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

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 󹪝gure below.
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Figure 8-6 Pmax in Regeneration with respect to Erms
The conditions for enabling this rollback are as follows by priority. The 󹪝rst 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 󹪝eld of the keypad and Drive Tool, and
"REGEN OV" on the debug screen.
Advanced Operating Functions
8.10 Regenerative Braking (six-step)
NXGPro+ Control Manual
Operating Manual, A5E50491925A 249