Siemens SINUMERIK 840Di sl Commissioning Manual page 438

NC Commissioning with HMI Advanced
11.5 Axes and spindles
4. Enabling encoder calibration
5. Activate changed machine data by NC reset.
6. Completing encoder calibration
● MD34090 $MA_REFP_MOVE_DIST_CORR[n] (reference point offset)
● MD34210 $MA_ENC_REFP_STATE[n] = 2
● MD34100 $MA_REFP_SET_POS[n] (reference point value)
Calibrating several absolute encoders
For time-optimized calibration of the absolute encoders of several machine axes, the
following procedure is recommended:
1. Depending on the machine design, move all or several machine axes to their reference
2. Initiate NC reset See above: Point 5.
3. Complete encoder calibration for all machine axes. See above: Point 6.
Recalibration
Recalibration of the absolute encoder is required e.g. after:
● Gear change between load and absolute encoder
● Set actual values (PRESETON)
● Removal/installation of the absolute value encoder
● Removal/installation of the motor with the absolute value encoder
● SRAM data loss of the NC
● Battery failure
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Encoder calibration is performed in the following machine data:
– MD34210 $MA_ENC_REFP_STATE[n] = 1
After the NC booting, the same traverse direction key must be re-actuated as in Point 2,
to complete the encoder calibration in the JOG > REF mode for the machine axis:
– Select JOG > REF mode
– Select machine axis
– Press traverse direction key
Note
Pressing the traverse direction key does not move the machine axis!
The NC then calculates the reference point offset and enters it in the following machine
data:
To indicate that calibration has been completed, the value in the machine data changes
from 1 = enable encoder calibration to 2 = encoder calibrated:
The value from the following machine data is shown as the actual position of the machine
axis on the user interface:
position. See above: Points 1 to 4.
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
Manual