BUSCH COBRA NX 0950 A PLUS User manual

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Instruction Manual
COBRA PLUS
Dry Screw Vacuum Pumps
NX 0950 A PLUS
0870232499/-_en / Original instructions / Modifications reserved 27/01/2021
Ateliers Busch S.A.
Zone industrielle, 2906 Chevenez
Switzerland

Table of Contents
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Table of Contents
1 Safety .......................................................................................................................................4
2 Product Description ..................................................................................................................5
2.1 Operating Principle .......................................................................................................... 7
2.2 Application....................................................................................................................... 7
2.3 Standard Features ............................................................................................................ 8
2.3.1 User Interface........................................................................................................8
2.3.2 Acoustic Cabinet ...................................................................................................8
2.3.3 Control Unit .......................................................................................................... 8
2.3.4 Monitoring Devices ............................................................................................... 8
2.3.5 I/O and Communication Port ................................................................................8
2.3.6 Gas Ballast Valve ................................................................................................... 9
2.3.7 Inlet Check Valve ..................................................................................................9
2.3.8 Water Cooling.......................................................................................................9
2.3.9 Sealing Systems .....................................................................................................9
2.3.10 Silencer.................................................................................................................. 9
2.3.11 Barrier Gas System................................................................................................. 9
2.3.12 Oil Level Switches .................................................................................................10
2.3.13 Exhaust Pressure Sensor ........................................................................................10
2.4 P&ID "Piping and Instrumentation Diagram"................................................................... 10
2.5 LED Indicators .................................................................................................................. 11
2.6 Description of User Interface Functions ............................................................................ 11
2.6.1 Menu Overview .................................................................................................... 11
2.6.2 Bottom Bar ............................................................................................................ 12
2.6.3 Navigation............................................................................................................. 12
2.6.4 Role and User........................................................................................................13
2.6.5 System Settings ..................................................................................................... 14
2.6.6 Machine and Software Identification ..................................................................... 15
2.6.7 Ethernet Settings ................................................................................................... 15
2.7 Web Visualization ............................................................................................................ 16
3 Transport ..................................................................................................................................19
4 Storage .....................................................................................................................................20
5 Installation................................................................................................................................21
5.1 Installation Conditions...................................................................................................... 21
5.2 Connecting Lines / Pipes .................................................................................................. 22
5.2.1 Suction Connection ............................................................................................... 22
5.2.2 Discharge Connection ...........................................................................................22
5.2.3 External Inlet Pressure Sensor ................................................................................ 23
5.2.4 Cooling Water Connection .................................................................................... 23
5.2.5 Barrier Gas System Connection..............................................................................24
5.3 Filling Oil.......................................................................................................................... 25
5.4 Gas Ballast Opening and Closing...................................................................................... 27
5.5 Electrical Connection ........................................................................................................ 28
5.5.1 Wiring Diagram Control Unit................................................................................. 29
6 Commissioning.........................................................................................................................30
6.1 Prerequisites Before Use ................................................................................................... 30
6.2 Configuration................................................................................................................... 31
6.3 Start Up ........................................................................................................................... 31
7 In Operation .............................................................................................................................33
7.1 Control Mode .................................................................................................................. 33
7.1.1 Local/Manual ........................................................................................................ 34

