Example Connection Of Braking Module; Braking Resistors - Siemens SINAMICS S120 Manual

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8.40 L61/L62, L64/L65, braking units
8.40.5

Example connection of Braking Module

The connections between the Braking Module and the DC link and control terminal strip -X21
are made in the factory.
The connection between the braking resistor on the Braking Module and R1 / R2 must be
made by the customer.
+24 V
Fault output
0 V
Inhibit input
0 V
Shield
DCPA
Connection at the
DC link
DCNA
Figure 8-50 Example connection of Braking Module
8.40.6

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.
512
Braking Module
X21
21.6
21.5
21.4
21.3
21.2
21.1
Fault
Inhibit
R1
R2
Braking resistor
T1
T2
G_D211_DE_00012a
Cabinet Modules
Manual, 03/2013, A5E03263538A