Siemens 440 operating instructions P1511=, CI Supplementary torque setpoint, Frequent settings

6 Commissioning Issue 10/06

Supplementary torque setpoint

¾In the vector mode – with / without encoder – the speed controller can be subordinate to a constant or variable supplementary torque.

¾The supplementary setpoint can be used to advantage for hoisting gear with low intrinsic friction when starting in the vertical direction. The supplementary torque setpoint must always be impressed in the hoisting (raising) direction (please observe the sign!). As a result of the supplementary torque, also when lowering, a slip is immediately established that has a stabilizing effect on the closed-loop control (there is no significant load sag).

¾The sign of the supplementary torque setpoint can be determined as follows in the commissioning phase with the appropriate care and taking into account all of the relevant safety regulations:

Hoist (raise) a minimum load using the hoisting gear and read-out the sign from parameter r0079 (the sign of r0079 corresponds to the sign of the supplementary torque setpoint).

¾An empirical value of approx. 40 % of the rated motor torque r0333 has lead to good results for existing hoisting gear

(carefully observe the sign!).

P1511=...

CI: Supplementary torque setpoint 0:0

Selects the source of the supplementary torque setpoint.

Frequent settings:

2889 Fixed setpoint 1 as a %

2890 Fixed setpoint 2 as a %

755.0Analog input 1

755.1Analog input 2 2015. 2 USS (BOP link)

2018. 2 USS (COM link)

2050. 2 CB (e.g. PROFIBUS)

				Droop
		Pre-			r1518
		control
			Kp	Tn
r1170	–	*)	PI	r1538	r1538
Freq. setpoint			Speed
		–	controller			Torque
		Ti
r0063				r1539	r1539	setpoint
				r1508		r0079
Act. frequency					r1515

CI: Add. trq. setp

P1511.C

(0:0)

		Ti	Kp	Tn
*) only active, if pre-control is enabled	SLVC:	P1452	P1470	P1472
(P1496 > 0)	VC:	P1442	P1460	P1462

54	MICROMASTER 440
	Operating Instructions (Compact)