BUSCH Mink MM 1202 AV User manual

Installation and
Operating Instructions
Vacuum Pumps
MINK MM 1324, 1202, 1252, 1322 AV
ATEX-Version
Busch Produktions GmbH
Schauinslandstr. 1
79689 Maulburg
Germany
0870145304 /190709 / Original instructions / Modifications reserved

MM 1324, 1202, 1252, 1322 AV ATEX-Version
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Table of Contents
Preface...........................................................................................2
Product Description ......................................................................3
Use.............................................................................................3
Safety Concept...........................................................................4
Operational Options / Use of Optionally Available Equipment.....4
Operation with Vacuum Relief Valve / Ambient Air Valve.......4
Principle of Operation.................................................................5
Cooling.......................................................................................5
Start Controls..............................................................................5
Safety .............................................................................................5
Intended Use..............................................................................5
Safety Notes...............................................................................5
Noise Emission...........................................................................5
Transport .......................................................................................6
Transport in Packaging...............................................................6
Transport without Packaging.......................................................6
Storage...........................................................................................6
Short-term Storage.....................................................................6
Conservation ..............................................................................6
Installation and Commissioning...................................................6
Installation prerequisites.............................................................6
Mounting Position and Space.................................................6
Suction Connection................................................................7
Gas Discharge.......................................................................7
Electrical Connection / Controls.............................................8
Installation..................................................................................8
Mounting................................................................................8
Checking Synchronising Gear Oil ..........................................8
Connecting Electrically...........................................................8
Connecting Lines/Pipes.........................................................9
Checking the Function of the Measurement and Safety
Instrumentation....................................................................10
Recording of Operational Parameters..................................10
Operating Notes .......................................................................10
Use......................................................................................10
Conveying Condensable Vapours........................................12
Maintenance.................................................................................12
Maintenance Schedule.............................................................12
Monthly.............................................................................12
Every 3 Months:................................................................13
Every 6 Months:................................................................13
Every Year:.......................................................................13
Every 20000 Operating Hours, At the Latest after 6 Years:13
Checking the Function of the Measurement and Safety
Instrumentation....................................................................13
Overhaul.......................................................................................14
Removal from Service.................................................................14
Temporary Removal from Service.............................................14
Recommissioning.....................................................................14
Dismantling and Disposal .........................................................14
Troubleshooting..........................................................................15
Spare Parts ..................................................................................18
Equipment Documentation Measurement and Safety
Instrumentation ...........................................................................19
Overview ..................................................................................19
Version with Resistance Thermometer, without Transmitter.19
Version with Resistance Thermometer and Transmitter.......19
Documentation Resistance Thermometer .................................20
Documentation Temperature Transmitter..................................42
EU-Declaration of Conformity .....................................................52
Technichal Data...........................................................................53
Version with standard motor (cat. 2 or cat. 3 inside the
vacuum pump, no Ex-zone in the environment of the vacuum
pump)..................................................................................53
Version with Ex-motor..........................................................53
Busch - All over the World in Industry.......................................56
Preface
Congratulations on your purchase of the Busch vacuum pump. With
watchful observation of the field’s requirements, innovation and
steady development Busch delivers modern vacuum and pressure
solutions worldwide.
These operating instructions contain information for
−product description,
−safety,
−transport,
−storage,
−installation and commissioning,
−maintenance,
−overhaul,
−troubleshooting and
−spare parts
of the vacuum pump.
Version with ATEX-drive motor:
The ATEX-drive motor is subject to a separate instruction
manual.
For the purpose of these instructions, “handling” the vacuum pump
means the transport, storage, installation, commissioning, influence
on operating conditions, maintenance, troubleshooting and overhaul
of the vacuum pump.
Prior to handling the vacuum pump these operating
instructions shall be read and understood. If anything remains
to be clarified please contact your Busch representative!
Keep these operating instructions and, if applicable, other
pertinent operating instructions available on site.

MM 1324, 1202, 1252, 1322 AV ATEX-Version
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Product Description
Use
The vacuum pump is intended for
−the suction
of
−mixtures of dry, non-aggressive and non-toxic gases and/or
dust according to the identification on the nameplate of the
vacuum pump (explanation see below).
Conveying media with a lower or higher density than air leads to an
increased thermal and/or mechanical load on the vacuum pump and
is permissible only after prior consultation with Busch.
Max. allowed temperature of the inlet gas: 40 °C
According to the directive 2014/34/EU(“ATEX 2014”) the
vacuum pump is made for the intended use in potentially
explosive areas according to the data given on the nameplate
of the vacuum pump and on the data given on the nameplate of
the drive motor.
This requires a separate consideration of the conveyed gas/air or
dust/air mixtures on the one side and the environment of the vacuum
pump on the other. On the nameplate of the vacuum pump the
classification with regard to the conveyed gas/air or dust/air mixtures
is marked with an “inside”, while the classification with regard to the
environment is marked with an “outside”. The classification of the
motor always refers to the environment.
In case Busch delivered the vacuum pump/ compressor without
drive motor or a replacement motor is to be mounted or for
economic reasons the vacuum pump was equipped with a simpler
motor, the following must be observed:
In case the classifications of the vacuum pump and of the drive
motor are different the inferior classification is relevant. This
means also that the vacuum pump is suitable for the placement
in a potentially explosive environment only if both the vacuum
pump, the coupling and the drive motor are approved to the
required extent for use in potentially explosive areas.
Depending on the version the approval is valid only together
with certain standard or optional components, or is limited by
the use of certain optional components, as described below
and in the chapter Operational Options / Use of Optionally
Available Equipment (➔ page 4).
The classification on the vacuum pump is to be read as follows
(interpretations of equipment categories and zones for information
only; the relevant laws, directives and standards are literally binding;
for temperature classes and explosion groups see E. Brandes,
W. Möller “Sicherheitstechnische Kenngrößen, Band 1: Brennbare
Flüssigkeiten und Gase”, ISBN 3–89701–745–8 (or equivalent
source)):
= Execution according to directive 2014/34/EU
inside = in this line classification for explosive atmosphere
inside the vacuum pump
II 2G IIB3 TX = in the process gas explosive atmosphere
consisting of a mixture with air of flammable substances in the form
of gas likely to occur in normal operation occasionally;
if the process gas contains dust, also if the dust is not combustible,
the use of a special ATEX-inlet air filter (with equipotential bonding)
is required; temperature monitoring is required (resistance
a Nameplate, vacuum pump
b Connection for equipotential bonding,
inlet filter
c Terminal box, drive motor
d Directional arrows
e Oil sight glass
f Inspection port, cooling air duct
g Terminal box, temperature
measurement system
h Vacuum relief valve with air filter
(optional)
i Eye bolt
j Equipotential bonding rail
k Vacuum gauge, suction pressure
l Nameplate drive motor
m Suction connection
n Inlet air filter (depending on version)
o Cooling air inlet
p Position of condensate drain cock
(optional for version “Aqua“)
q Gas discharge
r Cooling air outlet
s Acoustic enclosure
t Cylinder
u Rotors
v Non-return valve

