BUSCH COMBI COBRA DS 3181 C User manual

COBRA
Dry Screw Vacuum Pumps
DS 3181 C
Instruction Manual
0870739194 | B0004_en-US | Original instructions 10/24/2023

Table of Contents
2 | 68 Instruction Manual COBRA DS 3181 C_EN_en
Table of Contents
1 Preface ................................................................................................................................................................... 4
1.1 Congratulations on your purchase................................................................................................................... 4
2 Product Description ............................................................................................................................................. 5
2.1 COBRA DS 3181 C................................................................................................................................................ 5
2.2 Use ........................................................................................................................................................................ 8
2.3 Operating Principle............................................................................................................................................. 9
2.3.1 COMBI.................................................................................................................................................... 9
2.3.2 Gas Flow Checks ................................................................................................................................... 10
2.4 Oil Circuit.............................................................................................................................................................. 10
2.5 Cooling.................................................................................................................................................................. 10
2.6 Nitrogen System.................................................................................................................................................. 10
2.7 Optional Functions/ Use of Available Accessories .......................................................................................... 11
2.8 On/ Off Switch...................................................................................................................................................... 11
2.9 Versions................................................................................................................................................................ 11
3 Safety ..................................................................................................................................................................... 12
3.1 Intended Use ....................................................................................................................................................... 12
3.2 Safety Information .............................................................................................................................................. 12
3.3 Safety Stickers...................................................................................................................................................... 13
3.4 Noise Emission .................................................................................................................................................... 14
3.5 Safety Area ........................................................................................................................................................... 14
3.6 Electrical Safety.................................................................................................................................................... 14
3.6.1 Types of Electrical Work....................................................................................................................... 14
3.6.2 Lock Out/ Tag Out Procedure (Type 1 of Electrical Work) ............................................................... 15
3.6.3 Emergency Off Circuit Description..................................................................................................... 15
3.6.4 Safety Lockout Procedure ................................................................................................................... 15
3.6.5 Lock Out/ Tag Out for Hydraulics and Pneumatics.......................................................................... 15
3.6.6 Lock Out/ Tag Out Procedure (Type 1 of Electrical Work) ............................................................... 15
3.7 Seismic Zone Installation ................................................................................................................................... 16
3.8 Information over the Lubricants....................................................................................................................... 17
3.8.1 Oil ........................................................................................................................................................... 17
3.8.2 Cooling Liquid ....................................................................................................................................... 17
3.9 Decommissioning Procedure ............................................................................................................................ 17
4 Transport............................................................................................................................................................... 18
4.1 Transport in Packed State .................................................................................................................................. 18
4.2 Transport in Unpacked State............................................................................................................................. 18
5 Storage................................................................................................................................................................... 20
5.1 Temporary Storage............................................................................................................................................. 20
5.2 Removal of the Vacuum Pump .......................................................................................................................... 20
5.3 Preservation......................................................................................................................................................... 20
5.3.1 Start-up of the Vacuum Pump after Storage .................................................................................... 20
6 Installation and Commissioning ........................................................................................................................ 21
6.1 Installation Prerequisites ................................................................................................................................... 21
6.1.1 Local Installation................................................................................................................................... 21
6.1.2 Dimensional Drawing .......................................................................................................................... 23
6.1.3 Inlet Connection ................................................................................................................................... 23
6.1.4 Discharge Connection.......................................................................................................................... 24
6.1.5 Cooling Water Connection .................................................................................................................. 25
6.1.6 Nitrogen Connection............................................................................................................................ 25

