Pfeiffer Vacuum OKTA 6000 User manual

PP 0985 BEN/L (1604)
OPERATING INSTRUCTIONS DE
Translation of the original instructions
OKTA 4000/6000, 4000/6000 M
Roots Pump

Table of contents
2
Table of contents
1 About this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Validity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Protective equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Proper use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Improper use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Transport and storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Product description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Product identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1 Setting up the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2 Filling with lubricant. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.3 Connecting the vacuum side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.4 Connecting the fore-vacuum side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.5 Connecting to the mains power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.6 Connecting accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.1 Before switching on the pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2 Switching on the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.3 Switching off and venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.2 Changing the lubricant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.3 Cleaning the suction chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.4 Cleaning the overflow valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.5 Assembling the motor and coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.1 Shutting down for longer periods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.2 Re-starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
9 Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
9.1 Rectifying malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
10 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
11 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
11.1 Spare parts packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
12 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
12.1 Documentation for accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
13 Technical data and dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
13.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
13.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
13.3 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

About this manual
3
1 About this manual
1.1 Validity
This operating manual is for customers of Pfeiffer Vacuum. It describes the functioning
of the designated product and provides the most important information for safe use of
the unit. The description follows applicable EU guidelines. All information provided in this
operating manual refers to the current state of the product's development. The documen-
tation remains valid as long as the customer does not make any changes to the product.
Up-to-date operating instructions can also be downloaded from
www.pfeiffer-vacuum.com.
Applicable docu-
ments
*also available via www.pfeiffer-vacuum.com
1.2 Conventions
Safety instructions The safety instructions in Pfeiffer Vacuum operating instructions are the result of risk
evaluations and hazard analyses and are oriented on international certification stan-
dards as specified by UL, CSA, ANSI Z-535, SEMI S1, ISO 3864 and DIN 4844. In this
document, the following hazard levels and information are considered:
Okta 4000/6000, 4000/6000 M Operating instructions
Declaration of conformity Part of this document
Operating instructions for accessories (order-specifically) see section "accessories"*
For version with magnetic coupling PW 0142 BN*
For version with crown gear coupling, assembly instructions of the coupling manufacturer
DANGER
Imminent danger
Indicates an imminent hazardous situation that will result in death or serious injury.
WARNING
Possibly imminent danger
Indicates an imminent hazardous situation that can result in death or serious injury.
CAUTION
Possibly imminent danger
Indicates an imminent hazardous situation that can result in minor or moderate injury.
NOTICE
Command or note
Command to perform an action or information about properties, the disregarding of
which may result in damage to the product.

4
About this manual
Pictographs
Instructions in the
text
Work instruction: here you have to do something.
Symbols used The following symbols are used consistently throughout in all illustrations:
Vacuum flange
Exhaust flange (fore-vacuum flange)
Electrical connection
Measuring connection for pressure or gas temperature
Sealing gas connection
Prohibition of an action to avoid any risk of accidents, the disregarding
of which may result in serious accidents
Warning of a displayed source of danger in connection with operation of
the unit or equipment
Command to perform an action or task associated with a source of dan-
ger, the disregarding of which may result in serious accidents
Important information about the product or this document
V
M

