Regen Braking (Six-Step) Limit Conditions - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

8.10.3

Regen Braking (Six-Step) Limit Conditions

Limit Conditions of Regenerative Braking
The regenerative capability is restricted when the line input voltage gets too high. The rollback
limits the output torque current regenerative capability when input voltage (Erms) reaches or
exceeds 1.08 pu, and decreases it linearly to zero at 1.2 pu as shown in the figure below.
Figure 8-6
The conditions for enabling this rollback are as follows by priority. The first two run the
algorithm, and the third is calculated by the limiting overvoltage algorithm:
• Drive input power negative (drive in regeneration only)
• Drive is running in six-step
• Drive input voltage is at or above 1.08 pu input voltage
• Pre-charge is complete.
When this limit routine is active and its output is being used to limit regenerative torque, the
display will show the limit used as "OVLT" in the mode field of the keypad and Drive Tool, and
"REGEN OV" on the debug screen.
NXGPro+ Control Manual
Operating Manual, A5E50491925A
Pmax in Regeneration with respect to Erms
Advanced Operating Functions
8.10 Regenerative Braking (six-step)
249