Table of Contents
0870232499_NX0950A_PLUS_-_IM_en 3
7.1.2 Local/Auto "Week Planner".................................................................................. 34
7.1.3 Remote/Auto ........................................................................................................ 35
7.2 Operating Mode .............................................................................................................. 36
7.2.1 Speed Control .......................................................................................................36
7.2.2 Pressure Control .................................................................................................... 37
7.3 Ecomode .......................................................................................................................... 37
7.4 Warm-up / Cool-down Modes......................................................................................... 38
7.4.1 Conveying Condensable Vapours .......................................................................... 39
7.5 Inlet Valve Control ........................................................................................................... 40
7.6 Vacuum Booster Control .................................................................................................. 42
7.7 Monitoring....................................................................................................................... 44
7.7.1 Operating Information ..........................................................................................44
7.7.2 Operating Data ..................................................................................................... 45
7.7.3 History .................................................................................................................. 48
7.7.4 Operating Curves .................................................................................................. 49
7.8 Dysfunction...................................................................................................................... 50
7.8.1 Warnings and Alarms Thresholds........................................................................... 50
7.8.2 Warning/Alarm Acknowledgment Procedure......................................................... 51
7.9 Stop the Machine............................................................................................................. 52
8 Maintenance.............................................................................................................................52
8.1 Maintenance Schedule ..................................................................................................... 53
8.2 Oil Level Inspection.......................................................................................................... 55
8.3 Cleaning the Inlet Screen.................................................................................................. 56
8.4 Cleaning the Gas Ballast Filter .......................................................................................... 57
8.5 Cleaning the Silencer........................................................................................................ 58
8.6 Oil Change....................................................................................................................... 60
8.7 Machine Cleaning ............................................................................................................ 63
9 Overhaul...................................................................................................................................64
10 Decommissioning.....................................................................................................................64
10.1 Dismantling and Disposal ................................................................................................. 64
11 Spare Parts................................................................................................................................65
12 Troubleshooting .......................................................................................................................65
13 Technical Data..........................................................................................................................69
14 Oil ............................................................................................................................................69
15 EU Declaration of Conformity...................................................................................................70

1 | Safety
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1 Safety
Prior to handling the machine, this instruction manual should be read and understood. If
anything needs to be clarified, please contact your Busch representative.
Read this manual carefully before use and keep for future reference.
This instruction manual remains valid as long as the customer does not change anything
on the product.
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 according to state-of-the-art meth-
ods. Nevertheless, residual risks may remain. 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.
NOTE
... indicates helpful tips and recommendations, as well as information for efficient and
trouble-free operation.

Product Description | 2
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2 Product Description
INOUT
CU
VP
HMI PIL
CAO NP
ESSAILSSB
CAI
ACA
COM
CD
ACA
BGC CWICWOCF
PWS
LAN
PWS
ACA Acoustic cabinet AIL Alarm indicator light
BGC Barrier gas connection CAI Cooling air inlet
CAO Cooling air outlet CD Condensate drain
CF Cooling fan COM I/O port (D-Sub 9)
CU Control unit CWI Cooling water inlet
CWO Cooling water outlet ESS Emergency stop switch
HMI User interface (human-machine) IN Suction connection
LAN Communication port (Modbus TCP/IP) NP Nameplate
OUT Discharge connection PIL Power indicator light
PWS Power supply (cable gland) SSB Start/Stop button
VP Vacuum pump

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Vacuum pump (VP)
EB
IN
PMR
BGR
SI
GB
OFP
CWO
BGC
BGM
ODV
BGF
CWD
OSG
CWI
NP
MP
OUT
CD
BGV
LS2 MOT
PSA1
PSA2TSA LS1
MP
WV
WSA OFP
OSG
IS
BGC Barrier gas connection BGF Barrier gas flow meter
BGM Barrier gas manometer BGR Barrier gas pressure regulator
BGV Solenoid valve (barrier gas) CD Condensate drain
CWD Cooling water drain plug CWI Cooling water inlet
CWO Cooling water outlet EB Eye bolt
GB Gas ballast valve IN Suction connection
IS Inlet screen LS1 Level switch (oil level motor side)
LS2 Level switch (oil level inlet side) MOT Motor (pump drive)
MP Magnetic plug NP Nameplate
ODV Oil drain valve OFP Oil fill plug
OSG Oil sight glass OUT Discharge connection
PMR Plug for manual rotation of rotors PSA1 Pressure transmitter (inlet gas pressure)
PSA2 Pressure transmitter
(exhaust gas pressure before silencer)
SI Silencer
TSA Resistance thermometer (pump temp.) WSA Waterflow sensor (cooling liquid)
WV Solenoid valve (cooling water)