Safety
5
2Safety
2.1 Safety precautions
●Do not expose any body parts to the vacuum.
●Observe the safety and accident prevention regulations.
●Check regularly that all safety precautions are being complied with.
●Do not carry out any unauthorised modifications or conversions to the pumps.
●Depending on the operating and ambient conditions, the surface temperature of the
pumps may rise above 100 °C. Use suitable finger guards if necessary.
●When returning the pumps to us please note the instructions in the Service section.
The following safety instructions are only valid for the disassembly of the drive
system for a vacuum pump with a magnetic coupling:
●When disassembling the drive system from the pump housing, the strong magnetic
field may influence the function and operational reliability of electrical and electronic
devices.
●Persons with cardiac pacemakers must keep away from the magnetic coupling.
Danger to life!
–Minimum distance: 2 m!
●Disassembled magnetic couplings must be kept away from computers, data storage
media and other electronic components.
●Keep the disassembled components of the magnetic coupling separate at all times.
Danger of crushing!
●Do not allow any magnetised parts into the vicinity of the magnetic coupling. Danger
of injury!
Duty to inform
Each person involved in the installation, operation or maintenance of the vacuum pump
must read and observe the safety-related parts of these operating instructions.
The operator is obligated to make operating personnel aware of dangers originating
from the vacuum pump, the pumped medium and the entire system.
Installation and operation of accessories
Pfeiffer Vacuum pumps can be equipped with a series of adapted accessories. The in-
stallation, operation and maintenance of connected devices are described in detail in
the operating instructions of the individual components.
For information on order numbers of components, see "Accessories".
Use original accessory parts only.

6
Safety
2.2 Protective equipment
Determined situations concerning the handling of vacuum pumps require wearing of per-
sonal protective equipment. The owner, respectively the employer are obligated to pro-
vide an adequate equipment to any operating persons.
2.3 Proper use
●The vacuum pump may only be used to generate a vacuum.
●Use sealing gas, depending on the process.
●Installation, operating and maintenance regulations must be complied with.
●Other accessories, than those described in this manual, must not be used without the
agreement of Pfeiffer Vacuum.
●Only use the standard lubricants for applications with oxygen concentration ≤21 %.
At higher oxygen concentrations use application-specific lubricant after consulting
Pfeiffer Vacuum.
2.4 Improper use
Improper use will cause all claims for liability and warranties to be forfeited. Improper use
is defined as usage for purposes deviating from those mentioned above, especially:
●pumping of corrosive gases
●pumping of explosive media
●operation in potentially explosive areas
DANGER
Danger to health by hazardous substances during maintenance or installation
Depending on the process vacuum pumps, components or operating fluids can be con-
taminated by toxic, reactive or radioactive substances.
Wear adequate protective equipment during maintenance and repairs or in case of
reinstallation.
CAUTION
Risk of injury through hot surfaces
Vacuum pumps can become hot during operation.
Allow the pump to cool before maintenance and repairs.
If necessary wear protective gloves according to EN 420.
WARNING
Increased noise emission!
Increased noise emission can occur within a limited area surrounding the vacuum
pump.
Provide noise protection or
wear hearing protection.
NOTICE
EC conformity
The manufacturer's declaration of conformity becomes invalid if the operator modifies
the original product or installs additional components.
Following installation into a plant and before commissioning, the operator must check
the entire system for compliance with the valid EU directives and reassess it accord-
ingly.

Safety
7
●operation of the pump with open vacuum or fore-vacuum flange open to the atmo-
sphere
●use of the vacuum pump to generate pressure
●connection to pumps or units which are not suitable for this purpose according to their
operating instructions
●connection to units which have exposed voltage-carrying parts
●the evacuation of gases that may form adherent deposits or condensate in the suction
chamber
●Pumping of gases containing impurities such as particles and dusts

8
Transport and storage
3 Transport and storage
3.1 Transport
Fig. 1: Lifting and transporting the pump
Remove the locking cap from the vacuum and fore-vacuum flange immediately before
connecting!
Lift the pump using lifting devices, and use only the ring bolts (threaded holes in the
vacuum flange) provided for that purpose on the top side of the pump.
3.2 Storage
The pumps of standard design are not provided with a corrosion protection. Therefore a
special corrosion protection should be provided by the customer and agreed with the
manufacturer for longer storage. Otherwise should be proceeded as follows.
Check that all the openings on the pump are securely closed.
Store the pump only indoors, preferably at temperatures between -10 °C and +40 °C.
– In rooms with moist or aggressive atmospheres, the pump must be airproof shrink-
wrapped in a plastic bag together with a bag of desiccant.
– After storage periods longer than two years, it is recommended to carry out main-
tenance and change the lubricant before using the pump.
WARNING
Danger from falling and swinging loads!
When lifting the pump there is a danger of falling parts.
Make sure that there are no persons under the suspended load.
Close off and supervise the area under the pump.

