Siemens SINAMICS G120 Operating Instructions Manual page 211

Parameterizing compound braking
Table 8- 32
Parameter
P3856
r3859.0
Compound braking converts part of the kinetic energy of the motor and load into motor heat
(temperature rise). The motor can overheat if braking lasts too long or the drive is braked
too frequently.
SINAMICS G120C Inverter
Operating Instructions, 01/2011, FW 4.4, A5E02999804A AB
Parameters to enable and set compound braking
Description
Compound braking current (%)
With the compound braking current, the magnitude of the DC current is defined, which
is additionally generated when stopping the motor for operation with V/f control to
increase the braking effect.
P3856 = 0
Compound braking locked
P3856 = 1 ... 250
Current level of the DC braking current as a % of the rated motor current (P0305)
Recommendation: p3856 < 100 % × (r0209 - r0331) / p0305 / 2
Status word, compound braking
r3859.0 = 1: Compound braking is active
CAUTION
8.9 Application-specific functions
Functions
209