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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 machine appearance.
NOTE
Illustrations and displays of the Human-Machine Interface (HMI).
Some of the HMI illustrations which are shown in this manual are taken from the HMI
display of the "R5 RA 0760 A PLUS" vacuum pump. Although they may differ slightly
for the "COBRA NX 0950 A PLUS" vacuum pump, the principles of using of the inter-
face however are similar.
2.1 Operating Principle
The machine works on the one-stage, twin-screw pump principle.
Two screw rotors are rotating inside the cylinder. The pumped medium is trapped
between the cylinder and screw chambers, compressed, and transported to the gas out-
let. During the compression process, the two screw rotors do not come into contact with
each other nor with the cylinder. There is no need for a lubrication or an operating fluid
in the compression chamber.
2.2 Application
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 indoor placement in a non-potentially explosive environ-
ment.
The machine is capable of maintaining ultimate pressure, see Technical Data [►69].
The machine is suitable for continuous operation.
Permitted environmental conditions, see Technical Data [►69].

2 | Product Description
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NOTICE
Chemical compatibility of the process gases with the machine component materials.
Risk of corrosion inside the compression chamber which can reduce performance and
its lifetime!
• Check if the process gases are compatible with those following materials:
- Cast iron
- Steel
- Stainless Steel
- Aluminium
- Fluoroelastomer (FKM/FPM)
• In doubt, please contact your Busch representative.
2.3 Standard Features
2.3.1 User Interface
A user interface, also termed human-machine interface (HMI), allows the control, monit-
oring and configuration of the machine via a 7.5” touchscreen.
Further information in the chapter Description of User Interface Functions [►11].
2.3.2 Acoustic Cabinet
Stylish and functional, the acoustic cabinet (ACA) significantly reduces the sound emitted
by the vacuum pump.
2.3.3 Control Unit
The control unit is an electrical cabinet where a variable-frequency drive, a PLC and
other electrical components are integrated.
It also supplies the active cooling air with electrical current.
The power supply must be connected to it, see Electrical Connection.
2.3.4 Monitoring Devices
The machine is equipped with several monitoring devices to visualise the operating val-
ues, machine conditions and to protect the machine from any severe damage.
The pump temperature, cooling water flow, oil level, inlet gas pressure and counter pres-
sure at the discharge can be displayed when the machine is running, see Monitoring
[►44]
Two signal levels are transmitted, a warning and an alarm/trip, see Warning and Alarm
Signals.
2.3.5 I/O and Communication Port
The control unit (CU) is equipped with two types of communication port that can allow
remote control of the machine:
– D-Sub 9 (Analog and Digital)
– RJ45 (Modbus)
• Refer to the specific document “Pump Control Instructions, art. no.: 0870213261” for
more details or contact your Busch representative.

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2.3.6 Gas Ballast Valve
The gas ballast valve mixes the process gas with a limited quantity of ambient air to
counteract the condensation of vapour inside the machine.
The gas ballast valve has an influence on the ultimate pressure of the machine, see Tech-
nical Data [►69].
2.3.7 Inlet Check Valve
In order to avoid reverse rotation after switching off, the machine is equipped with an in-
let check valve.
The inlet check valve also prevents fast venting of the connected vacuum system.
The inlet check valve is also equipped with a pressure sensor.
Pressure sensor
2.3.8 Water Cooling
The machine is cooled by a cooling water circuit in the cylinder cover and cylinder.
2.3.9 Sealing Systems
The machine is equipped with labyrinth seals on the motor side and suction side.
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 [►9].
2.3.10 Silencer
The silencer reduces the exhaust gas noise at the machine discharge (OUT).
2.3.11 Barrier Gas System
The barrier gas system allows the supply of compressed air or nitrogen into the motor
side shaft seals in order to improve the sealing efficiency.

