Lenze 8400 motec - Manual (Page 150)

5 Motor control (MCTRL)
5.10 Parameterisable additional functions
150 Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05
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5.10.3 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.

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:
Procedure
DC-injection braking can be carried out in two ways with different types of activation:
 Manual DC-injection braking (DCB) ( 151)
 Automatic DC-injection braking (auto DCB) ( 151)

Danger!
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 ". ( 268)
Parameter Info Lenze setting
Value Unit
C00019 Auto-DCB: Threshold
• Operating threshold for activating DC-injection
braking
3 rpm
C00036 DCB: Current
• Braking current in [%] based on rated device
current ( C00098 )
50 %
C00106 Auto-DCB: Hold time 0.5 s
C00107 DCB: Hold time 999.0 s
C00701/4 LA_NCtrl: bSetDCBrake
• Selection of the signal source for activating DC-
injection braking
Dependent on the selected
control mode