Yaskawa D1000 Series Power Regenerative Converter - Manual (Page 136)

136 YASKAWA ELECTRIC TOEP C710656 07C YASKAWA Power Regenerative Converter - D1000 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 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.
Table 6.1 General Recommended Daily Inspection Checklist
Inspection Category Inspection Points Corrective Action Checked
Cooling
Inspect for abnormal heat generated from the
converter and visible discoloration.
Check for the following:
• Excessive load.
• Dirty heatsink.
• Tighten all loose screws.
• Ambient temperature.
Inspect converter 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 193 for details.
Environment
Verify the converter environment complies with
the specifications listed in
Installation
Environment on page 29 .
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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