Related Manuals for BUSCH COBRA NF 0750 A
Summary of Contents for BUSCH COBRA NF 0750 A
- Page 1 COBRA Dry Screw Vacuum Pumps NF 0750 A, NF 0950 A Water-Cooled Version (WCV) Instruction Manual 0870232965 | -0003_en-US | Original instructions 11/24/2022...
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Page 2: Table Of Contents
Cleaning the Inlet Screen with Double Flange G2 ................Cleaning the Gas Ballast Filter (Optional)......................Oil Change................................Overhaul................................Decommissioning..............................10.1 Dismantling and Disposal ..........................Spare Parts................................Troubleshooting..............................Technical Data ..............................2 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en... - Page 3 Table of Contents Oil ................................... EU Declaration of Conformity..........................UK Declaration of Conformity ..........................Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en 3 | 44...
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Page 4: Safety
... indicates helpful tips and recommendations, as well as information for efficient and trou- ble-free operation. WARNING ... indicates a potentially dangerous situation related to the presence of an oxygen level of more than 21%. 4 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en... -
Page 5: Product Description
Plug for manual rotation of rotors Silencer Temperature switch NOTE Technical term. In this instruction manual, we consider that the term ‘machine’ refers to the ‘vacuum pump’. Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en 5 | 44... -
Page 6: Operating Principle
The machine is intended for the placement in a non-potentially explosive environment. The machine is capable of maintaining ultimate pressure, see Technical Data. The machine is suitable for continuous operation. Permitted environmental conditions, see Technical Data. 6 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en... -
Page 7: Start Controls
● Installation conditions: the installation area must be ventilated in such a way to prevent unaccept- able levels of oxygen, see Installation Conditions [➔ 12]. ● Use only a type of oil approved and recommended by Busch for oxygen applications, see Filling Oil [➔ 16] and Oil [➔ 41]. -
Page 8: Standard Features
21% (>21%). The barrier gas system allows the supply of compressed air or nitrogen into the motor side shaft seals to improve the sealing efficiency. 8 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en... -
Page 9: Inlet Filter
The inlet filter protects the machine against dust and other solids in the process gas. The inlet filter is available with a paper or polyester cartridge. Description Connection size: G3' Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en 9 | 44... -
Page 10: Transport
● Make sure that the eye bolt(s) (EB) is/are in faultless condition, fully screwed in and tightened by hand. ● Check the machine for transport damage. If the machine is secured to a base plate: ● Remove the machine from the base plate. 10 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en... -
Page 11: Storage
● Wrap the machine in a corrosion inhibiting film. ● Store the machine indoors, dry, dust free and if possible in original packaging preferably at temperatures between 5 ... 55 °C. Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en 11 | 44... -
Page 12: Installation
● Check the oil level, see Oil Level Inspection [➔ 28]. ● Make sure that the cooling water complies with the requirements, see Cooling Water Connection [➔ 14]. 12 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en... -
Page 13: Connecting Lines / Pipes
● Make sure that the counter pressure (also termed back pressure) at the discharge connection (OUT) does not exceed the maximum allowable discharge pressure, see Technical Data. Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en 13 | 44... -
Page 14: Cooling Water Connection
Chloride mg/l < 100 Electrical conductivity µS/cm ≤ 100 Free chloride mg/l < 0.3 Materials in contact with the cooling water Stainless steel and cast iron 14 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en... -
Page 15: Barrier Gas System Connection (Optional)
Maximum gas pressure Recommended pressure setting at the pres- bar(a) sure regulating valve (PRV) Filtration µm Recommended flow rate SLM (standard li- 15 ... 20 ter per minute) Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en 15 | 44... -
Page 16: Filling Oil
WARNING Process gas with > 21% vol. oxygen and use of an inappropriate oil. Risk of fire! ● Use only a type of oil approved and recommended by Busch for oxygen applications. NOTICE Use of an inappropriate oil. Risk of premature failure! Loss of efficiency! ●... - Page 17 Oil type see nameplate Change interval see instruction manual If there is no sticker (part no. 0565 568 959) on the machine: ● Order it from your Busch representative. Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en 17 | 44...
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Page 18: Electrical Connection
● If the machine is equipped with a power connector, install a residual current protective device to protect persons in case of isolation default. ● Busch recommends installing a type B residual protective device suitable for the electrical in- stallation. -
Page 19: Wiring Diagram Three-Phase Motor (Pump Drive)
● Connect the motor cables as shown in the below wiring diagram. NF 0950 A Delta connection (low voltage): Star connection (high voltage): Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en 19 | 44... - Page 20 ● Connect the motor temperature protection (Thermistors PTC. 3 x 155°C). ● Motor terminal box cable entries: ● 2 x M25 x 1.5 ● 1 x M16 x 1.5 20 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en...
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Page 21: Electrical Connection Of The Monitoring Devices
Electrical Connection | 6 Electrical Connection of the Monitoring Devices NOTE In order to prevent potential nuisance alarms, Busch recommends that the control system is configured with a time delay of at least 20 seconds. 6.3.1 Wiring Diagram Temperature Switch Part no.: 0651 563 762... -
Page 22: Commissioning
Operation without cooling liquid will ruin the machine in short time! ● Prior to commissioning, the machine must be filled with cooling liquid, see Filling Cooling Liquid. 22 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en... - Page 23 As soon as the machine is operated under normal operating conditions: ● Measure the motor current and record it as reference for future maintenance and trouble- shooting work. Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en 23 | 44...
