YASKAWA USAREM-A5A Bulletin page 33

6 . 5 P R O T E C T I V E C I R C U I T
S E RV O PA C K p r o v i d e s f u n t i o n s t o p r o t e c t t h e
b o d y a n d m o t o r f r o m m a l f u n c t i o n s .
(1) D y n a m i c b r a k e f u n c t i o n
S e r v o p a c k i n c o r p o r a t e s a d y n a m i c b r a k e f o r
e m e r g e n c y s t o p . T h i s b r a k e o p e r a t e s w h e n :
• A l a r m ( f a u l t d e t e c t i o n ) o c c u r s .
• S e r v o O N c o m m a n d i s o p e n e d .
Main p o w e r s u p p l y i s t u r n e d O F F .
D u r i n g d e c e l e r a t i o n a t P / N o v e r t r a v e l
(2) T r o u b l e d e t e c t i n g f u n c t i o n s
Table 6 2 T r o u b l e Detecting Functions
Trouble
Overcurrent flow in the main circuit
Overcurrent
(at 1 2 times min inst max current I
Circuit Protector
Circuit protector tripped
Trip
Regenerative circuit not activated in
Regeneration
SERVOPACK
Trouble
• For 200V o n l y 200 to 700W
• For 100V o n l y 100 to 300W
Excessively high DC volatge in the main
circuit
Overvoltage
• For 200V a p p r o x 4 2 0 V
• For 100V a p p r o x 2 2 0 V
Overspeed
Excessively large speed reference input
Low DC voltage in the main circuit after
power ON
Voltage Drop
• For 200V a p p r o x 1 5 0 V
• For 100V a p p r o x 7 5 V
Overload condition of motor and
Overload
SERVOPACK
Element error on the printed circuit
A/D Error
board of SERVOPACK
Wrong wiring of motor circuit or PG
Overrun Prevention
signal line
CPU Error Any error of CPU
(3) O v e r l o a d ( O L ) d e t e c t i o n l e v e l
F i g . 6 . 1 3 s h o w s t h e s e t t i n g o f o v e r l o a d d e t e c t i o n
l e v e l a t 100% r a t e d m o t o r c u r r e n t . F o r r a t e d c u r -
r e n t 200% o r m o r e , t h e h i g h e r t h e m o t o r s p e e d i s ,
t h e q u i c k e r t h e m o t o r r e s p o n c e t o t h e s a m e
o v e r l o a d .
Detection
— 2 6 —
1000
100
°PIRATING
TIME
(s)
10
N-3000 limn
(AT RATED \
SPEED )
0 7100
MOTOR RATED CURRENT (16)
Fig 6 13 O v e r l o a r d Characteristics
(4) S e r v o a l a r m o u t p u t [ A L M + , A L M - ]
I f a n y t r o u b l e d e t e c t i o n c i r c u i t s i n T a b l e 6 . 2
f u n c t i o n s , t h e p o w e r d r i v e c i r c u i t i n
S E RV O PA C K g o e s o f f , 7 - s e g m e n t L E D s i n d i c a t e
the o p e r a t i o n c o n d i t i o n a n d a s e r v o a l a r m s i g n a l
is o u t p u t .
The a l a r m c o d e s a r e a l s o o u t p u t t o t h e e x -
t e r n a l t h r o u g h o p e n c o l l e c t o r o u t p u t c i r c u i t s o f
AL01 t o A L 0 3 . S e e Ta b l e 6 . 4 .
(5) P r o t e c t i v e c i r c u i t o p e r a t i o n
An a l a r m s i g n a l i n d i c a t e s s o m e t r o u b l e . C h e c k
the c a u s e a n d c o r r e c t t h e t r o u b l e , a n d r e s t a r t
the o p e r a t i o n . B e f o r e c h e c k i n g t h e c a u s e , t u r n
OFF t h e p o w e r t o t h e m a i n c i r c u i t t o a v o i d d a n -
g e r. A p p l y t h e s e q u e n c e s o t h a t t h e a l a r m s i g -
nal t u r n s OFF o n l y t h e m a i n c i r c u i t ( ® , t
s h o w n i n F i g s . 6 . 1 a n d 6 . 2 . T h i s a l l o w s r a p i d
r e a c t i o n i n t h e e v e n t o f a m a l f u n c t i o h .
I f t h e p o w e r t o t h e c o n t r o l c i r c u i t ( 0 ,
is s i m u l t a n e o u s l y t u r n e d O F F, t h i s a l s o t u r n s
OFF t h e L E D i n t h e S E R V O PA C K i n d i c a t i n g t h e
cause o f t h e a l a r m s i g n a l .
C A U T I O N
When an alarm signal cuts off only the main circuit,
set the speed reference to 0 V before supplying power
to the main circuit to resume the operation
(6) R e s e t t i n g s e r v o a l a r m
To r e s e t t h e s e r v o a l a r m , t u r n O N t h e a l a r m
r e s e t ( A L M - R S T ) s i g n a l o f i n p u t s i g n a l , o r t u r n
OFF t h e c o n t r o l p o w e r s u p p l y o n c e .
I f E r ] o r E i s o n ( S E R V O P A C K i s o v e r
l o a d e d ) , t h e r e s e t a l a r m i s n o t i m m e d i a t e a n d
o c c u r s a f e w m i n u t e s l a t e r .
200 3 0 0
t h e
) , a s