Product description
9
4 Product description
4.1 Product identification
To ensure reliable identification of the product, always keep all of the information on the
rating plate to hand, and use it when communicating with Pfeiffer Vacuum:
●Pump model and model number
●Serial number
●Type and quantity of the lubricant
●Max. allowable pump speed
For motor-specific data, please see the separately installed motor rating plate.
Fig. 2: Product identification on the rating plate (for example)
Shipment ●Pump with motor/without motor
– For pumps without motor: coupling half of motorside
●Lubricant P3 (for standard pump)
●Seals for the connection flanges,
●Set of screws for the connection flanges
●Protective cover for the connection flanges
●2 ring bolts for lifting the pump
●Operating manual
Mod.: Okta XXX
Weight: 125 kg
3
D-35641 Asslar
Made in Germany
Mod.-No.: PP W.. ...
n: max. 3600 1/min Oil: P3 1,5 l
S(N): max. 490 m /h
12/2012
Ser. -No.:
1234567895

10
Product description
Variants
4.2 Function
The operating principle of the Roots pumps is based on two synchronous pistons which
rotate in a housing without touching. The pumping effects arise as a result of the oppos-
ing rotation of the two figure-of-eight shaped rolling pistons. While suction chambers are
formed between the rolling pistons and the housing, the rolling pistons continuously form
a mutual seal without touching each other or the housing. This opposing yet synchro-
nised movement of the rolling pistons is achieved by means of a pair of gears mounted
on the extended shaft ends. Lubrication is limited to the two bearing and gear chambers
which are arranged separately from the suction chambers. As the Roots pump is not ca-
pable of compressing against atmospheric pressure it needs to be operated in conjunc-
tion with an upstream backing pump.
A bypass valve that is either cast into or bolted to the housing protects the pump against
overheating.
The version with magnetic coupling has as an alternative to conventional shaft
feedthrough a static seal towards the outside.
Fig. 3: Roots pump Okta 6000
Pump type Pump designs
Standard version Pump in standard version:
●Standard motor
●Connection flanges are designed as ISO flanges
●Overflow valve for protection against thermal overload
●Connections for sealing gas inlet and gear chamber extraction
●Version with magnetic coupling (only M series)
Pressure surge protected
version
Pump in pressure surge protected version; changes relative to the stan-
dard version:
●Parts subjected to pressure are made of spheroidal graphite iron EN-JS
1025; EN-GJS-400-18-LT (GGG 40.3)
●The pump is subjected to a special pressure test (16 bar)
●Connection flanges are designed as DIN flanges (PN 16)
●Version with magnetic coupling (only M series)
Special versions ●Various pressure differentials at the overflow valve
●Special seal materials that are resistant to aggressive media
●Coated pump insides to achieve corrosion protection and/or good anti-
sticking properties
1 Vacuum flange
2 Fore-vacuum flange
(blank flange)
18 Lantern
23 Overflow valve cover
53 Sight glass
122 Lubricant filling screw (2x)
123 Lubricant drain screw (2x)
202 18 23 1 122
123 53
2
S G
S G

