Pfeiffer Vacuum UNO User manual

Rotary Vane Pumps
PD 0010 BE/C (0511)
UNO/DUO 250 A
Betriebsanleitung • Operating Instructions

2
Index
Modifications reserved
1. Safety Precautions .................................. 3
1.1. For Your Orientation........................................................... 3
1.2. Pictogram Definitions........................................................ 3
2. Understanding The Pumps...................... 4
2.1. Main Features..................................................................... 4
2.2. Differences Between The Pump Types.......................... 4
3. Installation ............................................... 5
3.1. Preparations For Installation............................................ 5
3.2. Pump Assembly And Location......................................... 5
3.3. Connecting The Vacuum Side.......................................... 5
3.4. Connecting The Exhaust Side.......................................... 5
3.5. Connecting To The Mains Power Supply....................... 6
3.6. Special Models................................................................... 9
4. Operations .............................................. 10
4.1. Filling Up And Checking The Operating Fluid.............. 10
4.1.2.Operating Fluid F5 ............................................................ 10
4.2. Switching The Pump ON And OFF................................. 11
4.3. Operating The Pump With Gas Ballast Valve.............. 11
4.3.1.Standard Model................................................................ 11
4.3.2 Corrosive Gas Model ....................................................... 11
4.4. Pumping Off Dry Gases................................................... 12
4.5. Pumping Off Vapours....................................................... 12
5. What To Do In Case Of Breakdown...... 12
6. Maintenance .......................................... 13
6.1. Changing The Operating Fluid........................................ 13
6.2. Cleaning The Oil Filter ..................................................... 13
6.3. Re-Setting The Silencer ................................................. 14
6.4. Cleaning The Gas Ballast Valve..................................... 15
6.5. Cleaning The Silencer..................................................... 15
6.6. Shutting Down For Longer Periods............................... 17
7. Service .................................................... 18
8. Technical Data ....................................... 19
8.1. Dimensions........................................................................ 20
9. Accessories............................................ 20
10. Spare Parts ............................................. 20
Declaration Of Contamination .................... 21
Declaration Of Conformity ........... (last page)
Page
Please note:
Current operating instructions are also available via
www.pfeiffer-vacuum.net.

3
Danger of damage to the pump or system.
CAUTION
☞Read and follow all the instructions in this manual.
☞Inform yourself regarding:
☞Hazards which can be caused by the pump;
☞Hazards which can arise in your system;
☞Hazards which can be caused by the medium being
pumped.
☞Avoid exposing any part of your body to vacuum.
☞Observe all safety and accident prevention regulations.
☞Check regularly that all safety requirements are being
complied with.
☞Do not carry out any unauthorised conversions or
modifications on the pump.
☞When returning the pump to us please note the shipping
instructions in Section 7.
1.1. For Your Orientation
Instructions in the text
➡Operating instructions: Here, you have to do something
Symbols Used
The following symbols are used throughout in the illustrations:
Vacuum-flange
Exhaust flange
Gas ballast
Power connection
Position-Numbers
Identical pump and accessory parts have the same position
numbers in all illustrations.
Danger of injury
from moving parts.
WARNING
Danger of personal injury.
WARNING
1. Safety Precautions
1.2. Pictogram Definitions
Important note.
☞
PLEASE NOTE
Danger of burns from touching hot parts.
WARNING
Danger of an electric shock.
WARNING
Danger of poisoning.
DANGER