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thermometer and temperature-transmitter in standard scope of
delivery);
II 3G IIB3 TX = in the process gas explosive atmosphere consisting
of a mixture with air of flammable substances in the form of gas not
likely to occur in normal operation but, if it does occur, will persist for
a short period only;
if the process gas contains dust, also if the dust is not combustible,
the use of a special ATEX-inlet air filter (with equipotential bonding)
is required; temperature monitoring is required (resistance
thermometer and temperature-transmitter in standard scope of
delivery);
II 3D TX °C = in the process gas explosive atmosphere in the
form of a cloud of combustible dust in air not likely to occur in normal
operation but, if it does occur, will persist for a short period only;
the use of the special ATEX-inlet air filter (with equipotential
bonding) is required;
outside = in this line classification for explosive atmosphere in
the environment of the vacuum pump
II 2G IIB3 TX = in the environment explosive atmosphere
consisting of a mixture with air of flammable substances in the form
of gas, vapour or mist likely to occur in normal operation
occasionally; temperature monitoring is required (resistance
thermometer and temperature-transmitter in standard scope of
delivery); sufficiently qualified ATEX-drive motor is required;
II 3G IIB3 TX °C = in the environment explosive atmosphere
consisting of a mixture with air of flammable substances in the form
of gas, vapour or mist not likely to occur in normal operation but, if it
does occur, will persist for a short period only; temperature
monitoring is required (resistance thermometer and temperature-
transmitter in standard scope of delivery); sufficiently qualified
ATEX-drive motor is required
II 2D TX °C = in the environment explosive atmosphere in the
form of a cloud of combustible dust in air likely to occur in normal
operation occasionally; temperature monitoring is required
(resistance thermometer and temperature-transmitter in standard
scope of delivery); sufficiently qualified ATEX-drive motor is
required;
II 3D TX °C = in the environment explosive atmosphere in the form
of a cloud of combustible dust in air not likely to occur in normal
operation but, if it does occur, will persist for a short period only;
temperature monitoring is required (resistance thermometer and
temperature-transmitter in standard scope of delivery); sufficiently
qualified ATEX-drive motor is required
Standard-version:
The gas shall be free from vapours that would condensate under
the temperature and pressure conditions inside the vacuum
pump.
Version “Aqua”:
The vacuum pump features the corrosion protection coating
CPC and is capable of conveying water vapour (➔ page 12:
Conveying Condensable Vapours). Conveyance of other
vapours shall be agreed upon with Busch. Conveyance of water
or other liquids in liquid phase increases the power consumption
and shall therefore be avoided (risk of drive overload).
The vacuum pump is thermally suitable for continuous operation
(100 percent duty).
Max. permissible number of startings per hour: 12
The vacuum pump is not ultimate pressure proof. Operation with a
closed (“blanked”) suction line will damage the vacuum pump.
The minimum allowed intake pressure is to be read from the
nameplate of the vacuum pump. By means of process control it must
be made sure that the minimum allowed intake pressure will not be
underrun. Under very restricted conditions (➔ page 4: Operation
with Vacuum Relief Valve / Ambient Air Valve) the use of a vacuum
relief valve (optional) with inlet air filter and equipotential bonding (if
required) is permitted.
The vacuum pump is not gas tight. In new conditions a volume flow
of < 0.25 m³/h passes from the environment into the vacuum pump
passing the shaft sealing. This must be taken into account
particularly in case of inerted explosive conveyed media. In case of
doubt seek advice from your Busch representative.
The vacuum pump is not gas tight. Make sure that the installation
space or location is vented such that in case of conveying media
which are dangerous to health no impermissible accumulation of
conveyed media in the environment of the vacuum pump will occur.
The installation space or location must be vented sufficiently.
The approval for use in potentially explosive atmospheres is
valid for the vacuum pump together with the described
measurement and safety equipment. The approval is void if the
system is altered or if the scheduled maintenance is not
complied with. Maintenance must be performed by specifically
instructed personnel only.
Safety Concept
Version with temperature monitoring:
The safety concept is based on the prevention of excessive
temperatures by means of a gas temperature sensor in the
vicinity of the stage gas outlet (=zone of highest temperature)
together with various other measures to prevent sparks. The
temperature sensor must be integrated into the system control
such that operation of the vacuum pump will safely be inhibited if
the shutdown temperature (see nameplate) is exceeded.
Operational Options / Use of
Optionally Available Equipment
Operation with varying speed, i.e. with a frequency inverter is
permitted, provided that the drive motor is approved for frequency
inverter operation and the allowed speed range is given on the
nameplate of the vacuum pump.
The system control must be designed such that no speed outside
the permissible range can be set.
Operation with Vacuum Relief Valve /
Ambient Air Valve
Vacuum pumps type MM 1324 AV the pressure of which according
to the nameplate is 60 hPa (mbar) are ultimate pressure proof, i.e.
may be operated against a closed suction connection. For all other
vacuum pumps operation without gas transfer would lead to
excessive temperatures and is hence not permitted.
In case the pressure control in the suction side of the system cannot
be achieved by means of process control or by controlling the drive
motor, the pressure needs to be controlled by means of a vacuum
relief valve (optional).
For the version “Aqua” it can be necessary to dry the vacuum pump
after process end by means of conveying ambient air (➔ page 12:
Conveying Condensable Vapours).
However, if vacuum relief valves/ ambient air valves are used the
following must be observed:

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Apart from this:
Aspiration of ambient air from a zone 1 or a zone 2 (potentially
explosive gas atmospheres) is permitted only if the vacuum pump is
approved for the conveyance of these gases. It is recommended to
install an ATEX-air filter (with equipotential bonding) upstream the
vacuum relief valve/ ambient air valve.
Aspiration of ambient air from a zone 21 or a zone 22 (potentially
explosive dust/air atmospheres) is permitted only if an ATEX-air filter
(with equipotential bonding) is installed upstream the vacuum relief
valve/ ambient air valve.
Aspiration of ambient air from areas not classified as potentially
explosive is permitted. It is recommended to install an air filter
upstream the vacuum relief valve/ ambient air valve.
Principle of Operation
The vacuum pump works on the claw principle.
The components are dimensioned such, that on the one hand there
is never contact between the two claws or between a claw and the
cylinder, on the other hand the gaps are small enough to keep the
clearance loss between the chambers low.
In order to avoid the suction of solids, the vacuum pump is equipped
with a screen in the suction connection.
In order to avoid reverse rotation after switching off, the vacuum
pump is equipped with a non-return valve (v).
The vacuum pump compresses the inlet gas absolutely oil-free. A
lubrication of the pump chamber is neither necessary nor allowed.
Cooling
The vacuum pump is cooled by
−radiation of heat from the surface of the vacuum pump
−the air flow from the fan wheel of the drive motor
−the process gas
−the air flow from the fan wheel on the shaft of the vacuum
pump
Start Controls
The vacuum pump comes without start controls. The control of the
vacuum pump is to be provided in the course of installation.
Safety
Intended Use
Definition: For the purpose of these instructions, “handling” the
vacuum pump means the transport, storage, installation,
commissioning, influence on operating conditions, maintenance,
troubleshooting and overhaul of the vacuum.
The vacuum pump is intended for industrial use. It shall be handled
only by qualified personnel.
The allowed media and operational limits (➔➔➔➔
page 3: Product
Description) and the installation prerequisites (➔➔➔➔
page 6:
Installation Prerequisites) of the vacuum pump shall be
observed both by the manufacturer of the machinery into which
the vacuum pump is to be incorporated and by the operator.
The maintenance instructions shall be observed.
In particular the intended use in potentially explosive areas, i.e.
either inside the vacuum pump or in its adjacency potentially
explosive atmosphere can occur, requires that the vacuum pump is
equipped accordingly and carries the Ex-mark and that the
associated documentation acc. to the directive 2014/34/EUis
available.
Prior to handling the vacuum pump these installation and
operating instructions shall be read and understood. If
anything remains to be clarified please contact your Busch
representative!
Safety Notes
The vacuum pump has been designed and manufactured according
to state-of-the-art methods. Nevertheless, residual risks may
remain. These operating instructions highlight potential hazards
where appropriate. Safety notes are tagged with one of the
keywords DANGER, WARNING and CAUTION as follows:
Noise Emission
For the sound pressure level in free field according to EN ISO 2151
➔page 53: Technical Data.
WARNING
By means of the vacuum relief valve/ ambient air valve the
process gas gets usually mixed with ambient air, with the
mixing ratio depending on the current working pressure of
the vacuum pump.
For certain process gases the mixing with air increases the
explosion risk because of the oxygen contained herein.
So the vacuum relief valve/ ambient air valve must be
considered when the zone inside the vacuum pump is
being established.
If the mixing of process gas and ambient air created an
illegal zone inside the vacuum pump, feeding of ambient air
would not be allowed. In this case an inert dry gas must be
fed.
DANGER
Disregard of this safety note will always lead to accidents
with fatal or serious injuries.
WARNING
Disregard of this safety note may lead to accidents with
fatal or serious injuries.
CAUTION
Disregard of this safety note may lead to accidents with minor
injuries or property damage.
CAUTION
The vacuum pump emits noise of high intensity in a narrow
band.
Risk of damage to the hearing.
Persons staying in the vicinity of a non noise insulated vacuum
pump over extended periods shall wear ear protection.

