Dc Link Components; Blocksize; Braking Resistors; Description - Siemens SINAMICS S120 Manual

DC Link Components

4.1

Blocksize

4.1.1

Braking resistors

4.1.1.1

Description

The PM340 Power Modules cannot regenerate into the line supply. For the regenerative
operation, e.g. the braking of a rotating mass, a braking resistor must be connected to
convert the resulting energy into heat.
The braking resistor is connected at terminals DCP/R1 and R2.
The braking resistors can be installed at the side next to the PM340 Power Modules. The
braking resistors for the FSA and FSB frame sizes are designed as sub-chassis
components. If the PM340 Power Modules of the FSA or FSB frame size are operated
without line reactor, the braking resistors can also be installed under the Power Modules.
The braking resistors for the Power Modules of the FSC to FSF frame sizes should be
placed outside the control cabinet or the switchgear room in order to direct the resulting heat
loss away from the Power Modules. This reduces the level of air conditioning required.
A temperature protection switch monitors the braking resistor for overtemperature and issues
a signal on a floating contact if the limit value is exceeded.
4.1.1.2

Safety information

The surface temperature of the braking resistors may exceed 80 °C.
AC Drive
Manual, (GH6), 07/2007 Edition, 6SL3097-2AL00-0BP2
CAUTION
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