Configuring Resistors - Siemens SINAMICS S120 Function Manual

7.13.2

Configuring resistors

Rules and values
● Under no circumstances may the resistance values for the peak braking power, which are
listed in this table, be fallen below!
● The resistance values apply for each of the three resistors in a star connection in the cold
state.
● Each braking resistor absorbs 1/3 of the total braking power. It is imperative that you take
into 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
Table 7- 8 Resistance table 380 - 480 V supply voltage
Motor Rated volt-
Module age
frame size
[V]
G 400
480
H 400
480
H 400
480
H 400
480
J 400
480
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Rated Braking U
DC link
current current chopper
threshold
[A] [A] [V]
490 450 667
490 450 774
605 545 667
605 545 774
745 680 667
745 680 774
840 800 667
840 800 774
985 900 667
985 900 774
7.13 Motor Module as a Braking Module
Continu- Peak Resistance at the
ous brak- braking continuous brak-
ing power power
[kW] [kW]
368 551
427 640
445 668
517 775
555 833
645 967
654 980
758 1138
735 1103
853 1280
Basic functions
Resistance at the
peak braking
ing power power
[Ω] [Ω]
0.605 0.403
0.702 0.466
0.500 0.333
0.580 0.387
0.400 0.267
0.465 0.310
0.340 0.277
0.395 0.263
0.303 0.202
0.351 0.234
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