BUSCH COBRA NC 400 B Manual

Supplement to the Installation
- and Maintenance manual
COBRA Vacuum Pump with
Magnetic Coupling
Screw Vacuum Pumps
COBRA NC 400 B
Ateliers Busch S.A.
Zone industrielle
2906 Chevenez
Switzerland
0870549497 / 081209 / Original instructions / Modifications reserved

Table of Contents
Introduction.............................2
Product description .........................3
NC400B.............................3
Operating principle ........................3
Safety ................................3
Intended use ...........................3
Safety information ........................3
Use in explosive atmosphere ................4
Use of the magnetic coupling on ATEX category 3 Gi/o
certified pump .........................4
Use of the magnetic coupling on ATEX category 2 Gi/o
certified pump .........................4
Installation and commissioning...................4
Installation Prerequisites .....................4
Fitting .............................4
Maintenance ............................5
Maintenance Precautions .....................5
Fitting the magnetic coupling...................5
Step 1 .............................5
Step 2 .............................5
Step 3 .............................6
Step 4 .............................6
Dismantling the motor/ the lanterne/ the exterior coupling ....6
Fitting the motor/ the lanterne/ the exterior coupling .......7
Inactivity of the vacuum pump for longer periods of time ....7
EC-Declaration of Conformity ...................9
Introduction COBRA Vacuum Pump with Magnetic Coupling
Page 2 0870549497 (EN)
This complement contains further instructions concerning the installa-
tion and operation of the COBRA vacuum pump equipped with ma-
gnetic coupling.
Introduction
Congratulations on the purchase of your Busch vacuum pump. Whilst
always responding to customers’ requirements and through constant
innovation and improvements, Busch delivers modern vacuum and
pressure solutions at the head of Industry worldwide.
This complement to the Roots Installation and Operating Instructions
contains information on
–product description
–safety
–installation
–maintenance
–overhaul
–dismantling
of the vacuum pump with magnetic coupling.
In these instructions, the “handling ” of the vacuum pump implies the
transport, storage, installation, commissioning, influences on operating
conditions, maintenance, troubleshooting and overhaul of the vacuum
pump.
Prior to handling the vacuum pump, these operating instructions must
be read and understood. If you have any doubts, please contact your
Busch representative.
Keep these operating instructions and, if applicable, other relevant ope-
rating instructions available and accessible on site.

Product description
NC 400 B
Operating principle
The COBRA NC 400 B vacuum pumps with magnetic coupling work
according to the tried and tested screw vacuum pump.
The operation of the magnetic coupling pump is identical to that of the
standard coupling.
The use of a magnetic coupling allows to suppress the radial shaft seals
and their lubrication system.
The starting torque of the drive motor must not exceed the nominal
torque of the magnetic coupling. This means:
–145 Nm for COBRA NC 400 B
ATTENTION
The motor start-up is done using a converter which allows a pro-
gressive start-up for about 30 seconds and helps to limit any risks of
possible overheating of the magnetic coupling.
CAUTION
The magnetic coupling has been designed for use under normal
operating conditions.
When running under extreme conditions, the magnetic coupling
can overheat leading to the destruction of the coupling bell and
thus the loss of leak tightness of the pump, as the coupling bell
also ensures that the pump is leak tight.
Safety
Intended use
DEFINITION : To rule out any misunderstanding, the term “ handling ”
of the vacuum pump implies transport, storage, installation and com-
missioning of the pump as well as influences on operating conditions,
maintenance, troubleshooting and overhaul of the vacuum pump.
The vacuum pump is intended for industrial use. It may only be opera-
ted by qualified personnel.
The need for personal safety regulations depends mainly on the appli-
cation the pump will be used in. The end user must provide the opera-
tors with the necessary means and must inform his personnel about
any dangers coming from the processed product.
The end user of the vacuum pump must observe the safety regulations
and must train and instruct his personnel accordingly.
The maintenance instructions must be followed.
These Installation and Maintenance Instructions as well as the standard
Roots pump manual must be read and understood before handling the
vacuum pump. If in any doubts, please contact your Busch representa-
tive.
Safety information
The vacuum pump has been designed and manufactured in accordance
with the latest technical standards and safety regulations. However,
whilst handling the vacuum pump, residual risks do remain.
Various safety instructions can be found in this handbook as well as on
the pump. These safety instructions must be followed. Safety instruc-
tions can be detected through one of the following keywords
DANGER, WARNING and CAUTION as follows :
COBRA Vacuum Pump with Magnetic Coupling Product description
0870549497 (EN) Page 3

