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2.5
Sequence
Proceed as follows when for adjustment by entering the reference point value :
(1) Set the referencing mode to "Assume the reference point value" ;
MD34200 $MA_ENC_REFP_MODE = 0
(2) Move the machine axis in JOG mode to the position enabled to be measured (e.g.,with
a laser interferometer) or to a known position (e.g.,fixed stop)
Note
The machine axis can only be traversed in the direction enabled for referencing with the
travel keys :
MD34010 $MA_REFP_CAM_IS_MINUS (approach reference point in minus direction)
To avoid an invalid position because of backlash in the drive train, the known position
must be approached at low velocity
(3) Initiate NC-RESET to transfer the entered machine data values.
(4) Switch to JOG_REF mode
(5) Operate the travel key used for referencing in step 2. The machine axis does not move
when the traversing key is actuated!
The NC then calculates the reference point offset from the reference point value
signaled by the absolute encoder and the entered reference point value, enters this
reference point offset in machine data element. :
MD34090 $MA_REFP_MOVE_DIST_CORR (reference point offset)
And sets the status of the absolute encoder to " Encoder is adjusted" :
MD34210 $MA_ENC_REFP_STATE = 2
The actual value system of the machine axis is synchronized.
The machine axis is now referenced
(6) Initiate POWER ON reset
134 | Part 4
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