Siemens SINAMICS V20 Operating Instructions Manual page 212

Parameter list
7.2 Parameter list
Parameter Function
Note: P1227 = 300.0: function is deactivated
P1227 = 0.0: pulses are locked immediately
If P1217 > P1227, P1227 will take precedence.
P1230[0...2] BI: Enable DC braking
Enables DC braking via a signal applied from an external source. Function remains active while external
input signal is active. DC braking causes the motor to stop rapidly by applying a DC braking current (cur-
rent applied also holds shaft stationary).
When the DC braking signal is applied, the inverter output pulses are blocked and the DC current is not
applied until the motor has been sufficiently demagnetized. This delay time is set in P0347 (demagnetiza-
tion time). If this delay is too short, overcurrent trips can occur. The level of DC braking is set in P1232 (DC
braking current - relative to the rated motor current) which is set to 100 % by default.
Caution: With the DC braking, the kinetic energy of the motor is converted into heat in the motor. The inverter could
overheat if it remains in this status for an excessive period of time!
P1232[0...2] DC braking current [%]
Defines level of DC current relative to rated motor current (P0305). The DC braking can be issued observ-
ing the following dependencies:
OFF1 / OFF3 ==> see P1233
•
BICO ==> see P1230
•
P1233[0...2] Duration of DC braking [s]
Defines duration for which DC braking is active following an OFF1 or OFF3 command.
When an OFF1 or OFF3 command is received by the inverter, the output frequency starts to ramp to 0 Hz.
When the output frequency reaches the value set in P1234, the inverter injects a DC braking current
P1232 for the time duration set in P1233.
Caution: See P1230
Notice: The DC braking function causes the motor to stop rapidly by applying a DC braking current.
When the DC braking signal is applied, the inverter output pulses are blocked and the DC current not ap-
plied until the motor has been sufficiently demagnetized (demagnetization time is calculated automatically
from motor data).
Note: P1233 = 0 means that DC braking is not activated.
P1234[0...2] DC braking start frequen-
cy [Hz]
Sets start frequency for DC braking.
When an OFF1 or OFF3 command is received by the inverter, the output frequency starts to ramp to 0 Hz.
When the output frequency reaches the value set in start frequency of DC braking P1234, the inverter
injects a DC braking current P1232 for the time duration set in P1233.
P1236[0...2] Compound braking cur-
rent [%]
212
Range Factory Can be
default changed
0 - 0 U, T
429496729
5
0 - 250 100 U, T
0.00 - 0.00 U, T
250.00
0.00 - 550.00 U, T
550.00
0 - 250 0 U, T
Scaling Data Data
set type
- CDS U32
- DDS U16
- DDS Float
- DDS Float
- DDS U16
SINAMICS V20 Inverter
Operating Instructions, 09/2014, A5E34559884
Acc.
Level
3
2
2
2
2