Lenze 8400 TopLine - Manual (Page 267)

Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
267
5 Motor control (MCTRL)
5.10 Parameterisable additional functions
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5.10.5 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.
• The DC-injection braking can be activated manually via a control input of the application or
automatically ("Auto-DCB"). The two different modes are described in the following
subchapters.

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..
The automatic DC-injection braking (Auto-DCB) improves the starting performance of the
motor in case of V/f operation without speed feedback.
Short overview of the relevant parameters:

Note!
The DC-injection braking function (manually or automatically) is only possible for the
following motor control modes:
• V/f characteristic control (VFCplus) ( 157)
• V/f characteristic control - energy-saving (VFCplusEco) ( 176)
• V/f control (VFCplus + encoder) ( 186)
• Sensorless vector control (SLVC) ( 193)

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 ".
( 655)
Parameter Info Lenze setting
Value Unit
C00019 Auto-DCB: Threshold
• Operating threshold for activating DC-injection
braking
3 rpm
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
• When "999.000 s" is set, the hold time is infinite.
999.000 s