COBRA

Dry Screw Vacuum Pumps
NC 1000 B Water-Cooled Version (WCV)

Instruction Manual

0870551589 | A0005_en-US | Original instructions

11/6/2023

Table of Contents​

Table of Contents
1

Safety .....................................................................................................................................................................

4

2

Product Description .............................................................................................................................................

5

2.1

Operating Principle .............................................................................................................................................

6

2.2

Intended Use .......................................................................................................................................................

6

2.3

Start Controls.......................................................................................................................................................

7

2.4

Standard Features...............................................................................................................................................
2.4.1
Water Cooling .......................................................................................................................................
2.4.2
Resistance Thermometer ....................................................................................................................
2.4.3
Level Switch...........................................................................................................................................
2.4.4
Thermometer ........................................................................................................................................
2.4.5
Sealing Systems ....................................................................................................................................

7
7
7
7
7
7

2.5

Optional Accessories...........................................................................................................................................
2.5.1
Gas Ballast Valve...................................................................................................................................
2.5.2
Silencer ..................................................................................................................................................
2.5.3
Barrier Gas System...............................................................................................................................
2.5.4
Mechanical Seals ..................................................................................................................................

7
7
7
7
8

3

Transport ...............................................................................................................................................................

9

4

Storage...................................................................................................................................................................

10

5

Installation............................................................................................................................................................

11

5.1

Installation Conditions .......................................................................................................................................

11

5.2

Connecting Lines / Pipes ....................................................................................................................................
5.2.1
Suction Connection ..............................................................................................................................
5.2.2
Discharge Connection..........................................................................................................................
5.2.3
Cooling Water Connection ..................................................................................................................
5.2.4
Barrier Gas System Connection (Optional)........................................................................................

11
12
12
13
14

5.3

Filling Oil...............................................................................................................................................................

15

5.4

Filling Cooling Liquid ..........................................................................................................................................

16

5.5

Fitting the Coupling ............................................................................................................................................

17

Electrical Connection ...........................................................................................................................................

18

6.1

Machine delivered without Control Box or Variable Speed Drive (VSD) ......................................................

18

6.2

Wiring Diagram Three-Phase Motor (Pump Drive).........................................................................................

19

6.3

Electrical Connection of the Monitoring Devices ............................................................................................
6.3.1
Wiring Diagram Resistance Thermometer........................................................................................
6.3.2
Wiring Diagram Level Switch ..............................................................................................................

20
20
21

Commissioning .....................................................................................................................................................

22

7.1

Conveying Condensable Vapors........................................................................................................................

23

Maintenance .........................................................................................................................................................

24

8.1

Maintenance Schedule .......................................................................................................................................

25

8.2

Oil Level Inspection.............................................................................................................................................

25

8.3

Cooling Liquid Level Inspection ........................................................................................................................

26

8.4

Replacing the Gas Ballast Filter (Optional).......................................................................................................

26

8.5

Oil Change............................................................................................................................................................

26

8.6

Cooling Liquid Change .......................................................................................................................................

29

9Overhaul ................................................................................................................................................................

30

10

Decommissioning .................................................................................................................................................

31

10.1

Dismantling and Disposal ..................................................................................................................................

31

Spare Parts ............................................................................................................................................................

32

6

7
8

11

2 | 40Instruction Manual COBRA NC 1000 B WCV_EN_enTable of Contents
12

Troubleshooting ...................................................................................................................................................

33

13

Technical Data ......................................................................................................................................................

35

14

Cooling Liquid .......................................................................................................................................................

36

15

Oil ...........................................................................................................................................................................

37

16

EU Declaration of Conformity .............................................................................................................................

38

17

UK Declaration of Conformity.............................................................................................................................

39

Instruction Manual COBRA NC 1000 B WCV_EN_en

3 | 401 | Safety​

1

SafetyPrior to handling the machine, this instruction manual should be read and understood. If anythingneeds 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.
The machine is intended for industrial use. It must be handled only by technically trained personnel.
Always wear appropriate personal protective equipment in accordance with the local regulations.
The machine has been designed and manufactured in accordance with the state-of-the-art methods.
Nevertheless, residual risks may remain, as described in the following chapters and in accordancewith the chapter Intended Use [➔ 6].
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 notprevented.

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.

NOTE... indicates helpful tips and recommendations, as well as information for efficient and trouble-free operation.

