Setting The Reference Point Approach - Siemens SINAMICS G120D Operating Instructions Manual

7.6.7.2

Setting the reference point approach

Description
A reference point approach generally consists of the following three steps:
1. Travel to reference cam.
When it receives a signal, the axis searches in a specified direction for the reference
cam.
2. Travel to zero mark.
After reaching the reference cam, the axis changes the traversing direction and evaluates
the zero mark of the encoder.
3. Travel to reference point.
After the zero mark is reached, the axis traverses to the reference point and synchronizes
the actual position value in the converter with the machine.
Step 1: Travel to reference cam
The converter accelerates the axis in the start direction to the "Approach velocity". Once the
axis has reached the reference cam, in step 2, the converter switches to the reference point
approach.
Reversing cams make sense if the reference cam does not extend up to the end of the
traversing range. After reaching a reversing cam, the converter continues to search for the
reference cam in the opposite direction.
Figure 7-34
Under one of the following conditions, the converter skips the first step and starts with step 2:
● The axis is already at the reference cam.
● There is no reference cam available.
Converter with control units CU250D-2
Operating Instructions, 04/2015, FW V4.7.3, A5E34261542B AB
Step 1: Travel to reference cam
Advanced commissioning
7.6 Basic positioner and position control
187