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5.4.1
POSITION
COMMAND
UNIT
SETTING
(#1557,
#1558,
#1757,
#1758,
#1957,
#1958)(Cont'd)
(3)
Calculation
Expression
of B/A
NUMBER
OF LOAD SHAFT
GEAR TEETH: N_ TABLE
_/WWV_--
] BALL SCREW PITCH: P
"
PULSE GENERATOR
GEAR TEETH: Nm
OUTPUT
PULSE:
fpc
Fig.
5.3
Specifications:
• Ball screw
pitch:
P (mm/rev)
• Deceleration
ratio:
R (where
R = N _/Nm)
• Minimum
position
command:
U (mm/pulse)
• Pulse
generator:
fpG (pulses/rev)
In these
specifications,
B/A
is as follows:
B =
Number
of pulses
of command
side
A
Number
of pulses
of ball screw
side
_
fpcx4
...............
Expression
(_)
P
× 1
U
R
(4) Examples
of Position
Command
Unit
Parameter
Setting
(a)
First,
select
a detector.
Select
a pulse
generator
so that
the motor
shaft
pulse
generator
generates
a quarter
pulse
or more
when
the machine
moves
by the minimum
detection
unit distance.
If pro
er selection
of
ulse output
and deceleration
ratio
er revolution
results
in B/A
=
A/B
_
need for an
conversion.
(b)
After
detector
determination,
find B/A
according
to expression
@. Find A/B
by
calculating
the reciprocal
of B/A.
(c) Find
the parameter
setup
value from
the numeric
values
of B/A
and A/B.
Discard
the
fractions
and
set the integer
part
in the parameter.
92
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