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Transport
Transport in Packaging
Packed on a pallet the vacuum pump is to be transported with a
forklift.
Transport without Packaging
In case the vacuum pump is packed in a cardboard box with inflated
cushions:
♦Remove the inflated cushions from the box
In case the vacuum pump is packed in a cardboard box cushioned
with rolled corrugated cardboard:
♦Remove the corrugated cardboard from the box
In case the vacuum pump is laid in foam:
♦Remove the foam
In case the vacuum pump is bolted to a pallet or a base plate:
♦Remove the bolting between the vacuum pump and the
pallet/base plate
In case the vacuum pump is fastened to the pallet by means of
tightening straps:
♦Remove the tightening straps
•Make sure that the eyebolts are in faultless condition (replace
damaged, e.g. bent eyebolts with a new ones)
•Make sure that the eyebolts are fully screwed in and tightened
by hand
•Attach lifting gear securely to the eyebolts on the synchronising
gear (i) and on the drive motor
In case the drive motor comes without an eyebolt or the eyebolt on
the drive motor is located at an unfavourable position:
♦Loop a belt/rope with suitable length and strength around
the flange of the drive motor
•Attach the lifting gear to a crane hook with safety latch
•Lift the vacuum pump with a crane
In case the vacuum pump was bolted to a pallet or a base plate:
♦Remove the stud bolts from the rubber feet
Storage
Short-term Storage
•Make sure that the suction connection and the gas discharge
are closed (leave the provided plugs in)
•Store the vacuum pump
−If possible in original packaging,
−indoors,
−dry,
−dust free and
−vibration free.
Conservation
In case of adverse ambient conditions (e.g. aggressive atmosphere,
frequent temperature changes) conserve the vacuum pump
immediately. In case of favourable ambient conditions conserve the
vacuum pump if a storage of more than 3 months is scheduled.
•Make sure that all ports are firmly closed; seal all ports that are
not sealed with PTFE-tape, gaskets or o-rings with adhesive
tape
Note: VCI stands for “volatile corrosion inhibitor”. VCI-products (film,
paper, cardboard, foam) evaporate a substance that condenses in
molecular thickness on the packed good and by its electro-chemical
properties effectively suppresses corrosion on metallic surfaces.
However, VCI-products may attack the surfaces of plastics and
elastomers. Seek advice from your local packaging dealer! Busch
uses CORTEC VCI 126 R film for the overseas packaging of large
equipment.
•Wrap the vacuum pump in VCI film
•Store the vacuum pump
−If possible in original packaging,
−indoors,
−dry,
−dust free and
−vibration free.
For commissioning after conservation:
•Make sure that all remains of adhesive tape are removed from
the ports
•Commission the vacuum pump as described in the chapter
Installation and Commissioning (➔ page 6)
Installation and
Commissioning
Installation prerequisites
•Make sure that the integration of the vacuum pump is carried
out such that the essential safety requirements of the Machine
Directive 2006/42/EC are complied with (in the responsibility of
the designer of the machinery into which the vacuum pump is
to be incorporated; ➔ page 52: note in the EU-Declaration of
Conformity)
Mounting Position and Space
•Make sure that the following ambient conditions will be
complied with:
−dry and free from corrosion-promoting gases, vapours, mists
and dusts
−ambient temperature: 0 … 40 °C
−ambient pressure: atmospheric
CAUTION
In case of non-compliance with the installation prerequisites,
particularly in case of insufficient cooling:
Risk of damage or destruction of the vacuum pump and
adjoining plant components!
Risk of injury!
The installation prerequisites must be complied with.
CAUTION
Do not walk, stand or work under suspended loads.

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−altitude of location: up to 1000 m above sea level
•Make sure that the environmental conditions comply with the
protection class of the drive motor (according to the nameplate)
•Make sure that the vacuum pump can neither inadvertently nor
intentionally be stepped on and cannot be used as a support
for heavy objects
•Make sure that the vacuum pump cannot be hit by falling
objects
•Make sure that the vacuum pump will be placed or mounted
horizontally
•Make sure that the base for placement / mounting base is even
•Make sure that in order to warrant a sufficient cooling there will
be a clearance of minimum 1 m between the vacuum pump
and nearby walls
•Make sure that no heat sensitive parts (plastics, wood,
cardboard, paper, electronics) will touch the surface of the
vacuum pump
•Make sure that the installation space or location is vented such
that a sufficient cooling of the vacuum pump is warranted
•Make sure that the vacuum pump will not be touched
inadvertently during operation, provide a guard if appropriate
•Make sure that the sight glass (e) of the synchronising gear will
remain accessible
Suction Connection
In case the inlet gas can contain dust or other foreign solid particles:
♦Make sure that a suitable filter (5 micron or less) is
installed upstream the vacuum pump (included in scope of
delivery)
♦Make sure that the filter is sufficiently ATEX-qualified
(electrically conductive, with equipotential bonding etc.;
also for non-combustible dusts!)
•Make sure that the suction line fits to the suction connection
(m) of the vacuum pump
Version for the conveyance of explosive atmospheres consisting of a
mixture with air of flammable substances in the form of gas:
♦Make sure that the pipe is made from electrically
conductive material and equipped with an equipotential
bonding connection (execution according to EN 60079-14
or equivalent national or local regulations)
Version for the conveyance of explosive atmospheres in the form of
a cloud of combustible dust in air:
♦Make sure that the pipe is made from electrically
conductive material and equipped with an equipotential
bonding connection (execution according to EN 61241-14
or equivalent national or local regulations)
•Make sure that the pipe will cause no stress on the vacuum
pump’s connection, if necessary use an expansion joint
•Make sure that the line size of the suction line over the entire
length is at least as large as the suction connection (m) of the
vacuum pump
In case the length of the suction line exceeds 2 m it is prudent to use
larger line sizes in order to avoid a loss of efficiency and an overload
of the vacuum pump. Seek advice from your Busch representative!
In case the vacuum pump shall be maintained after shutdown of the
vacuum pump:
♦Provide a manual or automatic operated valve (= non-
return valve) in the suction line
Version “Aqua”, if very humid process gases and/or adverse
operating cycles bear the risk, that condensates remain in the
vacuum pump:
♦Provide a shut-off valve, a drip-leg and a drain cock in the
suction line, so that condensates can be drained from the
suction line
♦Provide a valve for the unthrottled suction of ambient air
(ambient air valve) between the shut-off valve and the
vacuum pump (in order to dry the vacuum pump after
process end). For non ultimate-pressure-proof vacuum
pumps provide a vacuum relief valve (suitable for
continuous operation) for the throttled aspiration of
ambient air during warming up.
Observe the limitations with regard to the aspiration
of ambient air (➔ page 4: Operation with Vacuum
Relief Valve / Ambient Air Valve)
♦Make sure that the anti-pulsation chamber is equipped
with a condensate drain cock (p) (optional); (if the
condensate drain cock is missing contact the Busch
service)
•Make sure that the suction line does not contain foreign
objects, e.g. welding scales
Gas Discharge
The discharged gas must flow without obstruction. It is not
permitted to shut off or throttle the discharge line or to use it as
a pressurised air source.
•Make sure that the discharge line fits to the gas discharge (q)
of the vacuum pump
Version for the conveyance of explosive atmospheres consisting of a
mixture with air of flammable substances in the form of gas:
♦Make sure that the pipe is made from electrically
conductive material and equipped with an equipotential
bonding connection (execution according to EN 60079-14
or equivalent national or local regulations)
•Make sure that the pipe will cause no stress on the vacuum
pump’s connection, if necessary use an expansion joint
•Make sure that the line size of the discharge line over the entire
length is at least 2 “
In case the length of the discharge line exceeds 2 m it is prudent to
use larger line sizes in order to avoid a loss of efficiency and an
overload of the vacuum pump. Seek advice from your Busch
representative!
WARNING
In case the vacuum pump is intended to convey potentially
explosive gases/gas mixtures (➔ page 3: Product
Description):
Risk of explosion in the discharge area!
The process gas/gas mixture must be disposed of such
that no potentially explosive gas mixtures can accumulate
in the discharge area.
CAUTION
Intruding foreign objects or liquids can destroy the vacuum
pump.
CAUTION
During operation the surface of the vacuum pump may reach
temperatures of more than 70 °C.
Risk of burns!