4 | 40Instruction Manual COBRA NC 1000 B WCV_EN_enProduct Description​ | 2

2

Product Description
SV

GB

LS

CLF

IN CLG PMR

CLP

CWI

PHE CWOMPOSGOUT OFP

NP

EB

TM

OFP CLD MTB
SI

MP

ODP

OSG

CLD

TSA

CD

OUT

ODP

DescriptionIN

Suction connection (Inlet)

OUT

Discharge connection (Outlet)

CD

Condensate drain

CLD

Cooling liquid drain plug

CLF

Cooling liquid fill plug

CLG

Cooling liquid sight glass

CLP

Cooling liquid pump

CWI

Cooling water inlet

CWO

Cooling water outlet

EB

Eye bolt

GB

Gas ballast valve

LS

Level switch

MP

Magnetic plug

MTB

Motor terminal box

NP

Nameplate

ODP

Oil drain plug

OFP

Oil fill plug

OSG

Oil sight glass

PHE

Plate heat exchanger

PMR

Plug for manual rotation of rotors

SI

SilencerSV

Safety valve

TM

Thermometer

TSA

Resistance thermometer

Instruction Manual COBRA NC 1000 B WCV_EN_en

5 | 402 | Product Description​

NOTE
Technical term.
In this instruction manual, we consider that the term ‘machine’ refers to the ‘vacuum pump’.

NOTE
Illustrations.
In this instruction manual, the illustrations may differ from the appearance of the machine.

2.1

Operating Principle

The machine works on the one-stage, twin-screw pump principle.
Two screw rotors rotate inside the cylinder. The pumped medium is trapped between the cylinderand screw chambers, compressed, and transported to the gas outlet. During the compression process, the two screw rotors do not come into contact with each other or with the cylinder. There is noneed for a lubrication or an operating fluid in the compression chamber.

2.2

Intended Use
WARNING
In case of foreseeable misuse outside the intended use of the machine.
Risk of injuries!
Risk of damage to the machine!
Risk of damage to the environment!
● Make sure to follow all instructions described in this manual.
The machine is intended for the suction of air and other dry, non-aggressive, non-toxic and non-explosive gases.
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.
The machine is suitable for continuous operation.
Permitted environmental conditions, see Technical Data.

6 | 40Instruction Manual COBRA NC 1000 B WCV_EN_enProduct Description​ | 2

2.3

Start Controls
The machine comes without start controls. The control of the machine is to be provided in thecourse of installation.
The machine can be equipped with a soft-starter or a variable speed drive (not included in the scopeof supply).

2.4

Standard Features

2.4.1

Water Cooling
The machine is cooled by a cooling liquid circuit in the cylinder cover and cylinder.
The cooling liquid pump (CLP) allows a recirculating flow in the cooling liquid chamber.
The cooling liquid is cooled by a plate heat exchanger (PHE) which must be connected to the water
main.

2.4.2

Resistance Thermometer
The resistance thermometer monitors the cooling liquid temperature of the machine.
A trip signal must be set. The machine must be stopped when the cooling liquid temperature reaches 70 °C.

2.4.3

Level Switch
The level switch monitors the cooling liquid level in the cylinder.
The machine must be stopped when the cooling liquid level is too low.

2.4.4

Thermometer
The thermometer allows a visual display of the cooling liquid temperature.

2.4.5

Sealing Systems
The machine is equipped with labyrinth seals on the motor side and suction side.
Other sealing systems are optionally available, see Mechanical Seals [➔ 8].
Sealing systems prevent the process gas going to the bearings chambers.
Depending on the application, the sealing systems efficiency can be improved with a barrier gas system, see Barrier Gas System [➔ 7].

2.5

Optional Accessories

2.5.1

Gas Ballast Valve
The gas ballast valve mixes the process gas with a limited quantity of ambient air to counteract thecondensation of vapor inside the machine.
The gas ballast valve has an influence on the ultimate pressure of the machine, see Technical Data.
A ball valve enables to open or close the gas ballast flow.

2.5.2

Silencer
A silencer at the discharge connection (OUT) can be provided to reduce the exhaust gas noise.

2.5.3

Barrier Gas System
The barrier gas system allows the supply of compressed air or nitrogen into the motor side shaft
seals to improve the sealing efficiency.

Instruction Manual COBRA NC 1000 B WCV_EN_en

7 | 402 | Product Description​

2.5.4

Mechanical Seals
The sealing systems can be equipped with mechanical seals. The following variants are possible:● Oil lubricated single mechanical seals on the motor side and labyrinth seals on the suction side.
● Oil lubricated single mechanical seals on the motor side and suction side.

8 | 40Instruction Manual COBRA NC 1000 B WCV_EN_enTransport​ | 3

3Transport
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.

NOTICEIn case the machine is already filled with oil.
Tilting a machine that is already filled with oil can cause large quantities of oil to ingress into
the cylinder.
● Drain the oil prior to every transport or always horizontally transport the machine.
● To find out the weight of the machine, refer to the chapter Technical Data or the nameplate (NP).

