Sartorius MC 5, Руководство по обслуживанию, Страница: 39 / 49

Stand 1/94 SARTORIUS MC 5 Balance 39
MC 5
Disassembling the Draft Shield Bearing
- Disassemble the draft shield base unit from the weighing system (see
"Disassembling the Draft Shield Base Unit“ on page 38).
- Remove the V-belt (508) from the drive (504).
- Detach the cover plate (516), the 14mm locknut (515) and the thrust
ring (514), and remove the support disk (512).
- Now you can exchange the bearing ring ((510) and the bearing shell
(513).
- It is important that the ball side of the bearing thrust ring (510) and the flat side of the bearing
shell (513) face upward.
- Position the support disk (512) on the adapter, which must be
centered with respect to the curved draft shield panel. Turn the disk
slightly until it rests completely flat. Press-fit the V-belt (508) in the
groove of the support disk (512).
- Unscrew the thrust ring (514) just until it has sufficient clearance.
Then place the V-belt (508) on the drive (504).
- Now attach the locknut (515) to the thrust ring (514). Hold the thrust
ring in place while tightening the locknut (515).
- Turn the support disk (512) by hand. If you hear a scraping sound
when you turn the disk, or if it is difficult to turn, slightly loosen the
thrust ring. In rare cases, you may need to adjust the sensor PCB
(507).
- Assemble the complete draft shield by following the steps listed above in the reverse order.
- Important note: Make sure to insert the sensor cable (506) through the slot in the system holding plate
(319) and plug in the connector. Check that none of the cables is jammed.
- Allow the microbalance to warm up briefly (wait approx. 30 minutes) so that it will be ready to operate
again.
Checking and Adjusting the Draft Shield Bearing
- Press the key.
If the draft shield does not open easily, slightly loosen the thrust ring
(514).
If the draft shield closes beyond the normal position, slightly retighten
the thrust ring (514).
To do so, hold the thrust ring in place while tightening the locknut
(515).
- Check that the speed of the draft shield movement is the same for
each direction.
- If this is not the case, you need only to remove the top part of the
housing (201) - see "Disassembling the Draft Shield Base Unit“) and
the screw on the right (502a) or on the left (502b); slightly move back
the angular retainers (502) of the curved panel (501); and retighten
the screw.
- Check the functioning of the draft shield movement again as described
above; if necessary, re-adjust.
- Close the weighing system by following the steps above in the reverse
order.
- Attach the cover plate (516), and mount the shield plate (204), the
weighing pan (203) and the draft shield (202).
- Allow the microbalance to warm up briefly (wait approx. 30 minutes) so that it will be ready to operate
again.