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Summary of Contents for BUSCH COBRA NC 2500 C
- Page 1 COBRA Dry Screw Vacuum Pumps NC 2500 C Water-Cooled Version (WCV) Instruction Manual 2000237207 | -0001_en-US | Original instructions 2025/02/20...
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Page 2: Table Of Contents
Stop & Start ............................7.1.3 Use with Argon ............................. Conveying Condensable Vapors........................Maintenance ................................. Maintenance Schedule ............................Oil Level Inspection............................. Cooling Liquid Level Inspection ........................Oil Change................................Cooling Liquid Change ............................2 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en... - Page 3 Overhaul ................................Decommissioning ..............................10.1 Dismantling and Disposal ..........................Spare Parts ................................Troubleshooting ..............................Technical Data ..............................Cooling Liquid ............................... Oil ................................... EU Declaration of Conformity ..........................UK Declaration of Conformity..........................Instruction Manual COBRA NC 2500 C WCV_EN_en 3 | 52...
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Page 4: Safety
... indicates a potentially dangerous situation that could result in damage to property. NOTE ... indicates helpful tips and recommendations, as well as information for efficient and trou- ble-free operation. 4 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en... -
Page 5: Product Description
Silencer (Option) Thermometer TSA1 Resistance thermometer (Cooling liquid TSA2 Resistance thermometer (Exhaust gas tem- temperature) perature) Thermostatic valve * For additional cooling liquid drain plugs (CLD), see Cooling Liquid Change [➔ 37]. Instruction Manual COBRA NC 2500 C WCV_EN_en 5 | 52... -
Page 6: Operating Principle
The machine is intended for 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 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en... -
Page 7: Start Controls
This unit is composed of a vibration sensor (SA) and a diagnostic electronics VSE100 (delivered loose). The machine must be stopped when the vibration limit value (preset at the factory) is reached. For more information, see Wiring Diagram Vibration Diagnostic Unit (Option) [➔ 27]. Instruction Manual COBRA NC 2500 C WCV_EN_en 7 | 52... -
Page 8: Mechanical Seals
● Oil lubricated single mechanical seals on the motor side and labyrinth seals on the inlet side. ● Oil lubricated single mechanical seals on the motor side and inlet side. 8 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en... -
Page 9: Transport
● To find out the weight of the machine, refer to the chapter Technical Data or the nameplate (NP). ● Make sure that the eye bolt(s) (EB) is/are in faultless condition, fully screwed in and tightened by hand. Instruction Manual COBRA NC 2500 C WCV_EN_en 9 | 52... - Page 10 = ~430 mm lifting the machine! l2 & l3 = ~650 mm Transport with a forklift Description Handling access must be from the un- derneath of the base frame 10 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en...
- Page 11 Transport | 3 ● Check the machine for transport damage. If the machine is secured to a base plate: ● Remove the machine from the base plate. Instruction Manual COBRA NC 2500 C WCV_EN_en 11 | 52...
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Page 12: Storage
Use the standard pump oil, see chapter Oil [➔ 49]. ● Before restarting the machine , drain the oil to the normal oil level, see “Oil draining” in chapter Oil Change [➔ 34]. 12 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en... -
Page 13: Installation
If the machine is installed at an altitude greater than 1000 meters above sea level: ● Contact your manufacturer representative, the motor must be derated or the ambient tem- perature limited. Instruction Manual COBRA NC 2500 C WCV_EN_en 13 | 52... -
Page 14: Connecting Lines / Pipes
ANSI 150, 6” If the machine is used as part of a vacuum system: ● Busch recommends the installation and use of an isolation valve to prevent the machine from running backwards. ● Busch also recommends not opening the isolation valve until at least the minimum machine speed has been reached. -
Page 15: Discharge Connection
Cooling water inlet Cooling water outlet Plate heat exchanger ● Connect the cooling water connections (CWI / CWO) to the water supply. Connection size: – G ½”, ISO 228-1 (CWI / CWO) Instruction Manual COBRA NC 2500 C WCV_EN_en 15 | 52... -
Page 16: Barrier Gas System Connection
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 Without nitrogen panel Description Barrier gas connection Flow meter Flow regulator Manometer Pressure regulating valve 16 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en... -
Page 17: Filling Oil
Loss of efficiency! ● Use only a type of oil previously approved and recommended by the manufacturer. For oil type and oil capacity see Technical Data and Oil [➔ 49] chapters. Instruction Manual COBRA NC 2500 C WCV_EN_en 17 | 52... - Page 18 ● Write down the oil change date on the sticker. If there is no sticker (part no. 0565 568 959) on the machine: ● Order it from your Busch representative. 18 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en...
