Braking Functions Of The Inverter; Dc Braking - Siemens Sinamics G110M Original Instructions Manual

6. Save your set-
tings.
7. Go online.
The inverter
signals that
offline, other
units and pro-
cess variables
are set than in
the inverter
itself.
8. Accept these
settings in the
converter.
You have changed over the units.
8.9.3

Braking functions of the inverter

A differentiation is made between mechanically braking and electrically braking a motor:
● Mechanical brakes are generally motor holding brakes that are closed when the motor is
at a standstill. Mechanical operating brakes, that are closed while the motor is rotating
are subject to a high wear and are therefore often only used as an emergency brake.
If your motor is equipped with a motor holding brake, then you should use the inverter
functions to control this motor holding brake, see Section Motor holding brake
(Page 222).
● The motor is electrically braked by the inverter. An electrical braking is completely wear-
free. Generally, a motor is switched off at standstill in order to save energy and so that
the motor temperature is not unnecessarily increased.
Braking with the motor in generating mode
If the motor brakes the connected load electrically, it will convert the kinetic energy of the
motor to electrical energy. The electrical energy E released on braking the load is
proportional to the moment of inertia J of the motor and load and to the square of the speed
n. The motor attempts to pass the energy on to the inverter.
8.9.3.1

DC braking

DC braking is used for applications without regenerative feedback into the line supply, where
the motor can be more quickly braked by impressing a DC current than along a braking
ramp.
Typical applications for DC braking include:
● Centrifuges
● Saws
SINAMICS G110M Operating Instructions
Operating Instructions, 04/2015, FW V4.7.3, A5E31298649B AD
8.9 Application-specific functions
Functions
217