Siemens SINAMICS G120 Operating Instructions Manual page 317

Setting and enabling compound braking
Parameter
p3856
r3859.0
NOTICE
Overheating of the motor due to compound braking
The motor will overheat if you use compound braking too frequently or for too long. This may
damage the motor.
● Monitor the motor temperature.
● Allow the motor to adequately cool down between braking operations.
● If necessary, select another motor braking method.
Converter with the CU230P-2 Control Units
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE
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 U/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
Compound-braking status word
r3859.0 = 1: Compound braking is active
Advanced commissioning
6.25 Electrically braking the motor
317