Chassis; Braking Modules; Description; Safety Information - Siemens SINAMICS S120 Manual

DC Link Components

4.2 Chassis

4.2 Chassis
4.2.1

Braking Modules

4.2.1.1

Description

A Braking Module (and an external braking resistor) is required in certain cases when the
drive is to be braked or brought to a standstill (e.g. EMERGENCY SWITCHING-OFF
Category 1). The Braking Module contains the power electronics and the associated control.
The supply voltage for the electronics is taken from the DC link.
During operation, the DC link energy is converted to heat loss in an external braking resistor.
A mounting slot is provided in the Power Module.
Design
The Braking Module in chassis format is installed in a slot within the Power Module and
force-cooled by its fan. The Braking Module is connected to the DC link by means of flexible
cables, which are supplied as standard.
The Braking Module has as standard, the following interfaces:
● The DC link is connected through flexible cables
● Connecting terminal for external braking resistor
● 1 digital input (inhibit Braking Module with high signal/acknowledge error with negative
● 1 digital output (Braking Module defective)
4.2.1.2

Safety information

After disconnecting all the supply voltages, a hazardous voltage will be present in all
components for another 5 minutes. Work may not be carried out on the components until
after this time has elapsed.
Before starting work, you should also measure the voltage after the 5 minutes have
elapsed! The voltage can be measured on DC link terminals DCP and DCN.
The DC link discharge voltage hazard warning in the local language must be attached to all
of the components.
126
edge high low)
DANGER
DANGER
Manual, (GH6), 07/2007 Edition, 6SL3097-2AL00-0BP2
AC Drive