Braking Resistors - Siemens SINAMICS S120 Manual

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8.32 L61/L62, L64/L65, braking units
8.32.6

Braking resistors

Description
The excess energy of the DC link is dissipated via the braking resistor.
The braking resistor is connected to a Braking Module. The braking resistor is positioned
outside the cabinet or switchgear room. This enables the resulting heat loss around the
Basic Line Module, Smart Line Module, Active Line Module, or Motor Module to be
dissipated, thereby reducing the amount of air conditioning required.
Resistors with a rated power (continuous power) of 25 kW and 50 kW are available.
A thermostatic switch monitors the braking resistor for overtemperature and issues a signal
on a floating contact if the limit value is exceeded.
The thermostatic switch must be evaluated by the Control Unit or a higher-level controller,
and a shutdown must be carried out if necessary.
These braking resistors are not the same as the components described in the "Central
Braking Module" Cabinet Module and must not be connected to this Cabinet Module.
Otherwise, there is a risk of overheating and subsequent damage (such as a fire).
442
WARNING
Cabinet Modules
Manual, (GH5), 05/2010, A5E03263538A