4
2.1. Main Features
2. Understanding Pumps
2.2. Differences Between The Pump Types
Type Stage Nominal Attainable
flow rate Final Pressure
at 50 Hz (Total, without
Gasballast)
UNO 250 A one stage 267 m3/h < 5.0 •10-2 mbar
DUO 250 A two-stage 267 m3/h < 3.0 •10-3 mbar
The UNO 250 A is a single stage and the DUO 250 A is a two
stage rotary vane pump.
Special features:
– Pressurised oil lubrication
– Hydraulically controlled high vacuum safety valve
– Optional: Oil filter systems, Condensate separator,
Operational monitoring systems.
Proper Use
– Rotary Vane Vacuum Pumps may only be used to generate
vacuum.
– Installation, start-up, operating and maintenance
instructions must be observed.
– Accessories other than those named in this manual may
not be used without the agreement of Pfeiffer Vacuum.
Special Models
Helium tight model:
– Operating Fluid P3
– Leak rate < 1 •10-5 mbar l/s
– Additional radial shaft seal (total of 3) with sealing oil
chamber (oiler)
– Option: Special gas ballast valve for inert gas inlet (N2) to
prevent atmospheric air entering the system.
Korrosivgasausführung:
– Operating fluid F5
– Leak rate < 1 •10-5 mbar l/s
– Additional radial shaft seal (total of 3) with sealing oil
chamber (oiler)
– Vanes and sight glasses made from special materials.
– Option: Special gas ballast valve for inert gas inlet (N2) to
prevent atmospheric air entering the system.
Improper Use
The following are regarded as improper:
– The pumping of corrosive gases (except with corrosive
gas processes version).
– The pumping of gases which are contaminated with
particles, dust and condensate. Avoid condensation and
sublimation; take note to the vapour compatability.
– The pumping of explosive gases.
– Operating the pump in locations where there is an explosi-
on hazard.
– The Rotary Vane Vacuum Pumps may not be used for the
purpose of generating pressure.
– The pumping of liquids.
– Uses not covered above, and, in particular:
– Connection to pumps and units which is not permitted
according to their operating instructions.
– Connection to units which contain touchable and voltage
carrying parts.
Improper use will cause any rights regarding liability and
guarantees to be forfeited.
Rotary Vane Vacuum Pumps UNO 250 A, DUO 250 A
1 Vacuum flange,
2 Exhaust flange,
3 Motor,
5 Control voltage connection (for pump monitoring)
15 Casing
18 Baffle Plate
28 Support Stand
42 Operating fluid filler screw
43 Operating medium drain screw
44 Sight glass
45 Gas ballast valve, complete;
46 Screw plug
182 Pressure gauge
183 Cover for filter cleaning
205 Screw plug for adjusting the silencer
15 205 42 183 46 1 2 182 45
44 43 18 5 28 3

5
3.4. Connecting The Exhaust Side
Pressure can rise to dangerous levels in
exhaust lines.
Lay exhaust lines without built-in shutoff
devices. If a shut-off device is installed for
internal operating reasons or if there is a risk of
excess pressure developing in the lines, official accident
prevention regulations must be complied with.
The exhaust line diameter should not be less than 63 DN.
The line from the pump must be laid with a downward
gradient so that condensate is prevented from flowing back
into the pump. Otherwise a trap must be installed.
Auspuffleitung nicht kleiner als DN 100 von der Pumpe aus
fallend verlegen, damit kein Kondensat in die Pumpe
zurückläuft. Andernfalls Abscheider einbauen.
Der Auspuffdruck darf 1,5 bar nicht überschreiten.
Expelled gases and vapours can represent a
hazard to health and/or the environment.
For this reason the relevant regulations must
always be complied with when working with
toxic substances. Only officially approved filters
may be used for the separation of such substances. This also
applies when handling toxic or chemically unstable gases
and to gases susceptible to polymerisation or to the formation
of peroxide (see 9. Accessories).
WARNING
CAUTION
3. Installation
3.1. Preparations For Installation
Do not carry out any unauthorised conversions
or modifications on the pump.
Fill up with operating fluid before operating the
first time (included in a separate pack in the
delivery consignment). When transporting use
only the eyebolts provided for the purpose.
3.2. Pump Assembly And Location
➡Where stationary installation is involved, anchor the pump
on site.
➡Sight glass 44 on the front side must be visible and gas
ballast valve readily accessible.
When filled with operating fluid, do not tilt the
pump otherwise operating fluid could escape
via the exhaust opening.
➡When installing the pump in a closed housing, ensure
there is sufficient air circulation.
CAUTION
CAUTION
WARNING
3.3. Connecting The Vacuum Side
➡Keep the connection between the vacuum chamber and
pump as short as possible.
➡Remove all scaling and loose particles from welded lines
prior to assembly.
– To protect the pump, separators, filters and cooling traps
etc.(see Section 9. Accessories) can be fitted upstream of
the pump. However, the conductance value of the
accessory causes a reduction in volume flow rate.
Where rotary vane vacuum pumps are
anchored, no forces from the piping system
should be allowed to act on the pump.
Suspend, decouple or support all piping
concerned with the pump.
CAUTION
44
Maximum angle of inclination to each side 10Þ
Maximum erection height 2000 m N.N.
Ambient temperature maximum 40 °C and minimum 12 °C
Maximum relative humidity 85%

