Recommended Periodic Inspection - YASKAWA T1000A Technical Manual

7.2 Inspection
u 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.
n
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.
Inspection Area
• Inspect equipment for discoloration from overheating or
deterioration.
• Inspect for damaged or deformed parts.
General
• Inspect for dirt, foreign particles, or dust collection on
components.
• Inspect wiring and connections for discoloration, damage, or heat
Conductors and Wiring stress.
• Inspect wire insulation and shielding for wear.
Terminals • Inspect terminals for stripped, damaged, or loose connections.
• Inspect contactors and relays for excessive noise during operation.
Relays and Contactors • Inspect coils for signs of overheating such as melted or cracked
insulation.
Braking Resistors • Inspect for discoloration of heat stress on or around resistors.
• Inspect for leaking, discoloration, or cracks.
Electrolytic Capacitor • Check if the cap has come off, for any swelling, or if the sides
have burst open.
Diode, IGBT (Power
• Inspect for dust or other foreign material collected on the surface.
Transistor)
Operation Check • Check for increased vibration or abnormal noise.
• Inspect terminals for stripped, damaged, or loose connections.
General
• Make sure all terminals have been properly tightened.
• Check for any odor, discoloration, and rust. Make sure
Circuit Boards connections are properly fastened and that no dust or oil mist has
accumulated on the surface of the board.
Cooling Fan, • Check for abnormal oscillation or unusual noise.
Circulation Fan • Check for damaged or missing fan blades.
Heatsink • Inspect for dust or other foreign material collected on the surface.
• Inspect air intake and exhaust openings. They must be free from
Air Duct
obstruction and properly installed.
• Make sure data appears on the operator properly.
Digital Operator • Inspect for dust or other foreign material that may have collected
on surrounding components.
316
Table 7.2 Periodic Inspection Checklist
Inspection Points
Main Circuit Periodic Inspection
Motor Periodic Inspection
Control Circuit Periodic Inspection
Cooling System Periodic Inspection
Display Periodic Inspection
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
Corrective Action
• Replace damaged components as required.
• The drive has few serviceable parts and may require complete
drive replacement.
• Inspect enclosure door seal if used.
• Use dry air to clear away foreign matter. Use a pressure of
39.2 × 10 to 58.8 × 10
4 4
Pa (4 - 6 kg cm
• Replace components if cleaning is not possible.
• Repair or replace damaged wiring.
• Tighten loose screws and replace damaged screws or
terminals.
• Check coil voltage for over or under voltage conditions.
• Replace damaged removable relays contactors or circuit
board.
• Minor discoloration may be acceptable.
• If discoloration exists check for loose connections.
• The drive has few serviceable parts and may require complete
drive replacement.
• Use dry air to clear away foreign matter. Use a pressure of
39.2 × 10 to 58.8 × 10
4 4 Pa (4 - 6 kg cm
• Stop the motor and contact qualified maintenance personnel
as required.
• 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.
• 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.
• Use dry air to clear away foreign matter. Use a pressure of
39.2 × 10 to 58.8 × 10
4 4
Pa (4 - 6 kg cm
• The drive has few serviceable parts and may require complete
drive replacement.
• Replace as required.
• Refer to Cooling Fan and Circulation Fan on page 319
information on cleaning or replacing the cooling fan.
• Use dry air to clear away foreign matter.
Use a pressure of 39.2 × 10 to 58.8 × 10
4
• Visually inspect the area.
• Clear obstructions and clean air duct as required.
• Contact your Yaskawa representative if there is any trouble
with the display or keypad.
• Clean the digital operator.
Checked
2
).
2 ).
2
).
for
4 Pa (4 - 6 kg cm 2 ).