Festo SEC-AC-305, Fitting And Installation Instructions

Page: 28 / 90

1 . Summ a ry o f co mp o n e nt s
1 − 1 4
F es t o P.BE−SE C − AC −HW−EN e n 0511c
1.9 Monitoring functions
1 . 9 . 1 Br ie f d esc r i pt io n
Th e SE C − AC p ossesses a n e xt e n si v e a rr a n ge m e nt o f se n so r s
wh ic h m o n i t o r th e f a u l t less fun c t io n i n g o f th e co ntr olle r un i t,
th e f i n al o utput s t age , th e m o t o r a nd th e co mmun ica t io n w i th
th e p e r i ph e r als .
Err o r m e m o r A ny f a u l t s wh ic h occ ur a r e sa v e d i n th e i nt e rn al e rr o r m e m o ry.
M os t e rr o r s ca u se th e co ntr olle r un i t t o s w i t c h o ff th e r eg u la
t o r a nd th e f i n al o utput s t age . Th e r eg u la t o r ca nn o t b e s w i t
c h e d o n agai n unt il th e f a u l t h as b ee n r ec t i f ie d a nd th e e rr o r
m e m o ry h as b ee n d ele t e d by qu i tt i n g ( s w i t c h o ff th e v ol t age
o r ac tu a t e th e r ese t butt o n a b o v e th e f ig ur e d is p la y).
1 . 9 . 2 M o n i t o r i n g th e f i n al o utput s t age
Th e f i n al o utput s t age is m o n i t o r e d by e xt e n si v e pr o t ec t i v e
fun c t io n s .
Ov e r c urr e nt a nd s h o rt− ci r c u i t m o n i t o r i n g :
Th is r e p o nd s as soo n as th e c urr e nt i n th e i nt e rm e d ia t e
ci r c u i t e x cee d s tw ice th e m a x i mum c urr e nt o f th e r eg u la
t o r. Sh o rt ci r c u i t s b e tw ee n tw o m o t o r ph ases a r e r ecog n i
z e d as w ell as s h o rt ci r c u i t s a t th e m o t o r o utput t e rm i n als
i n r es p ec t o f th e p osi t i v e a nd n ega t i v e r e f e r e n ce p o t e nt ial
o f th e i nt e rm e d ia t e ci r c u i t a nd i n r es p ec t o f pr o t ec t i v e
ea rth. Wh e n th e e rr o r m o n i t o r i n g r ecog n i z es a n o v e r c ur
r e nt, th e f i n al o utput s t age is s w i t c h e d o ff i mm e d ia t el y, so
th a t r esis t a n ce t o s h o rt ci r c u i t s is g u a r a nt ee d.
Ov e rv ol t age m o n i t o r i n g f o r th e i nt e rm e d ia t e ci r c u i t:
Th is r es p o nd s as soo n as th e i nt e rm e d ia t e ci r c u i t v ol t age
e x cee d s th e o p e r a t i n g v ol t age r a n ge . Th e f i n al o utput
s t age is th e n s w i t c h e d o ff.
T e mp e r a tur e m o n i t o r i n g f o r th e h ea t si nk: Th e h ea t si nk
t e mp e r a tur e o f th e f i n al o utput s t age is m eas ur e d w i th a