Siemens 440 Manuel D’Utilisation

 

MICROMASTER 440 

60 

Operating Instructions (Compact) 

The following settings should always be made: 
¾

  The Vdc_max controller de-activated 

P1240 = 0 

(def.: P1240 = 1) 

¾

  The compound brake de-activated 

P1236 = 0 

(def.: P1236 = 0) 

¾

  Resistor brake activated 

P1237 > 0 

(def.: P1237 = 0) 

 

 

Dynamic braking 
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. 

 

Chopper resistor

Chopper

control

B-

=

~

~

B+

=

~

MM4

 

 

Configuration of Vdc controller 
Enables / disables Vdc controller. 
 0  Vdc controller disabled 
 1  Vdc-max controller enabled 

 

P1254 =... 

Auto detect Vdc switch-on levels 
Enables/disables auto-detection of switch-on 
levels for Vdc control functionalities. 
 0  Disabled 
 1  Enabled 

t

t

⏐f⏐

1

-controller active

V

DC_max

t

V

DC

0

r0056 Bit14

r1242

A0911

f

f

act

set

P1237 = ... 

0

 

1

 

1

 

 

P1240 =...