Siemens Sinamics S110 Function Manual page 161

Description of Vdc_max control without acceleration (p1240 = 7, 9)
As with p1240 = 1, 3, if the drive must not be accelerated by means of an increase in the
supply voltage, acceleration can be prevented by setting p1240 = 7, 9. The effective lower
torque limit must not be greater than the torque limit offset (p1532).
Description of Vdc controller monitoring functions (p1240 = 4, 5, 6)
In the event of a power failure, the supply voltage can increase until it reaches the shutdown
threshold when the drive is decelerated. To ensure that uncritical drives do not attempt to
draw power from the supply voltage in the event of a power failure, such drives can be
switched off by a fault (F07404) with a parameterizable voltage threshold (p1244). This is
carried out by activating the Vdc_max monitoring function (p1240 = 4, 6).
Function diagrams (see SINAMICS S110 List Manual)
● 5650 Vdc_max controller and Vdc_min controller
Overview of important parameters (see SINAMICS S110 List Manual)
Adjustable parameters
● p1240 Vdc controller or Vdc monitoring configuration
● p1244 DC link voltage threshold, upper
● p1248 DC link voltage threshold, lower
● p1250 Vdc controller proportional gain
Display parameters
● r0056.14 Vdc_max controller active
● r0056.15 Vdc_min controller active
Drive functions
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
Drive functions
7.1 Servo control
161