6
Troubleshooting and Maintenance
CFW-11 RB | 6-5
Table 6.3: Preventive maintenance
Maintenance Interval Instructions
Fan replacement After 50000 operating hours
(1)
Replacement procedure shown in Figure 6.1 on page 6-6
Keypad battery replacement Every 10 years Refer to Chapter 4 HMI on page 4-1
Electrolytic
capacitors
If the converter
is stocked (not
being used):
“Reforming”
Every year from the manufacturing
date printed in the converter
identification label (refer to Section
2.4 IDENTIFICATION LABELS FOR
THE CFW-11 RB on page 2-9)
Supply the CFW-11 RB (at the +UD and -UD terminal) with a
voltage 250 to 350 Vdc, during 1 hour at least. Then, disconnect
the power supply and wait at least 24 hours before using the
converter (reapply power)
Converter is
being used:
replace
Every 10 years Contact WEG technical support to obtain replacement procedures
(1) The converter are factory set for automatic fan control (P0352=2), which means that they will be turned on only when the heatsink temperature exceeds a
reference value. Therefore, the operating hours of the fan will depend on the converter usage conditions (input current, cooling air temperature, etc.). The
converter stores the number of operating hours of the fan in parameter P0045. When this parameter reaches 50000 operating hours, the keypad display
will show 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 acoustic noise Replace fan. Refer to Figure 6.1 on page 6-6
Check the fan connection
Blocked fan
Abnormal vibration
Dust in the cabinet air filter Cleaning or replacement
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 Discoloration / odor / electrolyte leakage Replacement
Expanded or broken safety valve
Frame expansion
Power resistors Discoloration Replacement
Odor
Heatsink Dust accumulation Cleaning
Dirty
6.5.1 Cleaning Instructions
When it becomes necessary to clean the converter, follow the instructions below:
Ventilation system:
Cut off the converter supply and wait 10 minutes.
Remove the dust accumulated at the ventilation inlets with a plastic brush or a flannel.
Remove the dust accumulated on the heatsink fins and on fan blades using compressed air.
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