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Pfeiffer COBRA DS 3141 A Instruction Manual

Dry screw vacuum pumps
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COBRA
Dry Screw Vacuum Pumps
DS 3141 A
Instruction Manual
2000247363 | -_en-US | Original instructions
2025/02/25

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Summary of Contents for Pfeiffer COBRA DS 3141 A

  • Page 1 COBRA Dry Screw Vacuum Pumps DS 3141 A Instruction Manual 2000247363 | -_en-US | Original instructions 2025/02/25...

  • Page 2: Table Of Contents

    Table of Contents​ Table of Contents Preface ................................... Congratulations on your purchase ........................Product Description ............................. COBRA DS 3141 A ..............................Use ..................................Operating Principle ............................. 2.3.1 COMBI ..............................2.3.2 Gas Flow Checks ........................... Oil Circuit................................Cooling.................................. Nitrogen System..............................Optional Functions/ Use of Available Accessories ..................
  • Page 3 Table of Contents 6.1.7 Electrical Connection/ Checks ......................Installation ................................6.2.1 Mounting ............................... 6.2.2 Electrical Connection..........................6.2.3 Equipment Connections (with Options)..................... 6.2.4 Connection of Lines/ Pipes ........................6.2.5 Oil Filling ..............................6.2.6 Cooling Liquid Filling..........................6.2.7 Direct Cooling Checking ........................6.2.8 Nitrogen Supply Checking........................

  • Page 4: Preface

    1 | Preface​ Preface Congratulations on your purchase Congratulations on your purchase of COBRA DS 3141 A vacuum pump. With watchful observation of the field’s requirements, innovation and steady development, we deliver modern vacuum and pres- sure solutions worldwide. These operating instructions contain information for ●...

  • Page 5: Product Description

    Product Description​ | 2 Product Description COBRA DS 3141 A OSG 2 OSG 3 OSG 1 Description Inlet connection Discharge connection Cooling water connections Nitrogen connections Emergency stop button Electrical connections Extracting ventilator Lifting eye bolt Handpad Main switch OSG 1...
  • Page 6 2 | Product Description​ OSG 4 TS 1 CWR 1 CWR 2 CWM 2 CWM 1 OSG 2 DGR 2 DGR 1 CLD OSG 3 TS 3 VSD 1 VSD 2 OSG 1 Description Cooling liquid drain plug Cooling liquid sight glass Cooling water connections CWM 1 Cooling water flow meter...
  • Page 7 Product Description​ | 2 Process Gas Diagram Description Process gas inlet Process gas outlet Cooling liquid pump (CLP) Cooling liquid glass (CLG) Cooling liquid temperature sensor (TS Cooling water inlet Cooling water regulating valve (CWR 1) Cooling water regulating valve (CWR 2) Cooling water flow meter (CWM 1) Cooling water switch (CWM 2) Cooling water outlet...
  • Page 8 2 | Product Description​ COBRA NS 0350 A Description Inlet Outlet Barrier gas Cooling liquid Cooling water Intake medium Motor klixon Screw rotors PUMA WY 3600 A Description Inlet Outlet Booster lobe Cooling water 8 | 64 Instruction Manual COBRA DS 3141 A_EN_en...

  • Page 9: Use

    2.3.1 COMBI The COBRA DS 3141 A vacuum pumps are a combination of a screw vacuum pump NS 0350 A (DP) and a Booster vacuum pump WY 3600 A (MB). The COMBI vacuum pumps are streamlined. The COBRA DS vacuum pumps are COBRA NS screw vacuum pumps with cooling water and nitrogen circuits.

  • Page 10: Gas Flow Checks

    2 | Product Description​ The WY 3600 A rotary lobes vacuum pumps are equipped with an automatic by-pass valve that limits the differential pressure between inlet and outlet. 2.3.2 Gas Flow Checks A pressure sensor TS 1 at the discharge monitors the discharge pressure. If the pressure reaches more than the limit value (alarm, preset at the factory: 0.2 bar), the purge cycle starts.

  • Page 11: Optional Functions/ Use Of Available Accessories

    Product Description​ | 2 Optional Functions/ Use of Available Accessories The relief valve (SV) prevents excessively high pressure in the expansion tank (EV), relief pressure: 6 bar. A pressure switch (optional) with normally closed contact mounted in the expansion tank monitors the pressure of the cooling liquid.

  • Page 12: Safety

    3 | Safety​ Safety Intended Use DEFINITION: To rule out any misunderstanding, the term “handling” of the vacuum pump covers transport, storage, installation, and operation of the pump as well as effects on operating states and troubleshooting on the vacuum pump. The vacuum pump is intended for industrial use.

