ORET RONIC
™
Tramp Metal Detector
R E C 4 1 0 5
4 - 3
4.3.2 Diagnosing and Correcting Problems
W h e n y o u c a l i b r a t e t h e T M D d u r i n g i n i t i a l s e t u p , t h e mi c r o p r o c es s o r
“ i mp r i n t s ” t h e s i g n al l e v e l p r o d u c e d b y t h e p i e c e o f t r a mp me t a l y o u u s e f o r
t h e c a l ib r ati o n . T h e TM D th e n tri p s w h en t ra mp p ro d u c i n g t h at sig n al l e v el
o r g r e at e r p a s s e s t h r o u g h t h e d e t e c t o r .
H o w e v e r, se t u p an d c al i b r a ti o n we r e d o n e wi t h th e c o n v ey o r b el t s t o p p ed o r
r u n n i n g e m p ty . B e c a u s e b a c k g r o u n d n o i s e c a u s e d b y m a t e r i a l m a y b e
d i f f e r e n t w i t h t h e b el t r u n n i n g l o a d e d , y o u s h o u l d o b s e r v e t h e T M D f o r a d ay
o r t w o b e fo r e ch an g in g th e d ev ic e s e t u p o r c a l i b r at i o n s et t i n g s .
T h e r e a r e tw o b a s i c ty p e s o f p r o b l e ms y o u co u l d b e h av in g w it h th e TM D :
f a l s e t r i p p i n g o r p a s s i n g t r a mp u n d et e c t ed . B o t h o f t h e s e p r o b l ems a r e
c o s t l y . F a l s e t r i p s s t o p t h e c o n v e y o r a n d i n t e r r u pt t h e p r o c e s s f l o w . U n d e -
t e c t e d t r a m p d a ma g e s p r o c e s s ma c h i n e r y .
C o m mo n r ea s o n s fo r fa l s e t r i p p i n g i n c l u d e :
•
C o i l i mb a l a n c e
•
S e n s it iv ity set t oo hi gh
•
I mp r o p er b a r / ro d d et ec t i o n
•
I mp r o p er cl i p (b e lt sp l i c e ) d et e c ti o n
C o m mo n r ea s o n s f o r p a s s i n g t r a mp u n d et e c t ed i n cl u d e :
•
S e n s it iv ity set t oo low
•
T r a mp i s t o o s ma l l
•
C o il d a ma g e
•
D e t e c t o r ma l f u n c t i o n
T h e r e ma i n d e r o f t h i s c h a p t e r d e sc r i b e s t h e d i ag n o s ti c p r o c e s s e s f o r t h e s e
p ro b l e ms a n d o f f e r s su g g e s ti o n s f o r c o r r e c t i n g t h e m.
Summary of Contents for Ramsey ORETRONIC III
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