Siemens SINAMICS G150, Operating Manual

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11/03 Monitoring, Functions, and Protective Functions
SINAMICS G150
Operating Manual
9-3
9.3 Functions
9.3.1 Vdc-max Controller
Description
The Vdc-max controller enables (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 prevents
potential shutdowns on faults caused by braking ramps that are too short, and the
drive coasts to a standstill in a controlled manner. The ramp-down times may
increase as a result.
Setting Parameters
Setting range: 0 ... 3
p1240
Vdc controller configuration
Factory setting: 1
Setting for the controller configuration for the voltage DC link (Vdc controller)
Values: 0: Disable Vdc controller
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.
r1242
Vdc-max controller switch-on level Unit: V
Display the switch-on level of the Vdc-max controller.
Setting range: 10 ... 200 %
p1243
Vdc-max controller dynamic factor
Factory setting: 100 %
Setting for the dynamic factor of the Vdc-max controller.
100 % means that p1250, p1251, and p1252 (gain, integral time, and derivative time) are used in
accordance with their basic settings based on theoretical controller optimization.
The dynamic factor can be used if subsequent optimization is required, whereby p1250, p1251, and
p1252 are evaluated with dynamic factor p1243.
Setting range: 0.00 ... 10.00
p1250
Vdc controller proportional gain
Factory setting: 1.00
Setting for the proportional gain of the Vdc-max controller.
The effective proportional gain can be determined using p1243.