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MDS-D-SVJ3/SPJ3 Series Instruction Manual

5-2 Adjustment procedures for each control

5-2-6 Spindle C axis adjustment (For lathe system)

(1) Setting the gain

For spindle C axis speed loop gain, SP008 (speed loop gain 2), speed loop gain set 2, which consists of

SP009 (speed loop lead compensation 2), and SP010 (speed loop delay compensation 2), is used.

Thus, SP035 has to be set as follows. For position loop gain, set standard 33 to SP002 (position loop

gain, interpolation mode).

<Related servo parameters>

Set the spindle and interpolation axis.

(2) Gain adjustment and accuracy test during C axis operation

[1] Set the D/A output as follows during stopped in C axis mode (servo ON status) or when executing

cutting feed with G01 F20. Then check the droop fluctuation is within 10°/1000.

Offset is 2.5V.

* Waveform during stopped in C axis (Reference)

* Waveform when executing cutting feed with G01 F20 (Reference)

[2] When satisfactory accuracy is not secured, increase SP008 (VGN2) by 10 increments and adjust

so that the accuracy level meets the standard. Note that the maximum setting value is 150 x [inertia

ratio].

Parameter

Setting value

SP002

SP008

SP005 setting value set in "5-2-1" (Initial setting value: 150)

SP009

1900

SP010

SP035

0200: Speed loop gain set 2 selection (validate bit9)

Parameter

Setting value

SV003

Set the same value as spindle parameter "SP002"

SV004

Set it when using SHG control (when not using, set to "0" )

SV057

Set it when using SHG control (when not using, set to "0" )

Output name

Setting value (Setting parameter: Value)

Magnification (Setting parameter: Value)

CH1 output

Position droop

SP125 : 60

SP127 = 10000 (0.01°/V)

CH2 output

Current command

SP126 : 2

SP128 = 1000 (10%/V)

Ch1: Position droop

Ch2: q axis current command

0.010° or less

Ch1: Position droop

Ch2: q axis current command

0.010° or less