Table of Contents
Instruction Manual COBRA DS 3181 C_EN_en 3 | 68
6.1.7 Electrical Connection/ Checks............................................................................................................. 25
6.2 Installation ........................................................................................................................................................... 25
6.2.1 Mounting ............................................................................................................................................... 25
6.2.2 Electrical Connection............................................................................................................................ 26
6.2.3 Equipment Connections (with Options)............................................................................................. 30
6.2.4 Connection of Lines/ Pipes.................................................................................................................. 31
6.2.5 Oil Filling ................................................................................................................................................ 31
6.2.6 Cooling Liquid Filling............................................................................................................................ 36
6.2.7 Direct Cooling Checking ...................................................................................................................... 38
6.2.8 Nitrogen Supply Checking................................................................................................................... 38
6.2.9 Operating Parameters Saving ............................................................................................................ 38
6.3 Recommendations on Operation...................................................................................................................... 38
6.3.1 Application............................................................................................................................................. 38
6.3.2 Switching the Vacuum Pump On/ Off ................................................................................................ 40
6.4 Load Lock Operation Mode................................................................................................................................ 41
7 Standard Operational Time Chart ...................................................................................................................... 43
7.1 Signal Control Mode (Select LL Mode = EXTERN) ............................................................................................ 43
7.2 Current Control Mode (Select LL Mode = AUTO)............................................................................................. 44
8 Maintenance ......................................................................................................................................................... 45
8.1 Maintenance Schedule ....................................................................................................................................... 46
8.1.1 Lock Out/ Tag Out Procedure ............................................................................................................. 48
8.1.2 Safety Lockout Procedure ................................................................................................................... 48
8.2 Oil Checking......................................................................................................................................................... 48
8.2.1 Oil Level Checking ................................................................................................................................ 48
8.2.2 Oil Refilling ............................................................................................................................................ 49
8.2.3 Oil Color Inspection.............................................................................................................................. 50
8.2.4 Oil Change............................................................................................................................................. 50
8.3 Cooling Liquid Checking..................................................................................................................................... 53
8.3.1 Cooling Liquid Level Checking ............................................................................................................ 53
8.3.2 Cooling Liquid Refilling........................................................................................................................ 53
8.3.3 Cooling Liquid Draining....................................................................................................................... 54
8.3.4 New Cooling Liquid Filling................................................................................................................... 54
8.4 Additional Checking............................................................................................................................................ 55
9 Overhaul ................................................................................................................................................................ 56
10 Removal from Service .......................................................................................................................................... 57
10.1 Temporary Removal from Service..................................................................................................................... 57
10.2 Recommissioning................................................................................................................................................ 57
10.3 Dismantling and Disposal .................................................................................................................................. 58
11 Spare Parts ............................................................................................................................................................ 59
12 Troubleshooting ................................................................................................................................................... 60
13 Oil Type/ Quantity ................................................................................................................................................ 62
13.1 Oil Type................................................................................................................................................................. 62
13.2 Oil Quantity.......................................................................................................................................................... 62
14 Cooling Liquid Type/ Quantity ............................................................................................................................ 63
14.1 Cooling Liquid Type ............................................................................................................................................ 63
14.2 Cooling Liquid Quantity...................................................................................................................................... 63
15 Technical Data ...................................................................................................................................................... 64
16 EU Declaration of Conformity ............................................................................................................................. 65
17 UK Declaration of Conformity............................................................................................................................. 66

1 | Preface
4 | 68 Instruction Manual COBRA DS 3181 C_EN_en
1 Preface
1.1 Congratulations on your purchase
Congratulations on your purchase of the Busch vacuum pump. With watchful observation of the
field’s requirements, innovation and steady development Busch delivers modern vacuum and pres-
sure solutions worldwide.
These operating instructions contain information for
●product description,
●safety,
●transport,
●storage,
●installation and commissioning
●maintenance,
●overhaul and
●troubleshooting
of the vacuum pump.
For the purpose of these instructions, “handling” the vacuum pump means the transport, storage,
installation, commissioning, influence on operating conditions, maintenance, troubleshooting and
overhaul of the vacuum pump.
Prior to handling the vacuum pump these operating instructions shall be read and understood. If
anything remains to be clarified, please contact your Busch representative.
Keep these operating instructions and, if applicable, other pertinent operating instructions available
on site.

Product Description | 2
Instruction Manual COBRA DS 3181 C_EN_en 5 | 68
2 Product Description
2.1 COBRA DS 3181 C
IN
OUT
OSG 3
LCD
EX
OSG 1
CWC
DGC
ECO
MSH
PLC
ESS
SC
DP
EB
ECO
Description
IN Suction connection OUT Discharge connection
CWC Cooling water connections DGC Nitrogen connections
DP Backing vacuum pump DP 0800 A EB Lifting eyebolt for DP 0800 A
ESS Emergency stop button ECO Electrical connections
EX Extracting ventilator LCD Handpad
MSH Main switch OSG 1 Oil sight glass
OSG 3 Oil sight glass PLC Busch PLC
SC Sensor connection