● 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 1000 B WCV_EN_en

9 | 404 | Storage​

4

Storage● Seal all apertures with adhesive tape or reuse provided caps.
If the machine is to be stored for more than 3 months:● Wrap the machine in a corrosion inhibiting film.
● Store the machine indoors, in a dry and dust free environment and if possible, in original packaging, preferably at temperatures between 5 ... 55 °C.

NOTICELong storage time.
Risk of damage to the machine!
● If the machine is equipped with oil lubricated mechanical seals, we recommend to completely fill
the oil chamber before a long storage, see “Oil filling” in chapter Oil Change [➔ 26]. This protects
the mechanical seals during a long storage. Use the standard pump oil, see chapter Oil [➔ 37].
● Before restarting the machine, drain the oil to the normal oil level, see “Oil draining” in chapter Oil
Change [➔ 26].

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Instruction Manual COBRA NC 1000 B WCV_EN_enInstallation​ | 5

5Installation

5.1

Installation Conditions
WARNING
If the machine is installed in a potentially explosive environment or if the machine is used to
draw toxic, inflammable or non-inert gases:
Risk of injuries!
Risk of death!
● Ensure that the machine complies with all local, national rules and safety regulations.

NOTICEUse of the machine outside of the permitted installation conditions.
Risk of premature failure!
Loss of efficiency!
● Make sure that the installation conditions are fully respected.
● Make sure that the environment of the machine is not potentially explosive.
● Make sure that the ambient conditions comply with the Technical Data.
● Make sure that the environmental conditions comply with the protection class of the motor andthe electrical elements.
● Make sure that the installation space or location is vented such that sufficient cooling of the machine is provided.
● Make sure that cooling air inlets and outlets of the motor fan are not covered or obstructed andthat the cooling air flow is not affected adversely in any other way.
● Make sure that the oil sight glass (OSG) remains easily visible.
● Make sure that enough space remains for maintenance work.
● Make sure that the machine is placed or mounted horizontally, a maximum deviation of 1° in any
direction is acceptable.
● Check the oil level, see Oil Level Inspection [➔ 25].
● Check the cooling liquid level, see Cooling Liquid Level Inspection [➔ 26].
● Make sure that the cooling water complies with the requirements, see Cooling Water Connection[➔ 13].
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.

5.2

Connecting Lines / Pipes● Remove all protective covers before installation.
● Make sure that the connection lines cause no stress on the connections of the machine. Therefore, we recommend installing flexible joints on the suction and discharge connections.
● Make sure that the line size of the connection lines over the entire length is at least as large as
the connections of the machine.
In case of long connection lines, it is advisable to use larger line sizes in order to avoid a loss of efficiency. Seek advice from your Busch representative.

Instruction Manual COBRA NC 1000 B WCV_EN_en

11 | 40

5 | Installation​

5.2.1

Suction Connection

WARNING
Unprotected suction connection.
Risk of severe injury!
● Do not put hand or fingers in the suction connection.

NOTICE
Ingress of foreign objects or liquids.
Risk of damage to the machine !
If the inlet gas contains dust or other foreign solid particles:● Install a suitable filter (5 micron or less) upstream from the machine.
Connection size(s):– DN125 PN16, EN 1092-1
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 fromturning backwards.
● Make sure that the connection lines cause no stress on the connections of the machine. Therefore, we recommend installing flexible joints on the suction and discharge connections.

5.2.2

Discharge Connection

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 thedischarge line or use it as a pressurized air source.
Connection size(s):At the machine discharge connection:– DN125 PN16, EN 1092-1
At the silencer (SI) discharge connection (two optional versions available):– DN125 PN16, EN 1092-1– DN100 ISO-K, DIN 28404● Make sure that the connection lines cause no stress on the connections of the machine. Therefore, we recommend installing flexible joints on the suction and discharge connections.
● Make sure that the counter pressure (also called “back pressure”) at the discharge connection(OUT) does not exceed the maximum allowable discharge pressure, see Technical Data.