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•Make sure that the discharge line either slopes away from the
vacuum pump or provide a liquid separator or a drip leg with a
drain cock, so that no liquids can back up into the vacuum
pump
Electrical Connection / Controls
Version with ATEX-drive motor:
♦Make sure that installation instructions for the ATEX-drive
motor (separate leaflet) are available
♦Observe the instructions given in the installation
instructions manual for the ATEX-drive motor
•Make sure that the stipulations acc. to the EMC-Directive
2004/108/EC and Low-Voltage-Directive 2006/95/EC as well as
the EN-standards, electrical and occupational safety directives
and the local or national regulations, respectively, are complied
with (this is the responsibility of the designer of the machinery
into which the vacuum pump is to be incorporated; ➔ page 52:
note in the EU-Declaration of Conformity).
•Make sure that the power supply for the drive motor is
compatible with the data on the nameplate of the drive motor
•Make sure that an overload protection according to EN 60204-1
is provided for the drive motor
•Make sure that the drive of the vacuum pump will not be
affected by electric or electromagnetic disturbance from the
mains; if necessary seek advice from the Busch service
In case of mobile installation:
♦Provide the electrical connection with grommets that serve
as strain-relief
Version with temperature monitoring:
♦Execute the interfaces for the temperature measurement
system in the system control according to the instructions
of the manufacturer (➔ page 19: Equipment
Documentation Measurement and Safety Instrumentation);
applicable shutdown temperature ➔ nameplate of the
vacuum pump
•Make sure that an earth point is available for connection to the
equipotential bonding rail or the ATEX-inlet air filter resp.
Electrical circuits in zone 1 (outside) shall be executed intrinsically
safe in protection class ib acc. to EN 60079-11.
All signal lines shall be executed with shielded cables according to
EN 60079-14 or EN 61241-14 or the equivalent national or local
regulations.
Installation
Mounting
•Make sure that the installation prerequisites (➔ page 6) are
complied with
•Set down or mount the vacuum pump at its location
Checking Synchronising Gear Oil
The vacuum pump is delivered with oil filled synchronising gear.
The level shall be slightly above the middle of the sight glass (e).
•Check on the sight glass (e) that the proper amount of oil is
filled
Connecting Electrically
Version with ATEX-drive motor:
♦Connect the drive motor according to the installation
instructions for the drive motor (separate leaflet)
Version with non-ATEX-drive motor:
♦Connect the drive motor according to the installation
instructions given below
•Electrically connect the drive motor
•Connect the protective earth conductor
Delta connection (low voltage):
Star connection (high voltage):
CAUTION
The connection schemes given below are typical. Depending on
the specific order or for certain markets deviating connection
schemes may apply.
Risk of damage to the drive motor!
The inside of the terminal box shall be checked for drive motor
connection instructions/schemes.
WARNING
Risk of electrical shock, risk of damage to equipment.
Electrical installation work must only be executed by
qualified personnel that knows and observes the following
regulations:
- IEC 364 or CENELEC HD 384 or DIN VDE 0100, respectively,
- IEC-Report 664 or DIN VDE 0110,
- BGV A2 (VBG 4) or corresponding national accident
prevention regulation.

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page 9
Double star connection, multi-voltage motor with 9 terminals (low
voltage):
Star connection, multi-voltage motor with 9 terminals (high voltage):
Double star connection, multi-voltage motor with 12 terminals (low
voltage):
Delta connection, multi-voltage motor with 12 terminals (middle
voltage):
Star connection, multi-voltage motor with 12 terminals (high voltage):
•Determine the intended direction of rotation with the arrow (d)
(stuck on or cast)
•“Bump” the drive motor
•Watch the fan wheel of the drive motor and determine the
direction of rotation just before the fan wheel stops
If the rotation must be changed:
♦Switch any two of the drive motor wires
Version with temperature monitoring:
♦Connect the temperature measurement system (part of
standard scope of delivery) to the system control
Version with equipotential bonding rail:
♦Connect the equipotential bonding rail to the earth point
with an earth cable
Version with ATEX-inlet air filter, without equipotential bonding rail:
♦Connect the housing of the inlet air filter to the earth point
with an earth cable
Connecting Lines/Pipes
•Connect the suction line
•Connect the discharge line
Installation without discharge line:
♦Make sure that the gas discharge (q) is open
Version with equipotential bonding rail:
♦Connect the equipotential bonding connectors of the pipes
to the equipotential bonding rail
Version with ATEX-inlet air filter, without equipotential bonding rail:
♦Connect the equipotential bonding connector of the
suction line to the earth point
•Make sure that all provided covers, guards, hoods etc. are
mounted
•Make sure that the cooling air inlets and outlets are not covered
or obstructed and that the cooling air flow is not affected
adversely in any other way
WARNING
The proper integration of measurement and safety
equipment into the system control is decisive for the
explosion safety of the vacuum pump.
Risk of explosion!
The vacuum pump may be operated in areas with
potentially explosive atmosphere only with completely
installed and checked measurement and safety equipment.
CAUTION
Operation in the wrong direction of rotation can destroy the
vacuum pump in short time.
Risk of explosion!
Prior to starting-up it must be made sure that the vacuum pump
is operated in the proper direction (clockwise rotating field).

