Speed Controller - Siemens MICROMASTER 440 Operating Instructions Manual

3 Functions
3.22.2.3

Speed controller

Parameter range:
Warnings
Faults
Function chart number:
Both of the control techniques (SLVC, VC) have the same speed controller
structure which includes the following components as kernel:
PI controller
Speed controller pre-control
Droop
The sum of the output quantities forms the speed setpoint, which is reduced to the
permissible level using the torque setpoint limiting function (refer to Section
3.22.2.4).
Speed controller (SLVC: P1470, P1472, P1452
The speed controller (refer to Fig. 3-80) receives its setpoint r0062 from the
setpoint channel (refer to Section 3.12), the actual value r0063 either directly from
the speed actual value encoder or, for VC, also directly through the motor model
for SLVC. The system error is amplified by the PI controller and, together with the
pre-control, forms the torque setpoint.
For increasing load torques, when the droop function is active, the speed setpoint
is proportionally reduced so that the load on an individual drive within a group
(where two or several motors are mechanically coupled) is reduced when
excessively high torques occur.
Speed control
r0062
Freq. setpoint
Act. frequency
*) only active if pre-control is activated
(P1496 > 0)
Fig. 3-80
176
P1300, P1400 – P1780
SLVC:
VC:
-
-
FP7500, FP7510
Pre-
control
r1084
–
*)
–
T
i
r0063
Speed controller
P1470, P1472, P1452
P1460, P1462, P1442
VC: P1460, P1462, P1442)
Droop
K
T
p
n
r1538
PI
Speed
controller
r1539
T
i
SLVC: P1452
VC: P1442
MICROMASTER 440
Issue 10/03
r1538
Torque
setpoint
r1539
K T
p n
P1470 P1472
P1460 P1462
Operating Instructions
6SE6400-5AW00-0BP0