Elmo Rietschle C-VLR 301 - Manual (Page 13)

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Set up and operation
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4.1.1 Data plate
Fig. 3 Data plate
1 Type/ Size (mechanical version)
2 Serial number
3 Year of construction
4 Item no.
5 Final pressure (abs.)
6 Pumping capacity
7 Speed
8 Motor output
9 Operating mode
4.2 Description
The C-VLR 301 model has a connection fl ange on the inlet side and an exhaust silencer on the pressure side
(Fig. 2/B
1
). The air sucked in is cleaned by a micro-fi lter. An integral non-return valve prevents the evacuated
system from being ventilated after the pump has stopped.
The ZEPHYR VLR 301 is a double shaft rotary piston vacuum pump in which the claws roll off against each
other contact free and dry. The counter-rotating claw rotors are synchronised by a gear pair in the gearbox.
The synchronous gearbox gear wheels and the bearings are lubricated with oil. These components are in
a gearbox that also contains the oil supply. Oil conveying devices always ensure that the bearings and the
gear wheels are suffi ciently supplied with oil at all permissible speeds.
The gearbox and the compression chamber are separated from each other by special seals. The gearbox
is sealed from the outside with shaft seals and O rings, the compressor chamber with piston rings. The
VLR 301 is enclosed in an insulating hood. In order to dissipate compression heat, the cooling air is sucked
through between the machine and the hood using a drum fan that sucks in the fresh cooling air (Fig. 2/E)
and discharges the heated air out of the cooling air outlet (Fig. 2/F).
The VLR 301 is driven by standard fl anged three-phase motors via a coupling.
A vacuum relief valve is incorporated into the machine.
4.3 Areas of application
This contact free running claw vacuum pump, the C-VLR 301, can be operated constantly at any pressure
between 700 mbars (abs.) and an inlet pressure of 150 mbars (abs.).
When evacuating closed systems the volume to be evacuated must be no more than 2% of the nominal
pumping capacity of the vacuum pump.
The pumping capacity with unrestricted suction is 290 m 3 /h at 50 Hz. Data sheet D 885 shows the depend-
ency of the pumping capacity on the intake pressure.
If the unit is switched on more frequently (at regular intervals of about 10 times an hour) or at
higher ambient temperatures and intake temperatures, the excess temperature limit of the motor
winding and the bearings may be exceeded.Please contact the manufacturer should the unit be
used under such conditions.
If it is installed in the open air the unit must be protected from environmental infl uences, (e.g. by
a protective roof).