Inspection - YASKAWA CIMR-DC4A0040AAA Technical Manual

6.2 Inspection

6.2 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 converter.
Converters contain a variety of power electronics such as power transistors, semiconductors, capacitors, resistors, fans,
and relays. The electronics in the converter 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 converter 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 6.1 outlines the recommended daily inspection for the Yaskawa converter. 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.
NOTICE: Check the operation of the cooling fan only during inspections.
Inspection Category
Inspect for abnormal heat generated from the
converter and visible discoloration.
Cooling
Inspect converter cooling fan and circulation fan
operation
Verify the converter environment complies with
Environment the specifications listed in
Environment on page
Power Supply
Check main power supply and control voltages.
Voltage
◆ Recommended Periodic Inspection
Table 6.2 outlines the recommended periodic inspections for Yaskawa converter installations. Although periodic
inspections should generally be performed once a year, the converter may require more frequent inspection in harsh
environments or with rigorous use. Operating and environmental conditions, along with experience in each application,
will determine the actual inspection frequency for each installation. Periodic inspection will help to avoid premature
deterioration in performance or product failure. Copy this checklist and mark the "Checked" column after each
inspection.
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Table 6.1 General Recommended Daily Inspection Checklist
Inspection Points
Installation
29.
YASKAWA ELECTRIC SIEP C710656 06F YASKAWA Power Regenerative Converter - D1000 Technical Manual
Corrective Action
Check for the following:
• Excessive load.
• Dirty heatsink.
• Tighten all loose screws.
• Ambient temperature.
Check for the following:
• Clogged or dirty fan.
• Correct Fan operation parameter setting. Refer to
Operator-Related Settings on page 181
Eliminate the source of contaminants or correct poor
environment.
• Correct the voltage or power supply to within
nameplate specifications.
• Verify all main circuit phases.
Checked
o:
for details.