BUSCH COBRA NX 0950 A WCV Instruction Manual
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BUSCH COBRA NX 0950 A WCV Instruction Manual

Dry screw vacuum pumps, water-cooled version
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COBRA
Dry Screw Vacuum Pumps
NX 0950 A Water-Cooled Version (WCV)
Instruction Manual
0870222540 | -0003_en-US | Original instructions
10/27/2022

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Summary of Contents for BUSCH COBRA NX 0950 A WCV

  • Page 1 COBRA Dry Screw Vacuum Pumps NX 0950 A Water-Cooled Version (WCV) Instruction Manual 0870222540 | -0003_en-US | Original instructions 10/27/2022...

  • Page 2: Table Of Contents

    Table of Contents Table of Contents Safety..................................Product Description ............................. Operating Principle ............................. Intended Use ............................... Start Controls ............................... Standard Features............................... 2.4.1 Water Cooling............................2.4.2 Temperature Switch ..........................2.4.3 Sealing Systems............................. Optional Accessories............................2.5.1 Gas Ballast Valve ........................... 2.5.2 Silencer ..............................2.5.3 Barrier Gas System ..........................
  • Page 3 Table of Contents Technical Data ..............................Oil ................................... EU Declaration of Conformity..........................UK Declaration of Conformity ..........................Instruction Manual COBRA NX 0950 A WCV_EN_en 3 | 44...

  • Page 4: Safety

    Safety Prior to handling the machine, this instruction manual should be read and understood. If anything needs to be clarified, please contact your Busch representative. Read this manual carefully before use and keep for future reference. This instruction manual remains valid as long as the customer does not change anything on the product.

  • Page 5: Product Description

    Product Description | 2 Product Description IN, IS Description Suction connection (Inlet) Discharge connection (Outlet) Barrier gas connection Barrier gas flow meter Barrier gas manometer Barrier gas pressure regulator Condensate drain Cooling water drain plug Cooling water inlet Cooling water outlet Eye bolt Gas ballast valve Gas ballast silencer...

  • Page 6: Operating Principle

    Conveying of other media leads to an increased thermal and/or mechanical load on the machine and is permissible only after a consultation with Busch. The machine is intended for the placement in a non-potentially explosive environment. The machine is capable of maintaining ultimate pressure, see Technical Data.

  • Page 7: Start Controls

    ● Check if the process gases are compatible with those following materials: - Cast iron - Steel - Fluoroelastomer (FKM/FPM) ● In doubt, please contact your Busch representative. Start Controls The machine is equipped with a variable speed drive. Standard Features 2.4.1...

  • Page 8: Inlet Filter

    In order to avoid reverse rotation after switching off, the machine can be equipped with an inlet check valve. The inlet check valve also prevents fast venting of the connected vacuum system. The inlet check valve can also be equipped with a pressure sensor (please contact your local Busch representative for further information). Description...

  • Page 9: Transport

    Transport | 3 Transport WARNING Suspended load. Risk of severe injury! ● Do not walk, stand or work under suspended loads. WARNING Lifting the machine using the motor eye bolt. Risk of severe injury! ● Do not lift the machine using the eye bolt fitted to the motor. Only lift the machine as shown. NOTICE In case the machine is already filled with oil.
  • Page 10 3 | Transport Description Minimum length: 400 mm Minimum length: 400 mm ● 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 NX 0950 A WCV_EN_en...

  • Page 11: Storage

    Storage | 4 Storage ● Seal all apertures with adhesive tape or reuse provided caps. NOTICE Long storage time. Risk of damage to the machine! ● Due to a long storage time the capacitors of the variable speed drive can lose efficiency because of electrochemical processes.

  • Page 12: Installation

    ● Make sure that the cooling water complies with the requirements, see Cooling Water Connection [➔ 15]. If the machine is installed at an altitude greater than 1000 meters above sea level: ● Contact your Busch representative, the motor should be derated or the ambient temperature limited. 12 | 44...

  • Page 13: Connecting Lines / Pipes

    – ISO DN100, DIN 28404 If the machine is used as part of a vacuum system: ● Busch recommends the installation of an isolation valve in order to prevent the machine from turning backwards. Instruction Manual COBRA NX 0950 A WCV_EN_en...

  • Page 14: Discharge Connection

    5 | Installation 5.2.2 Discharge Connection Description Discharge variants (without silencer) NOTICE Discharge gas flow obstructed. Risk of damage to the machine! ● Make sure that the discharged gas will flow without obstruction. Do not shut off or throttle the discharge line or use it as a pressurized air source.

  • Page 15: Cooling Water Connection

    Installation | 5 5.2.3 Cooling Water Connection Description Cooling water inlet Cooling water outlet ● Connect the cooling water connections (CWI / CWO) to the water supply. Connection size: – G1/2, ISO 228-1 (CWI / CWO) ● Make sure that the cooling water complies with the following requirements: Supply capacity l/min 8 ... 16...

  • Page 16: Barrier Gas System Connection (Optional)

    5 | Installation NOTE Water hardness unit conversion. 1 mg/l (ppm) = 0.056 °dh (german degree) = 0.07 °e (english degree) = 0.1 °fH (french degree) 5.2.4 Barrier Gas System Connection (Optional) Description Barrier gas connection Flow meter Manometer Pressure regulating valve ●...

  • Page 17: Filling Oil

    Risk of premature failure! Loss of efficiency! ● Only use an oil type which has previously been approved and recommended by Busch. For oil type and oil capacity see Technical Data and Oil [➔ 39]. Instruction Manual COBRA NX 0950 A WCV_EN_en...
  • Page 18 __ / __ / ____ 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. 18 | 44 Instruction Manual COBRA NX 0950 A WCV_EN_en...