6
3.5. Connecting To The Mains Power Supply
Power connections must comply with local
regulations. Voltage and frequency information
given on the rating plate must correspond to
the mains voltage and frequency values.
When the electrical connections have been
completed, carry out the earthed conductor
test.
The pump must be disconnected from the power before
opening the terminal box.
When switching on for the first time, check the direction of
rotation:
Checking The Direction Of Rotation
Check the direction of rotation of the pump
before filling up with operating medium.
➡Remove blank flange on the exhaust flange,
– do not take off sieve strainer from vacuum flange 1 and
exhaust flange 2.
➡Switch on pump for a short time (max. 3 seconds).
Motor/motor fan must turn clockwise (see arrow P on
motor fan cover).
➡If direction of rotation is incorrect: Interchange two
phases on the connecting cable.
CAUTION
WARNING
Power section with motor to be protected
Checking The Direction Of Rotation
P
Three phase motors with PTC
Pumps fitted with these motors are used primarily in systems
or in closed rooms. The motors of these pumps are fitted with
three PTCs which are built into the stator windings. The
connection of a tripping unit will protect the pump against
overloading (see connection example).
Tripping unit:
PTC tripping unit with two switchover contacts at the output
manufactured by Ziehl, type MSR 220 F (see Section 9,
„Accessories“), AEG type TMA 4R or Siemens type 3 UN8 004.

7
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)
PP1008/k
T1...T3
3)
Connection example for water cooled canned motors with Tripping unit (typ MSR 220 F, order no.: P 4768 051 FQ
USControl Voltage
S1 Pressure key „OFF“
S2 Pressure key „ON“
S3 Control switch (reset key)
K1 Motor contactor
F1 ... F4 Fuses
T1... T3 Temperature sensors
H1 Signal lamp
M Motor, 3-phase
1) Only for units with two relais
outputs
2) Only for type MSR
3) Only for order no. P 4768 051 FQ
Tripping Units Type MSR save the switch-off occuring on thermal overload and it is necessary to manually reset via the integrated key or via the
externally connected key S3 to switch back on. Switching on via the mains is automatically recognised as a reset.
Voltage see rating plate
The Three Phase Current Motor Circuit
The three phase motor winding consists of three identical
coils.
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.
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 connections are
denoted by the symbol Y.
A star connection three phase motor for 400 V mains voltage
has a coil voltage of 230 V.
W2 U1
L1
V2 V1
W1 U2
L3 L2
W2 U2 V2
U1 V1 W1
L1 L2 L3
W2
U1
L1
V2
V1
W1
U2
L3 L2
W2 U2 V2
U1 V1 W1
L1 L2 L3
Motor coil and connecting plate of Delta Connection Motor coil and connecting plate of Star Connection

8
Helium tight and corrosive gas models UNO/DUO 250 A
45 Gas ballast valve
118 Radial shaft seal
122 Armature
126 O-ring
128 O-ring
132 Support washer
133 Radial shaft seal
134 Double supporting ring
135 Spacer
136 Oiler
138 O-ring
168 O-ring
169 Locking screw for connecting the gas ballast valve
(when no valve is fitted)
45/169
122
132
133
135
126
128
118
134
136
168
138
Important: The instructions in 4.1.2. must be
observed when working with synthetic
operating medium F5.
CAUTION
Oiler 136 should always be filled to the half way
mark, maximum, (when the pump is cold); top
up as necessary. When the pump becomes
warm, the lubricant expands and can spill over
if the oiler is too full.
CAUTION

