YASKAWA LA500, Technical Manual, Page: 206 / 376

8.2 Inspection
206 YASKAWA SIEPYEULA5001C LA500 Technical Manual
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
Examine the items in Table 8.1 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 8.1 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.
• Measure the ambient temperature.
Examine the 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
Examine the items in Table 8.2 to Table 8.6 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, measure 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.