Thermo Electron Ramsey ORETRONIC III, Operating And Service Manual

Page: 89 / 143

ORET RONIC
™
Tramp Metal Detector
R E C 4 1 0 5 4 - 2 1
I f y o u r sy st e m u s e s a j u n c t i o n b o x , f o l l o w t h i s p r o c ed u r e t o t e st t h e r e c e i v er
c o i l.
1 . T u rn o ff p o w e r t o th e c o n t ro l u n i t (
S W
6 ) .
2 . D i s c o n n e c t t h e r e c e i v e r c o i l w i re s f r o m t e r m i n a l s 1 2 1 a n d 2 2 2 a t t h e
j u n c t i o n b o x .
3 . M e a s u r e t h e r e s i s t an ce o f t h e co i l .
I f t h e r e s i st a n c e i s g r e a t e r t h an 5 0 0 o h ms , t h e r e c e i v er c o i l i s b ad .
I f t h e r e c e i v e r co i l r e si s t a n c e i s ap p r o x i ma t e l y 4 5 0 – 5 0 0 o h ms , t h e r e c e i v er
c o i l, i t i s w i r in g , an d i t s p o rt io n o f th e
C P U
b o a rd i s all ri g h t.
4 . I f t h e r e c e i v e r co i l r e si s t a n c e i s al l r i g h t , r ec o n n e c t t h e w i r e s t o t h e
t e r mi n a l s in t h e ju n cti o n b o x .
5 . D i s c o n n e ct t h e r e c ei v e r c o i l w i r e s f ro m f i el d t e r mi n a l s 1 a n d 2 i n t h e
c o n t r o l u n i t .
6 . M e a s u r e t h e r e s i s t an ce o f t h e co i l .
I f t h e r e c e i v e r co i l r e si s t a n c e i s g r e a te r t h an 2 , 5 0 0 o h m s , t h e w i r i n g t o t h e
j u n c t i o n b o x o r t h e j u n c t i o n b o x c i r c u i t i s b a d .
4.5.4 Determining TMD Malfunction
I f t h e
T M D
i s n o t fu n ct i o n i n g co rr e c t ly , fo l lo w t h e t e s t p ro c ed u r es in th i s
s e c t i o n to h e lp d e t e rmi n e t h e p ro b l e m.
WARNING
Failure to follow safe installation and
servicing procedures could result in death
or serious injury.
Make sure only qualified personnel
perform installation and maintenance
procedures in accordance with the
instructions in this manual.
Allow only qualified electricians to open
and work in the electronics cabinets,
power supply cabinets, control cabinets,
or switch boxes.
WARNING
High voltage that may be present on
leads could cause electrical shock.
All switches must be OFF when checking
input AC electrical connections, removing
or inserting printed circuit boards, or
attaching voltmeters to the system.
Use extreme caution when testing in, on,
or around the electronics cabinet, PC
boards, or modules. There are voltages in
excess of 115 V or 230 V in these areas.