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YASKAWA ELECTRIC
TOEP C710656 10B YASKAWA Power Regenerative Unit - R1000 Instruction 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 regenerative unit.
Regenerative units contain a variety of power electronics such as power transistors, semiconductors, capacitors, resistors,
fans, and relays. The electronics in the regenerative unit 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 regenerative unit 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
outlines the recommended daily inspection for the Yaskawa regenerative unit. 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.
Table 6.1 General Recommended Daily Inspection Checklist
◆
Recommended Periodic Inspection
outlines the recommended periodic inspections for Yaskawa regenerative unit installations. Although periodic
inspections should generally be performed once a year, the regenerative unit 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.
Inspection
Category
Inspection Points
Corrective Action
Checked
Cooling
Inspect for abnormal heat generated from the regenerative
unit and visible discoloration.
Check for the following:
• Excessive load.
• Dirty heatsink.
• Tighten all loose screws.
• Ambient temperature.
Inspect regenerative unit cooling fan and circulation fan
operation
Check for the following:
• Clogged or dirty fan.
• Correct Fan operation parameter setting. Refer to
Operator-Related Settings on page 155
for details.
Environment
Verify the regenerative unit environment complies with
the specifications listed in
.
Eliminate the source of contaminants or correct poor
environment.
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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