Siemens SINUMERIK 840D sl Function Manual page 429

05.08
Re–calibration procedure
1. Carry out an NCK reset
Warning
!
After the NCK–Reset, the axis can be traversed again. Alarms 27000/C01797
"Axis not safely referenced" are still present and indicate that the functions "safe
limit positions" and "safe cams" are not active in this state. For example, if "safe
limit positions" is being used as a substitute for hardware limit switches, then it is
important to note that at this time, the safe limit positions are not functional!
2. Move the axis to the reference position after first setting MD 34010
REFP_CAM_DIR_IS_MINUS according to the approach direction. (34010
should be set to 1 if the axis is moved in the negative (minus) direction to the
reference position.)
3. MD 34100: Set REFP_SET_POS to the actual value of the reference position.
4. MD 34210: Set ENC_REFP_STATE = 1 to activate the calibration.
5. Select the axis that is to be calibrated on the machine control panel and press
the RESET key on the machine control panel.
6. Select the JOG/REF mode, enable the axis feed.
7. The calibration process must be initiated with traversing key + or – according to
MD 34010: REFP_CAM_DIR_IS_MINUS and the approach direction to the
reference position. (Backlash has been moved through).
8. The axis does not traverse. Instead, the offset between the correct actual
value (reference position) and the actual value – supplied by the encoder – is
entered in MD 34090: REFP_MOVE_DIST_CORR. The actual value appears in
the basic screen and the axis signals "referenced". The value 2 is entered in
MD 34210 as result.
Example:
MD 34010=1 (minus) and the reference position was approached in the nega-
tive (minus) direction. This means that the "–" key must also be pressed on the
machine control panel.
9. When the absolute value encoder has been re–calibrated (MD 34210 from 1 –>
2), the axis changes over into the "referenced" state. At this time, the new valid
actual position is accepted as the safe actual values (axis and drive).
10.Finally, with the JOG/REF machine mode active, on the HMI the "user agree-
ment" softkey must be pressed and the user agreement for the axis involved
must be reset. Alarms 27000/C01797 disappear and the functions "safe limit
position" and "safe cams" are safely active again.
© Siemens AG 2008 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
Commissioning
9.6 Replacing a motor or encoder
9-429