Switch Actuation and Deactuation
10
Switch Actuation and Deactuation The materials included in this compilation are for the use of Dwyer Instruments, Inc. potential customers and current employees as a resource only. They may not be reproduced, published, or transmitted electronically for commercial purposes. Furthermore, the Company’s name, likeness, product names, and logos, included within these compilations may not be used without specific, written prior permission from Dwyer Instruments, Inc. ©Copyright 2015 Dwyer Instruments, Inc.
-
Upload
dwyer-instruments -
Category
Engineering
-
view
392 -
download
3
Transcript of Switch Actuation and Deactuation
Switch Actuation and Deactuation
T h e m a t e r i a l s i n c l u d e d i n t h i s c o m p i l a t i o n a r e f o r t h e u s e o f D w y e r I n s t r u m e n t s , I n c . p o t e n t i a l c u s t o m e r s a n d c u r r e n t e m p l o y e e s a s a r e s o u r c e o n l y . T h e y m a y n o t b e r e p r o d u c e d , p u b l i s h e d , o r t r a n s m i t t e d e l e c t r o n i c a l l y f o r c o m m e r c i a l p u r p o s e s . F u r t h e r m o r e , t h e C o m p a n y ’ s n a m e , l i k e n e s s ,
p r o d u c t n a m e s , a n d l o g o s , i n c l u d e d w i t h i n t h e s e c o m p i l a t i o n s m a y n o t b e u s e d w i t h o u t s p e c i fi c , w r i t t e n p r i o r p e r m i s s i o n f r o m D w y e r I n s t r u m e n t s , I n c .
© C o p y r i g h t 2 0 1 5 D w y e r I n s t r u m e n t s , I n c .
Switch Actuation/DeactuationO v e r v i e w
D w y e r I n s t r u m e n t s o ff e r s m a n y e l e c t r i c a l s w i t c h p r o d u c t s t h a t m a k e o r b r e a k a c o n t a c t b a s e d o n s e n s i n g a p a r a m e t e r s u c h a s p r e s s u r e , t e m p e r a t u r e , o r l e v e l
O v e r v i e w
M o s t s w i t c h e s a r e s i n g l e p o l e d o u b l e t h r o w , o f t e n r e f e r r e d t o a s S P D T
T h i s t y p e o f s w i t c h h a s o n e n o r m a l l y o p e n c o n t a c t a n d o n e n o r m a l l y c l o s e d c o n t a c t
Switch Actuation/Deactuation
O v e r v i e w
S w i t c h e s c a n a l s o b e d o u b l e p o l e d o u b l e t h r o w , o r D P D T , t h a t h a v e t w o n o r m a l l y o p e n a n d t w o n o r m a l l y c l o s e d c o n t a c t s
S i n g l e p o l e s i n g l e t h r o w s w i t c h e s w i t h j u s t o n e c o n t a c t a r e a l s o a v a i l a b l e a n d a r e s p e c i fi e d t o b e e i t h e r n o r m a l l y o p e n o r n o r m a l l y c l o s e d
Switch Actuation/Deactuation
O v e r v i e w
S w i t c h e s h a v e a s e t p o i n t t h a t i s t h e v a l u e w h e r e t h e c o n t a c t w i l l c h a n g e s t a t e
A l l D w y e r s w i t c h e s w o r k o n a n i n c r e a s e o f v a l u e , s o t h e c o n t a c t w i l l c h a n g e s t a t e a s t h e p a r a m e t e r i n c r e a s e s t o t h e s e t p o i n t
T h e n o r m a l s t a t e o f t h e c o n t a c t , n o r m a l l y o p e n o r n o r m a l l y c l o s e d , i s t h e c o n t a c t s t a t e b e l o w t h e s e t p o i n t
Switch Actuation/Deactuation
O v e r v i e w
O n c e t h e p a r a m e t e r i n c r e a s e s t o t h e s e t p o i n t , t h e s w i t c h a c t u a t e s , a n d t h e c o n t a c t c h a n g e s f r o m t h e n o r m a l s t a t e t o t h e a c t u a t e d s t a t e
A n o r m a l l y c l o s e d c o n t a c t w i l l c h a n g e t o o p e n a n d a n o r m a l l y o p e n c o n t a c t w i l l c h a n g e t o c l o s e d
T h e s w i t c h w i l l s t a y i n t h i s s t a t e a s l o n g a s t h e p a r a m e t e r s t a y s a b o v e t h e d e a d b a n d v a l u e
Switch Actuation/Deactuation
O v e r v i e w
D e a d b a n d , o r d i ff e r e n t i a l , i s t h e v a l u e t h a t a p a r a m e t e r n e e d s t o g o b e y o n d t h e s e t p o i n t t o r e v e r t b a c k t o t h e n o r m a l s t a t e
S w i t c h e s o f t e n h a v e a fi x e d d e a d b a n d t h a t c a n n o t b e c h a n g e d a n d i s l i s t e d i n t h e s p e c i fi c a t i o n s
O r , s w i t c h e s c a n h a v e a d j u s t a b l e d e a d b a n d t h a t c a n b e c h a n g e d o v e r t h e r a n g e o f t h e s w i t c h
Switch Actuation/Deactuation
O v e r v i e w
D i g i t a l s w i t c h e s a n d c o n t r o l l e r s c a n h a v e t h e d e a d b a n d s e t t o a n y v a l u e
Ty p i c a l l y fi x e d d e a d b a n d s a r e u s e d f o r a l a r m a p p l i c a t i o n s a n d a d j u s t a b l e d e a d b a n d s a r e u s e d f o r c o n t r o l a p p l i c a t i o n s
Switch Actuation/Deactuation
O v e r v i e w
A f t e r t h e p a r a m e t e r d e c r e a s e s , t h e s w i t c h d e a c t u a t e s o n c e i t h a s g o n e d o w n p a s t t h e s w i t c h s e t p o i n t a n d d e a d b a n d
O n c e p a s t t h e d e a d b a n d , t h e s w i t c h c o n t a c t s r e s e t a n d r e v e r t b a c k t o t h e n o r m a l s t a t e
Switch Actuation/Deactuation
O v e r v i e w
M o s t s w i t c h e s a u t o m a t i c a l l y r e s e t o n c e p a s t t h e d e a d b a n d b u t t h e r e a r e o p t i o n s f o r s w i t c h e s t h a t w i l l n o t r e v e r t b a c k u n t i l a m a n u a l r e s e t i s p e r f o r m e d
T h i s f e a t u r e i s u s u a l l y u s e d f o r a p p l i c a t i o n s t h a t r e q u i r e a s a f e t y c h e c k t o m a k e s u r e i t i s s a f e t o o p e r a t e i n n o r m a l m o d e a g a i n
Switch Actuation/Deactuation
