Siemens Sinamics G120 Series Parameter Manual page 144

Parameters
List of Parameters
p1230[0...2] BI: Enable DC braking / Enable DC brk.
CU240E Access level: 3
CU240S
Quick comm. NO
CU240S DP
Can be changed: U, T
CU240S DP-F
CU240S PN
PM240
Min
-
Description: 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 (current applied also holds shaft sta-
tionary). 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 (demagnetization 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.
Dependency: When Standard Telegram 350 and PROFIBUS selected (p0700 = 6, p0922 = 350), parameter cannot be changed.
Caution: With the DC braking, the kinetic energy of the motor is converted into heat in the motor.
The drive could overheat if it remains in this status for an exessive period of time !
DC braking is not possible when using a synchronous motor (i.e. P0300 = 2).
p1232[0...2] DC braking current / DC braking current
PM240 Access level: 2
Quick comm. NO
Can be changed: C, U, T
Min
0 [%]
Description: Defines level of DC current in [%] relative to rated motor current (P0305).
The DC braking can be issued observing the following dependencies:
• OFF1 / OFF3 ==> see P1233
• BICO ==> see P1230
p1233[0...2] Duration of DC braking / DC brak. duration
PM240 Access level: 2
Quick comm. NO
Can be changed: C, U, T
Min
0.00 [s]
Description: Defines duration for which DC braking is active following an OFF1 or OFF3 command.
When an OFF1 or OFF3 command is received by the drive, the output frequency starts to ramp to 0 Hz.
When the output frequency reaches the value set in P1234, the drive injects a DC braking current P1232 for the
time duration set in P1233.
Caution: With the DC braking, the kinetic energy of the motor is converted into heat in the motor.
The drive could overheat if it remains in this status for an exessive period of time !
DC braking is not possible when using a synchronous motor (i.e. P0300 = 2).
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 applied 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.
1-144
P-Group: Commands
Active: NO
Max
-
P-Group: -
Active: YES
Max
250 [%]
P-Group: -
Active: YES
Max
250.00 [s]
© Siemens AG 2007 All Rights Reserved
SINAMICS G120 Control Units CU240S, Edition 05/2007
Data type: Unsigned32
Data set: CDS
Factory setting
0
Data type: Unsigned16
Data set: DDS
Factory setting
100 [%]
Data type: Floating Point
Data set: DDS
Factory setting
0.00 [s]