6.2 Inspection
Power electronics have limited life and may exhibit changed 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 3 months after installation.
u
Recommended Daily Inspection
Table 6.1 outlines the recommended daily inspection for Yaskawa drives. Check the following
items on a daily basis 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 connect or disconnect 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. The charge indicator LED
will extinguish when the DC bus voltage is below 50 Vdc. To prevent electric shock, wait at least one minute
after all indicators are OFF and measure the DC bus voltage level to confirm safe level.
Table 6.1 General Recommended Daily Inspection Checklist
Inspection
Category
Inspection Points Corrective Action Checked
Motor
• Inspect for abnormal oscillation or noise
coming from the motor.
• Check the load coupling.
• Measure motor vibration.
• Tighten all loose components.
Cooling
• Inspect for abnormal heat generated
from the drive or motor and visible
discoloration.
• Check for excessive load.
• Loose connections
• Check for dirty heatsink or motor.
• Ambient temperature
Cooling Fan • Inspect drive cooling fan operation.
• Check for clogged or dirty fan.
• Check fan operation drive parameter.
Environment
• Verify the drive environment complies
with the specifications listed in the
Installation section of this manual.
• Eliminate the source of contaminants
or correct poor environment.
6.2 Inspection
YASKAWA ELECTRIC TOEP C710606 25B YASKAWA AC Drive J1000 Installation & Start-Up Manual
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6
Periodic Inspection &
Maintenance
2/6/2008-14:44
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