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7.2 Inspection
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
395
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Recommended Periodic Inspection
outlines the recommended periodic inspections for Yaskawa drive installations. Although periodic inspections
should generally be performed once a year; the drive may require more frequent inspection in harsh environments or with
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.
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Periodic Inspection
WARNING!
Electrical Shock Hazard. Do not inspect, connect, or disconnect any wiring while the power is on. Failure to comply can
result in serious personal injury. Before servicing, 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 for at least the time specified on the warning label; after all indicators are OFF, measure for unsafe voltages to
confirm the drive is safe prior to servicing.
Table 7.2 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 used.
• Remove foreign particles and dust by sucking them out with a
vacuum cleaner to avoid touching parts.
• Replace components if cleaning is not possible.
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.
Capacitor
• Inspect for leaking, discoloration, or cracks.
• Check if the cap has come off, for any swelling, or if the sides
have burst open.
The drive has few serviceable parts and may require complete
drive replacement.
Diode, IGBT (Power
Transistor)
Inspect for dust or other foreign material collected on the surface.
Remove foreign particles and dust by sucking them out with a
vacuum cleaner to avoid touching parts.
Motor Periodic Inspection
Operation Check
Check for increased vibration or abnormal noise.
Stop the motor and contact qualified maintenance personnel as
required.
Control Circuit Periodic Inspection
General
• Inspect terminals for stripped, damaged, or loose connections.
• Make sure all terminals have been properly tightened.
• Tighten loose screws and replace damaged screws or
terminals.
• If terminals are integral to a circuit board, then board or drive
replacement may be required.
Circuit Boards
Check for any odor, discoloration, and rust. Make sure connections
are properly fastened and that no dust or oil mist has accumulated on
the surface of the board.
• Fix any loose connections.
• If an antistatic cloth or vacuum plunger can't be used, replace
the board.
• Do not use any solvents to clean the board.
• Remove foreign particles and dust by sucking them out with a
vacuum cleaner to avoid touching parts.
• The drive has few serviceable parts and may require complete
drive replacement.
Cooling System Periodic Inspection
Cooling Fan,
Circulation Fan,
Control Board Cooling Fan
• Check for abnormal oscillation or unusual noise.
• Check for damaged or missing fan blades.
Replace as required.
Refer to Cooling Fan and Circulation Fan on page 398
for
information on cleaning or replacing the fan.
Heatsink
Inspect for dust or other foreign material collected on the surface.
Remove foreign particles and dust by sucking them out with a
vacuum cleaner to avoid touching parts.
Air Duct
Inspect air intake and exhaust openings. They must be free from
obstruction and properly installed.
• Visually inspect the area.
• Clear obstructions and clean air duct as required.
Display Periodic Inspection
Digital Operator
• Make sure data appears on the operator properly.
• Inspect for dust or other foreign material that may have collected
on surrounding components.
• Contact your Yaskawa representative if there is any trouble
with the display or keypad.
• Clean the digital operator.
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