Siemens Sinamics S120 Function Manual page 253

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Calculating the external braking resistors

To achieve the highest braking effect, calculate the values of the resistors using the following

Parameter assignment

You can parameterize the Motor Module and the Control Unit using the STARTER

commissioning tool. The expert lists of the drive objects and an input screen form to enter

the digital inputs/outputs are available.

The input screen form of the Control Unit for the digital inputs/outputs DI/DO 8 to 15 is

located under the "Control Unit/bidirectional digital inputs/outputs" window tab.

Terminals 11 and 14 are connected to ground.

The digital inputs/outputs DI/DO 8 to 15 are connected with terminals 9, 10, 12 and 13 at

terminal blocks X122 and X132. Parameters p0728[8...15] are used to define the terminals

as an input or output.

As digital inputs, DI 8 to 15 are interconnected with the parameters p0722[8...15] or with

p0723[8...15] inverted.

The outputs are interconnected with parameters p0738 to p0745.

The outputs can be inverted with p0748[8...15] = 1.

Parameters p0722 to p0748 are Control Unit parameters.

Parameters p123x, r1239 and r0046 are drive parameters.

Example of external armature short-circuit braking

Before parameterizing external armature short-circuit braking, you have created a new

project with a Motor Module and a motor. The following conditions should be fulfilled:

● A short-circuit contactor with an additional feedback signal contact is used. (p1231 = 1).

Drive functions

Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2

= 5.2882 × 10

× p0314 × p0356 × n

= maximum speed used

6.10 Armature short-circuit braking, DC braking

Basic functions

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