Siemens LOHER CHEMSTAR 1PS2 - Mounting Power Output Elements; Feather Key Shaft Extension Procedures; Warning: Feather Key Fall-Out Risk

Pulling on the power output elements
● Prerequisites:
–
The coupling and/or the output element must be appropriately dimensioned for the
operating case at hand. The balance quality must satisfy the following requirements.
– Comply with the coupling manufacturer's instructions.
– Make sure that the balancing type of the output element correctly matches the type of
balance of the rotor.
– Use only ready drilled and balanced output elements. Check the hole diameters and the
balancing status before pulling them on. Thoroughly clean the shaft extension.
● Pulling on:
– Warm up the output elements to expand them before pulling them on. Select the
temperature difference for the heating process to suit the coupling diameter, fit and
material. See the coupling manufacturer's instructions.
– Power output elements may only be pulled on or pulled off with the correct equipment.
The output element must be pulled on in one continuous operation via the front thread
holes in the shaft or pulled on by hand.
– Do not strike it with a hammer, as this would damage the bearings.
Shaft extensions with feather key
To maintain the balancing quality, you have the following options:
● If the output element is shorter than the feather key with balancing type "H", then you must
machine off the section of feather key protruding from the shaft contour and output element
in order to maintain the balance quality.
● The feather key must be shortened if the coupling hub is shorter than the feather key.
● The center of gravity of the coupling half should be within the length of the shaft end.
● The coupling used must be prepared for system balancing. The number of poles of the
machine is specified on the rating plate (in the designation of the machine type).
WARNING
The feather key can fall out
The feather keys are only locked against falling out during shipping. If a machine with two
shaft extensions does not have an output element on one shaft extension, the feather key
can fall out during operation.
Death or serious injury can result.
●
Do not operate the machine unless the output elements have been pulled on.
●
On shaft extensions without output element, make sure that the feather key cannot fall
out and shorten it by approximately half for balance type "H".
Assembly
5.5 Installing the machine
LOHER CHEMSTAR 1PS2
Operating Instructions 08/2016 51