Schaffner Group
User and Installation Manual
Output filter FN5420 and RWK5420
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6 Filter maintenance
Schaffner output filters described in this manual are equipped with long life components that ensure a
satisfactory function for many years under normal operating conditions. Any operation under extreme
conditions such as over-temperatures, overvoltage situations, polluted environments etc. reduces the
life expectancy. Following maintenance recommendation will help maximizing filter lifetime.
Warnings
:
High voltage potentials are involved in the operation of this product. Always remove line side
power before attempting to perform maintenance and let ample time elapse for the capaci-
tors to discharge to safe levels (<42 V). Residual voltages are to be measured both line to
line and line to earth.
Line side power must be disconnected prior to replacement of any part.
6.1 Maintenance schedule
Table 17 Maintenance schedule
year
1
2
3
4
5
6
7
8
9
10
11
12
check and clean fan(s)
X
X
X
X
X
X
X
X
X
X
X
X
replace fan(s)
X
X
check & tighten el. Connections
1)
X
X
X
X
X
X
X
X
X
X
X
X
check el. values of capacitors
X
X
X
X
X
X
replace power capacitors
X
1)
Only external connections need to be checked.
6.2 Fan
Schaffner output filters are reliable low maintenance products. Many products like power supplies, in-
verters or motor drives utilize fans for forced cooling to minimize size and weight. Schaffner output fil-
ters are designed with a similar temperature management concept and therefore, fans, when present,
may have to be maintained and replaced in certain intervals to sustain the function and value of the
product. Please note that it might be necessary to disconnect and remove the filter to replace the fan,
depending on the filter frame size and the available space around its installation.
Forced cooling devices are needed for the operation of Schaffner output filters up to their nominal rat-
ing. Such cooling devices must be checked and cleaned regularly (if installed) to ensure sufficient air
flow at all times.
Note:
increased audible noise is a typical indicator of a fan that needs maintenance or replacement
also outside of a maintenance schedule.
Before cleaning or replacing the cooling devices, make sure to consult the recommended maintenance
procedures and schedules of the supplier of the cooling device in use.