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2.3.12 Oil Level Switches
The machine is equipped with two oil level switches to monitor the oil levels at the motor
and suction sides.
2.3.13 Exhaust Pressure Sensor
The machine is equipped with an exhaust pressure sensor to monitor the back pressure
at the discharge.
2.4 P&ID "Piping and Instrumentation Diagram"
M
CPL MOT1
GB
Air
NRV
PSA1
Pinlet gas
LS1
low oil level motor side
alarm (trip)
IN
OUT
PSA2
Pexhaust gas
VP
ISO DN100/G3”
M
MOT2
WV
Cooling
Water
G1/2"
G1/2"
WSA
Water Flow
Sensor
G3/8"
Air
BGV
ISO DN100/G3”
CF
LS2
low oil level inlet side
alarm (trip)
TSA
Pump Temperature
T °C
BGV Barrier gas solenoid valve CF Cooling Fan
CPL Coupling GB Gas ballast
IN Suction connection LS1 Level switch “alarm/trip”
(oil level motor side)
LS2 Level switch “alarm/trip”
(oil level inlet side)
MOT1 Motor (pump drive)
MOT2 Motor (Active system cooling) NRV Non-return valve
(not used as an isolation valve)
OUT Discharge connection PSA1 Pressure transmitter
(inlet gas pressure)
PSA2 Pressure transmitter
(exhaust gas pressure before silencer)
TSA Resistance thermometer
(pump safety temperature)
VP Vacuum pump WSA Water flow sensor (cooling liquid)
WV Solenoid valve (cooling water)

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2.5 LED Indicators
Next to the user interface, there are three LED’s which give a visual indication of the ma-
chine state.
The LED is green when
the machine is powered
The LED is green when
the machine is running
The LED flashes in red
when a warning occurred /
The LED is continuously
red when an alarm occurred
Power indicator light (PIL)Start/stop button (SSB) Alarm indicator light (AIL)
2.6 Description of User Interface Functions
The display is divided into three distinct parts.
01.08.2020 - 15:00 ?
Menu tabs
Information
panel
Bottom bar
2.6.1 Menu Overview
The menu consists of four main tabs with their own sub-tabs:
– The tab “HOME”, which is the principal display, is mainly useful for live monitoring.
HOME
MAIN
OPERATIONS
MONITORING
MAINTENANCE SYSTEM
ALARM
– The tab “OPERATIONS” displays the operating parameters/modes and allows con-
trol of the machine.
HOME
MODE
OPERATIONS
PARAMETERS
MAINTENANCE SYSTEM
WEEK PLANNER

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– The tab “MAINTENANCE” displays the history of malfunctions, maintenance inter-
vals and operating curves.
HOME
HISTORY
OPERATIONS
SERVICE
MAINTENANCE SYSTEM
TREND
– The tab “SYSTEM” allows to set or change settings, provides information about the
product and its distributor.
HOME
SETTINGS
OPERATIONS
CONTACT
MAINTENANCE SYSTEM
MODEL ETHERNET
2.6.2 Bottom Bar
The bottom bar provides different pieces of information, in particular the machine state
and warning/alarm status.
?
01.08.2020 - 15:00
OFF
RUNNING
WARNING
ALARM
Machine state
Warnings and alarms
status Date and hour
Screen
brightness
Help
2.6.3 Navigation
When several screens are available in the information panel, dots and “PREVIOUS/
NEXT” buttons are displayed above the bottom bar.
• Press either on a dot or “PREVIOUS/NEXT” button to pass from a screen to another
one.
PREVIOUS NEXT
The switch button is black when it is disabled and orange when it is enabled.
• Press on the switch button to change its state.
If a password is required:
• Enter the password, see the chapter Role and User [►13].
Disabled
Enabled
Off
On
When the character “>” is displayed in a cell of the information panel, that means a step
further is available. For example: a redirect link to another view or to open a specific
editing view.
• Press in the cell to open the next dialog windows.
If a password is required:
• Enter the password, see the chapter Role and User [►13].

