Siemens Sinumerik 840DiE sl - Page 362

01/2007
11.5 Axes and spindles
11-362
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
Initial referencing of the measuring system of a machine axis with absolute
value encoder is performed by calibrating the encoder.
Follow–up referencing of a machine axis is performed automatically during NCK
booting without axis movement. The following conditions must be fulfilled:
S The machine axis measuring system which is active after the NCK has
booted works with the absolute value encoder.
S The absolute encoder is calibrated:
MD34210: ENC_REFP_STATE[n] = 2 (absolute value encoder is calibrated)
To calibrate the the absolute encoder, the actual value of the encoder is
matched with the machine zero once and then enabled.
The SINUMERIK 840D sl supports the following types of calibration:
S Operator–assisted calibration
S Automatic calibration using probe
S Calibration using BERO
The calibration using the probe and BERO is described in:
References: /FB/, Description of Functions, Basic Functions
R1 Reference point approach
Section: Automatic calibration using probe
Calibration with BERO
During operator–assisted calibration, the machine axis of the absolute value
encoder is move to the known machine position (reference position). The posi-
tion value of the reference position is assume by the NCK as the reference point
value.
Recommended procedure
1. Parameterization of referencing mode
S MD34200: $MA_ENC_REFP_MODE[n] = 0
2. Approaching referencing position
Traversing the machine axis to the referencing position in JOG mode.
Approach direction according to machine data:
S MD34010: $MA_REFP_CAM_DIR_IS_MINUS (reference point ap-
proach in minus direction) (0 = positive, 1 = negative approach direction)
Notice
To avoid the actual position of the machine axis being falsified by backlash in
the drive train, reference point approach must be performed at low velocity and
always from the same direction.
3. Assumption of the reference position in the NCK
The reference position is entered in the machine data:
S MD34100: $MA_REFP_SET_POS[n] (reference point value)
Absolute encoders
Follow–up
referencing
Calibration
Operator–assisted
calibration
11 NCK Commissionin
g
with HMI Advanced