LEYBOLD TURBOVAC TW 250 S User manual

Vacuum Solutions Application Support Service LEYBOLD VACUUM
TURBOVAC
TW 250 S
Wide-Range Turbomolecular
Pump with Integrated or External
Frequency Converter
Cat. Nos.
113 52, 114 37,
800150V0007 /09 /11 /12 /13 /14 /16
and pumps modified by
Leybold Vacuum
Operating Instructions
GA05137_1102
View our inventory

GA 05137_1102 - 12/2003
Contents
Page
Safety information. . . . . . . . . . . . . . . . . . . . . . . . . 3
1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Use and media compatibility . . . . . . . . . . . . . . . . 5
1.1 Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Standard equipment. . . . . . . . . . . . . . . . . . . . . . . 6
1.3 Ordering data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.4 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.1 Operating environment. . . . . . . . . . . . . . . . . . . . 16
2.2 Attach the pump to the vacuum chamber . . . . . 17
2.3 Forevacuum connection. . . . . . . . . . . . . . . . . . . 19
2.4 Cooling the pump. . . . . . . . . . . . . . . . . . . . . . . . 21
2.5 Connect the purge gas and airing valve . . . . . . 22
2.6 Electrical connection. . . . . . . . . . . . . . . . . . . . . . 24
2.7 Interface description. . . . . . . . . . . . . . . . . . . . . . 29
3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.1 Switching on. . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.2 Shutting down. . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.3 Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.4 Bakeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.5 Removing the pump from the system . . . . . . . . 37
4 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.1 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.2 Service by LEYBOLD. . . . . . . . . . . . . . . . . . . . . 38
5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . 39
6Spare parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
EEC Manufacturer’s Declaration . . . . . . . . . . . . 43
Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figures
The references to the diagrams, e.g. (2/10), consist of the figu-
re number and the item number, in that order.
Warning
Identifies working and operating procedures which must be
strictly observed to prevent hazards to persons.
Caution
Indicates working and operating procedures which must be
strictly observed to prevent damage to or destruction of the
appliance.
We reserve the right to alter the design or any data given in
these operating instructions.
The illustrations are approximations.
2

GA 05137_1102 - 12/2003
Safety Information
3
Safety information
Failure to observe the following precautions could
result in serious personal injury:
Warning The turbomolecular pump must only be
operated in the proper condition and under
the conditions described in the Operating
Instructions.
Mechanical hazards
Warning Never expose any parts of the body to the
vacuum.
The high-vacuum flange must be solidly
mounted to the vacuum chamber. If the
mounting is not sturdy enough, pump block-
age could cause the pump to break loose;
internal pump components could be thrown
in all directions. Never operate the pump (in
bench testing, for example) without proper
flanging to the vacuum chamber.
Under vacuum conditions the pump may
take up to one hour to run down, when ven-
ting to atmospheric pressure it may take up
to one minute. During the time the pump is
running down, the green LED at the fre-
quency converter will flash, indicating that
the rotor has not yet arrived at standstill.
When shutting down by switching off the
power supply voltage, there will be only
enough power for the LEDs down to a
speed of the pump of approximately 200
Hz. Thus the pump may still turn without a
LED being on. For this reason, when swit-
ching off without venting, wait for approxi-
mately 15 minutes after the LEDs have tur-
ned off until the pump has arrived at stand-
still.
After a mains power failure the pump can
run up automatically once more.
Electrical hazards
Warning Mains voltage may be present at the power
failure airing valve, the purge gas valve or
the venting valve.
The pump may be operated only with a sui-
table frequency converter and suitable
connector cables.
Route all cables so as to protect them from
damage.
Do not expose the pump, the frequency
converter or the connections to water.
The frequency converter must only be
connected to power supplies which meet
the requirements for functional extra low
voltage with positive isolation in accordance
with IEC 364 (VDE 0100, Part 410, or local
regulations) (SELV).
When the connector cable is attached, the
outputs at the frequency converter are not
free of voltage.
Thermal hazards
Warning During operation the pump can become so
hot that there is a danger of burns (up to
approx. 80 °C, 176 °F).
Provide protection against contact with the
hot components.
Hazards caused by materials and
substances
Warning The forevacuum line must be tight. Hazar-
dous gases can escape at leaks or the
gases being pumped can react with air or
humidity.
If the pump has previously handled hazar-
dous gases, implement the proper precau-
tionary measures before opening the intake
or exhaust connection.
If necessary, use gloves, a respirator and/or
protective clothing and work under an
exhaust hood.