Installation
11
5 Installation
5.1 Setting up the pump
When installing the pump, observe the following conditions:
Always place the pump on a firm, even surface.
– Check the load-bearing capacity of the floor at the installation location.
– The vacuum flange serves as the reference surface.
– A drilled hole is provided on each foot for attachment to the mounting surface. Do
not distort the pump when screwing on.
When installing the pump in a closed housing, ensure there is sufficient air circulation.
– Both sight glasses must be visible and accessible for inspection and maintenance
purposes.
– Voltage and frequency information given on the motor rating plate must be visible.
Where stationary installation is involved, anchor the pump on site.
Fill up with lubricant before operating the first time (see p. 11, chap. 5.2).
– Amount and type according to rating plate
Installation
conditions
The vacuum pump must be installed and operated under the following ambient condi-
tions:
5.2 Filling with lubricant
The type and amount of lubricant is visible on the pump's rating plate for each vacuum
pump. Generally only the lubricant used during initial assembly can be used later on.
Permissible lubricants
●P3 (standard lubricant)
●F5 (Lubricant for corrosive gas versions)
●D1 for special applications (e.g. higher operating temperatures)
●Other lubricants on request.
Filling with lubricant Unscrew lubricant filler screws 122.
Fill gear chamber and bearing chamber (on the drive side) with lubricant.
– Fill level on initial fill: approx. 5 mm below the middle of the sight glass.
Installation location Inside; must however be protected against dust deposits
Outside; must however be protected against direct weather influ-
ences
Permissible ambient temperature
range
+5 °C ... +40 °C
Relative humidity Max. 85 %
Installation altitude Max. 2000 m above m.s.l., the rated power of the motor is re-
duced by approx. 10 % for installation altitudes > 1000 m and an
ambient temperature of 40 °C
Power connections according to voltage and frequency information given on the mo-
tor rating plate
NOTICE
Use approved operating fluids only!
The use of operating fluids that have not been approved by Pfeiffer Vacuum shall result
in a limited warranty. In such cases, it is not possible to guarantee that product-specific
performance data will be achieved.
Prior consultation is required before using other application-specific operating fluids.

12
Installation
Fig. 4: Filling with lubricant
Screw in lubricant filler screws 122.
Check lubricant level when the pump is running at operating temperature in final vac-
uum:
– Fill level during operation: as per the sight glass image.
– Check fill level during continuous operation on a daily basis, otherwise each time
the pump is switched on. To add lubricant, switch off the pump and vent it to atmo-
spheric pressure.
Filling the sealing oil
chamber (versions
with RSSR only)
The shaft feedthrough of the drive shaft is sealed with sealing oil-covered radial shaft
seals, and is fed by an oiler 47. The type of sealing oil is the same as the lubricant.
Fill up oiler to halfway with lubricant.
– Oiler 47 should always be filled to a max. of halfway (when the pump is cold); top
up as required.
max.
min.
47 122
WARNING
Toxic vapours!
Danger of poisoning when igniting and heating synthetic operating fluids (e.g. F4/F5)
above 300 °C.
Observe the application instructions.
Do not allow operating fluid to make contact with tobacco products; observe safety
precautions when handling chemicals.
The lubricant expands when the pump heats up, which could cause lubricant to
leak if the oiler is overfilled.

Installation
13
5.3 Connecting the vacuum side
The connection between the pump and the vacuum chamber should be kept as short
as possible and should have at least the nominal diameter of the pump flange. Use a
greater nominal diameter on line lengths > 5 m.
Piping to the pump must be suspended or supported.
– Physical forces from the piping system must not be allowed to act on vacuum
pumps.
Clear welded lines of any welding scales, loose parts etc. before installation.
5.4 Connecting the fore-vacuum side
Choose the cross-section of the exhaust line to be at least the size of the nominal
connection diameter of the Roots pump’s exhaust flange.
Lay the pipes in such a way that the Roots or backing pump will not be subjected to
any mechanical tension.
– Suspension components should be integrated into the piping.
– Ensure that mating flanges are in a parallel position.
Lay piping from the pump sloping downward so that no condensate can flow back into
the pump; otherwise fit a condensate separator.
– If an air trap is created in the system, then a device for draining condensation water
must be provided at the lowest point.
WARNING
Exposed, rotating rolling pistons!
Fingers and hands can become crushed when the intake flange is open.
Keep all body parts out of operating range of the rolling pistons.
Use a wooden handle to rotate the rolling pistons during cleaning.
NOTICE
Danger of intake of solid particles!
Even in clean processes, fouling from the system must be anticipated during initial com-
missioning.
Use a suitable start-up strainer at the intake connection (see accessories).
Ensure that this strainer is only removed when the risk of solid particles entering the
pump can be excluded.
Note loss of pumping speed if necessary.
WARNING
Emission of toxic substances from the exhaust!
Danger of poisoning from emitted gases or vapours, which can be detrimental to health
and/or can pollute the environment, depending on the particular application.
Comply with the applicable regulations when working with toxic substances.
Only officially approved filter systems may be used to separate and remove these
substances.