  • Page 13: Safety Stickers

    Safety​ | 3 NOTE ... indicates helpful tips and recommendations, as well as information for efficient and trou- ble-free operation. CAUTION The COBRA DS system includes provision for the secondary containment of liquids leaks such as water and oil. Safety Stickers COBRA NS 0350 A Description Warning! Hot surface! Do not touch!

  • Page 14: Sound Pressure Emission

    3 | Safety​ COBRA DS 3141 A Sound Pressure Emission Refer to the table “Technical data [➔ 60]” for the permissible sound levelling free field conditions ac- cording to EN ISO 2151. CAUTION The sound level of the vacuum pump within a certain perimeter of the vacuum pump is high.

  • Page 15: Lock Out/ Tag Out Procedure (Type 1 Of Electrical Work)

    Safety​ | 3 Equipment is energized. Energized circuits are exposed and inadvertent contact with uninsulated energized parts is possible. Potential exposures are no greater than 30 volts rms, 42.4 volts peak, 60 volts dc or 240 volt-amp in dry locations. Type 4 Equipment is energized.

  • Page 16: Seismic Zone Installation

    3 | Safety​ Seismic Zone Installation Upon receipt, the vacuum pump is fixed on the transport pallet with two brackets. ● Convey the vacuum pump to its final location with a pallet truck before removing it from its sup- port. ●...

  • Page 17: Information Over Lubricants

    Safety​ | 3 Information over Lubricants 3.8.1 Oil filling NS 0350 A WY 3600 A Oil quantity (Liter) Oil type YLC 250 B, Art. No. 0831 131 400 (0,5 l ≈ 1 kg) ● Replacement: After 5000 h (see “Maintenance Schedule [➔ 42]”). 3.8.2 Cooling Liquid Cooling liquid filling...

  • Page 18: Transport

    4 | Transport​ Transport The COBRA DS vacuum pumps are tested and checked in our factory before careful packing. Check the packaging for transport damage when the goods arrive. The vacuum pump can withstand tem- peratures between -25°C and +55°C during transport. Transport in Packed State Packed on a pallet, the vacuum pump can be moved with a hand forklift truck.
  • Page 19 Transport​ | 4 ● Lift the vacuum pump. In case the vacuum pump was bolted to a pallet with fixing bolts: ● Unscrew the fixing bolts in the base frame. CAUTION In case of a vacuum pump filled with oil, make sure that by lifting the inclination angle of the vacuum pump do not exceed 5°...

  • Page 20: Storage

    5 | Storage​ Storage Temporary Storage ● Make sure that the intake and exhaust flanges are closed (put on the protective caps included in the delivery package of the vacuum pump) ● Store the vacuum pump: ● if possible, the vacuum pump should be stored in its original packaging, ●...

  • Page 21: Installation And Commissioning

    Installation and Commissioning​ | 6 Installation and Commissioning Installation Prerequisites CAUTION In case of non-compliance with the installation prerequisites, particularly in case of insuffi- cient cooling: Risk of damage or destruction of the vacuum pump vacuum pump and its components! Risk of personal injury! The installation prerequisites must be complied with.
  • Page 22 6 | Installation and Commissioning​ Free chloride mg/l < 0.3 NOTE 1° (german degree = 1° dGH) = 1,78° (french degree) = 1,25 e (english degree) = 17,9 mg/kg Ca- CO3 (american hardness). ● Make sure that the cooling water is neutral and clean. ●...

  • Page 23: Dimensional Drawing

    Installation and Commissioning​ | 6 If oil changes are to be made on site: ● Make sure that the oil drain and oil filler are easily accessible. 6.1.2 Dimensional Drawing Description Inlet DN 160 ISO-K Outlet DN 50 ISO-KF Cooling water inlet 3/8'' Cooling water outlet 3/8'' Emergency stop Interrupter main...

  • Page 24: Discharge Connection

    6 | Installation and Commissioning​ If the drawn gas contains dusts or solid foreign bodies: ● Make sure that a filter or protective grating is installed at the extraction point. ● Make sure that the nominal diameter of the intake line is at least equal to the diameter of the in- take flange of the vacuum pump to prevent a drop in the performance of the vacuum pump in the case of a smaller cross-section ●...

