7.2 InspectionYASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 379Periodic Inspection &Maintenance7 Recommended Periodic InspectionTable 7.2 outlines the recommended periodic inspections for YASKAWA drive installations. Although periodicinspections should generally be performed once a year; the drive may require more frequent inspection in harshenvironments 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 prematuredeterioration in performance or product failure. Copy this checklist and mark the “Checked” column after eachinspection.WARNING! Electrical Shock Hazard. Do not inspect, connect, or disconnect any wiring while the power is on. Failure to comply canresult in serious personal injury. Before servicing the drive, disconnect all power to the equipment. The internal capacitor remainscharged even after the power supply is turned off. After shutting off the power, wait for at least the amount of time specified on the drivebefore touching any components.Table 7.2 Periodic Inspection ChecklistInspection Area Inspection Points Corrective Action CheckedMain Circuit Periodic InspectionGeneral• Inspect equipment for discoloration from overheating ordeterioration.• Inspect for damaged or deformed parts.• Replace damaged components as required.• The drive has few serviceable parts and may require completedrive 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 avacuum cleaner to avoid touching parts.• Replace components if cleaning is not possible.Conductors and Wiring• Inspect wiring and connections for discoloration, damage, or heatstress.• 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 crackedinsulation.• Check coil voltage for over or under voltage conditions.• Replace damaged removable relays contactors or circuitboard.Braking Resistors Inspect for discoloration of heat stress on or around resistors. • Minor discoloration may be acceptable.• If discoloration exists check for loose connections.Electrolytic Capacitor• Inspect for leaking, discoloration, or cracks.• Check if the cap has come off, for any swelling, or if the sideshave burst open.The drive has few serviceable parts and may require completedrive replacement.Diode, IGBT (PowerTransistor) Inspect for dust or other foreign material collected on the surface. Remove foreign particles and dust by sucking them out with avacuum cleaner to avoid touching parts.Motor Periodic InspectionOperation Check Check for increased vibration or abnormal noise. Stop the motor and contact qualified maintenance personnel asrequired.Control Circuit Periodic InspectionGeneral • Inspect terminals for stripped, damaged, or loose connections.• Make sure all terminals have been properly tightened.• Tighten loose screws and replace damaged screws orterminals.• If terminals are integral to a circuit board, then board or drivereplacement may be required.Circuit BoardsCheck for any odor, discoloration, and rust. Make sure connectionsare properly fastened and that no dust or oil mist has accumulated onthe surface of the board.• Fix any loose connections.• If an antistatic cloth or vacuum plunger can't be used, replacethe board.• Do not use any solvents to clean the board.• Remove foreign particles and dust by sucking them out with avacuum cleaner to avoid touching parts.• The drive has few serviceable parts and may require completedrive replacement.Cooling System Periodic InspectionAir filter Check for dirty or clogged filter. Replace the air filter. Refer to page 405 for detail.Cooling Fan, Circulation FanControl 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 383 forinformation 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 avacuum cleaner to avoid touching parts.Air Duct Inspect air intake and exhaust openings. They must be free fromobstruction and properly installed.• Visually inspect the area.• Clear obstructions and clean air duct as required.Display Periodic InspectionDigital Operator• Make sure data appears on the operator properly.• Inspect for dust or other foreign material that may have collectedon surrounding components.• Contact your YASKAWA representative if there is any troublewith the display or keypad.• Clean the digital operator.
