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

DC link components

4.1

Blocksize

4.1
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 A and B frame sizes are designed as sub-chassis components. If the
PM340 Power Modules of the A or B frame sizes 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 C to F frame sizes should be placed
outside the switchgear cabinet or outside the switchgear room in order to conduct 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

Caution
The surface temperature of the braking resistors may exceed 80 °C.
Equipment Manual AC Drive
Manual, (GH6), 03/2006 Edition, 6SL3097-2AL00-0BP0
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4-1