Dynamic Braking; Advanced Commissioning - Siemens SINAMICS G110M Operating Instructions Manual

Advanced commissioning

6.7 Application-specific functions
DC braking voltages
The line supply voltage available to the Inverter determines the amount of rectified brake
voltage available for DC braking function. Listed in the following table are examples of the
correlation between the input AC voltage to the available DC voltage for the DC braking
function.
Line voltage 380 V AC
Rectified brake 171 V DC
voltage
The following formula can be use a guide to the rectified brake voltage that is available from
the line voltage:
Line voltage x 0.45 = Brake coil voltage
For example: 400 V AC x 0.45 = 180 V DC.
6.7.2.2

Dynamic braking

Typical applications for dynamic braking include:
● Horizontal conveyors
● Vertical and inclined conveyors
● Hoisting gear
For these applications, dynamic motor behavior with different speeds or continuous change
of direction is required.
Principle of operation
Burns when touching a hot braking resistor
A braking resistor reaches high temperatures during operation. Touching the braking
resistor may result in burns.
• Do not touch a braking resistor during operation.
The inverter controls the braking chopper depending on its DC-link voltage. The DC-link
voltage increases as soon as the inverter absorbs the regenerative power when braking the
motor. The braking chopper converts this power into heat in the braking resistor. This
prevents the DC-link voltage from increasing above the limit value U
214
400 V AC
180 V DC
CAUTION
440 V AC 480 V AC
198 V DC 216 V DC
Distributed converter for SIMOGEAR geared motors
Operating Instructions, 06/2016, FW V4.7.6, A5E31298649B AG
500 V AC
225 V DC
.
DC link, max