7.2 Inspection
400 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
7.2 Inspection
Power electronics have limited life and can show changes in performance and deterioration of performance after
years of use in usual conditions. To help prevent these problems, it is important to do preventive maintenance and
regular inspection, and replace parts on the drive.
Drives contain different types of power electronics, for example power transistors, semiconductors, capacitors,
resistors, fans, and relays. The electronics in the drive are necessary for correct motor control.
Follow the inspection lists in this chapter as a part of a regular maintenance program.
Note:
Examine the drive one time each year at a minimum.
The operating conditions, environmental conditions, and use conditions will have an effect on the examination frequency for connected
equipment.
Examine the drive more frequently if you use the drive in bad conditions or in these conditions:
• High ambient temperatures
• Frequent starting and stopping
• Changes in the AC power supply or load
• Too much vibration or shock loading
• Dust, metal dust, salt, sulfuric acid, or chlorine atmospheres
• Unsatisfactory storage conditions.
◆ Recommended Daily Inspection
Table 7.1 gives information about the recommended daily inspection for Yaskawa drives. Examine the items in
Table 7.1 each day to make sure that the components do not wear out or fail. Make a copy of this checklist and put
a check mark in the “Checked” column after each inspection.
Table 7.1 Daily Inspection Checklist
Inspection Area Inspection Points Corrective Action Checked
Motor
Examine for unusual oscillation
or noise coming from the motor.
• Check the load coupling.
• Measure motor vibration.
• Tighten all loose components.
Cooling System
Examine for unusual heat from
the drive or motor and visible
discoloration.
• Check for a load that is too
heavy.
• Tighten loose screws.
• Check for a dirty heatsink or
motor.
• Check the ambient
temperature.
Examine the cooling fans,
circulation fans, and circuit board
cooling fans.
• Check for a clogged or dirty
fan.
• Use the performance life
monitor to check for correct
fan operation.
Surrounding Environment
Make sure that the installation
environment is applicable.
Remove the source of
contamination or correct
unsatisfactory environment.
Load
Make sure that the drive output
current is not more than the
motor or drive rating for an
extended period of time.
• Check for a load that is too
heavy.
• Check the correct motor
parameter settings.
Power Supply Voltage
Examine main power supply and
control voltages.
• Correct the voltage or power
supply to agree with nameplate
specifications.
• Verify all main circuit phases.
◆ Recommended Periodic Inspection
Table 7.2 to Table 7.6 give information about the recommended periodic inspections for Yaskawa drives. Examine
the drive one time each year at a minimum. The operating conditions, environmental conditions, and use
conditions will have an effect on the examination frequency for connected equipment. You must use your
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