Publicidad
Idiomas disponibles
Idiomas disponibles
Pump ranges
These operating instructions concern the following two-stage oil lubricated rotary vane vacuum pumps: VVB 250.80.
Description
On the exhaust side of the VVB an oil mist eliminator is fitted which has the function of re-circulating oil back into the circulation system. Cooling
of the oil is carried out by a water coled heat exchanger.
A standard built in non-return valve on the inlet of the pump seals the pump from the process when the pump is stopped.
The gas ballast valve (U) which is fitted as standard avoids any condensation of a small amount of water vapour inside the pump and hence
emulsification of the oil.
All the pumps are driven by a 3 phase motor via a pin and bush coupling.
Suitability
The units VVB are suitable for the use in the industrial field i.e. the protection equipments corresponds to EN DIN 294 table 4, for
people aged 14 and above.
The VVB was developed specially for use with vacuum packing machines, where a specific chamber volume is to be periodically evacuated. The
model can however also be used for the evacuation of a closed system or for a permanent vacuum from:
VVB 250.80 (stage I): 50 Hz
VVB 250.80 (stage II): 50 Hz
When these pumps are operated permanently outside the ranges listed above, there may be oil seepage at the exhaust port. If closed systems
are evacuated from atmospheric pressure down to a suction pressure close to the ultimate vacuum there will be no problem with the oil system,
provided the vacuum limit is achieved within a 10 minute pump down time.
Amounts of water vapour, water, other liquids, aggressive gases, or vapours may not be handled.
Handling of inflammable or aggressive gases and vapours is only possible with special versions, if the safety instructions XE 2 are noted.
The ambient and suction temperatures must be between 5 and 40°C. For temperatures outside this range please contact your
supplier.
The standard versions may not be used in hazardous areas. Special versions with Ex-proof motors can be supplied.
For all applications where an unplanned shut down of the vacuum pump could possibly cause harm to persons or installations,
then the corresponding safety backup system must be installed.
Handling and Setting up
Pumps that have reached operating temperature may have a surface temperature at position (Q) of more than 70° C.
WARNING! Do Not Touch.
Oil filler port (H), oil sight glass (I), oil drain plug (K), gas ballast valve (U), filter housing (X
inlet (C) and cooling water outlet (D) must all be easily accessible. The cooling air entries (E) and the cooling air exits (F) must have a minimum
distance of 20 cm from any obstruction. The discharged cooling air must not be re-circulated. For maintenance purposes we recommend a space
of 0.5 m in front of the filter housing and oil separator.
The VVB pumps can only be operated reliably if they are installed horizontally.
For installations that are higher than 1000 m above sea level there will be a loss in capacity. For further advice please contact your
supplier.
When installed on a solid base, the pumps may be installed without fixing down. If the pumps are installed on a base plate we would recommend
to fit anti vibration mounts. These range of vacuum pumps are almost vibration free in operation.
Installation
For operating and installation follow any relevant national standards that are in operation.
1. Vacuum connections at (A
1
The air handled can be exhausted into the atmosphere through the exhaust port (B) or by utilising an exhaust pipe.
Long and/or small bore pipework should be avoided as this tends to reduce the capacity of the pump.
The exhaust port (B) must not be obstructed or partly obscured.
2. The lubricating oil (recommended brands see under servicing) can be put into the pump at the oil filler port (H) of the oil separator housing, until
the oil level shows at the upper mark of the oil sight glass (l). After filling make sure oil filler port is closed.
3. The electrical data can be found on the data plate (N) or the motor data plate. The motors correspond to DIN/VDE 0530 and have IP 54
protection and insulation class B or F. The connection diagram can be found in the terminal box on the motor. Check the electrical data of the
motor for compatibility with your available supply (voltage, frequency, permissible current etc.).
4. Connect the motor via a motor starter. It is advisable to use thermal overload motor starters to protect the motor and wiring. All cabling used
on starters should be secured with good quality cable clamps.
We recommend that motor starters should be used that are fitted with a time delayed trip resulting from running beyond the amperage setting.
When the unit is started cold, overamperage may occur for a short time.
The electrical installation may only be made by a qualified electrician under the observance of EN 60204. The main switch must
be provided by the operator.
5. Cooling water inlet at (C) and cooling water outlet at (D).
Initial Operation
1. Initially switch the pump on for a few seconds only to check the direction of rotation against the direction arrow (O).
2. Run the pump for two minutes with correct rotation. Stop pump and top up the oil utilising the oil filler port (H) to the correct level (see sight
glass (l)).
On no account open the oil filler port (H) when the pump is operating.
3. Connect suction pipes at (A
4. Connect pipes for cooling water inlet at (C) and cooling water outlet at (D).
Potential risks for operating personnel
1. Noise Emission: The worst noise levels considering direction and intensity measured according to DIN 45635 part 3 (as per 3. GSGV) are shown
on the table at the back. When working permanently in the vicinity of an operating pump we recommend wearing ear protection to avoid any
damage to hearing.
2. Oil mist in the Exhaust Stream: Even with the high efficiency oil mist eliminator the exhausted air could still contain extremely low amounts of
oil mist which can occasionally be detected by smell. Permanent breathing of these mists may result in health problems, therefore it is extremely
important to make sure that the installation area is well ventilated.
0.9 to 200 mbar (abs.)
10 to 200 mbar (abs.)
)
higher capacity and at (A
) and (A
).
1
2
)
lower capacity.
2
, X
), oil separator housing cover (Y), cooling water
1
2
Publicidad
