Siemens SINAMICS S120 Function Manual page 308
Drive functions
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V/f control (vector control)
6.5 Vdc control
Overvoltage in the DC link
● Typical cause:
The drive is operating in regenerative mode and is supplying too much energy to the DC
link.
● Remedy:
Reduce the regenerative torque to maintain the DC link voltage within permissible limits.
Properties
● V
– This comprises V
– There is a common PID controller. The dynamic factor is used to set V
● V
– With this function, the kinetic energy of the motor is used for buffering the DC link
● V
– This function can be used to control momentary regenerative load without shutdown
– V
Vdc_min control
Figure 6-8
In the event of a power failure, V
undershot. This controls the DC link voltage and maintains it at a constant level. The motor
speed is reduced.
308
control
dc
dc_max
functions can be parameterized independently of one another and activated.
control to a smoother or harder setting independently of each other.
control (kinetic buffering)
dc_min
voltage in the event of a momentary power failure, thereby delaying the drive.
control
dc_max
using "overvoltage in the DC link".
control is only recommended with a supply without active closed-loop control
dc_max
for the DC link and without feedback.
Switching V
dc_min
control and V
control (kinetic buffering). These two
dc_min
control on/off (kinetic buffering)
is activated when the V
dc_min
switch-on level is
dc_min
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
and V
dc_min
dc_max
Drive functions
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