Braking Resistors; Description; Safety Information - Siemens SINAMICS S120 Combi User Manual

DC link components

8.3 Braking resistors

8.3 Braking resistors
8.3.1

Description

A braking resistor is used to dissipate the excess DC link energy in generator operation. One
braking resistor is connected to one Braking Module.
Resistors without thermostatic switch are available with various rated powers.
Mounting
The braking resistors can be mounted standing on the floor of the control cabinet or
suspended. You must ensure that the braking resistors do not obstruct the flow of cooling air
to the drive line-up.
Positioning the braking resistor outside the control cabinet or switchgear room enables the
resulting thermal losses to be routed away. This reduces the level of air conditioning
required.
Connection cables
A shielded connection cable (3 m, 3 x 1.5 mm
1AA00-0DA0.
Other braking resistors are supplied without connecting cable. The maximum conductor
cross-sections are listed in the technical data.
The maximum cable length for all braking resistors is 10 m.
8.3.2

Safety information

The cables to the braking resistor must be installed in such a way that they are inherently
short-circuit and ground-fault-proof.
The braking resistor can become very hot. Consequently, it must be installed so that it
cannot be touched or, if this is not possible, an appropriate warning notice must be
attached to it.
CAUTION
The cooling clearances of 100 mm above and below the components must be observed.
162
DANGER
CAUTION
) is supplied with braking resistor 6SN1113-
2
Manual, Edition 07/2012, 6SL3097-4AV00-0BP3
SINAMICS S120 Combi