Siemens SINUMERIK 828D Service Manual page 118

Service cases - hardware
4.8 Double Motor Modules
9. Using a multimeter (set the measuring range to 1000 V DC) at the points DCP/DCN,
10. Withdraw the red 24 V jumper plug.
11. Release the Torx screws of the DC link.
12. Open the DC link busbars of the two modules.
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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).
Hardware and Software
Service Manual, 03/2010, 6FC5397-5DP20-0BA0