Dc-Injection Braking - Lenze 8400 StateLine C Reference Manual

5.9.5

DC-injection braking


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
control".
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:
Parameter
C00019
C00036
C00106
C00107
C00701/4
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)
Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
( 362)
Info
Auto-DCB: Threshold
• Operating threshold for activating DC-injection
braking
DC braking: Current
• Braking current in [%] based on rated device
current (C00098)
Auto-DCB: Hold time
DC braking: Hold time
LA_NCtrl: bSetDCBrake
• Selection of the signal source for activating DC-
injection braking
( 204)
L
8400 StateLine C | Reference manual
Parameterisable additional functions
Dependent on the selected
( 204)
Motor control (MCTRL)
"Holding brake
Lenze setting
Value Unit
3 rpm
50 %
0.500 s
999.000 s
control mode
203