2 | Product Description
6 | 68 Instruction Manual COBRA DS 3181 C_EN_en
COBRA DP 0800 A
IN
OUT
EX
EB
TS 5
PRV
TS 4
OSG 2
TS 2
CWR
MV
DGR 1
DGR 2
EV
TS 3 FS 2
TR
HE
FME
CWI
CWO
DGC
OSG 1
TS 1
CLP
CLF
SV
CLV
Description
CLP Glycol circulating pump CWI Cooling water inlet connection
CWO Cooling water outlet connection CWR Regulating valve, cooling water
DGC Nitrogen connection DGR 1 Regulating valve, dilution gas (middle of cyl-
inder)
DGR 2 Regulating valve, dilution gas (end of cylin-
der)
ECO Power connection
FME Nitrogen flowmeter FS 1 Flow switch, cooling liquid
FS 2 Flow switch, cooling water HE Heat exchanger
MV Regulating with solenoid valve, dilution gas OSG 1 Oil sight glass
OSG 2 Oil sight glass OUT Discharge
PRV Regulating valve, Nitrogen SV Safety valve
TR Temperature regulator, 55°C TS 1 Temperature switch, oil temperature 120°C
TS 2 Temperature switch, cooling liquid tempera-
ture 100°C
TS 3 Temperature sensor PT100
TS 4 Temperature switch, oil temperature 140°C TS 5 Overpressure sensor

Product Description | 2
Instruction Manual COBRA DS 3181 C_EN_en 7 | 68
Process Gas Diagram
1
2
3
4
5
6
7
8
9
11
12
13
14
19
18
15
17
24
16
10
23
21 22
25
26
20
27
28
Description
1 Process gas inlet (PGI) 2 Process gas outlet (PGO)
3 Cooling water regulating valve (CWR) 4 Cooling liquid pump (CLP)
5 Heat exchanger (HE) 6 Nitrogen flow meter, dilution gas (FME)
7 Nitrogen pressure reducer (PRV) 8 Magnetic valve (MV), regulating valve
with soleneoid valve, dilution gas
9 Regulating valve, dilution gas DP
(DGR1)
10 Regulating valve, dilution gas at ex-
haust (DGR2)
11 Nitrogen supply (NC) 12 Cooling water inlet (CWI)
13 Cooling water outlet (CWO) 14 Motor MB (MOT2)
15 Motor DP (MOT1) 16 Oil sight glass DP (OSG1)
17 Oil sight glass DP (OSG2) 18 Oil sight glass MB (OSG3)
19 Oil sight glass MB (OSG4) 20 Temperature regulator, 55°C (TR)
21 Temperature switch, oil temperature
120°C (TS1)
22 Temperature switch, cooling liquid tem-
perature 100°C (TS2)
23 Temperature sensor PT100
(TS3)
24 Temperature switch 140°C (TS4)
25 Overpressure sensor (TS5) 26 Temperature switch 155°C (TS6)
27 Flow switch, cooling liquid (FS 1) 28 Flow switch, cooling water (FS 2)

2 | Product Description
8 | 68 Instruction Manual COBRA DS 3181 C_EN_en
COBRA NS 0800 A
7
341
25
810
6
9
Description
1 Inlet 2 Outlet
3 Oil 4 Cooling liquid
5 Cooling water 6 Barrier gas
7 Screw rotors 8 Dilution gas (dil 2)
9 Dilution gas (dil 1) 10 Motor klixon
PUMA WY 3600 A
1
2
34
5
Description
1 Inlet 2 Outlet
3 Oil 4 Booster lobe
5 Cooling water
2.2 Use
The COBRA DS vacuum pumps are designed for use in the field of microelectronics and similar in-
dustries.
They can be used to suck gases and gas mixtures.

