Siemens 420 manual DC braking, Compound braking, Vdc controller, PID controller

3 Functions Issue 07/04

DC braking

P1232 =...

P1233 =...

DC braking current (entered in %)	100 %
Defines level of DC current in [%] relative to rated motor current (P0305).

Duration of DC braking (entered in s) 0 s

Defines duration for which DC injection braking is to be active following an OFF1 or OFF3 command.

Compound braking

P1236 =...

Compound braking current (entered in %) 0 %

Defines DC level superimposed on AC waveform after exceeding DC-link voltage threshold of compound braking. The value is entered in [%] relative to rated motor current (P0305). (see also 0).

If P1254 = 0 :
Compound braking switch-on level	UDC_Comp = 1.13 ⋅ 2 ⋅ Vmains = 1.13 ⋅ 2 ⋅ P0210
otherwise :
Compound braking switch-on level	UDC_Comp = 0.98 ⋅ r1242

Vdc controller

P1240 =...	Configuration of Vdc controller		1	VDC
	Enables / disables Vdc controller.			r1242
	0	Vdc controller disabled
	1	Vdc-max controller enabled
P1254 =...	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
PID controller

P2200 =...

P2253 =...

P2254 =...

P2257 =...

P2258 =...

P2264 =...

BI: Enable PID controller 0.0

PID mode Allows user to enable/disable the PID controller. Setting to 1 enables the PID controller. Setting 1 automatically disables normal ramp times set in P1120 and P1121 and the normal frequency setpoints

CI: PID setpoint	0.0
Defines setpoint source for PID setpoint input
CI: PID trim source	0.0

Selects trim source for PID setpoint. This signal is multiplied by the trim gain and added to the PID setpoint

Ramp-up time for PID setpoint	1.00 s
Sets the ramp-up time for the PID setpoint
Ramp-down time for PID setpoint	1.00 s
Sets ramp-down time for PID setpoint
CI: PID feedback	755.0
Selects the source of the PID feedback signal.

MICROMASTER 420	Operating Instructions
82	6SE6400-5AA00-0BP0