2.2 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.
u
Recommended Daily Inspection
Table 2.1 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.
Table 2.1 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 the following:
• Excessive load.
• Loose connections.
• Dirty heatsink or motor.
• Ambient temperature.
Inspect drive cooling fan and circulation fan operation.
Check for the following:
• Clogged or dirty fan.
• Correct Fan operation parameter setting.
Environment
Verify the drive environment complies with the
specifications listed in the Specifications chapter in the
User Manual packaged with the drive.
Eliminate the source of contaminants or correct poor
environment.
Load
The drive output current should not be higher than the
motor or drive rating for an extended period of time.
Check for the following:
• Excessive load.
• Correct motor parameter settings.
Power Supply Voltage Check main power supply and control voltages.
• Correct the voltage or power supply to within
nameplate specifications.
• Verify all main circuit phases.
2.2 Inspection
YASKAWA SIEP YAIZ1U 03B YASKAWA AC Drive – Z1000 Programming Manual
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2
Periodic Inspection &
Maintenance
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