12 | 40

Instruction Manual COBRA NC 1000 B WCV_EN_enInstallation​ | 5

5.2.3

Cooling Water Connection

CWI

CWO

PHE

Description
CWI

Cooling water inlet

PHE

Plate heat exchanger

CWO

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

15

Water pressurebar (g)1 ... 6

Supply temperature°C+5 ... +30

Required pressure differential across supply
and returnbar (g)≥1● To reduce the maintenance effort and ensure a long product lifetime, we recommend the following cooling water quality:
Hardness

mg/l (ppm)< 90

Properties

Clean & clear

PH value

7 ... 8

Particle size

µm

< 200

Chloride

mg/l

< 100

Electrical conductivity

µS/cm

≤ 100

Free chloride

mg/l

< 0.3

Materials in contact with the cooling water

Stainless steel

NOTE
Water hardness unit conversion.
1 mg/l (ppm) = 0.056 °dh (german degree) = 0.07 °e (english degree) = 0.1 °fH (french degree)

Instruction Manual COBRA NC 1000 B WCV_EN_en

13 | 40

5 | Installation​

5.2.4

Barrier Gas System Connection (Optional)
Without nitrogen panel

FME

MAN

BGC

PRV

FR

Description
BGC

Barrier gas connection

FME

Flow meter

FR

Flow regulator

MAN

Manometer

PRV

Pressure regulating valve● Connect the barrier gas connection (BGC) to the gas supply.
Connection size:– G1/4, ISO 228-1● Make sure that the gas complies with the following requirements:

14 | 40

Gas type

Dry nitrogen or air

Gas temperature°C

0 ... 60

Maximum gas pressurebar (g)13

Recommended pressure setting at the pressure regulating valve (PRV)

bar (g)3

Filtrationµm

5

Recommended flow rate

SLM (standard liter per minute)30

Air quality (only for air)Acc. to ISO
8573-1

Class 5.4.4.

Instruction Manual COBRA NC 1000 B WCV_EN_enInstallation​ | 5

5.3

Filling Oil
NOTICEUse 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.
For oil type and oil capacity see Technical Data and Oil [➔ 37].

Instruction Manual COBRA NC 1000 B WCV_EN_en

15 | 40

5 | Installation​
When the oil filling is achieved:● 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.

5.4

Filling Cooling Liquid
For cooling liquid type and cooling liquid capacity see Technical Data and Cooling Liquid [➔ 36].

16 | 40

Instruction Manual COBRA NC 1000 B WCV_EN_enInstallation​ | 5

5.5

Fitting the Coupling
NOTE
Radial screw.
For trouble-free operation, use thread locking glue to secure the radial screw.
1

2

3

4

Description
1

Coupling hub (machine side)2

Coupling spider

3

Coupling hub (motor side)

4

Radial screw / max. admissible torque:
10Nm

Machine type

Coupling size®

NC 1000 B

ROTEX 48

Value “E” (mm)28

In case of a machine delivery without motor:● Fit the second coupling hub on the motor shaft (separately delivered).
● Axially adjust the hub in such a way until value "E" is reached.
● When the coupling adjustment is done, lock the coupling hub by tightening the radial screw.
● Mount the motor on the machine by including the coupling spider.
For further coupling information, go to www.ktr.com and download the instruction manual of the ROTEX® coupling.
EnglishGermanFrenchInstruction Manual - English

Instruction Manual - German

Instruction Manual - FrenchInstruction Manual COBRA NC 1000 B WCV_EN_en

17 | 40

6 | Electrical Connection​

6

Electrical Connection
DANGER
Live wires.
Risk of electrical shock.
● Electrical installation work must only be executed by qualified personnel.

CURRENT PROTECTION OF THE CUSTOMER INSTALLATION:DANGER
Missing current protection.
Risk of electrical shock.
● Current protection in accordance with EN 60204-1 must be provided by the customers on their installation(s).
● The electrical installation must comply with the applicable national and international standards.

NOTICE
Electromagnetic compatibility.
● Make sure that the motor of the machine will not be affected by electric or electromagnetic disturbance 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 network system, if necessary, provide further interference suppression (EMC of the machine, see EU
Declaration of Conformity [➔ 38] or UK Declaration of Conformity [➔ 39]).

6.1

Machine delivered without Control Box or Variable
Speed Drive (VSD)DANGER
Live wires.
Risk of electrical shock.
● Electrical installation work must only be executed by qualified personnel.
● Make sure that the power supply for the motor is compatible with the data on the nameplate of
the motor.
● If the machine is equipped with a power connector, install a residual current protective device toprotect persons in case of a defective insulation.
● Busch recommends installing a type B residual protective device suitable for the electrical installation.
● Provide a lockable disconnect switch or an emergency stop switch on the power line so that themachine is completely secured in case of an emergency situation.

18 | 40

Instruction Manual COBRA NC 1000 B WCV_EN_enElectrical Connection​ | 6● Provide a lockable disconnect switch on the power line so that the machine is completely secured
during maintenance tasks.
● Provide an overload protection according to EN 60204-1 for the motor.
● Connect the protective earth conductor.
● Electrically connect the motor.

NOTICEThe motor frequency is below 30 Hz.
Risk of damage to the machine!
● The motor nominal speed must always be higher than 1800 min-1 (30 Hz).

