Name: Siemens SIMATIC S7-300 Module data
Brand: Siemens
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Expert Functions

5.4 Activating a Second Encoder

Connection of the SINAMICS S120 to the Technology CPU

146 Product Information, 09/2011, A5E00480378-04

5.4 Activating a Second Encoder

5.4.1 Using a Second Encoder

Introduction

A second encoder is required, for example, when the position detection does not supply

sufficient accuracy for the motor encoder or must be synchronized to external motions.

Second encoder as actual position value

For some mechanical constructions, the motor encoder cannot be used as an exact actual

position value on the system.

For such a construction, a gearbox with large play or slip is located between the motor and

the drive spindle. The motor encoder in such a case does not supply the actual position

value with sufficient accuracy.

Also the specification or the use of the slip in the parameterization of the axis in the

S7T Config project navigator for the Backlash Compensation parameter in the

"Technology\Axes\Axis_1\Mechanics" directory does not suffice to ensure an exact

position detection.

In such a case, a second encoder is mounted on the drive spindle and defined as

actual position value.

   

① Motor encoder

② Gearbox

③ Drive spindle

④ Motor encoder

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