C H A N GE PARA METERS
1 1 7
To summ
a
ri
s
e
.
The or
i
entat
i
on funct
i
on
i
s act
i
vated by dropp
i
ng be
l
o w the zero speed thresho
l
d. 2 4 1)M ARKER O FFSE T
i
s
act
i
oned on
l
y once at the commencement of or
i
entat
i
on, and 2 4 2)PO SITIO N REF
i
s then fo
ll
o w ed w
i
th
respect to the 2 4 1)M ARKER O FFSET pos
i
t
i
on. The or
i
entat
i
on funct
i
on
i
s de-act
i
vated by
i
ncreas
i
ng the
speed demand above the zero speed thresho
l
d.
2 4 2)PO SITIO N REF may be changed as many t
i
mes as requ
i
red and the shaft pos
i
t
i
on w
ill
track
i
t re
l
at
i
ve to
the 2 4 1)M ARKER O FFSET pos
i
t
i
on. Each t
i
me 2 4 2)PO SITIO N REF
i
s changed to a ne w va
l
ue, the 2 4 4)IN
PO STIO N FL A G ma y be used to determ
i
ne w hen the ne w pos
i
t
i
on has been ach
i
eved.
The ga
i
n and hence response of the pos
i
t
i
on contro
l
l
oop
i
s set by 1 2 2)ZERO SPEED LO C K. A va
l
ue of zero
w
ill
tu
r
n off
the pos
i
t
i
on
l
oop. The b
l
ock a
l
so prov
i
des 2 4 3)M ARKER FRE Q M O N g
i
v
i
ng marker frequency.
For systems that requ
i
re pos
i
t
i
on
l
ock
i
ng at zero speed but the abso
l
ute pos
i
t
i
on
i
s not
i
mportant, then
1 2 2)ZERO SPEED LO C K on
l
y may be used. In th
i
s case no marker
i
s requ
i
red, and the 2 4 0)M ARKER EN A BLE
i
nput shou
l
d be set to d
i
sab
l
ed.
6.1 0.9. 1 SPINDLE ORIEN T A TE / B
l
ock d
i
agram
6.1 0.9. 1.1
Sp
i
nd
l
e or
i
entate operat
i
on
For a
ll
speeds above 1 1 7)ZERO IN TLK SPD % , the sp
i
nd
l
e or
i
entate contro
l
act
i
on
i
s d
i
sab
l
ed. Ho w ever the
marker frequency mon
i
tor w
ill
funct
i
on w
i
th
i
n
i
ts def
i
ned
li
m
i
ts prov
i
d
i
ng 2 4 0)M ARKER EN A BLE
i
s enab
l
ed.
Not
e
. Th
e
m
a
r
ke
r
th
a
t
i
s us
e
d fo
r
o
ri
e
nt
a
t
i
on
i
s th
e
l
a
st on
e
to b
e
i
nput p
ri
o
r
to th
e
sp
ee
d f
a
lli
ng b
e
l
ow
117
)
ZE
R
O
I
NT
L
K S
P
D % th
r
e
sho
l
d.
( Th
i
s
i
s norma
ll
y w
i
th
i
n 1 revo
l
ut
i
on of the shaft pr
i
or to the thresho
l
d).
W hen the speed fa
ll
s be
l
o w 1 1 7)ZERO IN TLK SPD % , then the sp
i
nd
l
e or
i
entate funct
i
on w
ill
operate
prov
i
d
i
ng 1 2 2)ZERO SPEED LO C K
i
s set to a non-zero va
l
ue and 2 4 0)M ARKER EN A BLE
i
s enab
l
ed. Once the
b
l
ock has commenced funct
i
on
i
ng,
i
t w
ill
cont
i
nue as
l
ong as the speed demand
i
s be
l
o w 1 1 7)ZERO IN TLK
SPD % . The actua
l
speed may exceed 1 1 7)ZERO IN TLK SPD % w
i
thout turn
i
ng the b
l
ock off.
The sequence of operat
i
on
i
s as fo
ll
o w s.
1) Speed demand and feedback fa
ll
and rema
i
n be
l
o w 1 1 7)ZERO IN TLK SPD % for 4 0 0 mS. (Inc
l
udes
Stopp
i
ng sequences us
i
ng term
i
na
l
s T 3 3 or T 3 2). (*PL mode
l
s can on
l
y or
i
entate w hen stopp
i
ng).
2) Sp
i
nd
l
e or
i
entat
i
on b
l
ock
i
s act
i
vated.
3) The shaft pos
i
t
i
on at the
l
ast marker to be
i
nput pr
i
or to the speed fa
lli
ng be
l
o w 1 1 7)ZERO IN TLK SPD %
i
s ca
l
cu
l
ated by the PL/X .
4) The shaft seeks the 2 4 1)M ARKER O F FSET pos
i
t
i
on.
5) A s the shaft approaches the marker offset pos
i
t
i
on the b
l
ock checks for the 2 4 2)PO SITIO N REF target.
SPINDLE
ORIEN T A TE
PIN 2 4 2
Pos
i
t
i
on
Ref
BIDIREC TIO N AL
PULSE C O UNTER
Shaft pos
i
t
i
on
feedback count
PIN 2 4 4
IN Pos
i
t
i
on
FL A G
PIN
2 4 1
M ARKER
O FFSET
(One shot)
Output
To
pos
i
t
i
on
C ontro
l
l
oop
T 1 5
T 1 5
M ARK
PULSE
Be
l
o w Zero Inter
l
ock
Speed % (PIN 1 1 7)
Thresho
l
d
Term
i
na
l
1 6
FB PULSE B
T 1 6
Term
i
na
l
1 7
FB PULSE A
T 1 7
PIN 2 4 3
Marker
Freq OP
PIN
2 4 0
Marker
Enab
l
e
PIN 1 2 2
ZERO
SPEED
LO C K
Summary of Contents for PLX
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