  • Page 19: Electrical Connection

    ● Make sure that the motor of the machine will not be affected by electric or electro- magnetic dis- turbance from the mains, if necessary seek advice from Busch. ● Make sure that the EMC of the machine is compliant with the requirements of your supply net- work system, if necessary provide further interference suppression (EMC of the machine, see EU Declaration of Conformity [➔ 40] or UK Declaration of Conformity [➔ 41]).

  • Page 20: Machine Delivered With A Variable Speed Drive

    ● 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 21: Electrical Connection Of The Variable Speed Drive

    ● Make sure that the motor of the machine will not be affected by electric or electromagnetic dis- turbance from the mains; if necessary seek advice from Busch. ● Remove the cover from the variable speed drive. The cover is connected to the PE terminals with a PE cable.

  • Page 22: Wiring Diagram Variable Speed Drive (Vsd)

    6 | Electrical Connection Wiring Diagram Variable Speed Drive (VSD) CAUTION The machine can start immediately when power is supplied. Risk of inadvertent start-up! ● Make sure that a start-up will not lead to a dangerous situation. Description Motor already wired Connect PE Connect L1, L2, L3 22 | 44...

  • Page 23: Start / Stop Connection

    EMC cable fittings if required. ● These parameters can be changed according to the specific document “Pump Control Instruc- tions, art. no.: 0870208958”. Contact your local Busch agency or your Busch representative to check if your machine is a custom or a standard one.

  • Page 24: Electrical Connection Of The Monitoring Devices

    ● Switch any two of the motor phase wires. 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. 6.6.1 Wiring Diagram Temperature Switch Part no.: 0651 563 762...

  • Page 25: Commissioning

    Commissioning | 7 Commissioning CAUTION During operation the surface of the machine may reach temperatures of more than 70°C. Risk of burns! ● Avoid contact with the machine during and directly after operation. CAUTION Noise of running machine. Risk of damage to hearing! If persons are present in the vicinity of a non noise insulated machine over extended periods: ●...

  • Page 26: Conveying Condensable Vapors

    (e.g. "dead leg") with drain. ● Water vapor within the gas flow is tolerated within certain limits. The conveyance of other vapors shall be agreed upon with Busch. 26 | 44 Instruction Manual COBRA NX 0950 A WCV_EN_en...

  • Page 27: Maintenance

    Maintenance | 8 Maintenance DANGER Live wires. Risk of electrical shock. ● Electrical installation work must only be executed by qualified personnel. DANGER Maintenance work without disconnecting the variable speed drive. Risk of electrical shock. ● Disconnect and isolate the variable speed drive before attempting any work on it. High voltages are present at the terminals and within the variable speed drive for up to 10 min- utes after disconnection of the electrical supply.

  • Page 28: Maintenance Schedule

    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! ●...

  • Page 29: Oil Level Inspection

    ● Change the oil of the gear and bearing housings (both sides), see Oil Change [➔ 30]. ● Clean the magnetic plugs (MP). Every 25000 hours or after 4 ● Have a major overhaul on the machine (contact Busch). years Oil Level Inspection ● Shut down the machine.

  • Page 30: Cleaning The Gas Ballast Filter (Optional)

    Oil Change NOTICE Use of an inappropriate oil. Risk of premature failure! Loss of efficiency! ● Only use an oil type which has previously been approved and recommended by Busch. 30 | 44 Instruction Manual COBRA NX 0950 A WCV_EN_en...
  • Page 31 Maintenance | 8 Description Magnetic plug Description Magnetic plug For oil type and oil capacity see Technical Data and Oil [➔ 39]. Instruction Manual COBRA NX 0950 A WCV_EN_en 31 | 44...
  • Page 32 __ / __ / ____ 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. 32 | 44 Instruction Manual COBRA NX 0950 A WCV_EN_en...

  • Page 33: 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 34: Decommissioning

    10 | Decommissioning Decommissioning DANGER Live wires. Risk of electrical shock. ● Electrical installation work must only be executed by qualified personnel. CAUTION Hot surface. Risk of burns! ● Prior to any action requiring touching the machine, let the machine cool down first. ●...

  • Page 35: Spare Parts

    Use of non-Busch genuine 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. Spare parts available:...

  • Page 36: Troubleshooting

    Solid foreign matter has en- ● Remove the solid foreign tered the machine. matter or repair the ma- chine (contact Busch). ● Check the inlet screen (IS) at the suction connection. The temperature switch (TS) ● Let the machine cool down.
  • Page 37 Oil Change [➔ 30]. The machine runs too hot. ● See problem "The machine runs too hot". For the solution of problems not mentioned in the troubleshooting chart contact your Busch repre- sentative. Instruction Manual COBRA NX 0950 A WCV_EN_en 37 | 44...
  • Page 38 13 | Technical Data Technical Data NX 0950 A WCV Pumping speed (72Hz) m³/h ACFM Ultimate pressure hPa (mbar) abs. ≤0.01 (without gas ballast) TORR ≤0.0075 Ultimate pressure hPa (mbar) abs. ≤0.05 (with gas ballast) TORR ≤0.0375 Nominal motor rating 18.5 Nominal motor speed (72Hz) 4320...
  • Page 39 Oil | 14 VSC 100 ISO-VG Part number 1 L packaging 0831 168 356 Part number 5 L packaging 0831 168 357 Instruction Manual COBRA NX 0950 A WCV_EN_en 39 | 44...
  • Page 40 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 41 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 42 Notes 42 | 44 Instruction Manual COBRA NX 0950 A WCV_EN_en...
  • Page 43 Instruction Manual COBRA NX 0950 A WCV_EN_en 43 | 44...
  • 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.

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