Inspection; Recommended Daily Inspection; Recommended Periodic Inspection - YASKAWA GA700 Series Technical Manual

8.2 Inspection

8.2

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 8.1 gives information about the recommended daily inspection for Yaskawa drives. Examine the items in
Table 8.1 each day to make sure that the components do not become unserviceable or fail. Make a copy of this
checklist and put a check mark in the "Checked" column after each inspection.
Inspection Area
Examine for unusual oscillation or noise coming
Motor
from the motor.
Examine for unusual heat from the drive or motor
and visible discoloration.
Cooling System
Examine the cooling fans, circulation fans, and
circuit board cooling fans.
Surrounding Make sure that the installation environment is
Environment applicable.
Make sure that the drive output current is not more
Load than the motor or drive rating for an extended period
of time.
Power Supply
Examine main power supply and control voltages.
Voltage
◆

Recommended Periodic Inspection

Table 8.2 to Table 8.6 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
experience with the application to select the correct inspection frequency for each drive installation. Periodic
inspections will help to prevent performance deterioration and product failure. Make a copy of this checklist and
put a check mark in the "Checked" column after each inspection.
DANGER! Electrical Shock Hazard. Do not examine, connect, or disconnect wiring on an energized drive. Before servicing,
disconnect all power to the equipment and wait for the time specified on the warning label at a minimum. The internal capacitor
stays charged after the drive is de-energized. The charge indicator LED extinguishes when the DC bus voltage decreases
below 50 Vdc. When all indicators are OFF, remove the covers before measuring for dangerous voltages to make sure that the
drive is safe. If you do work on the drive when it is energized, it will cause serious injury or death from electrical shock.
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Table 8.1 Daily Inspection Checklist
Inspection Points Corrective Action
• Check the load coupling.
• Measure motor vibration.
• Tighten all loose components.
• Check for a load that is too heavy.
• Tighten loose screws.
• Check for a dirty heatsink or motor.
• Measure the ambient temperature.
• Check for a clogged or dirty fan.
• Use the performance life monitor to check for correct fan operation.
Remove the source of contamination or correct unsatisfactory environment.
• Check for a load that is too heavy.
• Check the correct motor parameter settings.
• Correct the voltage or power supply to agree with nameplate specifications.
• Verify all main circuit phases.
YASKAWA SIEPC71061705H GA700 Series Technical Manual
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