Dc Link Fuses; Parallel Configuration Of Central Braking Modules; Braking Resistor - Siemens SINAMICS G130 Engineering Manual

SINAMICS S120 Cabinet Modules
Engineering Information

DC Link fuses

Every Central Braking Module has a DC link fuse. These are located in the bar between the Braking Unit and the DC
link busbar.

Parallel configuration of Central Braking Modules

In order to increase the required braking power, Central Braking Modules can operate in parallel at a common DC
link. The Braking Units are specially designed in that way that parallel operation is possible with good load
distribution.
The parallel operation of the Braking Modules in the DC link configuration can be done without additional circuitry or
communication between the units. However, the guidelines for positioning within the DC link configuration desribed
on the previous page also apply here. In addition the following has to be taken in account:
•
Every Central Braking Module must be connected to its own braking resistor
•
Only Central Braking Modules of the same power rating can operate in parallel
•
The braking power must be reduced by 10 % due to unsymmetrical load distribution depending on
various system tolerances

Braking resistor

The regenerative energy of the drive configuration is converted into heat by the braking resistor. The braking resistor
is directly connected to the Braking Module. The braking resistor must be installed outside of the cabinet units and
can be located outside of the room where the drive cabinets are installed. Therefore, the resulting heat losses do not
occur near to the drive cabinets which means that the air conditioning costs are reduced. A temperature switch
protects the braking resistor against overheating. The isolated contact of the switch is opened when the temperature
limit is exceeded. The tripping temperature is 120ºC, which corresponds to a surface temperature of the resistor of
approx. 400ºC.
In contrast to the optional Braking Modules, which are mounted inside the Power units (options L61, L62, L64 L65),
the braking resistors for the Central Braking Modules must be ordered separately. The degree of protection is IP21.
The following resistors are available as standard:
Central Braking Module
Order number
Supply voltage 380 V – 480 V 3AC / DC link voltage 500 V – 720 V DC
6SL3700-1AE35-0AA1
6SL3700-1AE41-0AA1
Supply voltage 500 V – 600 V 3AC / DC link voltage 650 V – 900 V DC
6SL3700-1AF35-5AA1
6SL3700-1AF41-1AA1
Supply voltage 660 V – 690 V 3AC / DC link voltage 850 V – 1035 V DC
6SL3700-1AH36-3AA1
6SL3700-1AH41-2AA1
Braking resistor assignment table
The Braking Unit in the Central Braking Module can handle a higher peak braking power than that of the standard
braking resistors.
The power of the braking resistors PBR is harmonized with the braking power P150 of the Central Braking Modules.
This power is, however, only permissible with a reduced load duty cycle duration of 20 minutes.
The braking resistors are dimensioned for occasional regenerative operation. In the case that the braking resistor is
not sufficient to meet the demands of special applications, a suitable braking resistor must be designed individually.
SINAMICS Engineering Manual – May 2008
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© Siemens AG
Braking Corresponding
power P
braking resistor
BR
500 kW 6SL3000-1BE35-0AA0
1000 kW 6SL3000-1BE41-0AA0
550 kW 6SL3000-1BF35-5AA0
1050 kW 6SL3000-1BF41-1BA0
630 kW 6SL3000-1BH36-3AA0
1200 kW 6SL3000-1BH41-2AA0
Dimensions
Width x Depth x Hight
[mm]
960 x 620 x 790
960 x 620 x 1430
960 x 620 x 1110
960 x 620 x 1430
960 x 620 x 1110
960 x 620 x 1430