MM 1324, 1202, 1252, 1322 AV ATEX-Version
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Checking the Function of the
Measurement and Safety Instrumentation
(version with temperature monitoring only)
•Make sure that the vacuum pump aspirates inert gases and
that there are no potentially explosive atmospheres in the
environment
•Open the lid of the temperature measurement system (g)
•Disconnect the white cable from pin 3, the first red cable from
pin 5 and the second red cable from pin 6
•In order to simulate the resistance thermometer Pt100 set a
variable ohmic resistance to approx. 100 Ω
•Connect the variable ohmic resistance with 3 identical cables
to the pins 3, 5 and 6 of the temperature transmitter as shown
in the sketch (the cable connected to pin 5 compensates the
cable resistance)
•Switch on the vacuum pump
•Increase the ohmic resistance to the resistance at shutdown
temperature according to the Equipment Documentation
Measurement and Safety Instrumentation (➔ page 19)
•Make sure that an alarm is released in the system control and
the vacuum pump is shut down automatically
•Decrease the ohmic resistance to a value less than the
shutdown point
•Make sure that the alarm persists
•Make sure that the vacuum pump does not start self-acting
•Switch on the vacuum pump again
•Interrupt the ohmic resistance
•Make sure that a fault indication is released in the system
control and the vacuum pump is shut down automatically
•Reconnect the variable ohmic resistance
•Switch on the vacuum pump again
•Short circuit the variable ohmic resistance
•Make sure that a fault indication is released in the system
control and the vacuum pump is shut down automatically
•Remove the short circuit
•Remove the variable ohmic resistance
•Reconnect the resistance thermometer Pt100 to the
temperature transmitter (white cable to pin 3, first red cable to
pin 5, second red cable to pin 6, ➔ sketch)
•Firmly close the temperature measurement system (g) with the
lid
Recording of Operational Parameters
As soon as the vacuum pump is operated under normal operating
conditions:
•Measure the drive motor current and record it as reference for
future maintenance and troubleshooting work
Operating Notes
Use
The vacuum pump is intended for
−the suction
of
−mixtures of dry, non-aggressive and non-toxic gases and/or
dust according to the identification on the nameplate of the
vacuum pump (explanation see below).
Conveying media with a lower or higher density than air leads to an
increased thermal and/or mechanical load on the vacuum pump and
is permissible only after prior consultation with Busch.
Max. allowed temperature of the inlet gas: 40 °C
According to the directive 2014/34/EU(“ATEX 2014”) the
vacuum pump is made for the intended use in potentially
explosive areas according to the data given on the nameplate
of the vacuum pump and on the data given on the nameplate of
the drive motor.
This requires a separate consideration of the conveyed gas/air or
dust/air mixtures on the one side and the environment of the vacuum
pump on the other. On the nameplate of the vacuum pump the
classification with regard to the conveyed gas/air or dust/air mixtures
WARNING
Risk of electrical shock, risk of damage to equipment.
Electrical installation work must only be executed by
qualified personnel that knows and observes the following
regulations:
- IEC 364 or CENELEC HD 384 or DIN VDE 0100,
respectively,
- IEC-Report 664 or DIN VDE 0110,
- BGV A2 (VBG 4) or corresponding national accident
prevention regulation.
WARNING
Operating a faulty vacuum pump puts the explosion safety
at risk.
Risk of explosion!
The vacuum pump must only be operated in faultless
condition. A faulty vacuum pump must immediately be
removed from service.
WARNING
The vacuum pump is designed for operation under the
conditions described below.
In case of disregard risk of explosion!
The vacuum pump must only be operated under the
conditions described below.

MM 1324, 1202, 1252, 1322 AV ATEX-Version
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is marked with an “inside”, while the classification with regard to the
environment is marked with an “outside”. The classification of the
motor always refers to the environment.
In case Busch delivered the vacuum pump/ compressor without
drive motor or a replacement motor is to be mounted or for
economic reasons the vacuum pump was equipped with a simpler
motor, the following must be observed:
In case the classifications of the vacuum pump and of the drive
motor are different the inferior classification is relevant. This
means also that the vacuum pump is suitable for the placement
in a potentially explosive environment only if both the vacuum
pump, the coupling and the drive motor are approved to the
required extent for use in potentially explosive areas.
Depending on the version the approval is valid only together
with certain standard or optional components, or is limited by
the use of certain optional components, as described below
and in the chapter Operational Options / Use of Optionally
Available Equipment (➔ page 4).
The classification on the vacuum pump is to be read as follows
(interpretations of equipment categories and zones for information
only; the relevant laws, directives and standards are literally binding;
for temperature classes and explosion groups see E. Brandes,
W. Möller “Sicherheitstechnische Kenngrößen, Band 1: Brennbare
Flüssigkeiten und Gase”, ISBN 3–89701–745–8 (or equivalent
source)):
= Execution according to directive 2014/34/EU
inside = in this line classification for explosive atmosphere
inside the vacuum pump
II 2G IIB3 TX = in the process gas explosive atmosphere
consisting of a mixture with air of flammable substances in the form
of gas likely to occur in normal operation occasionally;
if the process gas contains dust, also if the dust is not combustible,
the use of a special ATEX-inlet air filter (with equipotential bonding)
is required; temperature monitoring is required (resistance
thermometer and temperature-transmitter in standard scope of
delivery);
II 3G IIB3 TX = in the process gas explosive atmosphere consisting
of a mixture with air of flammable substances in the form of gas not
likely to occur in normal operation but, if it does occur, will persist for
a short period only;
if the process gas contains dust, also if the dust is not combustible,
the use of a special ATEX-inlet air filter (with equipotential bonding)
is required; temperature monitoring is required (resistance
thermometer and temperature-transmitter in standard scope of
delivery);
II 3D TX °C= in the process gas explosive atmosphere in the
form of a cloud of combustible dust in air not likely to occur in normal
operation but, if it does occur, will persist for a short period only;
the use of the special ATEX-inlet air filter (with equipotential
bonding) is required;
outside = in this line classification for explosive atmosphere in
the environment of the vacuum pump
II 2G IIB3 TX = in the environment explosive atmosphere
consisting of a mixture with air of flammable substances in the form
of gas, vapour or mist likely to occur in normal operation
occasionally; temperature monitoring is required (resistance
thermometer and temperature-transmitter in standard scope of
delivery); sufficiently qualified ATEX-drive motor is required;
II 3G IIB3 TX °C= in the environment explosive atmosphere
consisting of a mixture with air of flammable substances in the form
of gas, vapour or mist not likely to occur in normal operation but, if it
does occur, will persist for a short period only; temperature
monitoring is required (resistance thermometer and temperature-
transmitter in standard scope of delivery); sufficiently qualified
ATEX-drive motor is required
II 2D TX °C = in the environment explosive atmosphere in the
form of a cloud of combustible dust in air likely to occur in normal
operation occasionally; temperature monitoring is required
(resistance thermometer and temperature-transmitter in standard
scope of delivery); sufficiently qualified ATEX-drive motor is
required;
II 3D TX °C = in the environment explosive atmosphere in the form
of a cloud of combustible dust in air not likely to occur in normal
operation but, if it does occur, will persist for a short period only;
temperature monitoring is required (resistance thermometer and
temperature-transmitter in standard scope of delivery); sufficiently
qualified ATEX-drive motor is required
Standard-version:
The gas shall be free from vapours that would condensate under
the temperature and pressure conditions inside the vacuum
pump.
Version “Aqua”:
The vacuum pump features the corrosion protection coating
CPC and is capable of conveying water vapour (➔ page 11:
Conveying Condensable Vapours). Conveyance of other
vapours shall be agreed upon with Busch. Conveyance of water
or other liquids in liquid phase increases the power consumption
and shall therefore be avoided (risk of drive overload).
The vacuum pump is thermally suitable for continuous operation
(100 percent duty).
Max. permissible number of startings per hour: 12
The vacuum pump is not ultimate pressure proof. Operation with a
closed (“blanked”) suction line will damage the vacuum pump.
The minimum allowed intake pressure is to be read from the
nameplate of the vacuum pump. By means of process control it must
be made sure that the minimum allowed intake pressure will not be
underrun. Under very restricted conditions (➔ page 4: Operation
with Vacuum Relief Valve / Ambient Air Valve) the use of a vacuum
relief valve (optional) with inlet air filter and equipotential bonding (if
required) is permitted.
The vacuum pump is not gas tight. In new conditions a volume flow
of < 0.25 m³/h passes from the environment into the vacuum pump
passing the shaft sealing. This must be taken into account
particularly in case of inerted explosive conveyed media. In case of
doubt seek advice from your Busch representative.
The vacuum pump is not gas tight. Make sure that the installation
space or location is vented such that in case of conveying media
which are dangerous to health no impermissible accumulation of
conveyed media in the environment of the vacuum pump will occur.
The installation space or location must be vented sufficiently.
The approval for use in potentially explosive atmospheres is
valid for the vacuum pump together with the described
measurement and safety equipment. The approval is void if the
system is altered or if the scheduled maintenance is not
complied with. Maintenance must be performed by specifically
instructed personnel only.
CAUTION
During operation the surface of the vacuum pump may reach
temperatures of more than 70 °C.
Risk of burns!
The vacuum pump shall be protected against contact during
operation, it shall cool down prior to a required contact or heat
protection gloves shall be worn.