Product Description | 2
Instruction Manual COBRA DS 3181 C_EN_en 9 | 68
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. Procedural errors can result in the vacuum
pump sucking in a certain quantity of liquid. If the pump has sucked in liquid, a short drying time is
necessary at the end of the procedure.
The allowed maximum inlet gas temperature depends on the inlet pressure and the type of gas: the
lower the inlet pressure (Pa), the higher the drawn gas temperature (TGas) can be.
The following indicative values for air can be considered:
●Pa > 50 mbar, TGas < 80°C
●Pa < 50 mbar, TGas < 200°C
The vacuum pump is intended for use in a potentially non-explosive environment.
●Make sure that the maximum permissible number of starts does not exceed 2 starts per hour.
Those starts should be spread within the hour.
The vacuum pump is thermally suitable for continuous operation at any pressure between atmo-
spheric pressure and ultimate pressure.
The vacuum pump is tight down to ultimate pressure.
2.3 Operating Principle
2.3.1 COMBI
The COBRA DS 3181 C vacuum pumps are a combination of a screw vacuum pump NS 0800 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.
The COBRA NS screw vacuum pumps are driven by water-cooled motors.
2.3.1.1 Principle of DP Vacuum Pumps
The COBRA NS screw vacuum pumps work by the principle of spiral pumps. Two parallel screws (8)
rotate in opposite directions in the pump body. Entering gases are trapped between the flights of
the screws and the pump body. The gases are conveyed by the rotation of the screws to the ex-
haust, where they are discharged.
2.3.1.2 Principle of MB Vacuum Pumps
The Booster vacuum pumps operate according to the approved principle of the Booster type ma-
chine. Operation is both simple and effective. Two lobes (9) with identical profiles rotate in opposi-
tion directions within a casing. As they rotate, gas is drawn into the space between each lobe and
the casing where it is trapped and by the rotation pushed out into the discharge. This action is re-
peated twice for each revolution of each lobe and therefore four times for each revolution of the
drive shaft. There is no mechanical contact between lobes and cylinder. So no oil lubrication is re-
quired.
The drive motor of Booster vacuum pump is a water-cooled canned motor.
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 | Product Description
10 | 68 Instruction Manual COBRA DS 3181 C_EN_en
2.3.2 Gas Flow Checks
A pressure sensor TS5 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.
2.4 Oil Circuit
Since the complete operating principle works without contact, no oil circuit is needed in the work ar-
ea.
2.5 Cooling
The vacuum pump is cooled by:
●The filling of cooling liquid (mix of water and glycol) inside the water chambers (6) of cylinder and
end plate of cylinder B-side. An indirect circuit is made with a water pump mounted at the end-
plate of cylinder B-side. The flow of the cooling liquid is controlled by a flow switch FS 1. If the flow
is under 1 l/min during a minimum time of 30 seconds, then the vacuum pump stops. The tem-
perature switch TS2 will give an emergency signal if the temperature of the cooling liquid is above
100°C. The pump will stop immediately after the emergency alarm ring.
●A direct cooling water circuit in the motors in the cylinder covers A and B side of WY rotary lobes
vacuum pump and COBRA NS vacuum pump. The cooling water flow is preset at 10 l/min at the
factory and can be adjusted with regulating valve CWR. The flow is controlled by flow switch FS 2.
The cooling water circuit stabilizes the temperature of cooling liquid. When flow is too low a warn-
ing then an alarm signal is generated by flowmeter CWM to the PLC. Status of the pump depends
on the alarm function set by user (factory setting: ESS, pump stops after alarm condition).
●a direct cooling water circuit in the rear bearing (for exceptionally cool running in option).
NOTE
The COBRA DS vacuum pumps are principally dispatched with oil and cooling liquid already in
the vacuum pump but, without cooling water. Before vacuum pump first startup, control the
oil level and the cooling liquid level. In the event of absence of one or the other of these lubri-
cants, please carry out the filling (please refer to the various chapters of filling). Do not forget
to connect the cooling water supply before the first startup. Operation without these coolants
can result in damage to the vacuum pump.
2.6 Nitrogen System
The nitrogen system can be used in a number of different ways:
●Nitrogen is used as dilution gas. It is injected inside the cylinder on two different places. Nitrogen
flow FME injected in the middle hole is preset at 20 Nl/min and can be adjusted with valve DGR1,
depending on the application. Nitrogen flow injected in the hole on cylinder end-plate side is pre-
set at 40 Nl/min and can be adjusted with valve DGR2, depending on the application. When flow is
too low a warning then an alarm signal is generated by flowmeter FME to the PLC. Status of the
pump depends on the alarm function set by user (factory setting: None, pump continues running
with an alarm). Dilution improves the screws functioning, especially when sucking corrosive gas-
es.
●Nitrogen is used as sealing gas. The nitrogen is injected between the transmission and the pro-
cess gas to achieve good closeness.

