Pfeiffer Vacuum BA 251 User manual

PK 0156 BEN/L (1607)
OPERATING INSTRUCTIONS EN
BA 251/501
Rotary Vane Pump

Table of contents
2
Table of contents
1 About this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Validity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Protective equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Proper use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Improper use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
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 Connecting the vacuum side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.3 Connecting the exhaust side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.4 Connecting the cooling water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.5 Connecting to the mains power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.6 Filling up the operating fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.7 Setting up ventilation or measurement connection. . . . . . . . . . . . . . . . . . 18
5.8 Operating fluid level monitoring (option) . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.9 Operating fluid temperature monitoring (option) . . . . . . . . . . . . . . . . . . . . 21
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.1 Before switching on. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.2 Switching on the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.3 Pumping condensable vapours. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.4 Topping up the operating fluid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.5 Switching off and venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.2 Changing the operating fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.3 Changing the kind of operating fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.4 Clean the cooling water chambers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.5 Checking the "V" belt drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.6 Cleaning the gas ballast valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.7 Set/adjust the silencer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
8.1 Shutting down for longer periods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
8.2 Re-starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
8.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
9 Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.1 Rectifying malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
10 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
11 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
11.1 Spare parts packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table of contents
3
11.2 Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
12 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
13 Technical data and dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
13.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
13.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
13.3 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

4
About this manual
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.
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:
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.

About this manual
5
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
Gas ballast valve
Power 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
G

6
Safety
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 70 °C. Use suitable finger guards if necessary.
●When returning the pumps to us please note the instructions in the Service section.
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.
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.
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.

Safety
7
2.3 Proper use
●The vacuum pump may only be used to generate a vacuum.
●Only use the vacuum pump for applications with oxygen concentration ≤21%.
●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.
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
●pumping of gases containing impurities such as particles, dusts and condensate; note
the vapour compatibility levels of the pump
●pumping of substances that tend to sublime
●use of the vacuum pump to generate pressure
●pumping of liquids
●the use of operating fluids not specified by Pfeiffer Vacuum
●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
●operation of the devices in areas with ionizing radiation
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.

8
Transport and storage
3 Transport and storage
3.1 Transport
Remove the locking cap from the vacuum and exhaust flange immediately before con-
necting!
– Check the cone strainer, paying attention to the O-ring.
Use only the eye bolt on the top side of the pump to lift the pump.
Fig. 1: Transporting the pump
3.2 Storage
Check that all the openings on the pump are securely closed.
Fill up the pump with new operating fluid to the top edge of the sight glass.
Store the pump only dry and dust-free indoors within the specified environmental con-
ditions.
– 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 operating fluid before using the pump.
V

Product description
9
4 Product description
4.1 Product identification
To correctly identify the product when communicating with Pfeiffer Vacuum, always have
the information from the rating plate available.
●Pump model and model number
●Serial number
●Type and amount of operating fluid
●Date of manufacture
For motor-specific data, please see the separately installed motor rating plate.
Scope of delivery ●Pump with/without motor
●Operating fluid P3 (for standard pump)
●Centering ring with O-ring
●Flange cover for vacuum and exhaust flange
●Operating instructions
Pump types
Pump type Pump designs
BA 251 Pump on/without base frame
BA 501 Pump on/without base frame

