YOKOGAWA FC500G, User Manual, Page: 37 / 41

<8. AUXILIARIES AND CONSUMABLES>
8-2
IM 12F5A2-01E
8.2.6 Brush and Slip Ring (Part number: K9332JX, K9332JZ)
Normally, two years are considered the replacement interval. Replacement of both items as a
pair should be performed.
CAUTION
Do not touch the brush except when replacement is performed.
l
Procedures for adjusting the brush contact pressure and removing wear
debris from the slip ring
Wear debris generated from the sliding action of the slip ring and brush (generated largely at the
beginning), may enter between the slip ring and the brush, thereby temporarily increasing the
contact resistance. This may cause a drop in readings. When this phenomenon occurs, polish
and clean the surface of the slip ring to prevent the generation of wear debris and the ingress
of wear debris generated into a space between the slip ring and the brush, and furthermore
increase the contact pressure of the brush to the slip ring surface.
(1) Polishing and cleaning the surface of the slip ring
With the FC500G being powered, press sandpaper (#2000) on the rotating slip ring. Then,
press a cotton swab soaked in alcohol on the rotating slip ring to wipe off debris.
(2) Increasing the brush contact pressure
Turn off power to the FC500G. Loosen the lock screw next to the contact pressure adjusting
screw and then the 2 fixing screws for the brush mounting bracket. Turn the contact
pressure adjusting screw in 1/2 turn.
Tighten the lock screws and bracket fixing screws. Make sure that the brush does not come
in contact with the pulleys and does not come off the slip ring. Then turn on the power.