Dynamic Braking; Vdc Controller - Siemens MICROMASTER 440 Operating Instructions Manual

6 Commissioning
6.4.18.6

Dynamic braking

The following settings should always be made:
The Vdc_max controller de-activated
The compound brake de-activated
Resistor brake activated
Dynamic braking
P1237 = ...
Dynamic braking is activated using parameter P1237 – the nominal (rated) duty cycle as
well as the switch-in duration of the braking resistor are also defined.
0 Inhibited
1 Load duty cycle 5 %
2 Load duty cycle 10 %
3 Load duty cycle 20 %
4 Load duty cycle 50 %
5 Load duty cycle 100 %
Using the dynamic brake, the regenerative feedback energy is transferred to the external
braking resistor using the chopper control (braking chopper); it is converted into thermal
energy (heat) in this resistor. This dynamic braking allows the drive to be braked in a
controlled fashion. This function is not available for sizes FX and GX.
~
6.4.18.7

Vdc controller

P1240 =... Configuration of Vdc controller
Enables / disables Vdc controller.
0 Vdc controller disabled
1 Vdc-max controller enabled
Auto detect Vdc switch-on levels
P1254 =...
Enables/disables auto-detection of switch-on
levels for Vdc control functionalities.
0 Disabled
1 Enabled
60
Chopper resistor
MM4 B+
=
Chopper
control
~
1
1
P1240 = 0 (def.: P1240 = 1)
P1236 = 0 (def.: P1236 = 0)
P1237 > 0 (def.: P1237 = 0)
B-
=
~
V
DC
r1242
V
-controller active
DC_max
1
r0056 Bit14
0
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Operating Instructions (Compact)
Issue 10/06
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MICROMASTER 440