Siemens SINAMICS G150, Operating Instructions Manual

Page: 456 / 680

Setpoint channel and closed-loop control
7.4 Vector speed/torque control with/without encoder
Converter cabinet units
456
Operating Instructions, 07/2016, A5E03347396A
Free Kp_n adaptation
•
p1455
Speed controller P gain adaptation signal
•
p1456
Speed controller P gain adaptation lower starting point
•
p1457
Speed controller P gain adaptation upper starting point
•
p1458
Adaptation factor lower
•
p1459
Adaptation factor upper
•
p1466
CI: Speed controller P gain scaling
Speed-dependent Kp_n/Tn_n adaptation (VC only)
• p1460
Speed controller P gain adaptation speed lower
• p1461
Speed controller Kp adaptation speed, upper scaling
• p1462
Speed controller integral time adaptation speed lower
• p1463
Speed controller Tn adaptation speed, upper scaling
• p1464
Speed controller adaptation speed lower
• p1465
Speed controller adaptation speed upper
Dynamic response reduction field weakening (encoderless VC only)
•
p1400.0 Speed control configuration: Automatic Kp/Tn adaptation active
7.4.4.4 Droop function
Description
Droop (enabled via p1492) ensures that the speed setpoint is reduced proportionally as the
load torque increases.
The droop function has a torque limiting effect on a drive that is coupled to a different speed
(e.g. guide roller on a material web). In this way, a very effective load distribution can also be
realized in connection with the torque setpoint of a leading speed-controlled drive. In contrast
to torque control or load distribution with overriding and limitation, with the appropriate
setting, such a load distribution controls even a smooth mechanical connection.
This method is only suitable to a limited extent for drives that are accelerated and braked
with significant changes in speed.
The droop feedback is used, for example, in applications in which two or more motors are
operated with a common shaft and fulfill the above requirements. It limits the torque
differences that can occur as a result of the connection between the motors by modifying the
speeds of the individual motors (drive is relieved when the torque becomes too great).