YASKAWA HV600, Technical Reference

Page: 556 / 794

8.2 Inspection
556 YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
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.
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, 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 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.