Electrically Braking The Motor - Siemens SINAMICS G115D Operating Instructions Manual

Advanced commissioning

6.18 Electrically braking the motor

Parameter
p1300[0...n]
p0300[0...n]
...
p0360[0...n]
p1511[0...n]
p1520[0...n]
p1521[0...n]
p1530[0...n]
p1531[0...n]
Additional information about this function is provided in the parameter list and in function
diagrams 6030 onwards in the List Manual.
6.18 Electrically braking the motor
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 converter
functions to control this motor holding brake, see Section Motor holding brake
(Page 179).
• The motor is electrically braked by the converter. 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 converter.
250
Description
Open-loop/closed-loop control
operating mode
Motor data
CI: Supplementary torque 1
CO: Torque limit upper [Nm]
CO: Torque limit lower [Nm]
Motoring power limit [kW]
Regenerative power limit [kW]
Setting
Sets the open and closed-loop control mode of a
drive.
0: U/f control with linear characteristic (factory
setting)
22: Torque control without speed encoder
Motor data is transferred from the motor rating
plate during quick commissioning and calculated
with the motor data identification.
Sets the signal source for supplementary torque
1.
Factory setting: 0
Sets the fixed upper torque limit.
Factory setting: 0
Sets the fixed lower torque limit.
Factory setting: 0
Sets the power limit when motoring.
Factory setting: 0
Sets the regenerative power limit.
Factory setting: -0.01
Operating Instructions, 09/2020, FW V4.7 SP13, A5E48681219B
SINAMICS G115D distributed drive