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Recommended Periodic Inspection
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.
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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 five minutes after all indicators are OFF and measure the DC bus voltage level to confirm safe level.
Table 7.2 Periodic Inspection Checklist
Inspection Area
Inspection Points
Corrective Action
Checked
Main Circuit Periodic Inspection
General
• Overall check of the main power circuit and
ground terminals
Take appropriate actions (e.g., tightening loose
connections).
• 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.
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.
• Check for tightness.
• 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.
Cooling System Periodic Inspection
Cooling Fan
• Check for abnormal oscillation or unusual noise.
• Check for damaged or missing fan blades.
• Replace as required.
•
Refer to Drive Cooling Fans on page 316
for information
on cleaning or replacing the cooling fan.
Heatsink
• Inspect for dust or other foreign material collected
on the surface.
• Remove foreign particles and dust 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.
LED Periodic Inspection
LEDs
• Make sure the LED lights correctly.
• 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 LED or keypad.
• Clean the LED.
Note:
Periodic inspections should be performed every one or two years. The drive, however, may require more frequent inspection due to poor
environments or rigorous use.
7.2 Inspection
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
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Periodic Inspection & Maintenance