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Operation
8.5 Functions
8.5.3.4
Vdc-max closed-loop control
The vdc-max closed-loop control permits (restricted) braking operation of a drive with a diode
supply to the DC link. During braking operation, the machine supplies power back to the DC
link. Due to the configuration, however, a diode supply cannot supply this power back to the
line. The vdc controller controls the supply of power back from the machine to compensate for
losses from the drive system and prevent the DC link voltage from exceeding the maximum
value. This avoids any fault shutdown caused by braking ramps that have been set too short.
The drive stops controlled. The ramp-down times may increase as a result.
Adjustable parameters
Parame‐
ter
p1240
Setting for the controller configuration for the voltage DC link (vdc controller).
Values:
0: Inhib Vdc ctrl
1: Enable vdc-max controller
The vdc-max controller increases the ramp-down times automatically to keep the DC link voltage within
the permissible limits.
Parame‐
ter
p1242
Display of the switch-on level of the vdc-max controller.
Parame‐
ter
p1243
Setting for the dynamic factor of the vdc-max controller.
100% means that the following parameters are used in accordance with their initial settings. The use is
based on a theoretical controller optimization.
● p1250, gain
● p1251, settling time
● p1252, derivative-action time
If subsequent optimization is required, this can be set using the dynamic factor. In this case p1250,
p1251, p1252 parameters are weighted with the dynamic factor p1243.
138
Function
Vdc_controller configuration
Function
Vdc_max_controller switch-on level
Function
Vdc_max_controller dynamic factor
Adjustment range
0 ... 3
Factory setting: 1
Unit
V
Adjustment range
10 ... 200 %
Factory setting: 100 %
SINAMICS SM150 6SL3815-7NP41-0AA1
Operating Instructions Rev.201910281301 EXAMPLE
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