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Page 24: Start Procedure
72Hz (NF 0950 A) Stop the machine Stop the machine Description Barrier gas flow: 15-20 SLM (Option) Cooling water supply: 8-16 l/min., 1-6 bar, 5-30°C Temperature switch 70°C 24 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en... -
Page 25: Shutdown Procedure
Stop the machine Ramp down time: 30 seconds Close barrier gas supply Close cooling water supply Machine off Description Pump inlet Barrier gas flow (Option) Cooling water supply Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en 25 | 44... -
Page 26: Maintenance
Machine contaminated with organic material. Risk of fire! If there is a suspicion that the machine and/or the oil are/is contaminated with organic material: ● The machine must be removed from service and cleaned by specialists (contact your Busch repre- sentative). WARNING Use of non-Busch genuine spare parts. - Page 27 Risk of injuries! Risk of premature failure and loss of efficiency! ● Maintenance work must only be executed by qualified personnel. ● Respect the maintenance intervals or ask your Busch representative for service. NOTICE Using inappropriate cleaners. Risk of removing safety stickers and protective paint! ●...
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Page 28: Maintenance Schedule
● Shut down the machine. ● When the machine is stopped, wait 1 minute before checking the oil level. ● Fill up if necessary, see Oil Filling [➔ 16]. 28 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en... -
Page 29: Cleaning The Inlet Screen
8.3.1 Cleaning the Inlet Screen with Vertical Flange G3 or DN100 Description Use a hexagonal key Use compressed air and wear protec- tive eyewear and mask Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en 29 | 44... -
Page 30: Cleaning The Inlet Screen With Horizontal Flange G3
8 | Maintenance 8.3.2 Cleaning the Inlet Screen with Horizontal Flange G3 Description Use compressed air and wear protec- tive eyewear and mask 30 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en... -
Page 31: Cleaning The Inlet Screen With Double Flange G2
Maintenance | 8 8.3.3 Cleaning the Inlet Screen with Double Flange G2 Description Use compressed air and wear protec- Max. admissible torque: 12Nm tive eyewear and mask Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en 31 | 44... -
Page 32: Cleaning The Gas Ballast Filter (Optional)
WARNING Process gas with > 21% vol. oxygen and use of an inappropriate oil. Risk of fire! ● Use only a type of oil approved and recommended by Busch for oxygen applications. NOTICE Use of an inappropriate oil. Risk of premature failure! Loss of efficiency! ●... - Page 33 Maintenance | 8 Description Magnetic plug Description Magnetic plug For oil type and oil capacity see Technical Data and Oil [➔ 41]. Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en 33 | 44...
- Page 34 Oil type see nameplate Change interval see instruction manual If there is no sticker (part no. 0565 568 959) on the machine: ● Order it from your Busch representative. 34 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en...
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Page 35: Overhaul
● Decontaminate the machine as much as possible and state the contamination status in a ‘Dec- laration of Contamination’. Busch will only accept machines that come with a completely filled in and legally binding signed ‘Declaration of Contamination’ (form downloadable from www.buschvacuum.com). -
Page 36: Decommissioning
● Make sure that no oil drips onto the floor. ● Separate special waste from the machine. ● Dispose of special waste in compliance with applicable regulations. ● Dispose of the machine as scrap metal. 36 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en... -
Page 37: Spare Parts
Risk of premature failure! Loss of efficiency! ● The exclusive use of Busch genuine spare parts and consumables is recommended for the correct functioning of the machine and to validate the warranty. There are no standard spare parts kits available for this product. -
Page 38: Troubleshooting
● Use one of the recommend- able oil type. ed oils in the correct quanti- ty, see Oil [➔ 41]. Defective gears, bearings or ● Repair machine (contact coupling element. Busch). 38 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en... - Page 39 The machine runs too hot. ● See problem "The machine runs too hot". For resolution of problems not listed in the troubleshooting table, please contact your Busch repre- sentative. Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en...
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Page 40: Technical Data
Oil capacity - suction side qts. 1.05 Weight approx. Lbs. 1765 * Performance could be reduced by using 2 x G2 inlet flange or inlet filter. 40 | 44 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en... - Page 41 0831 108 879 Oil for standard service (Oxygen ≤ 21% vol.) VSL 100 ISO-VG Part number 1 L packaging 0831 122 573 Part number 5 L packaging 0831 122 572 Instruction Manual COBRA NF 0750 A - NF 0950 A WCV_EN_en 41 | 44...
- Page 42 EU Declaration of Conformity This Declaration of Conformity and the CE-markings affixed to the nameplate are valid for the machine within the Busch scope of delivery. This Decla- ration of Conformity is issued under the sole responsibility of the manufacturer.
- Page 43 UK Declaration of Conformity This Declaration of Conformity and the UKCA-markings affixed to the nameplate are valid for the machine within the Busch scope of delivery. This Dec- laration of Conformity is issued under the sole responsibility of the manufacturer.
- Page 44 With a network of over 60 companies in more than 40 countries and agencies worldwide, Busch has a global presence. In every country, highly competent local personnel delivers custom-tailored support backed by a global network of expertise. Wherever you are.