Yaskawa AC Drive Z1000 AC Drive HVAC Fan - Manual (Page 164)

u Recommended Periodic Inspection
Table 2.2 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, 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 for at least the time specified on the warning label; after all indicators are OFF, measure for unsafe voltages to confirm the drive is safe
prior to servicing.
Table 2.2 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.
• Remove foreign particles and dust 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 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.
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.
Remove foreign particles and dust 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, 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.
• Remove foreign particles and dust with a vacuum
cleaner to avoid touching parts.
The drive has few serviceable parts and may require
complete drive replacement.
Cooling System Periodic Inspection
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.
•
Refer to Drive Cooling Fans on page 169 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 with a vacuum
cleaner to avoid touching parts.
2.2 Inspection
164 YASKAWA ELECTRIC SIEP YAIZ1U 03A YASKAWA AC Drive – Z1000 Programming Manual