SORVALL
®
Centrifuges
Maintenance
4-3
Figu re 4 -1 . REV/ MIN x 1 0 0 0 In d ica tor Ad ju s tm en t
Motor Brush Inspection and Replacement
1 .
Un p lu g t h e cen t r ifu ge p ower cor d .
2 .
Rem ove t h e fou r s cr ews fr om t h e a cces s cover a n d r em ove t h e cover.
3 .
Rem ove t h e p la s t ic b r u s h ca p s fr om t h e m ot or wit h a s cr ewd r iver, a n d p u ll t h e
b r u s h es fr om t h eir h old er s , n ot in g or ien t a t ion s .
NOTE
Before inserting the replacement brushes, remove any carbon accumula-
tion from the interior of the brush holder. The brush should then move freely
in the brush holder.
a .
If t h e b r u s h es a r e lon ger t h a n 6 m m (1 / 4 in ch ), n ew b r u s h es a re n ot n eed ed .
Rein s t a ll b r u s h es in t h eir or igin a l b r u s h t u b es wit h t h e s a m e or ien t a t ion .
b .
If t h e b r u s h es a r e s h or t er t h a n 6 m m (1 / 4 in ch ), r ep la ce wor n b r u s h es wit h n ew
b r u s h es , Ca t a log No. 1 2 7 3 2 .
NOTE
If this is not the original set of brushes and the brushes are shorter than
6 mm (1/4 inch), periodically (that is, after 3 to 4 brush set changes) have
the armature commutator inspected for wear and roughening (pitting) by
a qualified technician when the brushes are replaced. If necessary, replace
the armature.
4 .
Rein s t a ll t h e p la s t ic b r u s h ca p s , m a k in g s u r e t h a t t h e b r u s h s p r in g r et a in er “ea r s ” a r e
s ea t ed in t h e b r u s h h old er s lot s (s ee figu r e 4 -2 ).
5 .
Rein s t a ll t h e a cces s cover a n d s ecu r e in p la ce u s in g t h e fou r s cr ews r em oved in s t ep 2 .
6 .
Wit h t h e
POWER
s wit ch s et t o "
0
", p lu g in t h e cen t r ifu ge p ower cor d .
7 .
If a n ew a r m a t u r e a n d / or n ew b r u s h es h a ve b een in s t a lled , r u n t h e cen t r ifu ge a t
1 0 0 0 r p m wit h a r ot or for 3 0 m in u t es t o s ea t t h e b r u s h es . Fa ilu r e t o d o t h is will r es u lt
Summary of Contents for RT6000B
Page 25: ...SORVALL Centrifuges Maintenance 4 7...
Page 26: ...APPENDIX...