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Instruction Manual COBRA DS 3181 C_EN_en 11 | 68
2.7 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. It must be connected in such a way that actuation causes the vac-
uum pump to be switched off when the pressure exceeds a value of 3 bar.
A pressure sensor (TS5) mounted at the exhaust, controls the overpressure at the exhaust. If over-
pressure is above 0,2 bar, pressure sensor gives a warning then an alarm signal. Status of the pump
depends on the alarm function set by user (factory setting: None, vacuum pump continues running
with an alarm).
A temperature sensor PT100 (TS3) mounted on the cylinder, measures the temperature inside the
cylinder (DP).
A silencer or sound absorber (accessory) at the exhaust reduces the noise of the vacuum pump and
collects any condensate.
A leak-protection non-return valve (optional) at the exhaust traps the condensate in the vacuum
pump when the vacuum pump is switched off.
The nitrogen can also be used as flushing gas. Depending on the application, flushing is recom-
mended after every use to ensure trouble-free operation of the vacuum pump. The nitrogen is in-
jected directly into the intake port. In the absence of nitrogen flushing can also be performed with
the help of air.
The LCD controller processes the data of the sensors as follows:
●TS1: exhaust pressure
●TSA: temperature inside the cylinder DP
●MOT1 and MOT2: DP and MB current and speed
●FME: nitrogen flow rate, dilution
●CWM: cooling water flow rate in motors/ transmission / variable speed drives
See "Installation and Maintenance Instructions, Busch PLC and Busch LCD (No. 0870758077)".
2.8 On/ Off Switch
The vacuum pump is delivered with a circuit breaker. The function start/ stop can be done in Local
by using the LCD controller or in Remote by the production machine.
2.9 Versions
Further vacuum pump descriptions state the nominal displacement and the design level.
Example: DS 3181 C
DS = standard version
3181 = 3500 m3/h
C = Design

3 | Safety
12 | 68 Instruction Manual COBRA DS 3181 C_EN_en
3 Safety
3.1 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. It may only be operated by qualified personnel.
The different application possibilities and limit values for operation described in “Product descrip-
tion” and “Installation requirements” must be observed by the manufacturer of the system into
which the vacuum pump is to be integrated and by users.
The need for personal safety regulations depends in principle on the type of use. The operator must
provide the users with the necessary means and must inform his personnel about the dangers ema-
nating from the processed product.
The operator of the vacuum pump must observe the safety regulations and must train and instruct
his personnel accordingly.
Local regulations regarding the motors and electric control elements must be observed when in-
stalling the pump in potentially explosive environments.
The maintenance instructions must be followed and observed.
These installation and maintenance instructions must be read and understood before the vacuum
pump is used. If you have any doubts, contact your Busch representative.
3.2 Safety Information
The vacuum pump is designed and manufactured in compliance with the latest technical standards
and safety regulations. Nevertheless, an element of residual risk remains.
This instruction manual highlights potential hazards where appropriate. Safety notes and warning
messages are tagged with one of the keywords DANGER, WARNING, CAUTION, NOTICE and NOTE as
follows:
DANGER
... indicates an imminent dangerous situation that will result in death or serious injuries if not
prevented.
WARNING
... indicates a potentially dangerous situation that could result in death or serious injuries.
CAUTION
... indicates a potentially dangerous situation that could result in minor injuries.
NOTICE
... indicates a potentially dangerous situation that could result in damage to property.

Safety | 3
Instruction Manual COBRA DS 3181 C_EN_en 13 | 68
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.
3.3 Safety Stickers
COBRA NS 0800 A
12
Description
1 Warning! Hot surface! Do not touch! 2 Warning! Hot surface! Do not touch!
PUMA WY 3600 A
12
Description
1 Warning! Hot surface! Do not touch! 2 Warning! Hot surface! Do not touch!

3 | Safety
14 | 68 Instruction Manual COBRA DS 3181 C_EN_en
COBRA DS 3181 C
3.4 Noise Emission
Refer to the table “Technical data” for the permissible noise levelling free field conditions according
to EN ISO 2151.
CAUTION
The sound level of the vacuum pump within a certain perimeter of the vacuum pump is high.
Risk of hearing damage.
Users who are spending a longer period in the vicinity of a non-insulated vacuum pump must
wear suitable ear protection.
3.5 Safety Area
Before any maintenance action, ensure a safety perimeter of a least 610 [mm] around the vacuum
pump. Before any maintenance action, ensure a safety perimeter of a least 610 [mm] around the
vacuum pump.
3.6 Electrical Safety
3.6.1 Types of Electrical Work
The following are the four types of electrical work defined by the SEMI S2, latest version, guideline:
Type 1
Equipment is fully deenergized.
Type 2
Equipment is energized. Energized circuits are covered or insulated.
NOTE: Type 2 work includes tasks where the energized circuits are or can be measured by placing
probes through suitable openings in the covers or insulators.

