Siemens 440 operating instructions Dynamic braking, 18.7, Vdc controller

6 Commissioning Issue 10/06

6.4.18.6 Dynamic braking

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)

P1237 = ...

Dynamic braking 0

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.

0Inhibited

1Load duty cycle 5 %

2Load duty cycle 10 %

3Load duty cycle 20 %

4Load duty cycle 50 %

5Load 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
	MM4	B+	B-
~	=	Chopper	=
	~	control	~

6.4.18.7

P1240 =...

P1254 =...

Vdc controller

Configuration of Vdc controller		1	VDC
Enables / disables Vdc controller.			r1242
0	Vdc controller disabled
1	Vdc-max controller enabled
Auto detect Vdc switch-on levels		1	VDC_max -controller active	t
Enables/disables auto-detection of switch-on				A0911
levels for Vdc control functionalities.			r0056 Bit14 1
0	Disabled
1	Enabled		0	t
			⏐f⏐
				fact
				fset
				t

60	MICROMASTER 440
	Operating Instructions (Compact)