Siemens SINAMICS S120 Function Manual page 168

Servo control
4.15 Vdc control
V monitoring
dc controller
In the event of a power failure, the Line Module can no longer supply the DC link voltage,
particularly if the Motor Modules in the DC link line-up are drawing active power. To ensure
that the DC link voltage is not burdened with uncritical drives in the event of a power failure,
these drives can be switched off by a fault (F30003) with a parameterizable voltage
threshold (p1248). This is carried out by activating the V
6).
In the event of a power failure, the DC link voltage can increase until it reaches the shutdown
threshold when drives are decelerated. To ensure that the DC link voltage is not loaded with
uncritical drives in the event of a power failure, these drives can be switched off with fault
F30002 with a parameterizable voltage threshold in p1244. This is done by activating the
V
dc_max
Function diagrams (see SINAMICS S120/S150 List Manual)
• 5300
• 5650
Overview of important parameters (see SINAMICS S120/S150 List Manual)
• r0056.14
• r0056.15
• p1240[0...n]
• p1244[0...n]
• p1248[0...n]
• p1250[0...n]
168
monitoring (p1240 = 4, 6).
Servo control - V/f control for diagnostics
Servo control - Vdc_max controller and Vdc_min controller
CO/BO: Status word, closed-loop control: Vdc_max controller active
CO/BO: Status word, closed-loop control: Vdc_min controller active
Vdc controller or Vdc monitoring configuration
Upper DC link voltage threshold
Lower DC link voltage threshold
Vdc controller proportional gain
monitoring function (p1240 = 5,
dc_min
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions