3 dc-injection braking, Dc-injection braking, 5motor control (mctrl) – Lenze 8400 BaseLine D User Manual
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Lenze · 8400 BaseLine D · Reference manual · DMS 5.5 EN · 01/2014 · TD05
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5
Motor control (MCTRL)
5.6
Parameterisable additional functions
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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
.
• 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)
Automatic DC-injection braking (Auto-DCB)
Danger!
Holding braking is not possible when this braking mode is used!
Parameter
Info
Lenze setting
Value Unit
Auto-DCB: Threshold
• Operating threshold for activating DC-injection
braking
3 rpm
DCB: Current
• Braking current in [%] based on I
max
(
)
50 %
Auto-DCB: Hold time
0.5 s
DCB: Hold time
999.0 s
LA_NCtrl: bSetDCBrake
• Selection of the signal source for activating DC-in-
jection braking
Dependent on the selected
control mode