Drawing 10148 REV 0 24-11-15
Electric Agitator Instructions
6.2 START-UP Before starting the agitator, it is advisable to carry out the following checks.
On the motor
Check the connections (bonds on the inside of the terminal board) are arranged in an exact way and
so as to correspond with the supply voltage of the of the control line, which must always have the
ground wire. The entry of the cable into the terminal board must be well insulated and the cover
must be screwed with care. We recommend the insertion between the feed line and the motor of
suitably calibrated overload cut out for the rated current in amperes indicated on the plate. Without
the overload cut out there is no guarantee for the damage of the winding. The rotation direction is
generally clockwise, viewed from the motor side, and is in any event indicated by an arrow located
on the motor itself. Possible exceptions to this rule will be specified and the reversal of the rotation
direction can be obtained by reversing two phases of the feed line among them.
On the impeller
Do not start the agitator if the impeller is immersed in silt, unless this method of operation has been
conditioned in the design phase.
On the entire unit
Check the tightening of all the bolts and nuts. (repeat the operation after two weeks of operation).
After having carried out above-mentioned inspections, you may proceed with starting the agitator
with the pre-arranged control devices. At the beginning of the operation, just as any machine
running in, an agitator – caused by the greater friction’s – can lead to overheating and a higher
absorption of current of the motor; these problems gradually disappear during the operation. When
a gearbox – cycle converter – is installed, it is generally advisable in time to gradually increase the
transmitted power, starting from the minimum values, or limiting it (50-70% of the maximum
power) for the first hours of the operation. Should an excessive unforeseen absorption occur,
disconnect the motor from the power grid, check the perfect efficiency of the contact of the
connections and check that the working conditions correspond to those established, especially with
regard to the density and viscosity of the liquid; in case the overload persists, contact our technical
department. If there are vibrations, stop the agitator immediately and determine the causes that
provoke it. All the agitators are suitable for the operation with a maximum and constant level; if not
foreseen in the dosing phase, avoid the operation in tanks at variable or insufficient levels.
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