YOKOGAWA FC400G User Manual

< 8. Maintenance >
8-6
IM 12F5A1-01E
(2) Remove the two pulleys of the drive shaft (cell motor shaft) and driven shaft (indicator
electrode-mounting shaft).
The driven shaft pulley can be removed by inserting a 2 mm nominal size Allen wrench
(accessory) into the hole in the shaft, which is used as a lock, and unscrewing the end of the
driven shaft. The drive shaft pulley can be removed by unscrewing two set screws using a
1.5 mm nominal size Allen wrench (accessory).
Remove the pulleys together with the drive belt.
(3) UnscrewthescrewsxedontheterminalblockofRotatingcontact.Unplugthecable
terminalsofRotatingcontact.RemoveRotatingcontactfromDrivenshaft.Holdanew
rotating contact, with its metal top facing toward you, while the cable being on your right
side. Then put the driven shaft throught the center hole.
(4) Install the pulleys and drive belt in place.
(Note)Mountdriveshaftpulleysothatthetipoftheshaftcanprojectout0.3to0.7mmfromtheendofthepulley.
(5) Install wiring terminals of Rotating contact on the block terminal of Rotating contact. Be sure
that the wiring never contacts the drive belt.
(6) FeedpowertoFC400G.Conrmthatthedrivenshaft/driveshaft/drivebelt/rotatessmoothly,
and that there are no abnormal sounds, like vibration or discontinuous noises.
This completes the replacement procedure.
CAUTION
When you shut the cover of electrode mechanism, be careful not to get the cables caught that
run inside the analyzer.
8.2.2 Check/Maintenance/ReplacementofDriveBelt
When you polish the indicator electrode, and remove the electrode mechanism block cover for
maintenance, check the drive belt as follows (once in three months recommended).
• Check for powder (from drive belt friction) deposited on motor mounting plate and the like.
As the drive belt ages, and the mating of the teeth on the pulley with the teeth on the drive
belt worsens, the amount of powder deposited increases.
• When the driven shaft pulley is rotated clockwise or anticlockwise, its small “play” causes
the drive pulley to rotate. If the drive belt loosens and cannot transmit enough traction, the “
play” becomes larger.
Onceinsixmonthsyoushouldperformthefollowingchecksandmaintenance:
• Check if aging of the drive belt has caused cracking. If there is serious cracking, replace it.
• Check if the drive belt teeth are badly worn. If so, replace it.
• Check if powder from the drive belt is stuck to drive shaft or driven shaft.
Ifthispowderisadverselya󰀨ectingpulleyoperation,removeforcleaning.Whencleaning
thepulley,alsocleanpowderfromthedrivebelto󰀨themotormountingplate.
[Replacing the Drive Belt]
Whenreplacingthedrivebelt,thetensioninthedrivebeltneedstobeadjustedorthedrive
beltlikemaybeadverselya󰀨ected.Becausethisadjustmentisrathertime-consumingand
troublesome,itisrecommendedthat,wherepossible-exceptwhenthedrivebeltisnolonger
rotatingtheelectrodereliably,andneedstobeurgentlyxed-thedrivenshaftassemblyand
motor be replaced at the same time as the drive belt.
Ifyouwanttoreplacejustthedrivebelt,refertoSec.8.2.3(12)and(13).

YOKOGAWA FC400G Specifications

General

Brand	YOKOGAWA
Model	FC400G
Category	Measuring Instruments
Language	English