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If the vacuum pump is equipped with a system shut-off valve at the
inlet:

u

Close the system shut-off valve

u

Apply inlet pressure between atmospheric pressure and 650
hPa (abs.) in order to guarantee that the outlet gas tempera-
ture will not exceed 80°C.

l

Close the injection of cooling liquid (INJ) in the cylinder

u

Let the vacuum pump run for 1 minute

l

Stop the vacuum pump

l

Close the cooling liquid supply (CL)

l

The system must be disconnected from the power supply

Re-start procedure following an Emergency Shut Down
of the system

Prior to attempting to restart the system, ascertain the reason for the
emergency shut down and rectify the fault.

u

With the pump electrically isolated from the power supply and
vacuum system, all appropriate safety precautions, work per-
mits, warning boards, safety equipment and perimeter must be
put into place.

u

Drain and collect any residual liquids from the pumping cham-
ber, in compliance with all local restrictions and requirements.
Ensure the pump is free to rotate by hand. Once assured that
the pump is empty, replace all previously removed drain plugs.

When the work has been completed follow the procedure "Start-up
procedure after maintenance"

l

Remove the warning board and safety perimeter

l

Check the lubrication oil levels according to chapters "Checking
the oil level"

l

Connect the pump to the power supply

l

Make sure that the "Installation Prerequisites" are followed

l

Open the cooling liquid supply (CL)

l

Start the vacuum pump

l

Open the injection cooling liquid into the cylinder (INJ), adjust the
flow rate to the required amount to maintain the pump outlet tem-
perature <80°C.

Maintenance

DANGER

In case the vacuum pump has conveyed gases that have been
contaminated with foreign materials that are dangerous to health,
the oil and condensates will also be contaminated.

These foreign materials can infiltrate the pores, recesses and other
internal spaces of the vacuum pump.

Danger to health when the vacuum pump is dismantled.

Danger to the environment.

Always wear protective clothing when carrying out maintenance
work.

Before any maintenance work, the inlet and outlet piping as well as
the vacuum pump itself must be flushed with nitrogen.

General information

Please follow the comments and recommendations given below:

WARNING

The inside of the vacuum pump must regularly be checked for de-
posits and be cleaned as and when necessary, for example by pur-
ging the pump. Deposits can cause friction and sparks inside the
pump, which must be avoided under all circumstances. Danger of
explosion!

Control points exist at the inlet and outlet of the vacuum pump.
For better control, the use of endoscopes is recommended.

DANGER

Any intervention on the pump must be carried out under scupu-
lous observation of the applicable safety regulations, and must
only be executed by qualified and trained personnel. If dangerous
substances of any kind are present, the operator must imperatively
inform the personnel charged with the maintenance and give them
the necessary instructions before work can begin.

Prior to any intervention on the pump, it is important to make sure
that there is no risk coming from processed substances or other
substances inside or outside the pump for the personnel charged
with maintenance.

WARNING

Opening the vacuum pump is only authorised after it has stopped,
and in absence of explosive atmospheres.

WARNING

The bearings must be changed every 16’000 operating hours, be-
cause damage to the bearings would increase the risk of explosion.

All other assembly, repair or maintenance work must be carried out by
specialised mechanics of the BUSCH After Sales Service.

The electrical installation

must be controlled every 8’000 operating

hours for correct operation and possible damage. This also includes the
monitoring system of the vacuum pump and the potential equaliser.

NOTE:

This maintenance procedure is not obligatory if the vacuum

pump is not used for drawing explosive gases or vapours. However, it
can be carried out if the operator believes it to be necessary.

CAUTION

Only authorised personnel may carry out any dismantling on the va-
cuum pump. Before work begins, the operator of the vacuum pump
must fill in a form or a “Declaration Regarding Contamination of
Vacuum Equipment and Components” that provides information on
possible dangers and appropriate measures.
If this form has not been filled in completely and signed by a res-
ponsible person, the vacuum pump may not be dismantled.

CAUTION

Before any maintenance work is started, a safety perimeter of at
least 1 [m] around the machine must be set up.

CAUTION

During operation the surface of the vacuum pump may reach tem-
peratures in excess of 70 °C.

Risk of burns!

Maintenance
Page 14

Summary of Contents for COBRA AC 1000 F

Page 1: ...e Instructions Screw Vacuum Pumps COBRA AC 1000 F VR Vapour Recovery ATEX version II 2G i o IIB T4 X Ateliers Busch S A Zone industrielle 2906 Chevenez Switzerland 0870561056 180809 Original instructi...

Page 2: ...First start up of the system 13 Switching off the system 13 Re start procedure following an Emergency Shut Down of the system 14 Maintenance 14 General information 14 Maintenance program 15 Weekly 15...

Page 3: ...g liquid inlet connection CLO Cooling liquid outlet connection OFP Oil filler plug OSG Oil sight glass ODV Oil drain ball valve MP Magnetic plug DV1 Ventilation G1 4 DV2 Aeration valve CLD Cooling liq...

