Siemens SINAMICS S120 - Components at the DC Link; Braking Units

SINAMICS G130
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
296/528
4.9 Components at the DC link
4.9.1 Braking units
SINAMICS G130 converter Chassis units have no regenerative feedback capability. Braking units are therefore
required for applications in which regenerative energy is produced occasionally and for brief periods, e.g. when the
drive brakes (emergency stop). The braking units consist of a Braking Module and an externally installed braking
resistor, which is connected to the Braking Module and converts generated braking energy into heat.
Braking Modules with a continuous braking power of 25 kW (P
20
power 100 kW) and 50 kW (P
20
power 200 kW) are
available for SINAMICS G130 converter Chassis units. The table below lists the braking powers which match the
output power ratings of individual converters. The Braking Modules contain the power electronics and associated
control circuitry. They are designed for being mounted in the power blocks of the G130 Power Modules and are
cooled by the air discharged from the Power Modules. They are connected to the DC link of the Power Module and
operate completely autonomously in terms of the supply voltage drawn from the DC link and in terms of the closed-
loop control. In order to achieve a higher braking power, it is possible to operate more than one Braking Module in
parallel on converters constructed of multiple power blocks. 2 Braking Modules can be used on converters of frame
size HX, and 3 Braking Modules on converters of frame size JX. A separate braking resistor is always assigned to
each Braking Module.
If braking units are operated at ambient temperatures of > 40 °C and at installation altitudes of > 2000 m, the derating
factors relating to output current and output power listed for the Power Modules also apply.
A thermal contact, which can be incorporated into the alarm and shutdown sequence of the converter, is installed in
the braking resistor as a monitoring mechanism.
The maximum permissible cable length between the Braking Module and braking resistor is 100 m.
SINAMICS G130
Chassis units
Rated power
Matching Braking Modules
Braking
resistor
R
B
Max.
current
Rated power
(continuous
braking power)
P
DB
Power
P
40
Power
P
20
Peak power
P
15
380 V – 480 V 3AC
110 kW - 132 kW 25 kW 50 kW 100 kW 125 kW 4.4 Ω ±7.5 % 189 A
160 kW - 560 kW 50 kW 100 kW 200 kW 250 kW 2.2 Ω ±7.5 % 378 A
500 V – 600 V 3AC
110 kW - 560 kW 50 kW 100 kW 200 kW 250 kW 3.4 Ω ±7.5 % 306 A
660 V – 690 V 3AC
75 kW - 132 kW 25 kW 50 kW 100 kW 125 kW 9.8 Ω ±7.5 % 127 A
160 kW - 800 kW 50 kW 100 kW 200 kW 250 kW 4.9 Ω ±7.5 % 255 A
Braking Modules and braking resistors available for SINAMICS G130 Chassis units. The power values are valid for the
factory-set response thresholds
Braking Module
+ 24 V
Fault output
0 V
Inhibit input
0 V
X21
21.6
21.5
21.4
21.3
21.2
21.1
Inhibit
Fault
Connection to the
DC link
DCPA
DCNA
J
D
Braking resistor
T1
T2
R1
R2
Connection of Braking Module and braking resistor in SINAMICS G130 Chassis units