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Page 19: Filling Cooling Liquid
For cooling liquid type and cooling liquid capacity see Technical Data and Cooling Liquid [➔ 48]. Description Cooling liquid vent plug (CLV1) Fill up to the top of the vent orifice (CLV1) Description Resume cooling liquid filling Instruction Manual COBRA NC 2500 C WCV_EN_en 19 | 52... -
Page 20: Fitting The Coupling
● When the coupling adjustment is done, lock the coupling hub by tightening the radial screw. For further coupling information, go to www.samiflex.se and download the instruction manual of the Samiflex ® coupling. 20 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en... -
Page 21: Fitting The Cooling Gas Filter Pressure Differential Gauge
The pressure differential gauge (PDG) is delivered loose with the machine. ● Install the gauge on the cooling gas unit (CGU) as follows: Description Cooling gas unit Pressure differential gauge (Delivered loose) Reduction (1/4" - 1/8") Instruction Manual COBRA NC 2500 C WCV_EN_en 21 | 52... -
Page 22: Electrical Connection
● Make sure that the motor of the machine will not be affected by electric or electromagnetic dis- turbance from the mains. If necessary, contact your Busch representative for more information. ● 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 [➔ 50] or UK Declaration of Conformity [➔ 51]). -
Page 23: Machine Delivered Without Variable Speed Drive
● If the machine is equipped with a power connector, install a residual current protective device to protect persons in case of a defective insulation. ● Busch recommends installing a type B residual protective device suitable for the electrical in- stallation. -
Page 24: Wiring Diagram Three-Phase Motor (Pump Drive)
● Watch the fan wheel of the motor and determine the direction of rotation just before the fan wheel stops. If the rotation of the motor must be changed: ● Switch any two of the motor phase wires. 24 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en... -
Page 25: Electrical Connection Of The Cooling Liquid Pump
● Make sure that the cooling liquid pump is connected such that is running when the machine is started. 6.3.1 Wiring Diagram Cooling Liquid Pump 230/400 VAC cooling liquid pump version Delta connection (low voltage): Star connection (high voltage): Instruction Manual COBRA NC 2500 C WCV_EN_en 25 | 52... -
Page 26: Electrical Connection Of The Monitoring Devices
Another sensor type. Risk of severe injury! Risk of explosion! ● Only the following sensor type(s) has (have) been approved by Busch and it (they) cannot be re- placed by another one without authorization of the Busch representative. NOTE To prevent potential nuisance alarms, Busch recommends that the control system is config- ured with a time delay of at least 20 seconds. -
Page 27: Wiring Diagram Resistance Thermometer
24 V (100 mA) Output 2 24 V (100 mA) 24 V (100 mA) Output 1 analog signal 4-20 mA 4 to 15 mA >15 to 18 mA >18 mA Instruction Manual COBRA NC 2500 C WCV_EN_en 27 | 52... -
Page 28: Commissioning
● Adjust the barrier gas pressure and volume flow. ● Start the machine. ● Make sure that the maximum permissible number of starts does not exceed 6 starts per hour. Those starts should be spread within the hour. 28 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en... -
Page 29: Recommendations On Operation
Pumping of high Argon concentrations (up to 50-80% of Argon) requires additional limits of opera- tion: ● Rotational speed: max 50 Hz = 3000 min ● Gas inlet temperature: max. 80 °C. ● Cooling gas: air or nitrogen. ● Temperature monitoring: standard setting. Instruction Manual COBRA NC 2500 C WCV_EN_en 29 | 52... -
Page 30: Conveying Condensable Vapors
● Open the inlet valve. ● Perform the process. ● Close the inlet valve. ● Continuously drain condensate from the condensate drain plug (CD) of the silencer (SI) (Option- al). 30 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en... -
Page 31: Maintenance
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. Instruction Manual COBRA NC 2500 C WCV_EN_en 31 | 52... -
Page 32: Maintenance Schedule
Yearly ● Carry out a visual inspection and clean the machine from dust and dirt. ● Check the electrical connections and the monitoring devic- 32 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en... -
Page 33: Oil Level Inspection
● Make sure that the oil level is between the middle of the oil sight glass and 3mm above it. ● Fill up if necessary, see Filling Oil [➔ 17]. Cooling Liquid Level Inspection ● Stop the machine. ● Fill up if necessary, see Filling Cooling Liquid [➔ 19]. Instruction Manual COBRA NC 2500 C WCV_EN_en 33 | 52... -
Page 34: Oil Change
8 | Maintenance Oil Change NOTICE Use of inappropriate oil. Risk of premature failure! Loss of efficiency! ● Use only a type of oil previously approved and recommended by the manufacturer. 34 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en... - Page 35 Maintenance | 8 Description Magnetic plug Description Magnetic plug For oil type and oil capacity see Technical Data and Oil [➔ 49] chapters. Instruction Manual COBRA NC 2500 C WCV_EN_en 35 | 52...
