirt, foreign particles, or dust
collection on components.
• Inspect enclosure door seal if
present. Replace components if
cleaning is not possible.
• Remove foreign particles and dust
with a vacuum cleaner to avoid
touching parts.
Conductors and
Wiring
• Inspect wiring and connections for
discoloration, damage, or heat stress.
•
Inspect wire insulation and shielding
for wear.
•
Repair or replace damaged wiring.
Terminals
• Inspect terminals for stripped,
damaged, or loose connections.
• Tighten loose screws and replace
damaged screws or terminals.
Relays and
Contactors
• Inspect contactors and relays for
excessive noise during operation.
•
Inspect coils for signs of overheating
such as melted or cracked insulation.
•
Check
coil
voltage
for
over
or under
voltage conditions.
• Replace damaged removable relays
contactors or circuit board.
Braking
Resistors
• Inspect for discoloration of heat stress
on or around resistors.
• Minor discoloration may be
acceptable.
•
If discoloration exists check for
loose connections.
6.2 Inspection
YASKAWA ELECTRIC TOEP C710606 25D YASKAWA AC Drive J1000 Installation & Start-Up Manual
173
6
Periodic Inspection &
Maintenance
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