Siemens SINAMICS V20

Parameter list
8.2 Parameter list
SINAMICS V20 Converter
264 Operating Instructions, 10/2019, A5E34559884-012
Parameter
Function
Range
Factory
default
Can be
changed
Scaling
Data set
Data
type
Acc.
Level
P1237
Dynamic braking
0 - 5
0
U, T
-
-
U16
2
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
Disabled
1
5 % duty cycle
2
10 % duty cycle
3
20 % duty cycle
4
50 % duty cycle
5
100 % duty cycle
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-
cy:
If dynamic braking is used with DC braking enabled as well as compound braking, DC braking and com-
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.