Karcher HD 7-250 De Tr1 - Manual (Page 63)

Produkt.pm6.5 - GB
Page 2.7
Product description
BOGE Operating instructions for CM 9 series screw compressor module
General
Safety temperature
limiting device
Safety valve
Compressor drive
and design features
ATTENTION!
Do not operate the compressor without built-in safety devices.
Do not dismantle the safety devices or put them out of operation.
The safety temperature limiting device (Pt 1000 Temperature sensor series)
has to be connected to the control on site prior to commissioning. (see also
dimensioned drawing on page 2.8) Once the maximum admissible final
compression temperature has been reched, the compressor has to switched
off. The compressor must not switch on when dropping below the minimum
temperature. (Temperatures see page 3.3).
Safety valve on the compressed air/oil
receiver prevents the maximum admis-
sible pressure being exceeded. When
the maximum pressure is exceeded (e.g.
incorrect setting of the operating pressure
switch), the entire delivery volume of the
compressor is ejected.
The CM 9 screw compressor qualifies for both electric motor or I.C. engine
drive. An arrow is used to indicate the sense of rotation of the driving shaft.
Wrong sense of direction will cause the compressor to be destroyed within
seconds. Proper clutch selection largely depends on the degree of irregular-
ity of I.C. engines. It is therefore recommended to check the critical torsion
speed with regard to likely I.C. engine cylinder misfire. Use connections as
shown in compressor outline drawing to connect screw compressor module
free of (mechanical) tension to drive system and compressed air line. Com-
pressed air protrudes from block at approx. 70 – 95°C. Apart from a com-
pressed air after-cooler, an oil cooler should also be provided. The amount
of waste heat is estimated at around 80% of the installed drive power.
Present module is also suited for V-belt drive and larger transverse forces
(thus acting in radial direction) impacting on the driving journal. Taking into
account the roller bearings and their rated working life of 20,000 hours (at
4,500 rpm including a 10% failure risk), a max. transverse force of 1,000 N is
admissible to act on the driving journal, whereas in the event of transverse
forces acting in alternating directions (as may occur in case of an unbalance)
max. forces should not exceed 250 N. Transverse forces must at any rate
impact on the driving journal. Please contact BOGE if a belt pulley is to be
mounted on the driving journal’s extension. Make sure that no axial forces can
act on the driving journal; forces of less than 20 N are negligible. The moment
of inertia of this stage is around 0,0025 kg/m². Torsional moments ranging
from 0 and twice the rated moment and acting on the drive journal will cause
no harm to neither stage nor adjusting spring. If, for example, unbalance is
generated by an I.C. engine causing the torque direction to change during
rotation, please contact BOGE with view to the loads acting on both rotor
teeth surfaces and adjusting spring. It should also be taken into account that
such type of changing torques will only occur during prolonged idle times.
2.5 Safety and monitoring devices
1