Efficient Networks S120 manual Vector control Torque control, Closed-loop speed/torque control

Vector control

4.7 Torque control

Kp Tn

			3,
			VSHHG
6SHHGVHWSRLQW		-	FRQWUROOHU
	Ti
6SHHGDFWXDOYDOXH
0BVHW
p1503[C]
	(0)
	S		05HJ
p1501	 0BUHJDFWLYH		1
[FP2520.7]	r1406.12

0BVXSSO

p1511[C]

(0)

r1547[0]

0

1

r1547[1]

r1407.2

r1515

r1538 r0079

7RUTXH

r1539 VHWSRLQW

0BVXSSOVFDO	0BVXSSOVFDO
p1512[C]
	
(0)
	S>'@
0BVXSSO

p1513[C]

(0)

Figure 4-11 Closed-loop speed/torque control

The total of the two torque setpoints is limited in the same way as the speed control torque setpoint. Above the maximum speed (p1082), a speed limiting controller reduces the torque limits in order to prevent the drive from accelerating any further.

True torque control (with self-adjusting speed) is only possible in closed-loop but not open- loop control for sensorless vector control (SLVC). In open-loop control, the torque setpoint adjusts the setpoint speed via a ramp function generator (integration time ~ p1499 x p0341 x p0342). For this reason, sensorless torque control at standstill is only suitable for applications that require an accelerating torque but no load torque (e.g. traction drives). This restriction does not apply to torque control with sensor.

OFF responses

●OFF1 and p1300 = 22, 23

–Reaction as for OFF2

●OFF1, p1501 = "1" signal and p1300 ≠ 22, 23

–No separate braking response; the braking response takes place by a drive that specifies the torque.

–The pulses are suppressed when the brake application time (p1217) expires. Standstill is detected when the actual speed value is less than the speed threshold (p1226) or when the monitoring time (p1227) that started when speed setpoint ≤ speed threshold (p1226) has expired.

–Power-on disable is activated.

130	Drive Functions
	Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4