Safety | 3
Instruction Manual COBRA DS 3181 C_EN_en 15 | 68
Type 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. Energized circuits are exposed and inadvertent contact with uninsulated
energized parts is possible. Potential exposures are greater than 30 volts rms, 42.4 volts peak, 60
volts dc, or 240 volt-amp in dry locations. Potential exposures to radio-frequency currents, whether
induced or via contact, exceed the limits in Table A5-1 of Appendix 5 (SEMI S2 guideline).
3.6.2 Lock Out/ Tag Out Procedure (Type 1 of Electrical Work)
●Stop the pump with the LCD controller (press on STOP button during 10s).
●Press on emergency stop button.
●Switch off the main circuit breaker.
●Switch off the customer’s power supply.
●Switch off the water and nitrogen quick connections (inlet first, then outlet).
●Put the label or warning board “Maintenance processing” on or next to the vacuum pump.
3.6.3 Emergency Off Circuit Description
●The Emergency off circuit may be opened by pressing on emergency stop button. If this element
occurs, then the DP and MB vacuum pumps will immediately stop. The PLC will remain energized
to save the pump status.
●If the emergency stop button was pressed, check the startup of the pump then release this but-
ton to restart the pump. Press on Start button on the LCD controller, the pump will restart.
3.6.4 Safety Lockout Procedure
●Take off the label or warning board “Maintenance processing”.
●Check the cooling liquid and oil levels according to the chapters “Checking the oil level” and
“Checking the cooling liquid level”.
●Open the power box cover and check that the FDP1 thermal relay is on manual reset position.
●Close the cover.
●Switch on the main disconnect switch.
●Release the emergency stop button.
●Switch on the water (outlet first, then inlet) and nitrogen quick connections.
●Start the pump with the remote control (press on START button).
3.6.5 Lock Out/ Tag Out for Hydraulics and Pneumatics
●Hydraulics: cooling water.
●Pneumatics: nitrogen.
3.6.6 Lock Out/ Tag Out Procedure (Type 1 of Electrical Work)
●Stop the pump with the remote control (press on STOP button during 10s).
●Press on emergency stop button.
●Switch off the main disconnect switch.
●Switch off the customer’s power supply.
●Switch off the water (inlet first, then outlet) and nitrogen quick connections.
●Put the label or warning board “Maintenance processing” on or next to the pump.
The end user is responsible for providing energy isolation capabilities on the water and nitrogen.

3 | Safety
16 | 68 Instruction Manual COBRA DS 3181 C_EN_en
3.7 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.
●Unscrew the fixing screws of the vacuum pump on the transport pallet and remove the machine
from its support with an appropriate lifting system by using the lifting brackets made for this pur-
pose.
234
1
Description
1 Adjusting nut 2 Wheel
3 Adjusting nut 4 Wheel
●The vacuum pump must not lay only on the brackets. Unscrew the four adjusting nuts until the
machine legs touch the ground.
●Check that the wheels no longer touch the ground.
CAUTION
The vacuum pump is fixed to the ground with four M10 screws, two screws per bracket. The
fixing screw must stand a 1200 N tensible force (per bracket).
The final user must adapt the type of screws depending on the ground material.

