Yaskawa CIMR-LU Drives - Manual (Page 141)

6 Periodic Inspection & Maintenance
YASKAWA ELECTRIC TOEP C710616 38F YASKAWA AC Drive L1000A Quick Start Guide 141
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6 Periodic Inspection & Maintenance
◆ 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 40 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 40 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.
• 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
Installation Environment on page 17 .
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.
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