Configuring Resistors - Siemens SINAMICS S120 Function Manual

Basic functions
8.14 Motor Module as a Braking Module
8.14.1

Configuring resistors

Rules and values
Note
Undershooting of the resistance values is not permitted
Under no circumstances may the resistance values for the peak braking power, which are listed
in the following table, be undershot!
Observe the following rules and follow the instructions specified therein:
● The resistance values apply for each of the three resistors in a star connection in the cold
state.
● Each braking resistor absorbs
account the power rating of the resistors.
● For a delta connection, multiply the braking resistance value by a factor of 3.
● The tables apply for all Motor Modules of the "Chassis" format (liquid or air cooling).
● The cable lengths to the resistors must be at least 10 m.
● At rated voltages of 380 V to 480 V, Motor Modules with a type rating ≥ 250 kW are permitted.
● At rated voltages of 500 V to 690 V, all Motor Modules in the "Chassis" format have been
released for use of this function.
You can enter the resistance value in a star connection into parameter p1360. The default
setting of the resistance values is calculated from:
● p1360 = p1362[0] / (√(6) · r0207[0])
● p1362[0] = Braking Module activation threshold according to the following table.
● r0207[0...4] = rated current of the Motor Module
Connecting the braking resistor
Preferably connect the braking resistors in a star configuration
346
/ of the total braking power. It is imperative that you take into
1
3
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Drive functions