YASKAWA AC Drive-A1000 - Recommended Periodic Inspection

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Recommended Periodic Inspection
Table 7.2 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 the drive, disconnect all power to the equipment. The internal capacitor remains charged even
after the power supply is turned off. After shutting off the power, wait for at least the amount of time specified on the drive before touching
any components.
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.
• Use dry air to clear away foreign matter. Use a
pressure of 39.2 × 10
4
to 58.8 × 10
4
Pa
(4 - 6 kg•cm
2
).
• 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 overvoltage or undervoltage
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.
• Check for loose connections if discoloration exists.
Electrolytic 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.
Use dry air to clear away foreign matter. Use a
pressure of 39.2 × 10
4
to 58.8 × 10
4
Pa
(4 - 6 kg•cm
2
).
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 cannot be
used, replace the board.
• Do not use any solvents to clean the board.
• Use dry air to clear away foreign matter. Use a
pressure of 39.2 × 10
4
to 58.8 × 10
4
Pa
(4 - 6 kg•cm
2
).
The drive has few serviceable parts and may require
complete drive replacement.
7.2 Inspection
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
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Periodic Inspection & Maintenance