Siemens SINAMICS G130 Engineering Manual page 370

SINAMICS S120
Engineering Information
+ 24 V
Fault output
0 V
Inhibit input
0 V
Connection to the
DC link
Connection of Braking Module and braking resistor with SINAMICS S120 Chassis
The diagram below illustrates the power definitions and specifies the permissible load duty cycles for the Braking
Modules and matching braking resistors. The information is valid for the factory-set response thresholds.
Power definitions and load duty cycles for Braking Modules and braking resistors
How to determine which Braking Modules and braking resistors are required
The process for calculating the continuous power rating of Braking Modules and braking resistors required for a
particular application is explained below.
1. Calculating the mean braking power P
First of all, the mean braking power P
· For periodic load duty cycles with a duration of T ≤ 90 s, it is necessary to determine the mean braking power
P over the whole load duty cycle duration T.
mean
· For periodic load duty cycles with a duration of T > 90 s or for sporadic braking operations, it is necessary to
determine the mean braking power P
period of 90 s must be applied as the time base for calculating the mean value.
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Braking Module
21.6
Fault
21.5
21.4
21.3
Inhibit
21.2
21.1
X21
R1
R2
DCPA
DCNA
mean
needs to be calculated on the basis of the specified load duty cycle.
mean
over the time interval during which the maximum mean value occurs. A
mean
Braking resistor
T1
J
D
T2