  • Page 25: Cooling Water Connection

    Installation and Commissioning​ | 6 ● Make sure that the discharge lines do not exercise any force on the discharge flange. Mount bel- lows if necessary. ● The discharge flange has the following dimension: – DN 50 ISO KF In the case of long discharge lines, the line cross-section should be larger than the discharge flange to prevent a drop in the performance of the vacuum pump.

  • Page 26: Installation

    6 | Installation and Commissioning​ Installation 6.2.1 Mounting ● Make sure that the “Necessary installation instructions” are followed. ● Fasten or install the vacuum pump at its final installation site. 6.2.2 Electrical Connection WARNING Risk of electrocution, risk of damage. Electrical installation must be performed by a suitably qualified electrician who knows and fol- lows the following regulations: ●...
  • Page 27 Installation and Commissioning​ | 6 MTS = Motor temperature switch (in motor coil) Double star connection (low voltage): Star connection (high voltage): Motor connectors: Connection of motor temperature switch (recommended): Only apply voltages ≤ 2.5 V MTS = Motor temperature switch (in motor coil) Delta connection (low voltage): Instruction Manual COBRA DS 3141 A_EN_en 27 | 64...
  • Page 28 6 | Installation and Commissioning​ MB Motor Connection Motor connectors: Connection of motor temperature switches (recommended): Control voltage: ≤ 250 V Max current: 1.6 A MTS = Motor temperature switch (in motor coil) Double star connection (low voltage): Star connection (high voltage): 6.2.2.1 Power Wiring Connection Power wiring 4 poles...
  • Page 29 Installation and Commissioning​ | 6 6.2.2.2 Power Connector on Rear Side Description Pump side Phase L1 (Pump side) Phase L2 (Pump side) Phase L3 (Pump side) Ground (Pump side) Mating connectors Phase 1 (Mating connectors) Phase 2 (Mating connectors) Phase 3 (Mating connectors) Ground (Mating connectors) Pump side Supplier...

  • Page 30: Equipment Connections (With Options)

    6 | Installation and Commissioning​ ● Make sure that the vacuum pump draws in. ● If not, push the Emergency stop button. If the direction of rotation must be changed: ● Exchange two of the three feeder leads. Electrical data Frequency I Rate range...

  • Page 31: Connection Of Lines/ Pipes

    Installation and Commissioning​ | 6 6.2.4 Connection of Lines/ Pipes ● Connect the intake lines. ● Connect the discharge lines. ● Make sure that all caps, safeguards, and similar covers are mounted. ● Make sure that the inlet and outlet for the cooling air are not covered or closed and that the flow of cooling air is not impaired in any way.
  • Page 32 6 | Installation and Commissioning​ 6.2.5.1 COBRA NS 0350 A Oil Filling Description Oil fill plug B-side (OFP) OIl sight glass (OSG) Oil drain plug (ODP) Oil fill plug A-side (OFP) Oil sight glass (OSG) Oil drain plug (ODP) ● Unscrew the oil filler plugs (OFP). ●...
  • Page 33 Installation and Commissioning​ | 6 6.2.5.2 PUMA WY 3600 A Oil Filling Description Oil fill plug (OFP) Oil fill plug (OFP) Oil sight glass (OSG) Oil drain plug (ODP) Oil sight glass (OSG) Oil drain plug (ODP) NOTE The quantity of oil specified in the installation handbook is of informative nature only. Check the oil level with the help of the various oil sight glasses (OSG 1,2,3,4) on the vacuum pump.
  • Page 34 6 | Installation and Commissioning​ NOTE It is easier to switch on the vacuum pump with cold oil when the intake line is not closed or when the intake flange is not covered by a rubber plate. DS vacuum pump: ●...

  • Page 35: Cooling Liquid Filling

    Installation and Commissioning​ | 6 6.2.6 Cooling Liquid Filling CAUTION Do not run the vacuum pump without cooling liquid! NOTE The COBRA DS vacuum pumps are generally dispatched with cooling liquid already in the vac- uum pump. Before vacuum pump first startup, control the cooling liquid level. In the event of absence of one or the other of these lubricants, please carry out the filling (see “Cooling Liquid Type/ Quantity [➔ 59]”...

