YASKAWA iQpump1000 User Manual page 302

6.1 Inspection
6.1 Inspection
Power electronics have limited life and may exhibit changes in characteristics or performance deterioration after years of use
under normal conditions. To help avoid such problems, it is important to perform preventive maintenance and periodic
inspection on the drive.
Drives contain a variety of power electronics such as power transistors, semiconductors, capacitors, resistors, fans, and relays.
The electronics in the drive serve a critical role in maintaining proper motor control.
Follow the inspection lists provided in this chapter as a part of a regular maintenance program.
Note: The drive will require more frequent inspection if it is placed in harsh environments, such as:
• High ambient temperatures
• Frequent starting and stopping
• Fluctuations in the AC supply or load
• Excessive vibrations or shock loading
• Dust, metal dust, salt, sulfuric acid, chlorine atmospheres
• Poor storage conditions.
Perform the first equipment inspection one to two years after installation.
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Recommended Periodic Inspection
Table 6.1 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.
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,
Conductors and
damage, or heat stress.
Wiring
• Inspect wire insulation and shielding for wear.
Inspect terminals for stripped, damaged, or loose
Terminals
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.
• 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 Inspect for dust or other foreign material collected on the
(Power Transistor) surface.
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Table 6.1 Periodic Inspection Checklist
Inspection Points
Main Circuit Periodic Inspection
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.
• Remove foreign particles and dust with a vacuum
cleaner to avoid touching parts.
• 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 overvoltage or undervoltage
conditions.
• Replace damaged removable relays, contactors, or
circuit board.
The drive has few serviceable parts and may require
complete drive replacement.
Remove foreign particles and dust with a vacuum
cleaner to avoid touching parts.
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
Checked