WARNING
Strong magnetic field:
“ Persons wearing a pacemaker must keep outside the area of in-
fluence of the magnetic field ” !
Danger to life
Disregard of this safety instruction will always lead to accidents
with potentially fatal injuries or serious damage.
DANGER
Danger of damage to the pump or system
Disregard of this safety instruction will always lead to accidents
with potentially fatal injuries or serious damage.
WARNING
Danger of personal injury
Disregard of this safety instruction will always lead to accidents
with potentially fatal injuries or serious damage.
CAUTION
Disregard of this safety instruction may lead to accidents with minor
injuries or damage to property.
Use in explosive atmosphere
Use of the magnetic coupling on ATEX
category 3 Gi/o certified pump
It is recommended to use a progressive start-up for the vacuum pump
using a frequency inverter.
The temperature class of the coupling under normal operating condi-
tions corresponds to the internal and external temperature classes of
the vacuum pump.
CAUTION
In case of slippage, the coupling will heat up and thus exceed the
temperature class.
The slippage of the coupling can be monitored by the current
consumption of the motor : should it drop by more than 20% in re-
lation to the minimum current consumption of the motor under nor-
mal operating conditions, the pump must be stopped and removed
from the power supply.
Use of the magnetic coupling on ATEX
category 2 Gi/o certified pump
It is recommended to use a progressive start-up for the vacuum pump
using a frequency inverter.
CAUTION
For certified category 2G i/o pumps, the temperature class
must be watched by measuring the surface temperature of the cera-
mic bell using a PT100 temperature sensor installed on the pump.
WARNING
Minimum obligatory monitoring of the coupling for pumps with
certification
II 2G (i/o) IIB T3 (i/o)
Temperature of the magnetic coupling bell with the temperature
sensor TSA+/0106
The vacuum pump must immediately be stopped when one of the mo-
nitoring instruments exceeds the value defined in the “COBRA ATEX
Catalogue”.
It is the customer’s responsibility to operate his vacuum pump in accor-
dance with all security measures linked to the protection against explo-
sions.
DANGER
Any servicing on the pump must only be carried out by specially
trained servicing staff under strict adherence to current and valid
safety regulations. In case of possible risk from dangerous substan-
ces of any kind, the end user of the pump must duly inform and
instruct maintenance staff before any work is carried out.
Before any maintenance work is carried out, any risk to the health
of maintenance staff that could come from drawn substances or
any other substance both within or outside the pump, must be ex-
cluded.
Installation and
commissioning
Installation Prerequisites
●Make sure that the integration of the vacuum pump complies with
the safety requirements of the Machine Directive 2006/42/EC
(concerning the responsibility of the manufacturer of the machine
or installation into which the vacuum pump is to be incorporated;
please also refer to the note in the EC-Declaration of Conformity).
Fitting
●Make sure that the “Installation Prerequisites ” are followed.
●Set up or mount the vacuum pump at its location
Installation and commissioning COBRA Vacuum Pump with Magnetic Coupling
Page 4 0870549497 (EN)