10
Product description
4.2 Function
The water cooled rotary vane pumps of the UnoLinePlus series are fitted with an op-
erating fluid collecting vessel with return line which ensures constant and slow circulation
of the operating fluid. Condensates, dirt and other particles are separated from the oper-
ating fluid and deposited in the sump of the vessel. This system provides the pumps with
a very large supply of operating fluid (BA 251 approx. 17 l, BA 501 approx. 45 l).
The spring loaded pump valves are of wear-resistant stainless steel. The pump is "V" belt
driven. Pump and motor are mounted together in a base frame.
A cooling water controller regulates, contingent on the pump temperature, the cooling
water flow level so that the pump operating temperature is maintained.
Fig. 2: Rotary Vane Pump BA 251 / BA 501
Range of application Being of a robust design, the pumps are especially suitable for vacuum generation in in-
dustrial applications. The pumps can be used as stand-alone units or as the pre-stage to
roots pumps.
1 Operating fluid collecting vessel
with return line
5 Gas ballast valve
17 Connection (G1/2") for external
oil filter (optional)
34 Level switch connection
39 Oiler
40 Sight glass
41 Cooling water controller
43 Motor
50 Venting or measuring
connection
53 Temperature sensor
62 Cooling water drain
90 Operating fluid and
condensate drain valve
91 Operating fluid filler screw (G 1")
98 Vacuum connection
99 Exhaust connection
100 Needle valve
50 98 100 40 34 91 99 1
53
5
62
41
43
39
90
17

Installation
11
5 Installation
5.1 Setting up the pump
Installation location Observe the following requirements when setting up the pump:
●Consider the load-bearing capacity of the installation site.
●Maximum installation altitude 2000 m (above mean sea level)
●Permissible ambient temperature: +12 ... 40°C
●Maximum relative humidity 85%
Fill up with operating fluid before operating the first time (see p. 18, chap. 5.6).
– Amount and type according to rating plate
Set up the pump on an even, horizontal surface.
– The base frame has four holes for anchoring onto the base.
– As an alternative, the base frame can be mounted flexibly on 4 vibration isola-
tors(see p. 43, chap. 12).
When installing the pump in a closed housing, ensure there is sufficient air circulation.
– Sight glass and gas ballast valve must be visible and readily accessible.
– Voltage and frequency information given on the motor rating plate must be visible.
5.2 Connecting the vacuum side
The vacuum connection can be carried out on the vertical port 98 or at the lateral venting
connection 50 (after removing the blank flange).
Remove locking cap from the vacuum flange;
– pay attention to the cone strainer and the respective O-ring in the intake port.
Clear welded lines of any welding scales, loose parts etc. before installation.
The connection between the pump and the vacuum chamber should be kept as short
as possible.
– Depending on the pump type, use metallic hoses or PVC hoses with flange con-
nections.
– Separators, filters etc. may be installed upstream to protect the pump (see acces-
sories). However, please observe the loss of pumping capacity due to the conduc-
tivity of the accessories.
5.3 Connecting the exhaust side
Choose the cross-section of the exhaust line to be at least the size of the nominal
connection diameter of the vacuum pump's exhaust connection.
Piping to the pump must be suspended or supported.
– Physical forces from the piping system must not be allowed to act on vacuum
pumps.
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.
CAUTION
High pressure in the exhaust line!
Danger of damage to the seals and danger of the pump bursting.
Install the line without shut-off valves on the exhaust side.
If there is danger of a build-up of excess pressure (> 1500 hPa abs.) in the lines, ob-
serve all official accident prevention safety regulations.

12
Installation
5.4 Connecting the cooling water
BA series pumps are fitted with a cooling water regulator 41 as standard equipment. The
regulator's job is to keep the pump at its optimum operating temperature.
Requirements for the cooling water
The cooling water must be filtered in all cases. This keeps dirt deposits and organic sus-
pended particles that could accelerate pitting out of the cooling circuit. Complying with
the following requirements for cooling water will prevent corrosion damage:
Connecting cooling
water
The connection must be made so that the flow can be visually checked. The best method
is the free outflow of cooling water via a funnel. If this is not possible because there is no
height difference, a flow indicator must be integrated into the line. Standard flow monitors
or flow indicators may be used.
Screw in cooling water drain screw 62; pay attention to the O-ring.
– Locking screw included in the scope of delivery.
Connecting the cooling water pipe at the inlet (cooling water controller 41)
(G 1/2").
Connecting the cooling water pipe at cooling water outlet 41.1 (G 1/2").
Mounting the cooling
water unit (optional)
The cooling water connection unit includes the following components and is mounted as
shown in Fig. 3:
– Shut-off valve
– Dirt trap
– Pressure monitor and
– Fastening clip
Installing pressure
monitor (option)
The pressure monitor can be used as an effective means of monitoring the pump against
cooling water failure.
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.
Requirements for the cooling water
Water filtered, mechanically pure, optically clear, no turbidity, no sediments, chem-
ically neutral
Min. oxygen content 4 mg/kg
Max. chloride content 100 mg/kg
Max. carbonate hardness for the water temperatures
15 ... 25 °C
30 ... 40 °C
10 ° dH
6° dH
Max. potassium permanganate usage
pH value
10 mg/kg
7 ... 9
Aggressive carbon dioxide and ammonia must not be detectable
Max. electrical conductivity 500 μS/cm
Max. impurity particle size 25 μm
Permitted inlet overpressure range; if the pressure is higher a pressure reducer
valve must be integrated
2000 ... 10000 hPa
Permitted cooling water temperature range 10 ... 30°C

