Siemens SINAMICS G130 Engineering Manual page 322

SINAMICS G150
Engineering Information
1. The result of the mean braking power calculation is as follows:
P
The braking unit must have a continuous power capability of more than 1.125 • P
P
2a. Checking the required peak power for a factory-set upper response threshold of V
P
90 kW > 5 • 1 • 19.13 kW ?
The condition is not fulfilled, i.e. the required peak power of 90 kW is not higher than the peak power of 96.65 kW
which can be supplied by a braking unit with a continuous power rating of 19.13 kW. The mean braking power is thus
the decisive criterion for selecting the Braking Module and braking resistor
A braking unit with a continuous power rating of
P
is therefore needed. The braking unit with P
therefore suitable for this application.
2b. Checking the required peak power for a reduced lower response threshold of V
k = 0.756:
P
90 kW > 5 • 0.756 • 19.13 kW ?
The condition is fulfilled, i.e. the required peak power of 90 kW is higher than the peak power of 72.3 kW which can
be supplied by the braking unit with a continuous power rating of 19.13 kW. The peak power of the braking unit is
thus the decisive criterion for selecting the Braking Module and braking resistor.
A braking unit with a continuous power rating of
P
is therefore needed. The braking unit with P
therefore suitable for this application.
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Ó Siemens AG
= [ (90 kW • 17 s) + (0 kW • 73 s) ] / 90 s
mean
= 17.0 kW
≥ 1.125 • 17.0 kW
DB
≥ 19.13 kW
> 5 • k • P ?
peak DB
> 96.65 kW ?
≥ 1.125 • P
DB mean
≥ 19.13 kW
= 25 kW or P
DB
> 5 • 0.756 • P ?
peak DB
> 72.3 kW ?
≥ [1 / (5 • k)] • P
DB peak
≥ [1 / (5 • 0.756)] • 90 kW
≥ 23.8 kW
= 25 kW or P
DB
. The following thus applies:
mean
DClink
= 100 kW which can be selected for the cabinet unit is
20
DClink
= 100 kW which can be selected for the cabinet unit is
20
= 774 V according to k = 1
= 673 V according to