Inspection; Inspection; Recommended Daily Inspection - YASKAWA U1000 Technical Manual

7.2 Inspection

7.2

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.
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Recommended Daily Inspection

Table 7.1 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.
Inspection Category
Inspect for abnormal oscillation or noise coming from
Motor
the motor.
Inspect for abnormal heat generated from the drive or
motor and visible discoloration.
Cooling
Inspect drive cooling fan and circulation fan operation.
Verify the drive environment complies with the
Environment specifications listed in
page 58.
The drive output current should not be higher than the
Load
motor or drive rating for an extended period of time.
Power Supply Voltage Check main power supply and control voltages.
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Table 7.1 General Recommended Daily Inspection Checklist
Inspection Points
Installation Environment
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual
Corrective Action
• Check the load coupling.
• Measure motor vibration.
• Tighten all loose components.
Check for the following:
• Excessive load.
• Loose connections.
• Dirty heatsink or motor.
• Ambient temperature.
Check for the following:
• Clogged or dirty fan.
• Correct Fan operation parameter setting.
Eliminate the source of contaminants or correct poor
on
environment.
Check for the following:
• Excessive load.
• Correct motor parameter settings.
• Correct the voltage or power supply to within
nameplate specifications.
• Verify all main circuit phases.
Checked