Siemens SINAMICS S120 Equipment Manual page 212

Cabinet Modules
5.7 Central Braking Modules
PD, switch-on ratio of the braking resistor
The braking resistor's switch-on ratio (ratio between ON time and OFF time) is set via
potentiometer PD. The setting made is only evaluated when activated via the S3 switch.
The adjustable values for the switch-on ratio at potentiometer PD correspond to the graphic
below. A value of "40%" is used for the default factory setting.
Figure 5-35
212
Setting of the switch-on ratio
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A