Siemens SINAMICS G220 - Setting Motor Control for Critical Applications

Requirement
The motor is being operated without an encoder.
The pulse technique for continuously estimating the rotor position of a synchronous
reluctance motor is not active.
Description of function
A 0 signal in r1751.0 indicates that at low speeds the closed-loop speed control is in the open-
loop controlled mode. In the open-loop controlled mode, the converter injects a current into the
motor.
Resonance damping is active in the open-loop controlled mode. p1740 de󹪝nes the controller
gain for resonance damping.
Parameters
The following list contains the parameters of the "Resonance damping" function.
Number Name Unit
r0066 Output frequency [Hz]
p1740[0...n] Gain resonance damping for encoderless closed-loop control 
r1751.0...22 Motor model status 
14.10.5.7 Setting motor control for critical applications
Overview
For critical applications, for example, with high load inertia, the speed control can become
unstable.
Requirement
Critical applications arise in the following constellations:
• High load moment of inertia compared with the motor moment of inertia
• Gearbox play or coupling play between the motor and load machine
• Vibrating coupling between the motor and load machine
Functions
14.10Closed-loop drive control
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB 515