Siemens SINUMERIK 828D Series Software And Hardware Service Manual page 177

3. Using a multimeter (set the measuring range to 1000 V DC) at the points DCP/DCN, check
that the DC link voltage is in a no-voltage condition.
Only continue with the work when it has been absolutely ensured that no voltage is present
(a no-voltage condition has been established).
4. Withdraw the red 24 V jumper plug.
5. Release the Torx screws of the DC link.
Software and hardware
Service Manual, 08/2018, 6FC5397-5DP40-6BA1
Service cases - hardware
4.12 Single Motor Modules
177