Maintenance
CAUTION
Any dismantling of the vacuum pump that is beyond the scope of
what is described in this manual must be done by specially trained
Busch service personnel only.
CAUTION
During operation the surface of the vacuum pump can exceed tem-
peratures of 90°C.
Risk of burns!
Before starting maintenance work, make sure that the vacuum pump
has been fully switched off and that it cannot accidentally be switched
on again. Follow the procedure for stopping the pump in section
“ Stopping procedure for maintenance ” :
–Switch off the vacuum pump
–Switch off the main power supply
–Put up the warning sign “ Maintenance in progress ” on or next to
the pump
CAUTION
During operation the oil temperature of the vacuum pump can
reach a value of 120°C !
Risk of burns !
After the completion of all maintenance work, follow the procedure
“Start-up procedure after maintenance” “ :
–Remove the sign “ Maintenance in progress ”
–Check the oil levels, top up with oil if necessary,
switch on the main supply
–Make sure that the “Installation Prerequisites” are complied with
–Switch on the vacuum pump
Maintenance Precautions
CAUTION
The following safety instructions are only relevant when dismantling
the magnetic drive system.
DANGER
Keep people wearing a pacemaker away from the influence of the
magnetic field!
Danger to life
DANGER
Label any room, where assembly or dismantling work on the ma-
gnetic coupling system is carried out or where parts of the magne-
tic coupling system are stored, with the danger sign :
“ No trespassing for persons with pacemaker ”
●Do not place the dismantled magnetic coupling into the vicinity of
computers, data carriers and other electronic components.
●Keep all magnetizable parts away from the magnetic coupling.
CAUTION
The powerful magnetic field can influence the functioning and ope-
rational safety of electrical and electronical units.
CAUTION
Improper or incorrect maintenance work on the vacuum pump will
put the safety of operation at risk.
Risk of explosion !
It is strongly advised that any dismantling of the vacuum pump that
goes beyond the scope of what is described in this manual should
be done by specially trained Busch service staff only.
Fitting the magnetic coupling
Step 1
–Carry out an inspection by measuring the length of the spacer (2).
This measurement must be 31,5 mm.
–Fit the spacer (2), and position the shaft key (5) as well as the inner
part of the magnetic coupling (1) onto the rotor shaft.
–Measure the distance between the face of the magnetic coupling's
inner rotor (1) and the supporting face of the cover (4). This value
(x) must be 99,5 mm.
–Use the washer (3) and the screw (6) to fix axially.
Step 2
–Fit the adapter flange (7) with its o-ring (8) into the housing (4)
using the two fixing screws (11)
–Screw and glue the two guiding rods (10) onto the adapter flange
(7).
–Fit the ceramic bell housing (9) of the coupling with its o-ring (15)
onto the adapter flange (7).
COBRA Vacuum Pump with Magnetic Coupling Maintenance
0870549497 (EN) Page 5
X
X= 99,5 mm
217 mm
4
5
2
1
3
6

CAUTION
Please handle the ceramic bell housing carefully to prevent dama-
ging it.
–Tighten up and glue the fixing screws (12) to a maximum torque
of 6 Nm.
Step 3
–Fit the coupling (13) onto the motor shaft (480).
Note: The coupling (13) can come in 2 parts: the exterior rotor of the
coupling and flange hub. Those parts are fitted and glued using 4 M6
screws, then tightened to a torque of 10Nm.
–Measure and adjust the distance between the coupling face (13)
and the motor flange (480). This value must be 217 mm. Lock
with the fixing screw (14).
–Fit the protection grid (431) into the motor lantern.
–Mount the motor lantern (430) onto the motor (480). Tighten with
the screw (436).
Step 4
–Carefully fit the motor/ lantern/ exterior rotor unit onto the pump.
The two guiding rods will compensate the radial forces coming
from the magnets. Make sure to keep good control over the axial
forces ! (Risk of squashed fingers!)
–Tighten the screws (432).
Dismantling the motor/ the
lanterne/ the exterior coupling
CAUTION
Always make sure that the vacuum pump is disconnected from the
power supply when carrying out any work on the pump.
If necessary, remove the vacuum pump from the system to carry out
any work.
DANGER
Danger of personal injury whilst dismantling/assembling the com-
ponents.
When dismantling the Roots pump (replacing internal components),
separate the motor/ lantern unit from the pump body.
The motor, the lantern and the exterior coupling must not be separa-
ted during dismantling.
To do this, follow the following instructions:
–Unscrew the bolts pins from the motor/lantern unit
–Remove the motor/lantern unit with the help of the guiding
rods.The access to the internal components is now given.
Dismantling the motor/ the lanterne/ the exterior coupling COBRA Vacuum Pump with Magnetic Coupling
Page 6 0870549497 (EN)
7 / 8
11
10
12
9
15
480
14
13
430
431
436
432

