Siemens MICROMASTER 440 Operating Instructions Manual page 210

0.12kw-250kw
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3 Functions
NOTE
The switch-on threshold V
on P1254
V
DC chopper
a) Auto-detect circuit enabled (P1254 = 1):
b) Auto-detect function disabled (P1254 = 0):
External braking modules (chopper units) including braking resistor can be used
with all of the sizes, FS FX and FS GX. When engineering the system, the
particular braking module / resistor must be taken into consideration.
WARNING
Braking resistors, which are to be mounted on MICROMASTER 440, must be
designed so that they can tolerate the power dissipated.
If an unsuitable braking resistor is used there is a danger of fire and that the
associated drive inverter will be significantly damaged.
The chopper control, integrated in the drive converter is designed for the
braking resistor value assigned in Catalog DA51.2,
e.g.: MICROMASTER 440
brake resistor
brake resistor value
A brake resistor with a lower resistance value will destroy the drive converter.
In this case, an external braking unit must be used.
When operational, the temperature of braking resistors increases – do not
touch ! Ensure that there is sufficient clearance around the unit and there is
adequate ventilation.
A temperature protection switch must be used to protect the units against
overheating.
210
DC chopper
(P1254 = 0)
V
-
U
(P1254 = 1) is automatically calculated when the drive
DC-Chopper
inverter runs-up - i.e. after the line supply voltage has been
connected.
-
Using the auto-detect function, the U
adapts itself to the line supply voltage at the particular installation
location.
=
-
U
. 1
13
2
DC
,
Chopper
-
The U
threshold is immediately re-calculated after entering
DC-Chopper
P0210
-
P0210 must be adapted to the particular installation location
of the dynamic resistor braking is dependent
(P1254
0).
DC chopper
DC-Chopper
P
0210
6SE6440-2UD23-0BA1
6SE6400-4BD12-0BA0
160 Ω
MICROMASTER 440
Issue 10/06
threshold automatically
Operating Instructions
6SE6400-5AW00-0BP0

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