Siemens SINAMICS S120 Function Manual page 159

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
(p1240 = 5, 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]
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
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
4.15 Vdc control
monitoring function
dc_min
Servo control
159