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•Make sure that all provided covers, guards, hoods etc. remain
mounted
•Make sure that protective devices will not be disabled
•Make sure that cooling air inlets and outlets will not be covered
or obstructed and that the cooling air flow will not be affected
adversely in any other way
•Make sure that the installation prerequisites (➔ page 6:
Installation Prerequisites) are complied with and will remain
complied with, particularly that a sufficient cooling will be
ensured
Conveying Condensable Vapours
Version “Aqua”:
♦Close the shut-off valve in the suction line
♦Warm up the vacuum pump for approx. 10 minutes
At process start:
♦Open the shut-off valve in the suction line
At the process end:
♦Close the shut-off valve in the suction line
♦Open the ambient air valve
♦Operate the vacuum pump for another approx. 10 minutes
♦Close the ambient air valve
♦Regularly drain condensate from the anti-pulsation
chamber (p)
Maintenance
•Prior to disconnecting connections make sure that the
connected pipes/lines are vented to atmospheric pressure
Maintenance Schedule
Note:The maintenance intervals depend very much on the
individual operating conditions. The intervals given below are upper
limits that must not be exceeded.
Particularly heavy duty operation, such like high dust loads in the
environment or in the process gas, other contaminations or ingress
of process material, can make it necessary to shorten the
maintenance intervals significantly.
Monthly
In case of dusty process gases:
Note: In case of dusty process gases despite an inlet air filter
finest dust particles can enter the vacuum pump and collect in
the anti-pulsation chamber. By means of short-time operation
with unrestricted suction (= maximum flow rate) the dust will be
blow out from the anti-pulsation chamber.
♦Open the suction connection
WARNING
Do not open the vacuum pump in potentially explosive
atmosphere.
Risk of explosion!
CAUTION
Due to the corrosion protection coating CPC the vacuum pump
is capable of conveying water vapour.
Very humid process gases and/or adverse operating cycles can
lead to residual condensates, though, which cause corrosion.
If this is the case, it is necessary to counteract residual
condensates by warming up the vacuum pump, conveyance of
ambient air after process end and regular draining of the anti-
pulsation chamber (p).
WARNING
The approval of the vacuum pump for use in potentially
explosive areas remains valid only if the maintenance is
conducted regularly according to the maintenance
schedule below and genuine spare parts and consumables,
approved for use in potentially explosive areas by Busch,
are used exclusively.
Maintenance work must be executed by qualified
personnel, specially instructed in the maintenance of this
type of vacuum pump by Busch.
CAUTION
During operation the surface of the vacuum pump may reach
temperatures of more than 70 °C.
Risk of burns!
DANGER
In case the vacuum pump conveyed gas that was
contaminated with foreign materials which are dangerous
to health, harmful material can reside in filters.
Danger to health during inspection, cleaning or
replacement of filters.
Danger to the environment.
Personal protective equipment must be worn during the
handling of contaminated filters.
Contaminated filters are special waste and must be
disposed of separately in compliance with applicable
regulations.
CAUTION
The vacuum pump emits noise of high intensity in a narrow
band.
Risk of damage to the hearing.
Persons staying in the vicinity of a non noise insulated vacuum
pump over extended periods shall wear ear protection.

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♦Operate the vacuum pump for approx. 5 minutes with
unrestricted suction
•Make sure that the vacuum pump is shut down and locked
against inadvertent start up
In case an inlet air filter (n) is installed:
♦Check the inlet air filter (n), if necessary replace
In case of operation in a dusty environment:
♦Clean as described under ➔ page 13: Every 6 Months
Every 3 Months:
•Make sure that the vacuum pump is shut down and locked
against inadvertent start up
•Check the level of the synchronising gear oil
The level shall be slightly above the middle of the sight glass (f).
The level of the synchronising gear should stay constant over the
lifetime of the oil. If the level does fall, the gear is leaky and the
vacuum pump requires repair (Busch service).
Every 6 Months:
•Make sure that the housing is free from dust and dirt, clean if
necessary
•Make sure that the vacuum pump is shut down and locked
against inadvertent start up
•Remove the acoustic enclosure
Note: Any kind of deposit on the vacuum pump compromises the
explosion safety of the vacuum pump.
Deposits on a fan wheel deteriorate the balancing quality of the fan
wheel, which compromises the explosion safety further.
•Remove the protective grid (r) from the cooling air outlet
•Open the inspection port (f) on the cooling air duct
•Clean the cooling air duct (compressed air)
Note: Make sure that the foam mats do not get soaked with water
•Clean the fan cowlings, fan wheels, the ventilation grilles and
cooling fins
Version with ROTEX-coupling:
♦Remove the drive motor
♦Measure the dimension B of the coupling element
♦Replace the coupling element if the measured value < Bmin
♦Remount the drive motor
•Close the inspection port (f) on the cooling air duct
•Mount the protective grid (r) on the cooling air outlet
•Mount the acoustic enclosure
•Check the electrical connection
•Make sure that the electrical connection of the temperature
monitoring is undamaged
Version with equipotential bonding of the fan cover:
♦Make sure that the earth cable on the fan cover is
undamaged (resistance check)
Version with ATEX-inlet air filter (with equipotential bonding):
♦Make sure that the earth cable on the inlet air filter
housing is undamaged (resistance check)
Version with vacuum relief valve with air filter and equipotential
bonding:
♦Make sure that the earthing cable on the air filter housing
before the vacuum relief valve is undamaged (resistance
check)
Every Year:
•Make sure that the vacuum pump is shut down and locked
against inadvertent start up
In case an inlet air filter (n) is installed:
♦Replace the inlet air filter (n)
•Check the inlet screen, clean if necessary
Version with vacuum relief valve with inlet air filter:
♦Replace the inlet air filter of the vacuum relief valve
•Check the function of the measurement and safety
instrumentation (➔ page 13: Functional Check of the
Measurement and Safety Instrumentation)
Every 20000 Operating Hours, At the Latest after
6 Years:
•Have a major overhaul on the vacuum pump (Busch service)
Checking the Function of the
Measurement and Safety Instrumentation
(version with temperature monitoring only)
•Make sure that the vacuum pump aspirates inert gases and
that there are no potentially explosive atmospheres in the
environment
•Open the lid of the temperature measurement system (g)
•Disconnect the white cable from pin 3, the first red cable from
pin 5 and the second red cable from pin 6
•In order to simulate the resistance thermometer Pt100 set a
variable ohmic resistance to approx. 100 Ω
•Connect the variable ohmic resistance with 3 identical cables
to the pins 3, 5 and 6 of the temperature transmitter as shown
in the sketch (the cable connected to pin 5 compensates the
cable resistance)
WARNING
Risk of electrical shock, risk of damage to equipment.
Electrical installation work must only be executed by
qualified personnel that knows and observes the following
regulations:
- IEC 364 or CENELEC HD 384 or DIN VDE 0100,
respectively,
- IEC-Report 664 or DIN VDE 0110,
- BGV A2 (VBG 4) or corresponding national accident
prevention regulation.

