LNC-M600 Leading Numerical Controller Maintenance Manual

LNC-M600
APPENDIX A: PARAMETER ADJUSTMENT EXAMPLE
A2 Parameter Adjustment when Encoder is installed besides Ball Screw
1. Connecting ball screw encoder feedback signal to NC, using it as position control.
2. Connecting motor encoder feedback signal to motor driver, using it as speed
(velocity) and voltage control.
NC
Motor
Ballscrew
Speed
DAC Motor
Interpolation CMR K p
1/GR
Loop
RPM/V Current
1/S
Pulse/screw
um
pulse
V
rpm
motor rpm
ball screw rpm
rev
pulse
3. Since the position feedback signal is returning back from ball screw at this time,
must set gear ratio to 1 even there is gear ratio is between motor and ball screw.
Putting the gear ratio factor into the position control feedback.
4. Assumed the initial parameter # 1112 is to set the encoder total output pulse value
per rotation of motor. At this time, changing it to as the encoder total output pulse
value per rotation of ball screw.
Example:X axis selects 2000rpm/10V motor,encoder total output pulse
value per rotation of motor is 2500; for machine structure, gear ratio is 4, pitch
is 10mm, Please to install an additional 3000pulses/rev encoder on the ball
screw side and also to connect the feedback signal to NC for position control.
Under the condition that V command control method and the system loop gain
is 30, how to set the related parameters
Answer:Parameter #0001:30(system feedback loop gain).
Parameter #0054:4(X axis multiple feedback factor).
Parameter #1112:3000(encoder total output pulse value per rotation of X axis
ball screw).
Parameter #0108:(X axis motor loop gain)
Parameter #0156:3(X axis control commanding mode).
Parameter #0068:1(denominator of X axis motor).
Parameter #0100:1(numerator of X axis ball screw).
Parameter #0104:10000(Pitch of X axis ball screw).
explain later.
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