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TROUBLESHOOTING AND MAINTENANCE
6.6 PREVENTIVE MAINTENANCE
!
DANGER!
Always turn off the mains power supply before touching any electrical component associated to the
inverter.
High voltage may still be present even after disconnecting the power supply. Therefore, wait at least
10 minutes for the complete discharge of the power capacitors.
Always connect the equipment frame to the protection earth (PE) at the suitable connection point.
!
WARNING!
The electronic boards have electrostatic discharge sensitive components.
Do not touch the
components or connectors directly. If needed, first touch the grounded mettalic frame or wear a
ground strap.
Do not perform any withstand voltage test: if needed, consult WEG.
The inverters require low maintenance when properly installed and operated.
presents main procedures
and time intervals for preventive maintenance.
provides recommended periodic inspections to be
performed every 6 months after inverter start-up.
Table 6.3:
Preventive maintenance
Maintenance
Interval
Instructions
Fan replacement
After 50.000 operating hours
(1)
Replacement procedure according to
Figure 6.1
and
Replacement of the AUI board battery
Every 10 years
Refer to
Electrolytic
Capacitors
If the inverter is stored
(not in use):: “reforming”
Every
year,
counted
from
the
manufacturing date stated on the inverter
identification label.
Power inverter with single-phase or three-phase
voltage between 208 and 240 Vac, 50 or 60 Hz,
for at least 1 hour. Then, de-energize and wait at
least 24 hours before using the inverter (energize
again)
Inverter is being used:
Every 10 years
Contact WEG technical support
replace
(1)
The inverters are programmed at the factory for automatic control of the fans ( C1.5.1 = 3), so they only start when the temperature of the
heatsink increases. Therefore, the number of operating hours of the fans will depend on the operating conditions (motor current, output
frequency, temperature of the cooling air etc.). The inverter records in parameter D3.3 the number of hours that the fan remained ON. When
the fan reaches 50,000 hours of operation, the HMI will display alarm A177.
Table 6.4:
Recommended periodic inspections - every 6 months
Component
Problem
Corrective Action
Terminals, connectors
Loose screws
Tighten
Loose connectors
Fans/cooling system
Dirty fans
Cleaning
Abnormal noise
Replace fan. Refer to
and
Blocked fan
Proceed in reverse order to assemble a new fan
Abnormal vibration
Check the fan connection
Dust in the cabinet air filter
Printed circuit boards
Accumulation of dust, oil, humidity, etc
Cleaning
Odor
Replacement
Power
module/power
connections
Accumulation of dust, oil, humidity, etc
Cleaning
Loose connection screws
Tighten
DC Link capacitors (Intermediate
Circuit)
Discoloration/ odor / electrolyte leakage
Replacement
Expanded or broken safety valve
Frame expansion
Power resistors
Discoloration
Replacement
Odor
Heatsink
Dust accumulation
Cleaning
Dirty
90 | CFW900
Summary of Contents for CFW900
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