Yaskawa R1000 Series Power Regenerative Unit - Manual (Page 116)

116 YASKAWA ELECTRIC TOEP C710656 08B 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
Table 6.1 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
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
o:
Operator-Related Settings on page 166 for details.
Environment
Verify the regenerative unit environment complies with
the specifications listed in
Installation Environment on
page 25 .
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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