Siemens SINAMICS G110D - Technological Functions; Braking Functions; Braking Functions of the Inverter

Functions
6.9 Technological functions
SINAMICS G110D
130 Operating Instructions, 07/2016, FW V3.63, A5E36768472B AB
6.9
Technological functions
6.9.1
Technological functions
The inverter offers the following technological functions:
● Braking functions
● Automatic restart and flying restart
● Basic process control functions
● Logical and arithmetic functions using function blocks that can be freely interconnected
Please refer to the following sections for detailed descriptions.
6.9.2
Braking functions
6.9.2.1
Braking functions of the Inverter
A differentiation is made between electrically braking and mechanically braking a motor:
● 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.
● 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.
Electrical braking and regenerative energy
● If an induction motor electrically brakes the connected load and the kinetic energy that is
released exceeds the mechanical and electrical losses, then it operates as a generator.
In this case, the motor converts kinetic energy into electrical energy.
● Regenerative braking is not available on the SINAMICS G110D Inverter.
Inverter braking methods
Depending on the particular application and the inverter type, there are different technologies
to handle regenerative energy.
● The regenerative energy is converted into heat in the motor (DC braking)
● The inverter converts the regenerative energy to heat using a braking resistor (dynamic
braking)