Remove The Controller Cabinet From The Stool; Install The Stool - Siemens ST750 General Handbook

ST750 G H
ENERAL ANDBOOK

5.5.1 Remove the controller cabinet from the stool

Remove the stool by removing its four fixing nuts and bolts and lift the controller
cabinet off the stool.

5.5.2 Install the stool

A hole should be excavated and a flagstone at least 900mm x 600mm embedded
securely at the bottom of the hole. Refer to Figure 25 for the general method of
installation and dimensions.
If the ST750 controller cabinet is being installed on a slope, allowance must be
made for ground level clearance of the door to the uphill side.
The stool is placed in the centre of the flagstone with the top surface between 50
and 75 mm above the final ground level. It is essential that the stool be fitted the
correct way round with the single centre edge holes to the front and the CET
fixing holes on the right, as shown in Figure 25. Adjustment may be required to
ensure that the top of the stool is horizontal; this should be checked using a spirit
level.
Mix up a stiff mixture of concrete (mix: 1 cement, 3 sand, 4 coarse aggregate
(20mm) with no excess water) and cover the flagstone to a height approximately
100mm (4") above the bottom of the stool. The concrete must be sloped to provide a
run up for the cables. Any cables that already enter the pit must be held away from
the wet concrete. Where there is a risk of freezing, a suitable antifreeze additive
should be incorporated in the concrete mix to ensure proper curing.
667/HB/33750/000 Page 66 Issue 6