192 YASKAWA ELECTRIC TOEP C710687 02B FSDrive-MV1000 Instructions
6.2 Inspection
6.2 Inspection
Power electronics have a 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. The proper functioning of
drives is dependent on the correct operation of all these parts.
Follow the inspection checklists provided in this section as a part of a regular maintenance program. Perform equipment
inspections at intervals of one year after installation.
Note: The drive will require more frequent inspection if it is used under harsh conditions, such as:
• High ambient temperatures
• Frequent starting and stopping
• Fluctuations in the AC supply or load
• Excessive vibration or shock loading
• Atmospheres containing dust, metal dust, salt, sulfuric acid, or chlorine
• Poor storage conditions
Perform the first equipment inspection one year after installation.
u Recommended Daily Inspection
Table 6. 1 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 6.1 General Recommended Daily Inspection Checklist
Inspection Category Details of Inspection Checked
Ambient Environment
Check the ambient temperature.
Check the humidity.
Check for toxic gas.
Check for adhesion of dust, oil mist, etc.
Equipment in General Check for abnormal vibration and noise.
Power Supply Voltage
Check the power supply voltage for the main circuit and controls. (Check the indication on
the gage of the power supply unit.)
Transformer Check for odor and abnormal noise.
Cooling System
Check the cooling fan for abnormal vibration or noise.
Check the air filter for soiling.
Lamp (Option) Check if any lamp is blown.
Meters (Option) Check if the meter indication is normal.
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