Page 4: ...g liquid injection in the cylinder The COBRA vacuum pumps the principle of screw pumps Two parallel screws RT rotate in opposite directions in the pump body Entering gases are trapped between the pitc...

Page 5: ...l accordingly Local regulations regarding the motors and electric control elements must be observed when installing the pump in potentially explosive environments The maintenance instructions must be...

Page 6: ...careful packing Check the packaging for transport damage when the goods arrive The pump can withstand temperatures between 25 C and 55 C during transport Transportation of packaged pump Packed on a p...

Page 7: ...pe corresponds to the ambient conditions see Oil type Ambient pressure atmospheric Humidity range 20 to 95 Altitude up to 1000 m l Make sure that the cooling liquid fulfills the following require ment...

Page 8: ...scharge lines the line cross section should be larger than the exhaust flange in order to prevent a drop in the performance of the vacuum pump If you have any doubts contact your Busch representative...

Page 9: ...or PSA 0301 The sensor must be connected in such a way that the vacuum pump stops when the counter pressure reaches the value prescribed in the COBRA ATEX catalogue Technical data of the standard prod...

Page 10: ...meter FSA 0502 The contact flow meter must be connected in such a way that the vacuum pump stops when the flow drops below 2 l min It is possible to run the vacuum pump with an injection liquid flow o...

Page 11: ...talogue If the unit motor coupling hub is already fitted u Move the coupling hubs on the shafts in order to reach value E see COBRA ATEX catalogue l Lock the coupling hubs by tightening the set screws...

Page 12: ...t the cooling liquid inlet CLI and outlet CLO connections l Open the cooling liquid supply l Adjust the cooling liquid flow to 12 l min Connection of the injection liquid into the cylinder INJ NOTE Ma...

Page 13: ...e that the Installation Prerequisites are complied with and will remain so and ensure that adequate cooling is guaranteed If the pump is shut down for a longer period of time CAUTION If there is a ris...

Page 14: ...ations given below WARNING The inside of the vacuum pump must regularly be checked for de posits and be cleaned as and when necessary for example by pur ging the pump Deposits can cause friction and s...

Page 15: ...eaks have the vacuum pump repaired Busch service l Check the vacuum pump for cooling liquid leaks in case of leaks have the vacuum pump repaired Busch service In case of operation in a dusty environme...

Page 16: ...ler plugs OFP l Top up with oil l Make sure that the oil level is on MAX mark of the oil sight glass l Make sure that the seal of the oil filler plug are not damaged and replace plug if necessary l Re...

Page 17: ...ing liquid in compliance with applicable re gulations Checking the current consumption l Check the current of the motor An increased current indicates a fault see Troubleshooting Checking the motor ho...

Page 18: ...es must be disposed of separately in compliance with applicable environmental regulations When the vacuum pump comes to the end of its life it must be decontaminated CAUTION Only authorised personnel...

Page 19: ...artial clogging in the suction discharge or pressure line Remove the clogging Long suction discharge or pressure line with too small diameter Use larger diameter Internal parts worn or damaged Repair...

Page 20: ...ral weeks or months Let the vacuum pump run warm with inlet closed Oil viscosity is too high for the ambient tempe rature Use oil with a better viscosity class Improper oil quantity unsuitable oil typ...

Page 21: ...ge intervals are too long The oil was overheated Drain oil Fill in new oil see Maintenance In case the oil life is too short use oil with better heat resistance or retrofit cooling Cooling liquid flow...

Page 22: ...1 0486000766 510 O ring 2 0486511445 511 O ring 1 0486000645 512 O ring 2 0486000526 513 O ring 2 0486000636 514 O ring 2 0486000538 515 Shaft seal 1 0487553116 516 Seal 2 0486511080 732 Flat seal 1 0...

Page 23: ...ellus S2 V 68 High Performance hydraulic oil viscosity class ISO HC 68 20 60 C TOTAL AZOLLA ZS 68 viscosity class ISO VG 68 Oil quantity The quantity of oil specified in the following table is of info...

Page 24: ...l motor speed 50 Hz 60 Hz min 1 min 1 3000 3600 Noise level EN ISO 2151 50 Hz 60 Hz dB A dB A 83 85 Ambient temperature C 20 40 Ambient temperature high temperature version refer to the pump nameplate...

Page 25: ...tances to prevent hazard zones being reached by the upper and lower limbs EN 1012 1 2010 EN 1012 2 1996 A1 2009 Compressors and vacuum pumps Safety requirements Part 1 and 2 EN ISO 2151 2008 Acoustics...

Page 26: ...Note...

Page 27: ...Note...

Page 28: ...Majang myun Icheon si Gyunggi do 467 813 Republic of Korea Phone 82 31 645 2700 Fax 82 31 631 2898 e mail busch busch co kr Malaysia Busch Malaysia Sdn Bhd 4 6 Jalan Taboh 33 22 Seksyen 33 Shah Alam T...

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