Siemens MICROMASTER 420 Operating Instructions Manual page 126

3 Functions
WARNING
For compound braking, regenerative braking is superimposed on the DC
braking (braking along a ramp). This means that components of the kinetic
energy of the motor and driven load are converted into thermal energy in the
motor. If this power loss is too high or if the braking operation takes too long,
then this can cause the drive to overheat !
When using compound braking it must be expected that there is a higher level
of noise above the compound braking switch-in threshold.
NOTE
Compound braking is de-activated, if
- flying restart is active, and
- DC braking is active is selected.
The compound switch-in threshold V
V
DC-Comp
a) Auto-detect circuit enabled (P1254 = 1):
-
-
b) Auto-detect function disabled (P1254 = 0):
-
-
-
126
(P1254 = 0) V
DC-Comp
V (P1254 = 1) is automatically calculated when the drive inverter
DC-Comp
runs-up - i.e. after the line supply voltage has been connected
Using the auto-detect function, the V
adapts itself to the line supply voltage at the particular installation
location.
V . 1 13 2 P 0210
DC , Comp
The V threshold is immediately re-calculated after entering P0210
DC-Comp
P0210 must be adapted to the particular installation location
is dependent on P1254
DC-Comp
(P1254 0)
threshold automatically
DC-Comp
MICROMASTER 420
Issue 07/04
Operating Instructions
6SE6400-5AA00-0BP0