Maintenance
11.2 Replacing components
SINAMICS DCM DC Converter
698 Operating Instructions, 12/2018, A5E34763375A
Device failure after fuse trips
When a fuse trips, the neighboring arm fuses may also be damaged. Not replacing all fuses
at the same time can cause the device to fail.
• After a fuse trips, always replace all arm fuses at the same time. Always use fuses of
the same type.
– For units > 850 A, as described here, these are the fuses installed in the unit.
For units ≤ 850 A, these are the externally installed fuses.
Replacing fuses for 900 A to 1200 A units
The fuses are accessible from the front after removing the front cover and swiveling the
support plate for the electronics out of the way. The fuses are fixed with 2 hex screws each
① (width across flats 16). Tightening torque 25 Nm.
Figure 11-9 Fuse replacement devices 900 A to 1200 A
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