NOTICEThe admissible motor nominal speed exceeds the recommendation.
Risk of damage to the machine!
● Check the admissible motor nominal speed (nmax) on the nameplate of the machine (NP).
● Make sure to comply with it.
● Consult the Technical Data to get more information.

NOTICE
Incorrect connection.
Risk of damage to the motor!
● The wiring diagrams given below are typical. Check the inside of the terminal box for motor connection instructions/diagrams.

6.2

Wiring Diagram Three-Phase Motor (Pump Drive)
Delta connection (low voltage):Star connection (high voltage):

Instruction Manual COBRA NC 1000 B WCV_EN_en

19 | 40

6 | Electrical Connection​

NOTICE
Incorrect direction of rotation.
Risk of damage to the machine!
● Operation in the wrong direction of rotation can destroy the machine in a short time! Prior tostart-up, ensure that the machine is operated in the right direction.
The intended rotation direction of the motor is defined by the illustration below:● Jog the motor briefly.
● 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.

6.3

Electrical Connection of the Monitoring Devices
NOTE
To prevent potential nuisance alarms, Busch recommends that the control system is configured with a time delay of at least 20 seconds.

6.3.1

Wiring Diagram Resistance Thermometer
Part no.: 0651 552 252
Connector: M12x1, 4-pin
U = 7.5 … 30 VDC; 4 ... 20 mA ► -50 ... 150 °C
Trip signal: Ttrip: 70 °C

1 = Brown; 3 = Blue

20 | 40

Instruction Manual COBRA NC 1000 B WCV_EN_enElectrical Connection​ | 6

6.3.2

Wiring Diagram Level Switch
Part no.: 0652 569 236
Connector: M12x1, 4-pin
U = 10 … 30 VDC (DC-PNP); Imax = 200 mA
Contact: Normally closed
Switch point: Ltrip ► pin 1 + 4 ► low level “stop the machine”

1 = Brown; 3 = Blue; 4 = Black

Instruction Manual COBRA NC 1000 B WCV_EN_en

21 | 40

7 | 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 people are present in the vicinity of a machine that is not insulated from noise for extended periods of time:● Make sure to wear hearing protection.

NOTICEThe machine can be shipped without oil.
Operation without oil will ruin the machine in short time!
● Prior to commissioning, the machine must be filled with oil, see Filling Oil [➔ 15].

NOTICEThe machine can be shipped without cooling liquid.
Operation without cooling liquid will ruin the machine in short time!
● Prior to commissioning, the machine must be filled with cooling liquid, see Filling Cooling Liquid[➔ 16].

NOTICE
Lubricating a dry running machine (compression chamber).
Risk of damage to the machine!
● Do not lubricate the compression chamber of the machine with oil or grease.
● Make sure that the Installation Conditions [➔ 11] are met.
● Turn on the water supply.
If the machine is equipped with a barrier gas system:● Turn on the barrier gas supply.
● 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.

22 | 40

Instruction Manual COBRA NC 1000 B WCV_EN_enCommissioning​ | 7● Make sure that the operating conditions comply with the Technical Data.
● After a few minutes of operation, perform an Oil Level Inspection [➔ 25].
● After a few minutes of operation, perform a Cooling Liquid Level Inspection [➔ 26].
As soon as the machine is operated under normal operating conditions:● Measure the motor current and record it as reference for future maintenance and troubleshooting work.

7.1

Conveying Condensable Vapors
CAUTION
Draining the condensate while operating and/or venting the machine.
The discharged gases and/or liquids may reach temperatures above 70°C!
Risk of burns!
● Avoid direct contact with the flow of gases and/or liquids.

CAUTION
Noise of running machine.
Risk of damage to hearing!
If people are present in the vicinity of a machine that is not insulated from noise for extended periods of time:● Make sure to wear hearing protection.
The machine, equipped either with a gas ballast valve or a dilution gas system, is suitable for theconveyance of condensable vapors within the gas flow.
If condensable vapors are to be conveyed:
START● Open the gas ballast valve* or the dilution gas system* (solenoid valve)● Warm up the machine for 30 minutes● Open the inlet valve● Perform the process● Close the inlet valve● Wait 30 minutes● Close the gas ballast valve* or the dilution gas system* (solenoid valve)
END* Optional accessories● Continuously drain condensate from the condensate drain plug (CD) of the silencer (SI) (Optional).

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8 | Maintenance​

8

Maintenance
DANGER
Live wires.
Risk of electrical shock.
● Electrical installation work must only be executed by qualified personnel.

DANGER
Live wires. Carry out any work on the variable speed drive and motor.
Risk of electrical shock!
● Electrical installation work must only be executed by qualified personnel.

