Inspection - YASKAWA L1000A Technical Manual

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.
◆ 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
Motor Inspect for abnormal oscillation or noise coming from 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 specifications listed
Environment
in Installation Environment on page
The drive output current should not be higher than the motor or drive
Load
rating for an extended period of time.
Power Supply Voltage Check main power supply and control voltages.
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
Table 7.1 General Recommended Daily Inspection Checklist
Inspection Points
42.
Corrective Action
• Check the load coupling.
• Measure motor vibration.
• Tighten all loose components.
Check for excessive load.
• 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
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.
7.2 Inspection
Checked
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