Installation
13
Fig. 3: Cooling water pressure monitor connection
Assembly
Set pressure monitor 3 in the permissible pressure range of 2 ... 10 bar.
– Liquid pressure hammers must not impact the unit.
Always assemble pressure monitor 3 upright with the pressure connection to the bot-
tom;
– pay attention to inflexible and vibration-free pressure lines. If vibrations are to be
expected (not pump induced), then the unit is to be fastened to a wall or to some-
thing similar.
Setting
Set pressure as overpressure based on atmospheric pressure:
Fig. 4: Set pressure monitor 3
Set switch-point phat 2 bar;
– contact 1-4 closes at cooling water pressure of > 2 bar.
Set switch-point plat 1 bar;
– if the pressure drops to < 1 bar, contact 1-2 closes and contact 1-4 opens.
2 Shut-off valve
3 Pressure monitor
3.1 Reducing nipple G 3/8 ... 1/2"
3.2 Dirt trap G 1/2"
3.3 Nipple G 1/2"
3.4 Tee G 1/2"
41 Cooling water controller, (inlet)
41.1 Cooling water connection, out-
let
62 Cooling water drain
62
PK 133 100-T
41.1
G 1/2”
– Contact rating at 230 V/AC 1 : 16 A (resistive load)
– Contact rating at 230 V/AC 15 : 6 A (inductive load)
– Contact rating at 230 V/DC 13 : 0.1 A (inductive load)
8
6
4
2
p >
p
42
1
h
pl

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 drive motor belt pulley has
different diameters for 50 Hz and 60 Hz.
If the pumps are delivered without a motor, permissible pumping rotation speeds are to
be taken into account when selecting the motor (see Technical Data).
Three-phase motor The three phase current motor circuit
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.
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)
Checking the direction of rotation
The direction of rotation must be checked on pumps with three-phase motors! The direc-
tion of rotation is marked on the pump housing by an arrow.
Remove the locking cap from the exhaust flange.
Slacken V-belt.
Switch on the motor briefly (2 to 3 sec.).
– Motor belt pulley turn in a clockwise direction (see the arrow on the pump housing).
If the direction of rotation is incorrect: Swap two phase contacts at the connecting ca-
ble.
Fill up the operating fluid.
Refit belts and guards (see p. 32, chap. 7.5).
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
NOTICE
Do not start with star/delta connection.
Always start motor directly.
CAUTION
Destruction of or damage to the pump!
The pump can be destroyed if the direction of the motor rotation is incorrect.
Remove V-belts and check direction of rotation prior to commissioning the pump.
CAUTION
Operating fluids may leak out!
If the direction of rotation is incorrect, there is a danger that operating fluids may leak at
the vacuum flange.
Always check the direction of rotation before filling in operating fluid.

