ROTORCOMP NK 100, Operating Manual, Page: 29 / 52

Operating Manual - NK 100
[en] 09/2008 5.3
5.4 Belt drive
Improper design and/or installation of the V-belt
drive can result in a considerable reduction of he
bearing life and/or to breakage of the drive shaft.
If the drive shaft breaks and/or in case of bearing
damage, ROTORCOMP can only grant a warranty
if the belt driven is properly designed and exe-
cuted.
The following information must be observed for
this purpose.
– The belt drive must not be underdimensioned.
The maximum design output for a belt drive is
30.0 kW at 7,200 rpm for this screw compres-
sor.
– The belt pulley must be pushed onto the drive
shaft as far as possible and secured.
– The V-belt pulleys must be balanced.
It is not permissible to drive the belt pulley onto
the drive shaft by striking it with a hammer, as
this can result in bearing damage.
– When aligning the belt drive, exact parallelism
without vertical and horizontal angular errors
must be ensured.
– A torsionally rigid base frame for the belt drive
must be installed so that it aligns exactly with
the compressor module.
– "Fluttering" of the belt of the belt drive should
be prevented with construction measures (axis
spacing of pulleys, belt tension and stability of
the base frame and tensioner).
5.5 Direct drive
e
Caution:
Offset and angular errors result in damage to
bearings and drive shaft!
ROTORCOMP recommends installation with an
elastic coupling. The alignment of the motor and
compressor module must be carried out according
to the instructions of the elastic coupling manufac-
turer.
The compressor module is provided with a center-
ing flange for directly coupled units.
The flanged unit can be fastened stress-free on
the base frame. The connection dimensions of the
flange are contained in the offer drawing.