YASKAWA A1000

7.2 Inspection
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 379
Periodic Inspection & Maintenance
7
 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 dri
ve 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.
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
de
terioration.
• 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
s
tress.
• 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 excessi
ve noise during operation.
• Inspect coils for signs of overheating such as melted or cracked
i
nsulation.
• 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.
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 r
eplacement.
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, dam
aged, or loose connections.
• Make sure all terminals have been p
roperly tightened.
• Tighten loose screws and r
eplace damaged screws or
terminals.
• If terminals are integral to a circu
it 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
Air filter Check for dirty or clogged filter. Replace the air filter. Refer to page 405 for detail.
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.
R
efer to Cooling Fan and Circulation Fan on page 383 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 m
aterial that may have collected
on surrounding components.
• Contact your YASKAWA representative if t
here is any trouble
with the display or keypad.
• Clean the digital operator.