Lenze 8400 BaseLine D - Manual (Page 97)

Lenze · 8400 BaseLine D · Reference manual · DMS 5.5 EN · 01/2014 · TD05
97
5 Motor control (MCTRL)
5.6 Parameterisable additional functions
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
5.6.3 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 C036 .
• 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) ( 98)
 Automatic DC-injection braking (Auto-DCB) ( 98)

Danger!
Holding braking is not possible when this braking mode is used!
Parameter Info Lenze setting
Value Unit
C019 Auto-DCB: Threshold
• Operating threshold for activating DC-injection
braking
3 rpm
C036 DCB: Current
• Braking current in [%] based on I
max
( C022 )
50 %
C106 Auto-DCB: Hold time 0.5 s
C107 DCB: Hold time 999.0 s
C701/4 LA_NCtrl: bSetDCBrake
• Selection of the signal source for activating DC-in-
jection braking
Dependent on the selected
control mode