Siemens SINAMICS G120 Operating Instructions Manual page 186

Low voltage converters chassis devices with cu240b-2 and cu240e-2

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Advanced commissioning

6.3 Adapt the default setting of the terminal strip

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.

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

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

Digital inputs (Page 179)

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.

Converter with the CU240B-2 and CU240E-2 Control Units

Operating Instructions, 01/2017, FW V4.7 SP6, A5E34259001B AD