YOKOGAWA FC500G, User Manual, Page: 31 / 41

<6. INSPECTION AND MAINTENANCE>
6-4
IM 12F5A2-01E
(5) Mount the two pulleys and the belt in the reverse procedure.
Note: If the belt is replaced, perform the procedure described in the following steps (6) and (7) without fail.
(6) Loosen the four mounting screws of the (acrylic) holder that secures the rotating shaft. Set a
spring balance to the hole under the rotating shaft slip ring and pull the shaft in the direction
of applying tension to the belt.
(7) Fix the holder. Tighten the holder-securing screws with a tension set at 0.4 kgf.
(8) Mount the brush. Fit the brush hole above the right brush-securing screw in with the
positioning pin on the mounting bracket and tighten the two brush-securing screws.
(Exercise care so as not to bend the brush tip.)
Confirm that the brush contactor contacts the slip ring and that the brush does not touch the
pulley. Adjust the contact-pressure of the brush contact or in the following procedure:
● Loosen the two securing screws of the brush-mounting bracket.
● Loosen the lock screw to the right of the contact-pressure adjusting screw.
● Move the brush-mounting bracket toward you to once separate the brush contactor from the
slip ring.
● Screw in the contact-pressure adjusting screw and then further screw in by three and a half
turns from the position where the brush contactor just contacts the slip ring. The contact of
the contactor to the slip ring should be judged by the resistance change on a multi-meter
connected between the brush and slip ring.
● Tighten the lock screw. Also tighten the brush-mounting bracket securing screws.
(9) Turn ON the converter power switch. Confirm that the driving and rotating shafts revolve
smoothly. Visually confirm that there is no irregularity at the contact part of the brush and the
slip ring.
(10) Measure the resistance value again between the brush and the slip ring and confirm that it is
500 Ω or less.
(11) Mount the electrode assembly cover.
(12) Confirm that the concentration displays present the proper values and then mount the
converter cover.