WARNING
The machine is contaminated with hazardous material.
Risk of poisoning!
Risk of infection!
If the machine is contaminated with hazardous material:● Wear appropriate personal protective equipment.

CAUTION
Hot surface.
Risk of burns!
● Before doing anything that requires touching the machine, let it cool down first.

CAUTION
Failing to properly maintain the machine.
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!
● Do not use incompatible solvents to clean the machine.

24 | 40

Instruction Manual COBRA NC 1000 B WCV_EN_enMaintenance​ | 8● Shut down the machine and lock against inadvertent start up.
● Turn off the water supply.
If the machine is equipped with a barrier gas system:● Close the barrier gas supply.
● Vent the connected lines to atmospheric pressure.
If necessary:● Disconnect all connections.

8.1

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 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.
Interval

Maintenance work

Monthly● Check the oil level, see Oil Level Inspection [➔ 25].
● Check the cooling liquid level, see Cooling Liquid Level Inspection [➔ 26].
● Check the machine for oil leaks. In case of leaks, have themachine repaired (Contact Busch).

Yearly● Carry out a visual inspection and clean the machine fromdust and dirt.
● Check the electrical connections and the monitoring devices.

YearlyIf one or more of these accessories are installed.

● Check the filter of the gas ballast valve (GB) and change it ifnecessary, see Replacing the Gas Ballast Filter (Optional)[➔ 26].
● Check the silencer (SI) and clean it if necessary.

Every 5000 hours or after 1 year

● Change the oil of the gear and bearing housings (bothsides), see Oil Change [➔ 26].
● Change the cooling liquid, see Cooling Liquid Change[➔ 29].
● Clean the magnetic plugs (MP).

Every 16000 hours or after 4
years

8.2

● Carry out a major overhaul on the machine (Contact Busch).

Oil Level Inspection● Shut down the machine.
● When the machine is stopped, wait 1 minute before checking the oil level.

Instruction Manual COBRA NC 1000 B WCV_EN_en

25 | 40

8 | Maintenance​● Make sure that the oil level is between the middle of the oil sight glass and 3mm above it.
● Fill up if necessary, see Oil Filling [➔ 15].

8.3

Cooling Liquid Level Inspection● Shut down the machine.

● Fill up if necessary, see Filling Cooling Liquid [➔ 16].

8.4

Replacing the Gas Ballast Filter (Optional)

2

1

Description
1

8.5

Discard the used part2

Gas ballast filter - Part No. 0562 550
434 (Busch genuine spare part)

Oil Change
NOTICEUse 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.

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Instruction Manual COBRA NC 1000 B WCV_EN_enMaintenance​ | 8

1

Description
1

Magnetic plug1

Description
1

Magnetic plug

For oil type and oil capacity see Technical Data and Oil [➔ 37].

Instruction Manual COBRA NC 1000 B WCV_EN_en

27 | 40

8 | Maintenance​

When the oil filling is achieved:● Write down the oil change date on the sticker.

If there is no sticker (part no. 0565 568 959) on the machine:

28 | 40

Instruction Manual COBRA NC 1000 B WCV_EN_enMaintenance​ | 8● Order it from your Busch representative.

8.6

Cooling Liquid Change

21

Description
1

Funnel or liquid deflector

2

Funnel or liquid deflector

For cooling liquid type and cooling liquid capacity see Technical Data and Cooling Liquid [➔ 36].

Instruction Manual COBRA NC 1000 B WCV_EN_en

29 | 40

9 | Overhaul​

9OverhaulWARNING
The machine is contaminated with hazardous material.
Risk of poisoning!
Risk of infection!
If the machine is contaminated with hazardous material:● Wear appropriate personal protective equipment.

NOTICE
Improper assembly.
Risk of premature failure!
Loss of efficiency!
● Any dismantling of the machine that goes beyond anything that is described in this manual
should be done by Busch authorized technicians.
In case of the machine having conveyed gas that was contaminated with foreign materials which are
dangerous to health:● Decontaminate the machine as much as possible and state the contamination status in a ‘Declaration of Contamination’.
Busch will only accept machine accompanied by a signed, fully completed and legally binding "declaration of contamination", downloadable from the following link: buschvacuum.com/declaration-ofcontamination.

30 | 40

Instruction Manual COBRA NC 1000 B WCV_EN_en

Decommissioning​ | 10

10

Decommissioning
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.
● Shut down the machine and lock against inadvertent start up.
● Disconnect the power supply.
● Turn off the water supply.
If the machine is equipped with a barrier gas system:● Close the barrier gas supply.
● Vent the connected lines to atmospheric pressure.
● Disconnect all connections.
If the machine is to be stored:● See Storage [➔ 10].