16
Installation
Fig. 7: Connection example for a three-phase AC motor with PTC resistor tripping device
With motor protection switch
Suitable are protection switches with slow triggering characteristics. The drive motor can
have a power consumption that is higher than the rated current IN. According to DIN EN
60034-1 it is permissible to exceed the rated current IN1.5 times for a period of 2 min-
utes. The setting must permit the overload ability of the motor and can be found in the
following table.
BA 251
BA 501
Frequency converter (valid for three phase motors)
Operation of rotary vane pumps with variable rotation speeds is possible in the mains fre-
quency range between 35 and 60 Hz. The start-up can use a ramp (run-up time: max.
30 s); the shutdown can occur directly.
Electrical connection
with cooling water
pressure monitor
Prepare the circuitry of the motor with cooling water pressure monitor 3 according to the
circuit diagram. A combination with a PTC resistor temperature sensor (3TF) is also pos-
sible.
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)
Voltage [V] Frequency
[Hz]
Motor rating [kW] IN[A] Imax [A]
230 50 11 34.3 322
400 50 11 19.8 186
265 60 13 34.5 331
460 60 13 19.9 191
Voltage [V] Frequency
[Hz]
Motor rating [kW] IN[A] Imax [A]
400 50 15 27.5 261
690 50 15 15.9 151
460 60 18 28.1 267

Installation
17
Fig. 8: Connection with cooling water pressure monitor
3 Pressure monitor
F3 Motor protection switch
PE
L1
L2
L3
N
PE
3

18
Installation
5.6 Filling up the operating fluid
The type and amount of operating fluid should be visible on the pump's rating plate for
every rotary vane pump.
The delivery consignment for the standard pump contains sufficient operating fluid for
one filling. The use of other operating fluids requires prior authorisation from Pfeiffer Vac-
uum.
Permissible operating fluid
●P3 (standard operating fluid)
●Operating fluid for special applications on request
Filling up the operat-
ing fluid
Unscrew operating fluid filler screw 91.
Fill up the operating fluid.
– First fill when the pump is cold: Maximum 3/4 of the min./max. range.
Screw in operating fluid filler screw 91.
Fig. 9: Filling up the operating fluid
Check oiler The bearing oil chambers are factory-filled with P3 lubricant.
Prior to commissioning, check fill level of both oiler 39;
– The oiler should always be filled to a max. of one-third (when the pump is cold); top
up as required.
5.7 Setting up ventilation or measurement connection
The ventilation or measurement connection complies with DN 10 ISO-KF and for serial-
production pumps is sealed vacuum-tight with a blank flange.
Other connection possibilities:
●manually or electrically activated valve for ventilating the pump at standstill
●Vacuum gauge for pressure measurement
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.
91
max
min
.

Installation
19
●Operating fluid feedback for returning operating fluid from the oil mist filter and oil
feedback unit
5.8 Operating fluid level monitoring (option)
A level switch 83.2, which is installed at the pump dome 6 (oil sump) is used for monitor-
ing the operating fluid level.
Electrical connection of the level switch 83.2 must be carried out, so that an alarm is re-
leased and the pump is switched off, if the operating fluid level falls below the permissible
level. The level switch is preset ex works.
Fig. 10: Operating fluid level monitoring
Turn off the vacuum pump, vent to atmospheric pressure and allow to cool.
Drain off operating fluid partially.
Loosen locking screw 83 and screw it out.
Install extension 83.1 between the pump dome and the level switch 83.2 as a protec-
tion against excessively high temperatures.
50
6 Pump dom
83 Locking screw
83.1 Extension
83.2 Level switch
Parameter Operating fluid level monitoring
Protection category IP 67
Current max. 35 mA
Contact Closing contact, normally open at min. filling level
Contact rating PNP output, max. 20 mA
Supply: Voltage 12-30 V DC
83
83.1
83.2 6

20
Installation
Make sure the operating fluid level monitoring is functioning properly!
Varying operating conditions such as change in temperature impact the proper function-
ing of the operating fluid level monitoring.
The pump has to be running.
Create reproducible operating conditions; e.g. measure ultimate pressure or intake
pressure 500 hPa;
– if the intake pressure cannot be measured, then, for example, allow for a time de-
lay of 10 min between the reaction and the alarm
Disable the alarm signal during the warm-up phase or in the case of high process-
dependant gas throughput, if necessary.