Festo VOFA-B26-T52-M Series, Operating Instructions Manual

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V O F A −...
F e sto V O F A −... 100 4 N H E n g li sh
4 7
Qualification of trained personnel
A ss em b l y, in st alla t i o n , c o mmi ss i o nin g, main t enance , r e p ai r an d r em ov al f ro m
op e r a t i o n ma y o nl y b e p e r f or me d by q ualifie d p e rso nnel wi th k n o wle dg e an d
e xp e r ience wi th elec tr ical an d p neuma t ic c o n tro l t ec h n o l ogy.
Common cause failures (CCF)
C o mm o n cau s e failu r e s cau s e th e l oss o f th e s afe ty func t i o n , s ince in th i s ca s e
both c h annel s in a t w o− c h annel syst em fail s imul t ane o u s l y.
Thro u gh th e f o ll o win g mea s u r e s, yo u en s u r e th a t c o mm o n cau s e failu r e s a r e
a vo i d e d:
C o m p liance wi th th e p e r mi ss i b le v alue s f or v i br a t i o n an d sho c k str e ss a s well
a s a rr an g emen t o f th e v al v e l o n g i t u d inal a x e s v e rt icall y (90 °) to th e main
d i r ec t i o n o f v i br a t i o n
C o m p liance wi th th e t em p e r a t u r e r an g e
C o m pr e ss e d ai r q uali ty c o nf or min g to th e t ec h nical d a t a , in p a rt icula r
a vo i d ance o f fl y in g r u st d u st (e .g. cau s e d by s e rv ice w ork) a s well a s
c o m p liance wi th a r e s i d ual o il c o n t en t o f ma x. 0 . 1 m g/ m ³ w h en u s in g o il s
c o n t ainin g e st e rs (w h ic h can b e inclu d e d in c o m pr e ssor o il s, f or e x am p le )
C o m p liance wi th th e ma x imum op e r a t in g pr e ss u r e , if nece ss a ry thro u gh u s e o f
a pr e ss u r e −r elief v al v e
C o m p liance wi th th e ma x. p e r mi ss i b le p ul s e p a tt e r n s wi th u s e in t ime d s afe ty
o u tp u ts ( k e y w ord: c o n tro l syst em p ul s e s)
C o m p liance wi th th e p e r mi ss i b le ma g ne t ic fiel ds
O bs e rv e th e t ec h nical d a t a in c h a pt e r 13 .
Diagnostic coverage (DC)
A D C o f 99 % can b e ac h ie v e d thro u gh an a ppropr ia t e in t e gr a t i o n o f th e c o n tro l
b l o c k in th e c o n tro l c h ain an d a c o nf or min g d ia g n os i s. I f d u r in g th e d ia g n os i s a
malfunc t i o n i s r ec og ni s e d, a ppropr ia t e mea s u r e s mu st b e t a k en to main t ain th e
s afe ty le v el .