CAUTION
Do not damage the magnetic coupling and any of the other com-
ponents which do not need to be changed.
CAUTION
All maintenance work on or around the magnetic coupling must be
carried out under strict adherence to safety standards.
The same applies to all dismantling work on other parts of the
vacuum pump.
Fitting the motor/ the
lanterne/ the exterior coupling
When fitting the motor/lantern unit onto the pump, carefully fit the
components with the help of the two guiding rods. These help to com-
pensate radial forces.
CAUTION : While mounting this unit, control the axial force. Risk of
squashing fingers due to the effect of magnetism.
Inactivity of the vacuum pump for
longer periods of time
If the pump is to be switched off for a long period of time, precautio-
nary measures of protection against corrosion must be carried out.
CAUTION
Label rooms where pumps equipped with magnetic couplings are
stored with the danger sign:“Notrespassing for persons with pa-
cemaker ” !
COBRA Vacuum Pump with Magnetic Coupling Fitting the motor/ the lanterne/ the exterior coupling
0870549497 (EN) Page 7

Note

EC-Declaration of Conformity
NOTE: This EC Declaration of Conformity and the -marking on the nameplate are valid for the vacuum pump within the Busch scope of delivery.
When this vacuum pump is integrated into a larger machinery or system, the manufacturer of the larger machinery or system (this can also be the
end user) must conduct the conformity assessment procedure in accordance with the Machinery Directive 2006/42/EC for the larger machine or sys-
tem, issue the Declaration of Conformity for it and affix the corresponding marking.
We
Ateliers Busch S.A.
Zone Industrielle
2906 Chevenez
Switzerland
represented in the European Union by
Dr.-Ing. K. Busch GmbH
Schauinslandstr. 1
79689 Maulburg
Germany
hereby declare that the vacuum pumps NC 400 B
in accordance with the European Directives
“Machinery” 2006/42/EC,
“Electrical Equipment Designed for Use within Certain Voltage Limits” (so called “Low Voltage”) 2006/95/EC,
“Electromagnetic Compatibility” 2004/108/EC
have been designed and manufactured to the following specifications:
Standard Title of the Standard
Harmonised Standards
EN ISO 12100-1
EN ISO 12100-2
Safety of machinery - Basic concepts, general principles of design - Part 1 and 2
EN ISO 13857 Safety of machinery - Safety distances to prevent hazard zones being reached by upper and lower limbs
EN 1012-1
EN 1012-2
Compressors and vacuum pumps - Safety requirements - Part 1 and 2
EN 60204-1 Safety of machinery - Electrical equipment of machines - Part 1: General requirements
EN 61000-6-1
EN 61000-6-2
Electromagnetic compatibility (EMC) - Generic immunity standards; part 1 and 2
EN 61000-6-3
EN 61000-6-4
Electromagnetic compatibility (EMC) - Generic emission standards; part 1 and 2
National Standard
EN ISO 2151 Acoustics - Noise test code for compressors and vacuum pumps - Engineering method (grade 2)
Manufacturer Representative in the EU
Werner Kervarec
General Director
Dr.-Ing. Karl Busch
General Director

Note