Stator winding
The stator winding has a temperature class according to EN 60034-1, see rating plate. High-
quality enameled wires, suitable surface insulating materials, and the type of impregnation
guarantee great
mechanical and electrical stability together with a high utility value and a long
service life.
Risk of ignition on the rotor
Note that the manufacturer has performed a risk assessment for all machines with regard to
sparking between the rotor and the stator. There is a risk of explosion if potentially explosive
gas is drawn in at startup. If purging is required, an additional plate must be attached to the
electric machine.
Additional plate:
Purging is required before the start in compliance with the risk evaluation for squirrel-cage
rotors according to IEC / EN 60079–15:2010
Refer to "Purging before the start"
Machine housing with surface, hollow-rib or tube cooling
Depending on their size, the stator frame and bearing shields are made of cast iron or steel.
The fan cover is made of sheet steel. The stator frame surface has cooling ribs, hollow ribs,
or tubes and mounted terminal box.
Cooling for machines with surface cooling, hollow-rib cooling or tube cooling
For machines with rib, hollow-rib or tube cooling, the cooling air is drawn in through openings
in the fan cover. The air is blown over the surface or through the cooling tubes of the stator
frame. With hollow-rib or tube cooling, a closed cooling air circuit inside the machine assists
with heat dissipation.
Bearings
The machine is equipped with grease-lubricated roller bearings.
● The bearings of the standard size machines (up to size 280) are permanently lubricated.
● The bearings of machines from size 315 upwards have a relubrication facility and automatic
grease quantity control.
Terminal boxes
In the terminal box, additional connecting terminals are available if required for monitoring
equipment. For larger machines, an additional terminal box can be optionally mounted. You
can see the number of available terminals in the circuit diagrams.
Description
LOHER CHEMSTAR 1PS2
Operating Instructions 08/2016 23
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