Siemens Sinamics G120 Function Manual page 153

Procedure with Startdrive
To set the encoderless actual value sensing, proceed as follows:
1. Press the "Actual value sensing" button.
2. Select the "Configuration actual value sensing" button.
Set the following:
– (A) Actual value tolerance:
– (B), (C), (D) Gearbox ratio:
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Function Manual, 01/2017, FW V4.7 SP6, A5E34261271B AD
In most cases you do not have to change this value. If, in operation, the inverter issues
message C01711 or C30711 (fault value 3 or 44 ... 57), increase this value step-by-step
until the message to longer occurs.
Note: If you increase this value, the speed monitoring of the inverter becomes less
sensitive to limit violations.
Read the number of pole pairs (D) of the motor, and set the data of your machine
according to the following table.
Without gear
Gearbox with speed ratio
load/motor = L/M
Number of load revolutions
Value (B) = 1
Value (B) = L
Commissioning
5.12 Setting extended functions
Number of motor revolutions
Value (C) = number of pole
pairs (D)
Value (C) = M x number of pole
pairs (D)
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