14
Installation
5.5 Connecting to the mains power supply
The pumps are supplied with three-phase motors for different voltages and frequencies.
The applicable motor type is shown on its rating plate.
The three-phase cur-
rent motor circuit
The direction of rotation must be checked on pumps with three-phase motors!
The connections U1 - L2, V1 - L1 and W1 - L3 result in a clockwise rotation of the motor
shaft as seen looking towards the motor fan.
Delta Connection
The three coils are connected in series with the connection point connected to the mains.
The voltage of each coil is the same as the mains voltage whereas the mains current is
the cube root of the coil current. Delta connections are denoted by the symbol ∆. The
voltage between the mains supply lines is called mains voltage. The mains current is the
current which flows in the supply lines.
Fig. 5: Motor coil and connecting plate of Delta Connection (for low voltage)
Star Connection
The ends of the three coils are connected at the star center. The terminal voltage is the
cube root of the coil voltage; the mains and the coil current are the same. Star connec-
tions are denoted by the symbol Y.
DANGER
Voltage-bearing elements
Danger to life from electric shock.
The electrical connection can be carried out only by trained and authorised electri-
cians.
Disconnect the power supply and secure it against being switched back on.
Ensure the system is adequately earthed.
NOTICE
Excess voltage!
Danger of destroying the motor.
Power connections must comply with local regulations. Voltage and frequency infor-
mation given on the motor rating plate must correspond to the mains voltage and fre-
quency values.
To protect the motor and supply cable in case of malfunction, mains fuse protection
must be implemented. Recommended: Type K slow blow circuit breaker.
NOTICE
Thermal motor overload!
Inadequate cooling at low motor speeds.
When operating the pump with frequency converter, follow the rotation speed range,
specified in the technical data.
W2 U1
L1
V2 V1
W1 U2
L3
L2
W2 U2 V2
U1 V1 W1
L1
L2 L3

Installation
15
Fig. 6: Motor coil and connecting plate of Star Connection (for high voltage)
Visual inspection of the direction of rotation
Check the direction of rotation of the pump after switching on for the first time:
– To do this, switch the pump briefly ON and OFF again (for a max. of 5 seconds).
Compare the direction of rotation of the motor and the motor ventilator with the direc-
tional arrow on the housing cover.
– Looking from the motor side, the correct direction of rotation is to the right in a clock-
wise direction.
If the direction of rotation is incorrect: Swap two of the three phase contacts at the con-
necting cable.
Fig. 7: Checking the direction of rotation
Motor protection With PTC temperature sensors (3PTC)
Pump motors equipped with PTC temperature sensors (3PTC) in the stator windings can
be connected to a PTC resistor tripping device for protection against overload. Other ap-
proved motor temperature monitoring can be used also by the operator.
Tripping devices store the shutdown event and need to be manually switched back on
again via the integrated RESET button or via the external RESET S3. Mains-ON is de-
tected as an automatic RESET.
Set up the connections so that the directional rotation indicated on the pump is main-
tained, regardless of the representations in the current flow diagram.
W2
U1
L1
V2
V1
W1
U2
L3
L2
W2 U2 V2
U1 V1 W1
L1
L2 L3