10.1

Dismantling and Disposal● Drain and collect the oil.
● Make sure that no oil drips onto the floor.
● Drain and collect the cooling liquid.
● 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 1000 B WCV_EN_en

31 | 40

11 | Spare Parts​

11

Spare Parts
NOTICEUse 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 correctfunctioning of the machine and to validate the warranty.
There are no standard spare parts kits available for this product.
If you require Busch genuine parts:● Contact your Busch representative.

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Instruction Manual COBRA NC 1000 B WCV_EN_enTroubleshooting​ | 12

12

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.
ProblemPossible Cause

RemedyThe machine does not start.

The motor is not supplied withthe correct voltage.

● Check the power supply.

The rotors are jammed or
seized.

● Turn the screw rotors manually from the rotor accessplug (PMR).
● Repair the machine (contact
Busch).

Solid foreign matter has entered the machine.

● Remove the solid foreign
matter or repair the machine (contact Busch).
● Install an inlet filter if necessary.

The machine does not reachthe usual pressure on the suction connection.

Instruction Manual COBRA NC 1000 B WCV_EN_en

The resistance thermometer(TSA) reached the switch point.

● Let the machine cool down.

Corrosion in the machine fromremaining condensate.

● Repair the machine.

The motor is defective.

● Replace the motor.

Suction or discharge lines toolong or section diameter too
small.

● Use larger diameter or
shorter lines.

Process deposits on the pumping components● Flush the machine.

The machine runs in the wrong
direction.

● Check the direction of rotation, see Wiring Diagram
Three-Phase Motor (Pump
Drive) [➔ 19].

Internal parts are worn or
damaged.

● Repair the machine (contact
Busch).

● See problem “The machineruns too hot”.
● Check the process and follow the recommendation incase of Conveying Condensable Vapors [➔ 23].

● Seek advice from your local
Busch representative.

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12 | Troubleshooting​ProblemPossible Cause

RemedyThe machine runs very noisily.

Wrong oil quantity or unsuitable oil type.

● Use one of the recommended oils in the correct quantity, see Oil [➔ 37].

Defective gears, bearings orcoupling element.

● Repair machine (contact
Busch).

Insufficient cooling.

● Make sure to comply withthe cooling water requirements, see Cooling Water
Connection [➔ 13].

Ambient temperature too high.

● Observe the permitted ambient temperature, seeTechnical Data.

Temperature of the processgases at the inlet too high.

● Observe the permitted gas
inlet temperature, see Technical Data.

The cooling water pump is defective.

● Repair the machine.

Oil level too low.

● Top up oil.

Oil change intervals are toolong.

● Drain the oil and fill in newoil, see Oil Change [➔ 26].

The machine runs too hot.

● See problem "The machineruns too hot".

The machine runs too hot.

The oil is black.

For resolution of problems not listed in the troubleshooting table, please contact your Busch representative.

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Instruction Manual COBRA NC 1000 B WCV_EN_en

Technical Data​ | 13

13

Technical Data
NC 1000 B
Pumping speed (50 / 60 Hz)

m³/h

840 / 1000

Ultimate pressure without gas-ballast(50 / 60 Hz)

hPa (mbar) abs.

≤ 0.05 / ≤ 0.01

Ultimate pressure with gas-ballast(50 / 60 Hz)

hPa (mbar) abs.

≤ 0.5 / ≤ 0.5

Nominal motor rating (50 / 60 Hz)

kW

22 / 25

Nominal motor speed (50 / 60 Hz)

min⁻¹

3000 / 3600

Noise level (ISO 2151) (50 / 60 Hz)

dB(A)≤ 75 / ≤ 81

Ambient temperature range°C

5 ... 50

Maximum allowable counter pressure atdischargehPa (mbar) rel.

200

Maximum allowable gas inlet temperatureaccording to the inlet pressure°C

Relative humidity

at 30°C≤ 50 hPa (mbar) abs. ► 200> 50 hPa (mbar) abs. ► 70

Ambient pressure

90%
Atmospheric pressure

Cooling water requirements

See Cooling Water Connection[➔ 13]

Oil capacity - Motor sidel

1.3

Oil capacity - Suction sidel

1.5

Cooling liquid capacity approx.

l

44

Weight approx.

kg

1500

Instruction Manual COBRA NC 1000 B WCV_EN_en

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14 | Cooling Liquid​

14

Cooling Liquid
Zitrec M® (Ready-to-use)
Part number 5 L packaging

0831 563 469

Part number 20 L packaging

0831 238 761

Zitrec® M coolant (Cooling liquid) is ready-to-use and requires no additional water.
For more information, visit www.arteco-coolants.com.