  • Page 36: Direct Cooling Checking

    6 | Installation and Commissioning​ ● Stop filling in cooling liquid. ● Screw on the filler cap for the cooling liquid again. ● If liquid has run on to the outside surfaces of the vacuum pump, wipe it off. ● Start the vacuum pump. If the intake line is equipped with a shut-off device: ●...
  • Page 37 Installation and Commissioning​ | 6 WARNING When using toxic, inflammable and/or explosive gases, make sure that the system corre- sponds in design to applicable local and national safety regulations and that all applicable safety measures are followed. All product-specific safety regulations must be observed. Solid particles must not get into the vacuum pump.
  • Page 38 6 | Installation and Commissioning​ CAUTION The COBRA DS vacuum pumps are always delivered without oil, without cooling water and without cooling liquid. Operation without coolants will result in damage to the vacuum pump! CAUTION The cooling water flow, which is checked by the flow meter CWM, must be at least 4 l/min . ●...

  • Page 39: Switching The Vacuum Pump On/ Off

    Installation and Commissioning​ | 6 NOTE When the vacuum pump has not been in operation for a few days or when a sticky substance has been drawn, it is possible that the two scroll rotors of the NS (DP) vacuum pump will stick to each other.

  • Page 40: Maintenance

    7 | Maintenance​ Maintenance DANGER Live wires. Risk of electrical shock! ● Electrical installation work must only be executed by qualified personnel. DANGER In case the vacuum pump has conveyed gases that have been contaminated with foreign ma- terials 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 vac- uum pump .
  • Page 41 Maintenance​ | 7 ● Stop the pump with the Remote control (RC) (press on STOP button during 10s). ● Press on emergency stop button. ● Switch off the main circuit breaker. ● Open the power box and switch off the circuit breakers. ●...

  • Page 42: Maintenance Schedule

    7 | Maintenance​ Maintenance Schedule The maintenance intervals depend very much on the individual operating conditions. The intervals given below are considered as starting values which should be individually shortened or extended as appropriate. Particularly harsh applications or heavy duty operation, such as high dust loads in the environment or in the process gas, other contamination or ingress of process material, can make it necessary to shorten the maintenance intervals significantly.

  • Page 43: Lock Out/ Tag Out Procedure

    Maintenance​ | 7 Interval Maintenance work Yearly ● If the intake is equipped with a sieve: If one or more of these accesso- ● Check the sieve at the intake and clean if necessary. ries are installed. ● Check the measuring and safety equipment for working or- der.

  • Page 44: Oil Checking

    7 | Maintenance​ Oil Checking 7.2.1 Oil Level Checking ● Make sure that the vacuum pump has been switched off and that it cannot be switched on again accidentally. Indication of the oil level on the various oil sight glasses (OSG 1,2,3,4): Oil level, pump not operating COBRA NS (DP) vacuum pump: If the oil level lies below the target circle:...

  • Page 45: Oil Color Inspection

    Maintenance​ | 7 NOTE The quantity of oil specified in the Instruction Manual is of informative nature only. Check the oil level with the help of the various oil sight glasses on the vacuum pump. CAUTION Danger of burns when the oil filler cap is open. Danger of injuries when the oil filler cap is not screwed on properly.

  • Page 46: Oil Change

    7 | Maintenance​ 7.2.4 Oil Change DANGER If the vacuum pump has pumped gases that were contaminated with foreign bodies that are hazardous to health, the oil is also contaminated with these foreign bodies. There is a health hazard when changing contaminated oil. There is also a danger to the envi- ronment.
  • Page 47 Maintenance​ | 7 Booster (MB): ● Put a drain tray underneath the oil drain plugs (ODP). ● Unscrew the oil drain plugs (ODP). ● Drain the oil. When the oil flow has stopped: ● Refit the oil drain plugs (ODP) again. ●...
  • Page 48 7 | Maintenance​ ● Make sure that the seals of the filler cap are not damaged and that they sit properly. Replace them if necessary. ● Screw on the filler cap again. Booster (MB): ● Prepare the quantity of oil needed (see “Oil Type/ Quantity [➔ 58]”). CAUTION The use of chemically contaminated or polluted oil can lead to hazardous pump conditions which could cause personal injury.

  • Page 49: Cooling Liquid Checking

    Maintenance​ | 7 Cooling Liquid Checking 7.3.1 Cooling Liquid Level Checking ● Make sure that the vacuum pump has been switched off and that it cannot be switched on again accidentally. ● Let the vacuum pump cool down. ● Check the level of the cooling liquid. ●...

  • Page 50: New Cooling Liquid Filling

    7 | Maintenance​ When cooling liquid stops running out: ● Close the drain plug for the cooling liquid. ● Screw filling plug of cooling liquid (CLF). ● Screw the drain plug. ● Switch on the vacuum pump and let it run for a few seconds. ●...

