O V ERVIE W
2 - 1 3
2.4.2.2
P
o
l
a
ri
z
a
t
i
on Moto
r
Cont
r
o
l
(P
O
L
a
nd 4th Ax
i
s
)
A three-ax
i
s system uses a S
i
ng
l
e-speed POL A C synchronous stepp
i
ng motor for
feed assemb
l
y rotat
i
on (
P
O
L
). In the four-ax
i
s system a pa
i
r of S
i
ng
l
e-speed POL A C
synchronous stepp
i
ng motors are used for feed assemb
l
y rotat
i
on. Both POL motors
are contro
ll
ed and po w ered from the 7 1 5 0 M C U. Dr
i
ve po w er to the POL motor(s)
i
s s w
i
tched, accord
i
ng to the requ
i
red d
i
rect
i
on of rotat
i
on, by re
l
ays
l
ocated on the
Re
l
ay PCB. A res
i
stance-capac
i
tance (RC) net w ork
i
n the dr
i
ve cab
i
net prov
i
des the
proper phase re
l
at
i
onsh
i
p to each motor.
2.4.2.3
D
ri
v
e
C
a
b
i
n
e
t Cont
r
o
l
L
og
i
c
Motor dr
i
ve commands and
i
nter
l
ock funct
i
ons
i
n the dr
i
ve cab
i
net are performed
w
i
th re
l
ay
l
og
i
c operat
i
ng at + 2 4 V D C, w h
i
ch
i
s der
i
ved from a regu
l
ated po w er
supp
l
y. Commands can be rece
i
ved from the A C U, or PM C U, for motor speed and
d
i
rect
i
on. The
D
ri
v
e
Re
s
e
t
i
s contro
ll
ed from the Re
l
ay PC board and the
Em
e
r
g
e
n
c
y
S
top
i
s
l
ocated on the r
i
ght s
i
de of the enc
l
osure. The dr
i
ve cab
i
net re
l
ay
l
og
i
c then
commands the ax
i
s dr
i
ves accord
i
ng
l
y. L
i
ke w
i
se,
li
m
i
t s w
i
tches mounted on the
structure act
i
vate re
l
ays
i
n the dr
i
ve cab
i
net upon engagement to form ax
i
s
i
nter
l
ocks and prov
i
de the appropr
i
ate fau
l
t report
i
ng to the A C U.
2.4.2.4
L
o
ca
l
Cont
r
o
l
Loca
l
(Ma
i
ntenance) contro
l
of the antenna dr
i
ves
i
s fac
ili
tated through a set of
s w
i
tches on the PM C U
i
n the dr
i
ve cab
i
net. A M AIN T/REM O TE s w
i
tch
l
ocated on
the Re
l
ay PCB a
ll
o w s the operator to se
l
ect bet w een A C U contro
l
and
l
oca
l
dr
i
ve
cab
i
net contro
l
. W
i
th the se
l
ect s w
i
tch set to the M AIN T pos
i
t
i
on, A C U contro
l
i
s
d
i
sab
l
ed; ho w ever, a
ll
status report
i
ng rema
i
ns fu
ll
y operat
i
ona
l
at the A C U.
2.4.2.5
D
ri
v
e
C
a
b
i
n
e
t Ov
e
r
c
u
rr
e
nt
P
r
ot
ec
t
i
on
A s descr
i
bed
i
n paragraph 2.4.2.1, "
i
nte
lli
gent " e
l
ectron
i
c overcurrent protect
i
on
i
s
prov
i
ded for A Z and EL dr
i
ve motors by the var
i
ab
l
e frequency
i
nverters. In add
i
t
i
on,
there are severa
l
other protect
i
on dev
i
ces
i
ntegra
l
to the dr
i
ve cab
i
net. The
i
nverter
i
nputs are
i
nd
i
v
i
dua
ll
y protected by c
i
rcu
i
t breakers essent
i
a
ll
y to offer short-c
i
rcu
i
t
protect
i
on
i
n the event of a dr
i
ve
i
nverter catastroph
i
c fa
il
ure. The + 2 4 V D C
l
og
i
c
po w er supp
l
y
li
ne
i
nput a back pane
l
mounted c
i
rcu
i
t breaker. In three-ax
i
s and
four-ax
i
s systems, the POL motor c
i
rcu
i
t(s) are
i
nd
i
v
i
dua
ll
y protected by a c
i
rcu
i
t
breaker. A ma
i
n
i
nput po w er c
i
rcu
i
t breaker
i
s a
l
so prov
i
ded, w h
i
ch serves as an
i
nterna
l
d
i
sconnect for the ent
i
re cab
i
net.
Summary of Contents for VertexRSI 7200
Page 15: ...INTRODUCTION 1 4 THIS PA GE INTENTIONALLY LEFT BLANK...
Page 21: ...O VERVIEW 2 6 Figure 2 3 7200 A CU Functional Block Diagram...
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Page 46: ...THEORY 3 5...
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