36 | 40

Instruction Manual COBRA NC 1000 B WCV_EN_enOil​ | 15

15

Oil
VSC 100
ISO-VG100

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 1000 B WCV_EN_en

37 | 40

16 | EU Declaration of Conformity​

16

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 Declaration of Conformity is issued under the sole responsibility of the manufacturer.
When this machine is integrated into a superordinate machinery the manufacturer of the superordinate machinery (this can be the operating company, too) must conduct the conformity assessment process for the superordinate machine or plant, issue the Declaration of Conformity for it and affix
the CE-marking.
The manufacturer

Ateliers Busch S.A.
Zone Industrielle
CH-2906 Chevenez

declares that the machine: COBRA NC 1000 B; COBRA NX 1000 B
fulfill(s) all the relevant provisions from EU directives:–‘Machinery’ 2006/42/EC–‘Electromagnetic Compatibility’ (EMC) 2014/30/EU–‘RoHS’ 2011/65/EU Restriction of the use of certain hazardous substances in electrical and electronic equipment (incl. all related applicable amendments)

and comply(-ies) with the following harmonized standards that have been used to fulfill those provisions:Standards

Title of the Standard

EN ISO 12100 : 2010

Safety of machinery - Basic concepts, general principles of design

EN ISO 13857 : 2019

Safety of machinery - Safety distances to prevent hazard zones being reached by the upper and lower
limbs

EN 1012-2 : 1996 + A1 : 2009

Vacuum pumps - Safety requirements - Part 2

EN ISO 2151 : 2008

Acoustics - Noise test code for compressors and vacuum pumps - Engineering method (grade 2)

EN 60204-1 : 2018

Safety of machinery - Electrical equipment of machines - Part 1: General requirements

EN IEC 61000-6-2 : 2019

Electromagnetic compatibility (EMC) - Generic standards. Immunity for industrial environments

EN IEC 61000-6-4 : 2019

Electromagnetic compatibility (EMC) - Generic standards. Emission standard for industrial environments

Legal person authorized to compile the technical file and authorized representative in the EU (ifthe manufacturer is not located in the EU):

Busch Dienste GmbH
Schauinslandstr. 1
DE-79689 Maulburg

Chevenez, 01.03.2023

Christian Hoffmann, General Manager

38 | 40

Instruction Manual COBRA NC 1000 B WCV_EN_en

UK Declaration of Conformity​ | 17

17

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 Declaration of Conformity is issued under the sole responsibility of the manufacturer.
When this machine is integrated into a superordinate machinery the manufacturer of the superordinate machinery (this can be the operating company, too) must conduct the conformity assessment process for the superordinate machine or plant, issue the Declaration of Conformity for it and affix
the UKCA-marking.
The manufacturer

Ateliers Busch S.A.
Zone Industrielle
CH-2906 Chevenez

declares that the machine: COBRA NC 1000 B; COBRA NX 1000 B
fulfill(s) all the relevant provisions from UK legislations:–

Supply of Machinery (Safety) Regulations 2008–

Electromagnetic Compatibility Regulations 2016–

Restriction of the use of certain hazardous substances in Electrical and Electronic Equipment Regulations 2012

and comply(-ies) with the following designated standards that have been used to fulfill those provisions:Standards

Title of the Standard

EN ISO 12100 : 2010

Safety of machinery - Basic concepts, general principles of design

EN ISO 13857 : 2019

Safety of machinery - Safety distances to prevent hazard zones being reached by the upper and lower
limbs

EN 1012-2 : 1996 + A1 : 2009

Vacuum pumps - Safety requirements - Part 2

EN ISO 2151 : 2008

Acoustics - Noise test code for compressors and vacuum pumps - Engineering method (grade 2)

EN 60204-1 : 2018

Safety of machinery - Electrical equipment of machines - Part 1: General requirements

EN IEC 61000-6-2 : 2019

Electromagnetic compatibility (EMC) - Generic standards. Immunity for industrial environments

EN IEC 61000-6-4 : 2019

Electromagnetic compatibility (EMC) - Generic standards. Emission standard for industrial environments

Legal person authorized to compile the technical file and importer in the UK (if the manufacturer Busch (UK) Ltd
is not located in the UK):
30 Hortonwood
Telford – UK
Chevenez, 01.03.2023

Christian Hoffmann, General Manager

Instruction Manual COBRA NC 1000 B WCV_EN_en

39 | 40

Busch
Vacuum Solutions
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.
Whatever your business. We are there for you.

●Busch companies and Busch employees●

Local representatives and distributors●

Busch production site

0870551589 | A0005_en-US

www.buschvacuum.com