- Page 36 ● Write down the oil change date on the sticker. If there is no sticker (part no. 0565 568 959) on the machine: ● Order it from your Busch representative. 36 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en...
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Page 37: Cooling Liquid Change
Cooling Liquid Change NOTICE Cooling liquid draining. Risk of substantial cooling liquid flow! ● Make sure to place sufficiently large drain pans under the machine before removing the cooling liquid drain plugs. Instruction Manual COBRA NC 2500 C WCV_EN_en 37 | 52... - Page 38 8 | Maintenance Description Additional cooling liquid draining Bottom view of the machine points (x3) 38 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en...
- Page 39 Maintenance | 8 Description Additional cooling liquid draining point Description Additional cooling liquid draining point Instruction Manual COBRA NC 2500 C WCV_EN_en 39 | 52...
- Page 40 For cooling liquid type and cooling liquid capacity see Technical Data and Cooling Liquid [➔ 48]. Description Cooling liquid vent plug (CLV1) Fill up to the top of the vent orifice (CLV1) 40 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en...
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Page 41: Calibration Procedure Of The Electrical Devices
Zone Industrielle CH-2906 Chevenez – Switzerland info@busch.ch ● Reassemble the vibration sensor on the machine (8Nm). ● Perform a test of the control loop by disconnecting output 1 and 2. Instruction Manual COBRA NC 2500 C WCV_EN_en 41 | 52... -
Page 42: Overhaul
● Decontaminate the machine as much as possible and state the contamination status in a ‘Declaration of Contamination’. The manufacturer will only accept machine accompanied by a signed, fully completed and legally binding "declaration of contamination", downloadable from the following link: buschvacuum.com/ declaration-of-contamination. 42 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en... -
Page 43: Decommissioning
● Make sure that no cooling liquid 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. Instruction Manual COBRA NC 2500 C WCV_EN_en 43 | 52... -
Page 44: Spare Parts
Risk of premature failure! Loss of efficiency! ● Use only Busch genuine spare parts, consumables and supplies to ensure correct operation of the machine and to validate the warranty. There are no standard spare parts kits available for this product. -
Page 45: Troubleshooting
● Repair the machine. remaining condensate. ● Check the process and fol- low the recommendation in case of Conveying Condens- able Vapours. The motor is defective. ● Replace the motor. Instruction Manual COBRA NC 2500 C WCV_EN_en 45 | 52... - Page 46 Oil Change [➔ 34]. The machine runs too hot. ● See problem "The machine runs too hot". For resolution of problems not listed in the troubleshooting table, contact your Busch representa- tive. 46 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en...
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Page 47: Technical Data
See Cooling Water Connection [➔ 15] Oil capacity - Motor side Oil capacity - Inlet side Cooling liquid capacity approx. Weight approx. 2500 * Refer to chapter Cooling Water Connection [➔ 15]. Instruction Manual COBRA NC 2500 C WCV_EN_en 47 | 52... -
Page 48: Cooling Liquid
Part number 5 L packaging 0831 563 469 Part number 20 L packaging 0831 238 761 Zitrec ® M-25 coolant (Cooling liquid) is ready-to-use and requires no additional water. For more information, visit www.arteco-coolants.com. 48 | 52 Instruction Manual COBRA NC 2500 C WCV_EN_en... -
Page 49: Oil
Oil type Synthetic Part number 1 L packaging 0831 168 356 Part number 5 L packaging 0831 168 357 Part number 10 L packaging 0831 210 162 Part number 20 L packaging 0831 168 359 Instruction Manual COBRA NC 2500 C WCV_EN_en 49 | 52... -
Page 50: Eu Declaration Of Conformity
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 51: Uk Declaration Of Conformity
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 52 BUSCH GROUP The Busch Group is one of the world’s largest manufacturers of vacuum pumps, vacuum systems, blowers, compressors and gas abatement systems. Under its umbrella, the group houses two well-known brands: Busch Vacuum Solutions and Pfeiffer Vacuum+Fab Solutions. Together, they offer solutions to a wide range of industries.
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