Du Pont SORVALL RC-5 Service Manual page 146

Maintenance
&
Repair
Son/all®
Centrifugesb.
Installation1.
Connect and firmly
secure,
then Insulate with electrical
tape,
the two black wires
onthe
saturable
reactor.2.
Secure the saturable reactor to
the
base support
with the four
cap screws
and
flatwashers.3.
Secure
the
TB307
bracket to the saturable
reactor
with the
two hex
nuts.4.
Connect
the
terminating wires
to
the TB307
terminals as applicable
and
tighten
ter¬minal
screws.5.
Install the insulator, then secure with the two
grommets,
flat
washers and hex
nuts.6.
Reinstall the front
cabinet
panel.7.
Calibrate in accordance
with Table
7-1.6-7.
Drive
Motor Brush
Replacement,
RC-5a.
Removal1.
Set
main
circuit breaker
to
OFF.2.
Unplug
the
power
cord
from
socket.NOTEThe
drive motor is
equipped
with
two brushes. Always replace
bothbrushes,
never replace only
one
brush.3.
Remove the drive motor from the
centrifuge (paragraph
6-4).4.
Lift
up
the brush
springs
and withdraw the brushes from their
holder.5.
If
the
brush length is less
than 14
mm (9/16 In) (see Figure 6-10).
the
brushes
mustbe
replaced.
If
the brushes are badly pitted
or worn unevenly,
or
if
the
commutatoris
badly
grooved,
the armature
may
have to be
replaced.
If
the armature needs
re¬placement,
contact Customer
Service
at (800)
551-2121
(or in locations outside
theU.S.,
an authorized distributor or
agent
for Sorvall®
products).b.
Installation1.
To
replace brushes, simply
loosen the brush
wire
connectors and
remove
the
oldbrushes.
Be
sure to insert
the
new brushes into
the
holders so
that the
bevelledends
match the bevel of the
commutator (see figure
6-11).6-8