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•Switch on the vacuum pump
•Increase the ohmic resistance to the resistance at shutdown
temperature according to the Equipment Documentation
Measurement and Safety Instrumentation (➔ page 19)
•Make sure that an alarm is released in the system control and
the vacuum pump is shut down automatically
•Decrease the ohmic resistance to a value less than the
shutdown point
•Make sure that the alarm persists
•Make sure that the vacuum pump does not start self-acting
•Switch on the vacuum pump again
•Interrupt the ohmic resistance
•Make sure that a fault indication is released in the system
control and the vacuum pump is shut down automatically
•Reconnect the variable ohmic resistance
•Switch on the vacuum pump again
•Short circuit the variable ohmic resistance
•Make sure that a fault indication is released in the system
control and the vacuum pump is shut down automatically
•Remove the short circuit
•Remove the variable ohmic resistance
•Reconnect the resistance thermometer Pt100 to the
temperature transmitter (white cable to pin 3, first red cable to
pin 5, second red cable to pin 6, ➔ sketch)
•Firmly close the temperature measurement system (g) with the
lid
Overhaul
Busch service will only accept vacuum pumps that come with a
completely filled in and legally binding signed “Declaration of
Contamination” (form downloadable from www.buschvacuum.com).
Removal from Service
Temporary Removal from Service
•Prior disconnecting pipes/lines make sure that all pipes/lines
are vented to atmospheric pressure
Recommissioning
•Observe the chapter Installation and Commissioning
(➔page 6)
Dismantling and Disposal
•Drain the oil
•Make sure that materials and components to be treated as
special waste have been separated from the vacuum pump
•Make sure that the vacuum pump is not contaminated with
harmful foreign material
According to the best knowledge at the time of printing of this
manual the materials used for the manufacture of the vacuum pump
involve no risk.
•Dispose of the used oil in compliance with applicable
regulations
•Dispose of the vacuum pump as scrap metal
WARNING
Improper work on the vacuum pump puts the operating
safety at risk.
Risk of explosion!
Approval for operation will be void!
Any dismantling of the vacuum pump that is beyond of
what is described in this manual must be done by specially
trained Busch service personnel only.
DANGER
In case the vacuum pump conveyed gas that was
contaminated with foreign materials which are dangerous
to health, harmful material can reside in pores, gaps and
internal spaces of the vacuum pump.
Danger to health during dismantling of the vacuum pump.
Danger to the environment.
During dismantling of the vacuum pump personal
protective equipment must be worn.
The vacuum pump must be decontaminated prior to
disposal.
DANGER
In case the vacuum pump conveyed gas that was
contaminated with foreign materials which are dangerous to
health, harmful material can reside in pores, gaps and internal
spaces of the vacuum pump.
Danger to health during dismantling of the vacuum pump.
Danger to the environment.
Prior to shipping the vacuum pump shall be decontaminated
as good as possible and the contamination status shall be
stated in a “Declaration of Contamination” (form
downloadable from www.buschvacuum.com).

MM 1324, 1202, 1252, 1322 AV ATEX-Version
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Troubleshooting
Problem Possible Cause Remedy
The vacuum pump does not reach the usual
pressure
The drive motor draws a too high current
(compare with initial value after
commissioning)
Evacuation of the system takes too long
The vacuum system or suction line is not leak-
tight Check the hose or pipe connections for possible leak
In case a vacuum relief valve/regulating
system is installed:
The vacuum relief valve/regulating system is
misadjusted or defective
Adjust, repair or replace, respectively
The screen in the suction connection (m) is
partially clogged Clean the screen
If cleaning is required too frequently install a
filter upstream
In case a filter (n) is installed on the suction
connection (m):
The filter on the suction connection (m) is
partially clogged
Clean or replace the filter (n), respectively
Partial clogging in the suction, discharge or
pressure line Remove the clogging
Long suction, discharge or pressure line with
too small diameter Use larger diameter
The valve disk of the inlet non-return valve is
stuck in closed or partially open position Disassemble the inlet, clean the screen and the valve as required and reassemble
Internal parts are worn or damaged Repair the vacuum pump (Busch service)
The gas conveyed by the vacuum pump
smells displeasing Process components evaporating under vacuum Check the process, if applicable
WARNING
Vacuum pump for use in potentially explosive atmospheres.
The vacuum pump must only be operated in faultless condition.
Risk of explosion in case of operation of faulty equipment!
A faulty vacuum pump must immediately be removed from service.
In case of faults the cause of which cannot be determined the Busch service must be contacted.
CAUTION
During operation the surface of the vacuum pump may reach temperatures of more than 70 °C.
Risk of burns!
Let the vacuum pump cool down prior to a required contact or wear heat protection gloves.
WARNING
Risk of electrical shock, risk of damage to equipment.
Electrical installation work must only be executed by qualified personnel that knows and observes the following regulations:
- IEC 364 or CENELEC HD 384 or DIN VDE 0100, respectively,
- IEC-Report 664 or DIN VDE 0110,
- BGV A2 (VBG 4) or corresponding national accident prevention regulation.

MM 1324, 1202, 1252, 1322 AV ATEX-Version
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The vacuum pump does not start The drive motor is not supplied with the
correct voltage or is overloaded Supply the drive motor with the correct voltage
The drive motor starter overload protection is
too small or trip level is too low Compare the trip level of the drive motor starter overload protection with the data on the
nameplate, correct if necessary
One of the fuses has blown Check the fuses
The connection cable is too small or too long
causing a voltage drop at the vacuum pump Use sufficiently dimensioned cable
The vacuum pump or the drive motor is
blocked Make sure the drive motor is connected from the power supply
Remove the fan cover
Try to turn the drive motor with the vacuum
pump by hand
If the vacuum pump is blocked:
Repair the vacuum pump (Busch service)
The drive motor is defective Replace the drive motor (Busch service)
(in order not to compromise the explosion
safety of the vacuum pump the coupling must
be adjusted and measured according to a
precisely defined procedure; therefore the
coupling element must be replaced by the
Busch service only)
The vacuum pump is blocked Solid foreign matter has entered the vacuum
pump Repair the vacuum pump (Busch service)
Make sure the suction line is equipped with a
screen
If necessary additionally provide a filter
Corrosion in the vacuum pump from remaining
condensate Repair the vacuum pump (Busch service)
Check the process
Observe the chapter Conveying Condensable
Vapours (➔ page 12)
The vacuum pump was run in the wrong
direction Repair the vacuum pump (Busch service)
When connecting the vacuum pump make
sure the vacuum pump will run in the correct
direction (➔ page 8: Installation)
The drive motor is running, but the vacuum
pump stands still The coupling between the drive motor and the vacuum pump is defective Replace the coupling element
(in order not to compromise the explosion
safety of the vacuum pump the coupling must
be adjusted and measured according to a
precisely defined procedure; therefore the
coupling element must be replaced by the
Busch service only)
The vacuum pump starts, but labours or runs
noisily or rattles
The drive motor draws a too high current
(compare with initial value after
commissioning)
Loose connection(s) in the drive motor
terminal box
Not all drive motors coils are properly
connected
The drive motor operates on two phases only
Check the proper connection of the wires
against the connection diagram
(particularly on motors with six coils)
Tighten or replace loose connections
The vacuum pump runs in the wrong direction Verification and rectification ➔ page 6:
Installation and Commissioning
Foreign objects in the vacuum pump
Stuck bearings
Repair the vacuum pump (Busch service)

