Siemens SINAMICS G120 Operating Instructions Manual page 175

Low voltage inverters built-in units with cu250s-2 control units and encoder evaluation

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Table of Contents

You can find more information in the parameter list and in function diagram 2251 of the List

With the control enabled, electromagnetic interference on the signal cable can cause the motor

to slowly rotate in one direction in spite of a speed setpoint = 0.

Using an analog input as digital input

An analog input can also be used as digital input.

Converter with the CU250S-2 Control Units

Operating Instructions, 04/2018, FW V4.7 SP10, A5E31759476B AG

Overview of the manuals (Page 519)

Analog inputs dead zone, AI 0 (factory setting: 0)

Analog inputs dead zone, AI 1 (factory setting: 0)

Digital inputs (Page 165)

Advanced commissioning

6.3 Adapt the default setting of the terminal strip

The dead band acts on the zero crossover of

the analog input characteristic. Internally, the

inverter sets its speed setpoint = 0, even if

the signal at the analog input terminals is

slightly positive or negative. This prevents

the inverter from rotating the motor at a

speed setpoint = 0.