Lenze 8400 - Manual (Page 274)

5 Motor control (MCTRL)
5.13 Braking operation/brake energy management
274
Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
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The way in which the different braking procedures work is demonstrated schematically in the
following illustration:
[5-30] Graph of the effective speed setpoint and the DC bus voltage during braking

Tip!
Independent of the selected motor control, all procedures given in
C00175 can be used.
The actual speed value can optimally follow the speed setpoint when a brake resistor is
used.
If it is possible to dispense with exact adherence to the deceleration ramp in simple
applications, selection of a braking method without an external brake resistor enables
costs to be reduced due to the avoidance of having to use a brake resistor .
With the "inverter motor brake" function, an effective braking torque of 10 ... 20 % of the
rated motor torque can be achieved.
A combination of all three braking procedures is also possible, e.g. for emergency braking if
the brake resistor fails
( C00175 = "4: Brake resistor + FI_MotBrk + RfgStop").
 Use of the brake resistor ( C00175 = "0: Brake resistor")
 Stopping of the ramp function generator ( C00175 = "1: HlgStop")
 Inverter motor brake ( C00175 = "3: FI_MotBrk + RfgStop)
n
Set
t
n
Set
t
1 2
n
Set
t
0
t t t
U
DC
U
DC
U
DC