Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011 L 203
8400 StateLine C | Reference manual
Motor control (MCTRL)
Parameterisable additional functions
5.9.5 DC-injection braking
DC-injection braking allows the drive to be quickly braked to a standstill without the need
to use an external brake resistor.
The braking current is set in C00036
.
The maximum braking torque to be generated by the DC braking current is approx.
20 ... 30 % of the rated motor torque. It is lower than that for braking in generator mode
with an external brake resistor.
Automatic DC-injection braking (auto DCB) improves the starting performance of the
motor when operated without speed feedback.
Tip!
DC-injection braking has the advantage that it is possible to influence the braking
time by changing the motor current or the braking torque..
Short overview of the relevant parameters:
Method
DC-injection braking can be carried out in two ways with different types of activation:
Manual DC-injection braking (DCB)
( 204)
Automatic DC-injection braking (auto DCB) ( 204)
Danger!
The DC-injection braking or auto DC-injection braking function cannot be used
with sensorless control for synchronous motors (SLPSM).
Holding braking is not possible when this braking mode is used!
• For low-wear control of a holding brake, use the basic function "Holding brake
control". ( 362)
Parameter Info Lenze setting
Value Unit
C00019 Auto-DCB: Threshold
• Operating threshold for activating DC-injection
braking
3rpm
C00036
DC braking: Current
• Braking current in [%] based on rated device
current (C00098
)
50 %
C00106
Auto-DCB: Hold time 0.500 s
C00107
DC braking: Hold time 999.000 s
C00701/4
LA_NCtrl: bSetDCBrake
• Selection of the signal source for activating DC-
injection braking
Dependent on the selected
control mode
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