Safety Information
Failure to observe the following precautions could
result in damage to the pump:
Caution The pumps are not suitable for pumping
aggressive or corrosive media or those
which contain dust.
Install a micropore filter when pumping
media which contains dust.
Observe the information on media compati-
bility at the beginning of these operating
instructions.
Caution Never touch the rotor. Touching the rotor
may cause injury and damage the rotor
bearing.
Caution If foreign objects could pass from the vacu-
um chamber into the pump, install a wire
mesh splinter guard. Foreign objects which
enter the pump through the intake would
cause serious damage to the rotor. Dama-
ge resulting from foreign objects in the rotor
section are excluded from guarantee cover-
age.
Caution Self-protection of the pump is not ensured
in case of unsufficient cooling.
Caution Unplug any connectors only when the
mains voltage is switched off and the pump
does no longer turn (the green LED is off).
Separating the connections while the mains
power is still applied or while the pump is
still turning may destroy the TURBO.DRIVE
300.
Caution Ensure correct polarity when connecting
the frequency converter.
Caution Exposure of the pump to accelerating for-
ces must be avoided or reduced to such an
extent that the rotor unit will not be excited
by vibrations. In the case of critical applica-
tions you must consult our Applications
Dept. first.
Caution If the pump was exposed to impacts, for
example by an earthquake, during start up
take note especially of any apparent noises.
In the case of any unusual noises coming
from the pump, inform Leybold Service.
Caution Pumps with integrated frequency converter
need to be shipped to the Leybold Service
with the frequency converter. Pump and fre-
quency converter must not be separated.
Caution The pump must only be opened by such
persons who have been authorised by Ley-
bold to do so.
4GA 05137_1102 - 12/2003

Description
1 Description
Use and media compatibility
The TURBOVAC TW 250 S is a turbomolecular pump
with integrated or external frequency converter. It is de-
signed to evacuate vacuum chambers down to pressure
levels in the high vacuum range. It is suitable for pum-
ping air and clean, non-corrosive gases. A forevacuum
pump is required for its operation.
The TW 250 S has been manufactured according to the
state-of-the-art and approved safety regulations. Even
so in the case of improper installation or when impro-
perly used there can be risks or damage may be caused.
These pumps are not suitable for
- pumping liquids or gases containing dust or particu-
lates
- pumping aggressive, explosive or reactive gasses
- operation without a forevacuum pump.
If reactive gases in low concentrations must be pumped
please consult with Leybold.
During operation the pressure inside the pump is so low
that there is no danger of ignition (at pressures below
about 100 mbar). A hazardous condition will be created
if flammable mixtures enter the hot pump at pressures
above 100 mbar. During operation the pump can reach
temperatures as high as 110°C (230 °F). Ignition sparks
could occur in case of damage to the pump and these
could ignite explosive mixtures.
All seals are prone to leaks. In case a seal fails, there is
the risk that hazardous gases may escape. Introduce
the appropriate safety measures depending on the
media being pumped in each case.
We would be glad to consult with you as regards the
media which can safely be handled with this unit.
Warning Never expose any parts of the body to the
vacuum.
5
GA 05137_1102 - 12/2003

