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3. Setup
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3-6-4 Spindle end PLG automatic adjustment
Spindle end PLG automatic adjustment is a function that automatically adjusts the gain and offset of the
A and B phase sine wave signals of the spindle end PLG used for C axis control which are input into the
detector converter (MDS-B-PJEX) used in the MDS-C1- SPX/SPHX unit. The adjustment data is saved
in the detector converter, and is used to control the motor the next time the power is turned ON.
Always carry out this adjustment when starting up the spindle system, when the spindle motor has
been replaced, when the PLG has been replaced or readjusted, or when the detector converter has
been replaced. This function is used to improve the accuracy of the position data.
<Adjustment methods>
[1] If SP240 is set to 1, change it to 0, and turn the NC power ON again. If it is already set to 0, go
to step [2].
[2] If the SP240 setting is 0, change it to 1.
[3] Input forward run start. The spindle motor will automatically rotate at the adjustment speed
(two stages for offset adjustment and gain adjustment). (The control input 3/bit8 or bit9 is
changed to 1 after the forward run start input, and "D" is displayed for the drive unit until
automatic adjustment is completed.)
[4] The adjustment results will be calculated and the operation will automatically stop several
seconds after forward run is started. (When automatic adjustment is completed, the drive unit
display at the NC spindle monitor screen changes from "D" to "C". Even though the motor is
stopped while "D" is displayed, automatic adjustment is in progress. Be sure to wait until "C"
displays.)
[5] Turn forward run OFF. (The adjustment data will be saved.)
[6] Turn the NC power ON again.
No. Abbr. Parameter name Details
Setting range
(Unit)
Standard
setting
SP240 EXHS
PLG automatic
adjustment (PJEX)
<For MDS-C1-SPX/SPHX>
This validates the automatic adjustment function for the
PLG connected to the MDS-B-PJEX.
0 to 1
0 → 1
POINT
1. If the NC power is turned ON when SP240 is set to 1, the adjustment data
saved in the detector converter (MDS-B-PJEX) will be used for control.
2. To readjust, or to turn the start OFF during the automatic adjustment when
"D" is displayed for the drive unit (see step [4] above), specify another
SP205=0 setting to restart the NC, then perform the above procedure,
beginning from step [2].
CAUTION
1. The motor will automatically rotate at the adjustment speed during PLG
automatic adjustment. Do not touch the rotating sections as this is
hazardous.
2. Complete PLG adjustment before starting this adjustment.