Siemens SINAMICS V20 Operating Instructions Manual page 266

Parameter list
8.2 Parameter list
Parameter Function
P1237 Dynamic braking
Dynamic braking absorbs the braking energy in a braking resistor.
This parameter defines the rated duty cycle of the braking resistor.
Dynamic braking is active when the function is enabled and DC-link voltage exceeds the dynamic braking
switch-on level.
Dynamic braking switch-on level (V_DC,Chopper) :
If P1254 = 0 --> V_DC,Chopper = 1.13 * sqrt(2) * V_mains = 1.13 * sqrt(2) * P0210
otherwise V_DC,Chopper = 0.98 * r1242
0
1
2
3
4
5
Note: This parameter is only applicable for converters of frame size D and E. For frame sizes AA to C, the duty
cycle of the braking resistor can be selected with the dynamic braking module (see Appendix "Dynamic
braking module (Page 367)").
Dependen- If dynamic braking is used with DC braking enabled as well as compound braking, DC braking and com-
cy: pound braking will take priority.
Notice: Initially the brake will operate at a high duty cycle dependent on the DC link level until the thermal limit is
approached. The duty cycle specified by this parameter will then be imposed. The resistor should be able to
operate at this level indefinitely without overheating.
The threshold for the warning A535 is equivalent to 10 seconds running at 95 % duty cycle. The duty cycle
will be limited when it was running 12 seconds at 95 % duty cycle.
264
Range Factory
default
0 - 5 0
Disabled
5 % duty cycle
10 % duty cycle
20 % duty cycle
50 % duty cycle
100 % duty cycle
Can be Scaling Data set
changed
U, T - -
Operating Instructions, 10/2019, A5E34559884-012
Data Acc.
type Level
U16 2
SINAMICS V20 Converter