Safety | 3
Instruction Manual COBRA DS 3181 C_EN_en 17 | 68
3.8 Information over the Lubricants
3.8.1 Oil
Oil filling NS 0800 A WY 3600 A
Oil quantity (Liter) 1.6 3.5
Oil type Busch YLC 250 B, Art. No. 0831 131 400 (0,5 l ≈ 1 kg)
●Replacement: After 5000 h (see “Maintenance Schedule [➔46]”).
3.8.2 Cooling Liquid
Cooling liquid filling NS 0800 A
Cooling liquid quantity (Liter) approx. 26 liters
Cooling liquid type Glycol (Ethylene),
Art. No. 0831 563 469, Zitrec M-25
(already mixed ready-to-use)
●Replacement: After 5000 h (see “Maintenance [➔45]”).
3.9 Decommissioning Procedure
When the product arrives at the end of the lifetime, it is necessary to proceed to the decontamina-
tion of the vacuum pump.
CAUTION
Only authorized personnel may carry out any dismantling on the vacuum pump. Before work
begins, the operator of the vacuum pump must fill in a form or a “Declaration Regarding Con-
tamination 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 responsible person, the vacuum
pump may not be dismantled.
●Proceed to disassembly of the vacuum pump. Please make sure to wear a personal protective
equipment (PPE) prior to any intervention on the vacuum pump. Some residues may remain in-
side.
●Proceed to decommissioning of the different parts according to the current local and national
laws.

4 | Transport
18 | 68 Instruction Manual COBRA DS 3181 C_EN_en
4 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.
4.1 Transport in Packed State
Packed on a pallet, the vacuum pump can be moved with a hand forklift truck.
4.2 Transport in Unpacked State
The vacuum pump is fastened to the pallet with fixing pins:
●Unscrew the fastening nuts underneath the pallet.
CAUTION
Do not work, walk, or stand under suspended loads.
CAUTION
Please check out the weight of the vacuum pump before lifting it up (see "Technical Data").
Use adequate lifting gear for this.
NOTE
The eyebolts are fitted more or less at equal distance from the center of gravity of the vacuum
pump incl. drive motor. If any accessories that could upset the balance of the vacuum pump,
are installed, or if the vacuum pump is delivered without drive motor, it is necessary to add a
belt or rope at a suitable point when lifting the vacuum pump.
●Attach lifting gear securely to the eyebolt or eyebolts.
●Use lifting gear with a crane hook equipped with safety latch.
●Lift the vacuum pump.
Lifting for DP 0800 A

Transport | 4
Instruction Manual COBRA DS 3181 C_EN_en 19 | 68
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° from the horizontal. In case of too high inclination (>5°), risk
of oil leak within the work area.
●Make sure before every transport using the appropriate lifting mean that the inclination of the
vacuum pump is less than 5°.
The packaging material must be disposed of in accordance with local and national regulations.
This handbook is contained in the delivery package.
For future transportation:
●Seal all open connections with protective caps (to prevent penetration of dirt and water).
●Secure loose cables.
●Protect from shock.
●Drain all process and operating media.
●Secure vacuum system firmly before transporting (e.g. bolt to several pallets).
●Use a lift truck to move and set the vacuum system down.

5 | Storage
20 | 68 Instruction Manual COBRA DS 3181 C_EN_en
5 Storage
5.1 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,
●indoors,
●dry,
●in a dust-free and vibration-free room.
5.2 Removal of the Vacuum Pump
Before starting a vacuum pump that has been stored outside the building for a while, the vacuum
pump must be moved to a room with ambient temperature, where it should rest for a day.
5.3 Preservation
If the vacuum pump will be exposed to unfavorable ambient conditions (for example, aggressive en-
vironment, frequent temperature changes), begin immediately with preservation work on the vacu-
um pump.
In the case of favorable ambient conditions, perform preservation work on the vacuum pump if a
storage period of more than three months is planned.
●Make sure that all openings are hermetically sealed; use adhesive tape to fasten loose parts (seal
rings, flat seals, etc.).
NOTE
VCI is the abbreviation for “volatile corrosion inhibitor”. The VCI molecule is an organic corro-
sion inhibitor in the vapor phase. Integrated in various carriers such as film, cardboard, paper,
foam, liquid and powder, it protects the parts against corrosion because of its action in the va-
por phase. However, VCI packaging can attack synthetic surfaces and surfaces of other elasto-
mers. If in doubt, please contact your nearest distributor. VCI packaging provides several
years of protection against corrosion, even under the harshest of conditions: overseas ship-
ment, extended storage before use.
●Wrap the vacuum pump in a VCI film.
●Store the vacuum pump:
●if possible, the vacuum pump should be stored in its original packaging,
●indoors,
●dry,
●in a dust-free and
●vibration-free room.
5.3.1 Start-up of the Vacuum Pump after Storage
●Make sure that all protective elements, stoppers, or adhesive tapes attached before preservation
have been removed.
●Switch on the vacuum pump in the sequence described in “Installation and Commissioning
[➔21]”.