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The vacuum pump runs very noisily Defective bearings Repair the vacuum pump (Busch service)
Worn coupling element Replace the coupling element
(in order not to compromise the explosion
safety of the vacuum pump the coupling must
be adjusted and measured according to a
precisely defined procedure; therefore the
coupling element must be replaced by the
Busch service only)
Low oil level in the synchronising gear The synchronising gear is leaky
Repair the vacuum pump (Busch service)
Synchronising gear damaged due to operation
with low oil level Repair the vacuum pump (Busch service)
There is an indication on the control panel /
in the control room that the temperature
monitoring has tripped (permissible
temperature at the outlet of the stage has
been exceeded)
The vacuum pump is shut down
Insufficient air ventilation Make sure that the cooling of the vacuum
pump is not impended by dust/dirt
Clean the fan cowlings, the fan wheels, the
ventilation grilles and the cooling fins
Install the vacuum pump in a narrow space
only if sufficient ventilation is ensured
Ambient temperature too high Observe the permitted ambient temperatures
Temperature of the inlet gas too high Observe the permitted temperatures for the
inlet gas
Mains frequency or voltage outside tolerance
range Provide a more stable power supply
Partial clogging of filters or screens
Partial clogging in the suction, discharge or
pressure line
Remove the clogging
Long suction, discharge or pressure line with
too small diameter Use larger diameter

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Spare Parts
Note: When ordering spare parts or accessories acc. to the table
below please always quote the type (“Type”) and the serial no.
(“No”) of the vacuum pump. this will allow Busch service to check if
the vacuum pump is compatible with a modified or improved part.
The exclusive use of the genuine spare parts and consumables
is a prerequisite for the proper function of the vacuum pump
and for the granting of warranty, guarantee or goodwill.
Your point of contact for service and spare parts in the United
Kingdom:
Busch (UK) Ltd.
Hortonwood 30-35
Telford
Shropshire
TF1 7YB
Tel: [phone]
Fax: [phone]
Your point of contact for service and spare parts in Ireland:
Busch Ireland Ltd.
A10-11 Howth Junction Business Centre
Kilbarrack, Dublin 5
Tel: [phone]
Fax: [phone]
Your point of contact for service and spare parts in the USA:
Busch Inc.
516-B Viking Drive
Virginia Beach, VA 23452
Tel: 1-800-USA-PUMP (872-7867)
Your point of contact for service and spare parts in Canada:
Busch Vacuum Technics Inc.
1740, Boulevard Lionel Bertrand
Boisbriand (Montréal)
Québec J7H 1N7
Tel: [phone]
Fax: [phone]
Your point of contact for service and spare parts in Australia:
Busch Australia Pty. Ltd.
30 Lakeside Drive
Broadmeadows, Vic. 3047
Tel: [phone]
Fax: [phone]
Your point of contact for service and spare parts in New Zealand:
Busch New Zealand Ltd.
Unit D, Arrenway Drive
Albany, Auckland 1311
P O Box 302696
North Harbour, Auckland 1330
Tel: [phone]
Fax: [phone]
Find the list of Busch companies all over the world (by the time of
the publication of these installation and operating instructions) on
➔page 56 (rear cover page).
Find the up-to-date list of Busch companies and agencies all
over the world on the internet at www.buschvacuum.com.
Pos. Part Qty Part no.
- Inlet flange, lower part, with non-
return valve 1 0916 000 670
- Screen 1 0534 000 041
- ATEX-filter cartridge, paper, for
inlet air filter WITH equipotential
bonding 1 0532 134 779
- ATEX-filter cartridge, paper, for
vacuum relief valve WITH
equipotential bonding 1 0532 134 778
- Filter cartridge, paper, for inlet air
filter WITHOUT equipotential
bonding 1 0532 000 004
- Filter cartridge, paper, for vacuum
relief valve WITHOUT
equipotential bonding 1 0532 000 003
- Filter cartridge, polyester, for inlet
air filter WITHOUT equipotential
bonding 1 0532 121 864
- Filter cartridge, polyester, for
vacuum relief valve WITHOUT
equipotential bonding 1 0532 121 863

MM 1324, 1202, 1252, 1322 AV ATEX-Version
0870145304 / 190709
page 19
Equipment Documentation
Measurement and Safety
Instrumentation
Overview
Version with Resistance Thermometer,
without Transmitter
In case the transmitter is furnished by the system supplier or
operator.
Scope of delivery Resistance thermometer with connecting
cable
Type/Marking TR40 Pt100/B/3
Documentation Operating instructions Resistance
thermometers (➔ page 20: Documentation
Resistance Thermometer)
Version with Resistance Thermometer and
Transmitter
Standard scope of delivery for version with temperature monitoring
Scope of delivery Thermometer system, consisting of:
Resistance thermometer with connecting
cable, transmitter, junction box
Type/Marking Resistance thermometer: TR40 Pt100/B/3
Transmitter: TMT181-B
Junction box: 15060603
Brief description:
Resistance thermometer with connected temperature transmitter
Temperature resistor with 3-wire connection.
Temperature transmitter with 3-wire electronics for signal
4 ... 20 mA.
Connection of supply voltage to pins + (positive pole) and - (negative
pole).
Upper limiting values in supply circuit (certified intrinsically safe
electric circuit):
Ui= 30 V; Pi= 800 mW; Ii= 120 mA
Dokcumentation Operating instructions Resistance
thermometers (➔ page 20: Documentation
Resistance Thermometer)
Operating Instructions Temperature
Transmitter (➔ page 42: Documentation
Temperature Transmitter)
Temperatures - -resistances - currents (presets)
Temperature Resistance Current
Under measurement
range
(= sensor short circuit) - - 3.6 mA
Lower measurement
range limit -20 °C 92.160 Ω4.0 mA
Shutdown temperature
(applicable shutdown
temperature see
nameplate of the
vacuum pump)
125 °C 14.944 Ω10.270 mA
130 °C 149.824 Ω10.486 mA
150 °C 157.315 Ω11.351 mA
160 °C 161.043 Ω11.784 mA
165 °C 162.903 Ω12.000 mA
170 °C 164.760 Ω12.216 mA
180 °C 168.465 Ω12.649 mA
190 °C 172.158 Ω13.081 mA
220 °C 183.168 Ω14.378 mA
225 °C 184.993 Ω14.595 mA
230 °C 186.815 Ω14.811 mA
240 °C 190.451 Ω15.243 mA
250 °C 194.074 Ω15.676 mA
270 °C 201.287 Ω16.541 mA
280 °C 204.876 Ω16.973 mA
290 °C 208.453 Ω17.405 mA
300 °C 212.019 Ω17.838 mA
310 °C 215.573 Ω18.270 mA
340 °C 226.166 Ω19.568 mA
350 °C 229.673 Ω20.000 mA
Upper measurement
range limit 350 °C 229.673 Ω20.000 mA
Sensor breakage - - 21.0 mA
More installation
notes:
After connection of the cables to the
switchboard/system control make sure that
the housing is firmly closed and the cable
glands are tightened.

page 20
MM 1324, 1202, 1252, 1322 AV ATEX-Version
0870145304 / 190709
Documentation Resistance Thermometer