  • Page 51: Additional Checking

    Maintenance​ | 7 ● Stop fill in. ● Close the drain plug. ● Make sure that the seal of the filler cap is not damaged and that they sit properly. Replace them if necessary. ● Screw on the filler cap again. ●...

  • Page 52: Overhaul

    8 | Overhaul​ Overhaul CAUTION Inappropriate maintenance work on the vacuum pump can damage the vacuum pump. Danger of explosion! ● If requirements are not met, the vacuum pump may not be switched on! ● Should work exceed the dismantling work described in this handbook, it may only be carried out by authorized persons.

  • Page 53: Removal From Service

    Removal from Service​ | 9 Removal from Service DANGER Live wires. Risk of electrical shock! ● Electrical installation work must only be executed by qualified personnel. CAUTION Hot surface. Risk of burns! ● Before doing anything that requires touching the machine, let it cool down first. CAUTION Hot liquids.

  • Page 54: Dismantling And Disposal

    9 | Removal from Service​ Dismantling and Disposal DANGER In case the vacuum pump has conveyed gases that have been contaminated with harmful for- eign material which are harmful to health, the oil and the condensates will also be contami- nated with harmful foreign material.

  • Page 55: Spare Parts

    Spare Parts​ | 10 Spare Parts NOTICE Use of non-manufacturer genuine spare parts. Risk of premature failure! Loss of efficiency! ● Use only manufacturer genuine spare parts, consumables and supplies to ensure correct opera- tion of the machine and to validate the warranty. There are no standard spare parts kits available for this product.

  • Page 56: Troubleshooting

    11 | Troubleshooting​ Troubleshooting DANGER Live wires. Risk of electrical shock! ● Electrical installation work must only be executed by qualified personnel. CAUTION Hot surface. Risk of burns! ● Before doing anything that requires touching the machine, let it cool down first. CAUTION Hot liquids.
  • Page 57 Troubleshooting​ | 11 Problem Possible Cause Remedy The machine does not reach Suction or discharge lines too ● Use larger diameter or the usual pressure at the inlet long or section diameter too shorter lines. connection. small. ● Seek advice from your local manufacturer representa- tive.

  • Page 58: Oil Type/ Quantity

    12 | Oil Type/ Quantity​ Oil Type/ Quantity 12.1 Oil Type Make sure that the oil type corresponds to specifications: YLC 250 B ISO-VG Oil Type Synthetic Part number 0.5 L packaging 0831 131 400 Part number 1 L packaging 0831 108 878 Part number 5 L packaging 0831 108 879 Oil suitability...

  • Page 59: Cooling Liquid Type/ Quantity

    Cooling Liquid Type/ Quantity​ | 13 Cooling Liquid Type/ Quantity 13.1 Cooling Liquid Type Make sure that the Cooling Liquid type corresponds to specifications: Zitrec M-25 (ready-to-use) Part number 5 L packaging 0831 563 469 Part number 25 L packaging 0831 563 468 The cooling liquid Zitrec M-25 is ready-to-use and does not require additional water.

  • Page 60: Technical Data

    14 | Technical Data​ Technical Data DS 3141 A Nominal pumping speed m³/h 2875 Ultimate pressure TORR 0.00225 hPa (mbar) abs. 0.003 Nominal motor rating backing kW (72 Hz) pump Nominal motor rating vacuum kW (90 Hz) 15.0 booster Power consumption at ultimate kW (MB: 90 Hz;...

  • Page 61: Eu Declaration Of Conformity

    CE-marking. The manufacturer Busch Manufacturing Korea, Ltd. 189-51, Soicheon-ro, Majang-myun Icheon-si, Gyunggi-do, 467-813 Republic of Korea declares that the machine: COBRA DS 3141 A fulfill(s) all the relevant provisions from EU directives: – ‘Machinery’ 2006/42/EC – ‘Electromagnetic Compatibility’ (EMC) 2014/30/EU –...

  • Page 62: Declaration Of Conformity

    The manufacturer Busch Manufacturing Korea, Ltd. 189-51, Soicheon-ro, Majang-myun Icheon-si, Gyunggi-do, 467-813 Republic of Korea declares that the machine: COBRA DS 3141 A fulfill(s) all the relevant provisions from UK legislations: – Supply of Machinery (Safety) Regulations 2008 – Electromagnetic Compatibility Regulations 2016 –...
  • Page 63 ​ N otes Notes Instruction Manual COBRA DS 3141 A_EN_en 63 | 64...
  • Page 64 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. A global network of highly competent local teams in 44 countries ensures that expert, tailor-made support is always available near you.

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