Lenze 8400 StateLine - Manual (Page 213)

Lenze · 8400 StateLine · Reference manual · DMS 12.0 EN · 06/2014 · TD05/TD14
213
5 Motor control (MCTRL)
5.9 Parameterisable additional functions
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
C. When the controller is enabled, the motor (still) rotates at a speed which is above the auto DCB
threshold. If the speed setpoint reached via the acceleration ramp exceeds the auto DCB
threshold ( C00019 ), the motor will be energised and the following action will take place:
• During V/f operation without speed feedback, the drive is "caught".  Flying restart function
( 208)
• During V/f operation with speed feedback, the drive synchronises to the current actual speed
value.

Tip!
We recommend to deactivate the auto DCB function during V/f operation with speed
feedback via a setting of C00019 = 0.
Auto DCB function during V/f operation with speed feedback
If you want to use the auto DCB function contrary to our recommendation (see above), the auto DCB
threshold must not fall below the following values depending on the number of encoder
increments:
Setting the auto-DCB function

How to set the automatic DC-injection braking:
1. Set a hold time in C00106 > 0 s.
• Automatic DC-injection braking is active for the time set.
• In case of V/f operation without speed feedback, the braking set in
C00036 is injected.
• After the set hold time has expired, the controller sets pulse inhibit.
2. Set the operating threshold in C00019 .
• The operating threshold can serve to set a dead band in the setpoint. If DC-injection
braking is not to be active then, C00106 must be set to a value of "0".

Stop!
If the DC-injection braking operation is too long and the braking current or braking
voltage is too high, the connected motor may overheat!
Number of encoder increments
( C00420 )
Auto-DCB threshold
( C00019 )
8 16
16 8
32 4
64 2
> 128 No restrictions