9
3.6. Special Models
Helium Tight Models
– Helium tight models are distinguished by their high level
tightness to the atmosphere.
– Helium tight models are operated, as standard, with opera-
ting medium P3.
– The rotor shaft is sealed with an additional radial shaft
seal. The cavity between the radial shaft seals 133 is filled
with operating medium and is supplied by the oiler 136.
– If the gas ballast valve 45 is not available, the opening
should be closed with the locking screw 169 or a special
gas ballast valve with dosing device and hose connection
for flushing gas is available (on request).
Corrosive Gas Models
– Corrosive gas models are manufactured with special
materials.
– The rotor shaft of both versions is sealed with an
additional radial shaft seal. The cavity between the radial
shaft seals 118 and 133 is filled with operating medium and
is supplied by the oiler 136.
– If the gas ballast valve 45 is not available, the opening
should be closed with the locking screw 169 or a special
gas ballast valve with dosing device and hose connection
for flushing gas is available (on request).
– Corrosive gas models are operated, as standard, with
synthetic operating medium F5.

10
4.1. Filling Up And Checking The Operating
Fluid
Standard version pumps are tested with opera-
ting fluid P3. Guarantees relating to attainment
of final pressures and trouble free functioning
apply only providing this operating fluid is used.
The delivery consignment contains sufficient operating fluid
for one filling (valid only for P3).
Pumps for special applications (e.g. for pumping corrosive
gases) can be operated with special operating fluids such as
F5 and other Pfeiffer Vacuum operating fluids. The use of
such operating fluids requires prior authorisation from the
manufacturer.
P3 must be disposed of in accordance with local waste dispo-
sal regulations.
➡Remove operating fluid filler screw 42.
➡Fill up with operating fluid included in the consignment
(only for P3); refer to rating plate for correct quantity.
➡Replace operating fluid filler screw 42; be careful with the
O-ring.
CAUTION
➡Check operating fluid level only when the pump is warm
and running and vacuum connection 1 and gas ballast
valve are closed.
➡The level of operating fluid must always be between the
top and the middle of the sight glass 44.
➡Topping up operating fluid is possible when the pump is
running and in final vacuum operations.
➡In non-stop operations check operating fluid daily,
otherwise whenever the pump is switched on.
4. Operations
Rotary Vane Vacuum Pumps UNO/DUO 250 A
1 Vacuum flange,
2 Exhaust flange,
3 Motor,
5 Socket for control voltage
15 Casing
28 Support stand
42 Operating fluid filler screw
43 Operating medium drain screw
44 Sight glass
45 Gas ballast valve, complete;
182 Pressure gauge
183 Cover for filter cleaning
15 42 1 2 182 45
44 43 18 5 28 3
Sight glass 44
Operating fluid
level for the first
filling and during
operation
4.1.2. Operating Fluid F5
Only the synthetic operating fluid F5 may be used for corrosi-
ve gas model pumps. The use of other operating fluid must be
cleared by the manufacturer.
When working with synthetic operating media,
the manufacturer’s directions must be
observed.
If ‘’F5’’ is heated above 250°C, toxis vapours
which can harm the airways are given off.
Do not allow ‘’F5’’ to come into contact with tobacco products
(danger of poisoning when ignited). The precautions
necessary in the handling of chemicals must be observed.
Operating fluids containing toxic or aggressive
substances require special treatment. The
instructions for handling such media must be
observed.
Never fill into pumps which contain mineral oil
residues.
If there is a noticeable loss of operating fluid,
the radial shaft seals should be checked.
If operating fluid is leaking out underneath the
casing 15 from the opening between the
support stand 28 and motor 3, the radial shaft
seal must be replaced. Please contact your local Pfeiffer-
Service (see Section 7.).
☞
PLEASE NOTE
CAUTION
DANGER
WARNING