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>
>
Date
Target speed
01 / 01 /2019
60 Hz
2.6.4 Role and User
Three roles of user rights are predefined in the system:
– Role 1 ► Operator
This role is intended for machine operators to control the machine (limited rights) or
monitor operating values. It does not require any password.
– Role 2 ► Installation/Maintenance technician
This role is intended for installation/maintenance technicians to configure the machine
according to the application. The password for this role can be found in the separate
sheet attached to this instruction manual and allows an access to the following features:
– change operating mode,
– reset hours before the next service,
– set the remote control and monitoring parameters, refer to the specific document
"Pump Control Instructions, art. no.: 0870213261".
– Role 3 ► Busch Service
Only authorized personnel from Busch Service have this level of access rights.
NOTE
In case of any questions related to the machine settings:
• Please contact Busch Service.
When a password is required, the display shows this screen:
Password
CANCEL
***
SAVE
• Press on the three stars.
• Fill the correct password in the number pad according to your access right.
• Save it.
• From now on, the specific rights are open for a limited period ► delay of 5 minutes.

2 | Product Description
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2.6.5 System Settings
To edit the system settings (such as date/time, language and units):
• Go to “SYSTEM” > “SETTINGS”.
• Press on the value to change the data.
>
>
>
>
>
HOME
SETTINGS
OPERATIONS
CONTACT
MAINTENANCE SYSTEM
MODEL
Date Language
Time Units
mbar
Warnings and alarms thresholds
°C
English01 / 08 / 2020
13 : 48
ETHERNET
Advanced settings
NOTE
Warnings and alarms thresholds
Thresholds can only be changed by Busch Service “Role 3”, see the predefined factory
settings in the chapter Warnings and Alarms Thresholds [►50].
NOTE
Advanced settings
Advanced settings can only be changed by Busch Service “Role 3”, refer to the specific
document "Pump Control Instructions, art. no.: 0870213261".

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2.6.6 Machine and Software Identification
To display the machine and software identification:
• Go to “SYSTEM” > “MODEL”.
HOME
SETTINGS
OPERATIONS
CONTACT
MAINTENANCE SYSTEM
MODEL
Vacuum pump type Vacuum pump model
Software HMI Software PLC
Serial number
COBRA PLUS NX 0950 A
2.02.0
CHM120400012
ETHERNET
2.6.7 Ethernet Settings
To configure the ethernet settings according to your network:
• Go to “SYSTEM” > “ETHERNET”.
• Make sure that the Ethernet port (COM) on the right side of the control unit (CU) of
the machine is connected to a computer or to the company network.
• Change the values on the right side of the screen (Change settings), password re-
quired ► Role 2, see Role and User [►13].
• Press on the switch button to save the new settings.
NOTE
The current Ethernet values are displayed in the left side of the screen (Ethernet settings).
To change these values, it is necessary to fill in all the fields in the right side of the
screen (Change settings) before applying the changes by pressing on the switch but-
ton:
• New IP address
• New subnet mask
• New gateway
ðTo change the Ethernet settings, it is necessary to connect the PLUS pump with the
desired equipment beforehand via the Ethernet port available on the right side of the
control cabinet (LAN - see illustration in the chapter “Product Description” of the in-
struction manual of the vacuum pump).

