Siemens SINUMERIK 808D ADVANCED Commissioning Manual page 127

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 30)".
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 30)".
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 121)".
For more information about the connection of the STO terminals, see Section "Connecting the 24 V power supply/STO -
•
X6 (Page 114)".
Commissioning Manual
01/2017
127