Rietschle VVL 15 Instructions De Service page 4

Handling and Setting up
Pumps that have reached operating temperature may have a
surface temperature at position of more than 70°C. WARNING! Do
Not Touch.
Oil filler port (H), oil sight glass (I) and oil drain plug (K) must all be easily
accessible. The cooling air entries (E) and the cooling air exits (F) must have
a minimum distance of 15 cm from any obstruction.
The VVL pump can only be operated reliably if it is 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 pump may be installed without fixing down.
If the pump is installed on a base plate, we would recommend fitting anti-
vibration mounts. This range of the vacuum pump is almost vibration free when
in operating.
Installation
For operating and installation, follow relevant national standards
that are currently in use.
1. The vacuum connection at (A).
Long and/or small bore pipework should be avoided as this tends
to reduce the capacity of the pump.
2. The lubricating oil (recommended brands see under servicing) should be
put into the pump at the oil filler port (H) of the oil tank. Fill until the oil reaches
the centre of the oil sight glass (l). After filling, make sure the oil filler port
is closed.
3. 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 electri-
cian under the observance of EN 60204. The main switch must be
provided by the operator.
Initial Operation
1. Initially, switch the pump on and off for a few seconds 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 using the oil filler port (H) to the correct level (see sight glass (l)).
On no account open the oil filler port when the pump is operating.
3. Connect the suction pipe at (A).
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 in 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 inhalation of
these mists may result in health problems, therefore it is extremely impor-
tant to make sure that the installation area is well ventilated.
Maintenance and Servicing
When maintaining these units and having such situations where
personnel could be hurt by moving parts or by live electrical parts
the pump must be isolated by totally disconnecting the electrical supply.
It is imperative that the unit cannot be re-started during the maintenance
operation.
Do not work on a pump that is at its normal operating temperature as
there is a danger from hot parts or hot lubricant.
1. Air filtration (see E 182)
The capacity of the pump can become reduced if the air inlet filters
are not maintained correctly.
Filters on the suction side: Mesh filter (22) must be cleaned regularly depend-
ing upon the amount of contamination. Cleaning can be carried out by washing
out or by blowing out with compressed air. Replace filters if contaminated
completely.
The mesh filter (22) can be dismantled by removing screws (24) on the
connection cover (23).
Filter for Gas ballast: All pumps are equipped with a gas ballast valve (U).
The built in filter cartridge (45) must be cleaned regularly depending upon the
amount of contamination by blowing out with compressed air. By removing the
screw (48) and plastic cap (47) the filter elements can be removed for
cleaning. Re-assemble in reverse order.
2. Lubrication
Check the oil level regularly depending upon the operating hours. First oil
change after 500 operating hours (see oil drain plug (K)). Further changes
every 500-2000 operating hours. The oil change times should be shortened if
the application is dusty.
Only oils corresponding to DIN 51506 group VC/VCL or a synthetic oil (ob-
tainable from Rietschle) should be used. The viscosity must correspond to
ISO-VG 100 according to DIN 51519.
The recommended Rietschle Oil types are: MULTI-LUBE 100 (mineral oil);
SUPER-LUBE 100 (synthetic oil) (see oil type plate (M)).
When the oil is under a high thermal load, e.g. ambient or suction tempera-
tures over 30°C, unfavourable cooling or operating with increased speed etc.,
the oil change time can be extended by using the recommended synthetic oil.
Old and used oil must be disposed of corresponding with the
relevant health, safety and environmental laws.
If the oil brand is changed, the old oil must be drained completely from
the oil separator housing.
3. Oil separation (see E 182)
Extremely blocked oil mist separator will result in an increased
pump temperature and will cause discolouration of the lubricant.
The oil mist separator may become contaminated after a long period of
operation which can result in high pump temperature and motor overload. We
therefore recommend to change the oil mist separator every 2000 operating
hours. It is not possible to clean these elements.
Remove oil separator covers (37). Exchange the oil mist separator (33)
When refitting the oil mist separator (33) check for correct ori-
entation.
(the air entry opening must be positioned at the top half of the pump)
Trouble Shooting
1. Motor starter cuts out vacuum pump:
1.1 Check that incoming voltage and frequency corresponds with the motor
data plate.
1.2 Check the connections on the motor terminal block.
1.3 Incorrect setting on the motor starter.
1.4 Motor starter trips too fast.
Solution: Use a motor starter with a time delay trip (version as per IEC
947-4).
1.5 The vacuum pump or the lubricating oil is too cold.
1.6 The viscosity of lubricant is too high.
1.7 Oil mist eliminator element is blocked or contaminated.
1.8 Back pressure on the exhaust pipework is excessive.
2. Insufficient suction capacity:
2.1 Inlet filter is obscured.
2.2 Suction pipe work is too long or too small.
3. Vacuum pump does not reach ultimate vacuum:
3.1 Check for leaks on the suction side of the pump or on the system.
3.2 Viscosity of lubricant incorrect.
4. Vacuum pump operates at an abnormally high temperature:
4.1 Ambient or suction temperature too high.
4.2 Cooling air flow is restricted.
4.3 Problem as per 1.6, 1.7 and 1.8.
5. Exhausted air contains visible oil mist:
5.1 Oil mist separator or oil mist eliminator elements are fitted incorrectly.
5.2 Incorrect oil brand is used.
5.3 Problem as per 1.7, 1.8, 4.1 and 4.2.
6. Unit emits abnormal noise:
Note: A knocking noise from the rotor blades is normal when starting from
cold, as long as it disappears within two minutes with increasing operat-
ing temperature.
6.1 The pump cylinder is worn. Solution: send your complete unit off for
repair to the supplier or approved service agent.
6.2 Blades are damaged.
6.3 Problem as per 1.5 and 1.6.
7. Water in lubricant i.e. Emulsification:
7.1 Pump pulls in water because of the application.
Solution: Fit water separators on to the vacuum side.
7.2 Unit handles more water vapour than the gas ballast is designed for.
7.3 Pump operates only for a short time and does not reach normal operating
temperature.
Solution: Run the pump with closed suction until the oil has been cleaned.
Appendix:
Repair on Site: For all repairs on site an electrician must disconnect the motor
so that the unit can not be started accidentally.
All engineers are recommended to consult the original manufacturer or one of
the subsidiaries, agents or service agents. The address of the nearest repair
workshop can be obtained from the manufacturer on application.
After a repair or before re-installation follow the instructions as shown under
the headings "Installation and Initial Operation".
Storage: VVL units must be stored in dry ambient conditions with normal
humidity. If a pump needs to be stocked for a period longer than 3 months, we
would recommend using an anti-corrosion oil rather than the normal lubricant.
Disposal: The wearing parts (as listed in the spare parts lists) should be
disposed of with due regard to health and safety regulations.
Spare parts list: E 118 VVL 15
1.2001 / PM6