Siemens SINUMERIK 808D ADVANCED Series Commissioning Manual page 110

An external braking resistor can be used to absorb excess regenerative energy in the DC link when the capacity of the
4)
internal braking resistor is insufficient. Note that no internal braking resistor is available in the V70 spindle drive, and you
must select an external braking resistor as specified in Section "Braking resistors (Page 33)".
For V70 spindle drives FSC, circuit breakers are used instead of Type E combination motor controllers.
5)
Connecting the SINAMICS V70 FSD servo system
* No internal braking resistor is available with the V70 spindle drive, and you must select an external braking resistor as
specified in Section "Braking resistors (Page 33)".
Note
The maximum length for all cables must be shorter than 30 m.
•
For more information about the connection of the external braking resistor, see Section "Connecting an external braking
•
resistor (Page 108)".
For more information about the connection of the STO terminals, see Section "Connecting the 24 V power supply/STO -
•
X6 (Page 102)".
110
Commissioning Manual
6FC5397-4EP10-0BA8, 07/2018