Siemens SINAMICS G130 Engineering Manual page 184

SINAMICS G130
Engineering Information
Example:
In the following example, we will calculate the rating of the Braking Module and braking resistor for a 450 kW Power
Module.
Mean braking power
The mean braking power is calculated as follows:
Mean braking power = 150 kW x 20 s / 90 s
P = 4.5 x 33.3 kW
20
Peak power = 0.8 x 150 kW
Result:
The mean braking power is the determining factor in choosing the correct rating of Braking Module and braking
resistor, i.e., a braking unit of ≥ 150 kW must be provided.
The braking unit with 50 kW (P
When the response threshold is reduced, the required braking power P
Mean braking power = 150 kW x 20 s / 90 s
P = 4.5 x 33.3 kW
20
Peak power = 1.06 x 150 kW
Result:
The peak power requirement is the determining factor in choosing the correct rating of Braking Module and braking
resistor, i.e., a braking unit of ≥ 159 kW must be provided.
The braking unit with 50 kW (P
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= 33.3
= 150
= 120
= 200 kW) must be selected.
20
= 33.3
= 150
= 159
= 200 kW) must be selected.
20
kW
kW
kW
is calculated as follows:
20
kW
kW
kW