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Troubleshooting and Maintenance
6.4 PREVENTIVE MAINTENANCE
DANGER!
Always disconnect the general power supply before changing any electric
component associated to the inverter.
High voltages can be present even after the disconnection of the power supply.
Wait for at least ten minutes for the full discharge of the power capacitors.
Always connect the frame of the equipment to the protection grounding (PE)
at the proper point for that.
ATTENTION!
The electronic boards have components sensitive to electrostatic discharges.
Do not touch components or connectors directly. If necessary, first touch the
grounded metallic frame or use a proper grounding strap.
Do not execute any applied potential test on the inverter. If necessary, contact
WEG.
When installed in proper environment and operating conditions, the inverters require little service.
Table 6.2 on page 38
lists the main procedures and intervals for routine maintenance.
6.3 on page 38
suggests inspections on the product every 6 months after start-up.
Maintenance
Internal fan replacement
Electrolytic
If the inverter is
capacitors
stocked (not in
use):
"Reforming"
Inverter being
used: replace
Component
Terminals, connectors
Printed circuit boards
Power module/ power
connections
DC bus capacitors
(DC link)
Power resistors
Heatsink
38 | MW500
Table 6.2: Preventive maintenance
Interval
After 40.000 hours of operation
Every year from the manufacturing date
printed on the inverter identification
label (refer to
Section 2.5 RECEIVING
AND STORAGE on page
10)
Every 10 years
Table 6.3: Periodic inspection every 6 months
Abnormality
Loose screws
Loose connectors
Accumulation of dust, oil, humidity, etc. Cleaning
Odor
Accumulation of dust, oil, humidity, etc. Cleaning
Loose connection screws
Discoloration / odor / electrolyte
leakage
Safety valve expanded or broken
Frame expansion
Discoloration
Odor
Accumulation of dust
Dirt
Instructions
Replacement
Apply power to the inverter with voltage
between 380 and 480 Vac, single-phase or
three-phase, 50 or 60 Hz, for at least one hour.
Then, disconnect the power supply and wait
for at least 24 hours before using the inverter
(reapply power)
Contact WEG technical support to obtain
replacement procedure
Corrective Action
Tighten
Replacement
Tightening
Replacement
Replacement
Cleaning
Table
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