2 | Product Description
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HOME
SETTINGS
OPERATIONS
CONTACT
MAINTENANCE SYSTEM
MODEL ETHERNET
Off
Ethernet settings
Current IP address
192 . 168 . 0 . 22 0 . 0 . 0 . 0
New IP address
Change settings
0 . 0 . 0 . 0
New subnet maskCurrent subnet mask
0 . 0 . 0 . 0
New gatewayCurrent gateway
255 . 255 . 255 . 0
192 . 168 . 0 . 1
/!\ For a modification of the IP address,
an active Ethernet connection is necessary.
Description Default value
IP address 192.168.0.22
Subnet mask 255.255.255.0
Gateway 192.168.0.1
PLC port (0-65535) 502 (cannot be changed)
PLC Slave no. 247 (F7) (cannot be changed)
2.7 Web Visualization
Each machine has a built-in Web visualization interface, which allows remote monitoring
of the main operating parameters from a computer (via a LAN connection or via an op-
tional WIFI connection), a tablet or a smartphone (via an optional WIFI connection).
To use the Web visualization interface via a LAN connection:
• Connect an Ethernet cable to the Ethernet port (COM) on the right side of the control
unit (CU) of the machine.
• Connect the Ethernet cable to the company network or to the computer. To connect
the Ethernet cable to the computer, use a USB/LAN adapter or connect it directly to
the Ethernet port of the computer and use the internal network card (administrator
access required).
• Check the ethernet settings of the machine in the “Ethernet Settings” menu of the
User Interface Display (HMI), see Ethernet Settings [►15]. By default, the ethernet
settings are:
– IP address: 192.168.0.22
– Subnet mask: 255.255.255.0
– Gateway: 192.168.0.1
• Check the ethernet settings of the computer network (Internet Protocol Version 4
(TCP/IPv4) Properties). The Subnet mask and the first 3 bytes of the IP address must
be the same as on the PLUS machine.

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• Open your web browser (full screen window) and type the IP address of the machine
to monitor in the address bar, followed by: :8080/smartpump.htm. By default, the
whole address to be typed in the web browser is: 192.168.0.22:8080/smartpump.htm
• When the Web visualization interface opens, select “Computer” as monitoring device.
NOTE
The following illustrations are taken from the web visualization of the "R5 RA 0760 A
PLUS" vacuum pump.
• The main screen, “Dashboard”, shows the main operating parameters and settings of
the machine (machine status, operating mode, running hours, inlet pressure,…).
• Use the icons in the bottom bar to navigate in the Web visualization interface.

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• The second page “Service” shows the service table of the machine and Busch service
contact information.
• The third page “My vacuum pump” gives general information about the machine.
NOTE
• Contact Busch:
ðIf the Ethernet port of the machine (COM) is already used for remote control /
monitoring purpose.
OR
ðIn order to use the Web visualization function via a WIFI connection (requires an
optional WIFI module).
• The Web visualization interface is optimized for Google Chrome.
• To change the IP address of the machine (in the event it is already used by another
machine for instance), go to the “Ethernet Settings” menu of the User Interface Dis-
play (HMI) on the machine, see Ethernet Settings [►15].

Transport | 3
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3 Transport
WARNING
Suspended load.
Risk of severe injury!
• Do not walk, stand or work under suspended loads.
WARNING
Transport and lifting.
Risk of severe injury!
• Lift the machine from underneath with care to prevent the load from tipping over.
• Do not use straps, ropes or other lifting means.
NOTICE
In case the machine is already filled with oil.
Tilting a machine that is already filled with oil can cause large quantities of oil to in-
gress into the cylinder.
• Drain the oil prior to every transport or always horizontally transport the machine.
• Check the machine for transport damage.
If the machine is secured to a base plate:
• Remove the machine from the base plate.
As soon as the machine is placed at its final location:
• Remove the reinforcement bar as it can hinder a technician when performing main-
tenance tasks.
• Conserve and remount it for future machine transport.

4 | Storage
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1
¼
3x
2
x2
3
Remove side
cover
• Replace the side cover.
4 Storage
• Seal all apertures with adhesive tape or reuse provided caps.
NOTICE
Long storage time.
Risk of damage to the machine!
• Due to a long storage time the capacitors of the variable-frequency drive can lose effi-
ciency because of electrochemical processes. In the worst case, it can lead to a short-
circuit and therefore to a damage to the variable-frequency drive of the machine.
• Connect the machine every 18 months for 60 minutes to the mains.
If the machine is to be stored for more than 3 months:
• Wrap the machine in a corrosion inhibiting film.
• Store the machine indoors, dry, dust free and if possible in original packaging
preferably at temperatures between 0 ... 30 °C.