Catalog PM 21 2013 - Siemens Industry, Inc.

SINAMICS S120 drive system
DC link components
Braking Modules in chassis format
© Siemens AG 2013
3
■ Overview
the DC link power is converted into heat loss in an external
braking resistor. Braking Modules function autonomously. A
number of Braking Modules can be operated in parallel. In this
case, each Braking Module must have its own braking resistor.
Braking Modules are designed to be built into Motor Modules,
Line Modules or Power Modules in chassis format and are
cooled by the fans on these modules. The supply voltage for the
electronics is taken from the DC link. The Braking Modules are
connected to the DC link by means of the busbar sets included
in the scope of supply or flexible cables and, in the case of the
Basic Line Module of frame size GB, by means of a separate
molded cable set (see Accessories).
The activation threshold of the Braking Module can be adjusted
by means of a DIP switch. The braking power values specified
in the technical data apply to the upper activation threshold.
A Braking Module and the matching external braking resistor are
required to bring drives to a controlled standstill in the event of a
power failure (e.g. emergency retraction or EMERGENCY STOP)
or limit the DC link voltage for brief periods of generator operation,
e.g. when the regenerative feedback capability of the Line
Module is deactivated. The Braking Module includes the power
electronics and the associated control circuit. During operation,
■ Design
The Braking Modules in chassis format feature the following
connections and interfaces as standard:
• 1 DC link connection
• 1 braking resistor connection
• 1 digital input (inhibit Braking Module/acknowledge fault)
• 1 digital output (Braking Module inhibited)
• 1 DIP switch for adjusting the activation threshold
■ Integration
Braking Modules in chassis format are designed for mounting in
air-cooled units in chassis format. The fan of the Line Module,
Motor Module or Power Module in which the Braking Module is
mounted also cools the Braking Module. Braking Modules
cannot operate autonomously because they are not equipped
with cooling fans.
Braking Module
X21
+24 V
Fault output
0 V
Inhibit input
0 V
Shield
21.6
21.5
21.4
21.3
21.2
21.1
Fault
Inhibit
R1
Braking resistor
T1
DC link
connection terminals
DCPA
DCNA
R2
G_D211_EN_00012a
T2
Connection example of chassis format Braking Module
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