16
Installation
Fig. 8: Connection example for a three-phase AC motor with PTC resistor tripping device
5.6 Connecting accessories
The following accessories are not included in the delivery, and can be ordered separate-
ly:
Sealing gas connec-
tion
The evacuation of high-boiling media (e.g. solvents) can be damaging to the lubricant.
Damage can be avoided by letting in sealing gas (process-specifically) into the shaft pas-
sageways between the operating chamber and the gear chamber.
The sealing gas line should be connected at both connections of each bearing bracket
(4 x G 3/8").
Connect gas cylinder 325 with pressure reducer 324 to flow meter 315, adjust amount
of sealing gas (see p. 19, chap. 6.2)
Fig. 9: Connecting sealing gas
Using a flushing de-
vice
Depending on requirements, the Roots pump can be flushed continuously or temporari-
ly(see p. 19, chap. 6.2), if the evacuated medium is causing severe contamination or de-
posits in the suction chamber. The injection nozzle is set to the maximum fluid quantity
of the pump at a pressure of 3000 hPa.
USControl voltage
S1OFF button
S2ON button
S3RESET button, external
K1 Contactor
F1 ... F4 Fuses
T1... T3 PTC resistor sensor
H1 Tripping indicator
M Motor, 3-phase
1) Only for devices with two
relay outputs
2) Only for MSR type
3) Only for order no.:
P 4768 051 FQ
N
L1
M
3
L2
L3
F1 - F3
K1
10 11
AC 220 ... 240 V
Us F4
UVW
S1
S2
k1
K1
H1
S3
2)
A1 A2 T1 T2 Y2Y1 24 21 22 14 1211
2) 2) 1) 1) 1)
T1...T3
3)
10 Bearing bracket
315 Flow meter with dosing
valve
324 Pressure reducer
325 Gas cylinder
10
10
324
315
325

Installation
17
Attach flushing adapter to the vacuum flange.
For sealing and throughflow monitoring install a shut-off valve and a flow meter with
dosing valve into the inflowing line.
Fig. 10: Installing a flushing device
Installing a protective
strainer
If there is a risk that solid particles will be carried along in the evacuation process then a
protective strainer should be installed in the intake connection piece to protect the Roots
pump (see accessories).
Attaching gear cham-
ber extraction
When the vacuum chamber is evacuated quickly (<1 min), each of the gear chambers
should be pumped out via an oil separator in the connection line to the fore-vacuum side.
Do this as follows:
Unscrew both lubricant filler screws (G 3/4") and the blanking plug from the pressure-
side measurement connection (G 3/8"); check the O-rings.
Instead of the filler screws, screw in screw couplings with e.g. small screw-in flanges
(DN 10 KF); use O-rings.
Flange on both oil separators and install the lines.
Fig. 11: Gear chamber extraction
NOTICE
Risk of damage to the pump!
During the flushing and cleaning procedure the flushing liquid and the process medium
can pass over into the bearings and oil chambers and can stick there.
To protect the bearings during cleaning, sealing gas must always be used.
M

18
Installation
Heating connection The bearing brackets can be tempered in order to prevent condensation or heat dissipa-
tion. If a heating connection is provided (factory retrofitting is possible) for both caps
heating coils, one each, are inserted inside and bolted from the outside. The ports in the
caps (two each) are equipped with threaded nipple with 1/4 " female thread.
Assembly
Remove plugs 128 and 129 from threaded hole G 1/4“.
Bridge both connections 128 on one side of the Roots pump.
Connect either the supply and return pipe of the heater to 129.
Fig. 12: Heating connection
128/129 Threaded plugs
G 1/4"
G 1/4"
128
129
129
128 128

