Components At The Dc Link; Braking Units - Siemens SINAMICS G130 Engineering Manual

SINAMICS G130
Engineering Information
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Components at the DC link

Braking units

Braking units are used when regenerative energy occurs occasionally and briefly, for example when the brake is
applied to the drive (emergency stop). Braking units comprise a Braking Module and a braking resistor, which must
be fitted externally.
Braking units with a continuous braking power of 25 kW (P
available for SINAMICS G130 chassis units. Higher braking powers can be obtained for larger converters by
connecting braking units in parallel (on request).
If the braking units are used at ambient temperatures > 40°C and installation altitudes > 2000 m, the derating factors
for current and output power listed for the Power Units also apply here.
A thermal contact, which can be integrated into the converter's alarm and shutdown sequence, is installed in the
braking resistor for monitoring.
SINAMICS G130
chassis units
Rated output
380 V – 480 V 3AC
110 kW - 132 kW
160 kW - 560 kW
500 V – 600 V 3AC
110 kW - 560 kW
660 V – 690 V 3AC
75 kW - 132 kW
160 kW - 800 kW
Braking Modules and braking resistors available for SINAMICS G130 chassis units
How to calculate the required braking units and braking resistors
• For periodic load duty cycles with a cycle duration of ≤ 90 s, the average value of the braking power within this
load duty cycle needs to be calculated. The respective period is used as the time base.
• For periodic load duty cycles with a cycle duration of > 90 s or for sporadic braking operations, a time interval of
90 s in which the highest average value occurs must be selected. The 90 s period must be applied as the time
base.
Apart from the average braking power, the required peak braking power must also be taken into account when
braking units are selected (Braking Module and braking resistors). The diagrams and tables below illustrate the
correlations.
SINAMICS Engineering Manual – May 2008
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© Siemens AG
Matching Braking Modules
Rated power Power
(continuous
braking power)
P P
DB 40
25 kW 50 kW
50 kW 100 kW
50 kW 100 kW
25 kW 50 kW
50 kW 100 kW
power 100 kW) or 50 kW (P
20
Power Peak power
P P
20 15
100 kW 125 kW
200 kW 250 kW
200 kW 250 kW
100 kW 125 kW
200 kW 250 kW
power 200 kW) are
20
Braking Max.
resistor current
R
B
4.4 Ω ±7.5 %
189 A
2.2 Ω ±7.5 %
378 A
3.4 Ω ±7.5 %
306 A
9.8 Ω ±7.5 %
127 A
4.9 Ω ±7.5 %
255 A