YASKAWA USAREM-A5A Bulletin page 31

6 . 4 C O N F I G U R AT I O N O F I / O C I R C U I T
F o r p r o p o r t i o n a l d r i v e , o v e r t r a v e l , s e r v o O N ,
alarm r e s e t , s e r v o a l a r m o u t p u t , c u r r e n t l i m i t
d e t e c t i o n o u t p u t , T G O N , s e r v o r e a d y o u t p u t ,
e t c . , e a c h I / O c i r c u i t i s a n o n c o n t a c t c i r c u i t
i n s u l a t e d w i t h o p t i c a l c o u p l e r s . T h e e x t e r n a l
c i r c u i t , t h e r e f o r e , m u s t b e c o n s t r u c t e d w i t h t h e
s p e c i f i e d v o l t a g e a n d c u r r e n t .
6 4 1 Input Circuit
T h e r e a r e f i v e i n p u t s i g n a l s : S e r v o O N , p r o -
p o r t i o n a l d r i v e r e f e r e n c e , f o r w a r d / r e v e r s e
o v e r t r a v e l p r o t e c t i o n , a l a r m r e s e t . C o n s t r u c t
the i n p u t c i r c u i t u s i n g 2 4 V p o w e r s u p p l y
( F i g . 6 . 8 ) . T y p i c a l c i r c u i t s a r e s h o w n
F i g . 5 . 4 .
The user must provide the 24 V power supply
24VDC ± 1 V, 20mA or more (approx 5mA/circuit)
+24V
OV
Fig 6 8 C o n f i g u r a t i o n o f I/O Circuit
( 1 ) P r o p o r t i o n a l D r i v e R e f e r e n c e [ P - C O N ]
I f a p o s i t i o n l o o p i s n o t s e t f o r p o s i t i o n i n g , a n d
a f t e r c o m p l e t i o n o f p o s i t i o n i n g , h a s b e e n l e f t
f o r q u i t e a l o n g t i m e , t h e p o s i t i o n e d p o i n t m a y
have m o v e d d u e t o p r e a m p l i f i e r d r i f t . T o a v o i d
t h i s , s w i t c h t h e s p e e d a m p l i f i e r f r o m P I d r i v e
t o P d r i v e a f t e r t h e p o s i t i o n i n g a n d t h e l o o p
g a i n i n t h e c o n t r o l s y s t e m s d r o p s a n d t h e d r i f t
d e c r e a s e s . W i t h s e v e r a l p e r c e n t o f f r i c t i o n
l o a d , t h e m o t o r s t o p s c o m p l e t e l y.
(2) F o r w a r d a n d r e v e r s e r u n n i n g p r o h i b i t
[P- O T , N - O T ]
T h e s e c i r c u i t s p r o h i b i t m o t o r d r i v e i n f o r w a r d
r o t a t i o n ( c o u n t e r c l o c k w i s e r o t a t i o n v i e w e d f r o m
the l o a d c o u p l i n g s i d e ) a n d i n r e v e r s e r o t a t i o n .
B y i n p u t t i n g t h e P - O T o r N - O T s i g n a l , t h e
c i r c u i t s t o p s d r i v e o f t h e r o t a t i n g m o t o r a n d
e n e r g i z e s t h e b u i l t - i n d y n a m i c b r a k e t o s t o p t h e
m o t o r. A f t e r s t o p p i n g , t h e m o t o r c a n b e o p e r -
a t e d o n l y i n a r e s e t t i n g d i r e c t i o n . H o w e v e r ,
d r i v e i s n o t p o s s i b l e o n t h e i n s t r u c t i o n t o o p e r -
ate t o t h e O T s i d e .
T
NOTE
OPTICAL
COUPLER
APPROX 5mA
h e P - O T a n d N - O T o p e r a t i o n s p e c i f i c a t i o n
is a s f o l l o w s :
Si d e P Power-
O N TR
Dunng P-OT Base cut off
Dunng N-OT Power on
Note O p e r a t i o n in a reverse direction is possible for both sides P and
N after cutting off the base and releasing DB during DB operation after
P/N-OT
When the overtravel prevention circuit is not used,
connect 1 C N - l j and ® to the 0 V terminal o f the
external 2 4 V power supply
i n
(3) S e r v o O N [ S - O N ]
T h i s c i r c u i t i s u s e d t o t u r n o n t h e m a i n - c i r c u i t
p o w e r - d r i v e c i r c u i t o f t h e S E R V O PA C K . W h e n
t h e s i g n a l o f t h e c i r c u i t i s n o t i n p u t ( S e r v o O F F
s t a t e ) , t h e m o t o r c a n n o t b e d r i v e n . I f t h i s s i g -
nal i s a p p l i e d d u r i n g m o t o r r u n n i n g , t h e m o t o r
w i l l c o a s t t o s t o p .
Before turning power ON or OFF, turn OFF the "Servo-
ON" switch to avoid troubles resulting from transient
current
(4) A l a r m r e s e t [ A L M - R S T ]
T h i s i s t h e i n p u t t o r e s e t a s e r v o a l a r m s t a t e
o t h e r t h a n t h e o v e r c u r r e n t a l a r m ( D i s p l a y 1. ) .
T u r n O F F c o n t r o l p o w e r t e m p o r a r i l y t o r e s e t
t h e s e r v o a l a r m i f a n o v e r c u r r e n t a l a r m
o c c u r s .
6 4 2 O u t p u t Circuit
T h e r e a r e f o u r o u t p u t s i g n a l s : C u r r e n t l i m i t
d e t e c t i o n , T G O N , S e r v o a l a r m , S e r v o r e a d y .
These o u t p u t c i r c u i t s a r e n o n - c o n t a c t , e m -
p l o y i n g t r a n s i s t o r s . V o l t a g e a n d c u r r e n t s p e c i -
f i c a t i o n s a r e :
A p p l i e d V o l t a g e ( V m a x ) g 30 V
C o n d u c t i o n C u r r e n t ( I p ) g 50 m A
The output circuit requires a separate power supply
It i s recommended t o u s e t h e same 2 4 V p o w e r
supply used for the input circuit (Fig. 6. 9)
OUTPUT
RELAY
L:
24 V +-1- -T
FLY-WHE EL DIODE
— 24 —
Si d e N Power- Operable
Direction
ON TR
Power on Side N
Base cut off Side P
NOTE
NOTE
NOTE
Servopack O P T I C A L
COUPLER
ip
TRANSISTOR
Fig 6 9 O u t p u t Circuit
Display
I T
n
1.
• CURRENT
LIMIT OUTPUT
• TG ON
• SERVO
ALARM
• SERVO
READY