Operation
19
6Operation
6.1 Before switching on the pump
Check lubricant levels at both sight glasses and at the oiler as well.
Operate shut-off units in the exhaust line in such a way that they open before or at the
same time as starting the pump.
Protect the pump sufficiently from taking in contaminants by means of suitable precau-
tions (e.g. protective strainer); if necessary, check lubricant regularly or replace at
shorter intervals.
Check pump for visible damage and only start up if it is in the correct condition.
Ensure that the suction chamber is free of foreign particles.
6.2 Switching on the pump
Switch on the Roots pump at the same time as the backing pump or after the backing
pump;
– switch off Roots pump in the event of failure of the backing pump.
The overflow valve is open at the beginning of evacuation in the high pressure range. It
protects the Roots pump from thermal overload. The overflow valve closes starting at a
differential pressure below 25/20 hPa between the suction side and the compression
side.
Adjusting the amount
of sealing gas
Depending on the operating pressure, the empirical value for the supplied sealing gas
amount is between 1% (for a high operating pressure) and 8% (for a lower operating
pressure) of the effective suction capacity. The set quantity of sealing gas influences the
effective suction capacity and the achievable ultimate pressure.
Open gas cylinder 325.
Set a maximum pressure of 2500 hPa at pressure reducer 324.
At dosing valve 315, adjust the desired quantity of sealing gas on the flow meter.
Equation for calculating the sealing gas throughflow
QS= Sealing gas flow under standard conditions [Nm3/h]
p = Intake pressure [hPa]
p0= Ambient pressure under standard conditions [hPa]
∆p= Differential pressure max. [hPa]
pV= Fore-vacuum pressure [hPa]
AS= Proportion of sealing gas in the operating gas flow (0.01 AS0.08)
Sth= Rated suction capacity of the Roots pump [m3/h]
Example for Okta 4000 M with 50 hPa intake pressure and 8% sealing gas quantity:
CAUTION
Hot surface!
Danger of burns if hot parts are touched. Depending on the operating and ambient con-
ditions, the surface temperature of the pump may rise above 100 °C.
In this case, use suitable finger guards.
Sth·p·A
S
p0
QS =
QS
QS
==
= 19,2 Nm3
/h
4860 · 50 · 0,08
1013

20
Operation
This applies to exhaust pressures > 100 hPa:
Adjusting the flush-
ing fluid quantity
Set max. flushing quantity in acc. with the following table; use flow meter.
– On pumping stations without an intermediate condenser or collecting containers
the quantity of fluid should be selected according to the smallest pump in the pump-
ing station:
Dry the pump completely inside after flushing.
6.3 Switching off and venting
In the case of clean processes that convey pure gases, the pump can be switched off in
every pressure range and directly after the process end. When the evacuated medium
in the suction chamber causes strong contamination or deposits, the vacuum pump
should be flushed with air or nitrogen after the process end.
If venting of the vacuum chamber is not required, then the intake port valve must be
closed before switching off the pump in order to prevent venting of the vacuum chamber.
Sth·(p
V- p·A S
p0
QS =Δ )
NOTICE
High pressure in the sealing gas line when the pump is switched off!
Risk of damage to the pump seals.
Lower sealing gas pressure to < 1200 hPa or stop sealing gas feed immediately.
Pump type max. flushing quantity
Okta 18000 3 l/min
Okta 8000 2 l/min
Okta 6000 1.75 l/min
Okta 4000 1.5 l/min
Okta 2000 1.0 l/min
Okta 1000 0.5 l/min
Okta 250/500 0.25 l/min
Okta 300/600 0,25 l/min
NOTICE
High pressures are generated in the working chamber of the pump!
Exceeding the specified flushing quantities can lead to destruction of the pump.
Do not exceed the indicated flushing quantity at 3000 hPa in the indicated time peri-
od.
Drain the fluid again.
Always check the vapour compatibility of the downstream pumps.
WARNING
Exposed, rotating rotors!
Danger of crushing! The rotors will continue to run under vacuum after the motor has
been switched off.
Never disconnect any pipe connections at the vacuum flange or fore-vacuum flange
or any sealing gas lines while the pump is running.