Mitsubishi MELDAS MDS-C1 Instruction Manual page 235

4) The stopping position does not change even when the position shift parameter is changed.
Cause
1 Parameter setting The position shift was changed to
values are incorrect 2048 when the gear ratio between the
spindle and encoder was 1:2 (one
encoder rotation at two spindle
rotations).
5) The machine vibrates when stopping.
Cause
1 Parameter setting The gear ratio parameters SP025
values are incorrect (GRA1) to SP032 (GRB4) are
incorrect.
2 The orientation The vibration frequency is several Hz. Decrease the position loop gain
adjustment is faulty
The vibration frequency is 10Hz or
more.
6) The orientation complete signal is not output
Cause
1 The machine's load is The in-position parameter SP004
heavy (OINP) is too small.
State is improved if delay
compensation control is stopped
during orientation stopping.
(State is improved when changed to
PI control).
2 Carry out the items for 1) Orientation does not take place (motor keeps rotating).
5. Spindle Adjustment
Investigation item
Investigation item
Investigation item
5 - 25
Remedy
If the gear ratio on the left is
established between the spindle
and encoder, the position shift
amount for one spindle rotation is
2048 instead of 4096.
Remedy
Correctly set SP025 (GRA1) to
SP032 (GRB4).
parameters SP001 (PGM) and
SP002 (PGE).
Increase the current loop gain for
orientation parameters SP105
(IQGO) and SP106 (IDGO).
Decrease the speed loop gain for
orientation parameters SP098
(VGOP) and SP099 (VGOI).
Decrease the current loop gain for
orientation parameters SP105
(IQGO) and SP106 (IDGO).
Remedy
Review the in-position range, and
increase SP004 (OINP).
Review the values set for the
speed loop gain for orientation
parameters SP098 (VGOP),
SP099 (VGOI) and SP100
(VGOD).
Remarks
Remarks
Remarks