Siemens SINAMICS S120 Manual page 534

Maintenance and Servicing
10.4 Replacing components
Description
The DC fuses are installed in a fuse insert. To replace the fuses, the fuse insert be removed.
NOTICE
Device failure after a DC fuse trips
The neighboring DC fuses may also become damaged if a DC fuse trips. Failure to replace all
fuses at the same time can cause the device to fail.
• After a DC fuse trips, always replace all DC fuses at the same time. Always use fuses of
the same type.
Preparatory steps
• Disconnect the drive line-up from the power supply
• Allow unimpeded access
• Remove the protective cover
Removal
The removal steps are numbered in accordance with the numbers in the diagram.
1. Release the DC connections at DCP and DCN (four screws each)
2. Remove nuts (eight screws)
3. Remove the retaining screws for the connection plate of the housing (four screws) and
remove the connection plate
4. Remove the retaining screw for the fuse insert (one screw)
You can now remove the fuse insert.
NOTICE
Damage to the device if signal cables or plastic parts become damaged during removal
Signal cables or plastic parts can become damaged when the fuse insert is removed. This
can cause the device to fail.
• When removing the fuse insert, ensure that you do not damage any signal cables or
plastic parts.
You can then replace the DC fuses.
532
Air-cooled chassis power units
Equipment Manual, 06/2020, 6SL3097-5AE00-0BP3