Siemens SINAMICS V20 Operating Instructions Manual page 214

Parameter list
7.2 Parameter list
Parameter Function
Dependency: 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 dependant 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.
P1240[0...2] Configuration of Vdc con-
troller
Enables / disables Vdc controller. The Vdc controller dynamically controls the DC link voltage to prevent
overvoltage trips on high inertia systems.
0
1
2
3
Caution: If P1245 increased too much, it may interfere with the inverter normal operation.
Note:
Vdc_max controller:
•
Vdc_max controller automatically increases ramp-down times to keep the DC-link voltage (r0026) with-
in limits (r1242).
Vdc_min controller:
•
Vdc_min is activated if DC-link voltage falls below the switch on level P1245. The kinetic energy of the
motor is then used to buffer the DC-link voltage, thus causing deceleration of the inverter. If the inverter
trips with F3 immediately, try increasing the dynamic factor P1247 first. If still tripping with F3 try then
increasing the switch on level P1245.
r1242 CO: Switch-on level of
Vdc_max [V]
214
Range Factory Can be
default changed
0 - 3 1 C, T
Vdc controller disabled
Vdc_max controller enabled
Kinetic buffering (Vdc_min controller) enabled
Vdc_max controller and kinetic buffering (KIB) enabled
- - -
Scaling Data Data
set type
- DDS U16
- - Float
SINAMICS V20 Inverter
Operating Instructions, 09/2014, A5E34559884
Acc.
Level
3
3