Operation & Service Manual (VA) 42 ST1175
For higher lifting capacities, sets must be combined in a column ring.
If you want to lift the maximum weight with a set of 6, two main columns with two
power supplies must be used because the current will otherwise be too high.
Main columns are positioned in a circuit in such a way that the load to be lifted by
the set (main column followed by auxiliary columns up to the following main
column) will not be more than the maximum lifting capacity.
Each main column has been provided with a thermal relay that protects a set of
columns against overloading and the lifting system against electrical overloading
for safety reasons.
6.4 Control box
All functions of the lifting system are controlled from the control box on the column
lift.
There are two types of control boxes:
the control box of a master column,
the control box of a slave column.
These two control boxes are identical externally except that the control box of a
slave column has an emergency shut-down button instead of a main switch (that is
also used as an emergency stop button) and it does not have mains supply.
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