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3. SPECIFICATIONS
MECSEGA
General design
of
positioning system
V
ew
Servo motor
PO
A : Position detection increment (mm/p)
vs
:
n :
L
:
R :
v :
N :
K :
E
:
P O :
P :
(1)
(2)
(3)
Command pulse frequency ( P I S )
Number of pulse generator slits (slits/rev)
Feed screw lead (mm/rev)
Reduction ratio
Moving part speed (mm/s)
Motor speed (rpm)
Position loop gain (sec-')
Deviation counter pulse value
Zero point (pulse)
Address (pulse)
Position detection increment
L
A=-
R x n (mwP>
Command pulse frequency
vs
=
(PIS)
Deviation counter pulse value
v
E
=
- (pulse
VS
K
Expression
( 1 )
indicates the travel per pulse, i.e. the number of output pulses
x A. Using expression (2), calculate the command pulse frequency
from the
work speed and position detection increment. Expression
(3) indicates the
relation between the command pulse frequency and deviation counter pulse
value.
Any of the four positioning units, (mm),
(inch), (degree), and (PULSE), may
be selected individually for the X and Y axes.
According to the target positioning address, a pulse string is output, and
positioning is executed by the AlSD71 by setting data such
as the travel
distance and acceleration/deceleration time per pulse, the positioning speed,
and the positioning address in a positioning command unit.
3-6
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