KSB MK, Installation & Operating Manual

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5 Installation at Site
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MK
Fig. 7: Float switch a) installation position; b) switching position
1. Fasten strip 575.51 to the motor flange and strip 575.52 to the pump casing with
hexagon head bolt 901.52, hexagon nut 920.52 and spring washers 930.52.
2. Mount float switch 81-45 on strip 575.51 using hexagon socket head cap screws
900.51, discs 550.51 and nuts 920.51.
3. Fit the lever on float switch 81-45.
4. Assemble guide rod 574 with float 74-4 and the two upper adjusting rings
500.50.
5. Run the guide rod through strip 575.52 and fit adjusting ring 500.50 beneath
the strip.
6. Connect the lever and the guide rod using hexagon socket head cap screw
900.50 and hexagon nut 920.50.
7. If applicable, fit bellows 481 and hose clamp 733.51 on the guide rod.
8. Fasten the bellows on cover plate 68-3 with hose clamp 733.52.
9. Position adjusting rings 500.50 in the desired switching levels above and below
the float, respectively, to start and stop the pump as required.
10. Adjust the switching mechanism of float switch 81-45 such that the lever is
angled 42° off the horizontal in non-actuated position, see illustration of float
switch a) installation position. In installed condition, the lever position must be
as shown in the illustration of the float switch b) switching position.
ð
As the float rises, the lever is lifted into the position shown and contact 15-16
closes.
11. Check that the rod-actuated float switch functions properly.
5.3.1.2 Magnetic float switch control (non-ATEX applications only)
Pump sets for installation depths of 1000 and 1900 mm are controlled by a magnetic
float switch arrangement. It is equipped with a sensor tube with integrated dry-reed
contacts. The float with integrated permanent magnets can move freely along the
sensor tube and activates the dry-reed contacts when it reaches the minimum and
maximum fluid levels. The fluid levels are permanently pre-set by means of adjusting
rings.
Fitting the magnetic float switch control
1. Remove the plug from the G
3
/
4
through-hole in the cover plate.
2. Tightly screw the magnetic float switch arrangement into the G
3
/
4
hole provided.