Description
6GA 05137_1102 - 12/2003
1.1 Design
The pumps comprise essentially the pump housing, a
multi-stage rotor with the stator group, and the drive.
The rotor consists of a turbomolecular pump stage and a
Holweck stage. The Holweck pumping stage increases
the permissible forevacuum pressure level markedly
when compared with the classical turbomolecular pump.
The rotor shaft runs in two ceramic ball bearings, lubri-
cated with grease.
The pump is driven by a brushless DC split-cage motor.
In this motor the rotor and stator windings are separated
by a vacuum-tight can. Consequently the rotor runs insi-
de the vacuum while the stator is outside the vacuum.
This eliminates any need of vacuum feedthroughs.
Acircuit board and a fan are installed in the pump. The
circuit board is equipped with a temperature sensor and
a resistor code.
Water cooling is available as optional equipment; this is
bolted to the housing of the pump.
KF type components can be connected directly to the
forevacuum flange using a clamping yoke.
The pumps exhibit a threaded hole, used as the connec-
tion point for venting. This port is sealed at the factory
with a screw and gasket ring.
The TURBOVAC TW 250 S has an additional purge gas
device. The purge gas is also connected at the venting
port.
The pump is driven by an electronic frequency converter
TURBO.DRIVE S. All functions like, for example, speed
control, pump sensing or temperature monitoring are
monitored by the TURBO.DRIVE S. This unit is powered
by an external power supply.
1.2 Standard equipment
The pumps are shipped sealed in a PE bag with a desic-
cant to absorb moisture.The maximum useful life of the
desiccant is one year.
The forevacuum flange is blank-flanged with centering
ring with FPM sealing ring and a clamping yoke. The
venting port is sealed with a screw and a gasket ring.
The high-vacuum connections elements are not part of
the standard equipment.
Asuitable DC coupling for the power supply is included:
In the case of pumps with integrated frequency conver-
ter it is supplied with the pump.; in the case of pumps
with a separate frequency converter it is supplied with
the frequency converter.
————————————-
PE = Polyethylene
FPM = Fluororubber, resistant to temperatures up to 150°C (302 °F)

Description
7
GA 05137_1102 - 12/2003
Fig. 1 Section through the pump
High-vacuum
flange
Rotor
Stator
Bearing
Motor
Fan
Bearing
Venting port
(purge gas)
Forevacuum
connection

Description
8GA 05137_1102 - 12/2003
1.3.2 Frequency converter and accessories for the frequency converter
Frequency converter (only for pumps without frequency converter)
Frequency converter TURBO.DRIVE S
with RS 232 interface 800070V0002
with RS 232 interface and mounted heat sink 800070V0005
with RS 485 interface 800070V0003
with RS 485 interface and mounted heat sink 800070V0006
with Profibus interface 800070V0004
Connecting cable pump - frequency converter
1.0 m long 152 47
2.5 m long 864 49
3.0 m long 864 40
5.0 m long 864 50
Drive (X3)
HEATSINK
DC 24 V
(X4)
Power supply SITOP 24 V / 10 A 152 50
• supplies the TURBO.DRIVE S with 24 V DC
24 V DC cable (TURBO.DRIVE S – OEM power supply)
3 m 200 12 732
5 m 200 12 733
10 m 200 12 734
20 m 200 12 735
Mains cable for power supply, 2 m long
with EURO plug / conductor ferrules 800102V0001
with US plug 5-15P / conductor ferrules 800102V1001
OEM power supply (with screw terminals)
1.3 Ordering data
1.3.1 Pumps
TURBOVAC TW 250 S
DN 100 ISO-K, air cooling,
without frequency converter, with coarse splinter guard 113 52
DN 100 ISO-K, water cooling,
with TURBO.DRIVE S with Profibus, without splinter guard 114 37
DN 100 ISO-K, air cooling,
owithout frequency converter, with coarse splinter guard 800150V0007
DN 100 ISO-K, air cooling, with TURBO.DRIVE S
with Profibus, with coarse splinter guard 800150V0009
DN 100 ISO-K, air cooling,
with TURBO.DRIVE S with RS 232, without splinter guard 800150V0011
DN 100 CF, air cooling,
with TURBO.DRIVE S with RS 232, without splinter guard 800150V0012
DN 100 ISO-K, air cooling,
with TURBO.DRIVE S with RS 485, without splinter guard 800150V0013
DN 100 CF, air cooling,
with TURBO.DRIVE S with RS 485, without splinter guard 800150V0014
DN 100 ISO-K, water cooling, with TURBO.DRIVE S
with Profibus, with coarse splinter guard 800150V0016

Description
9
GA 05137_1102 - 12/2003
TURBO.POWER 300 800100V0002
• supplies the TURBO.DRIVE S with 24 V DC
• plug & play cables
• desktop unit or rack mountable
24V DC Power cable
(TURBO.DRIVE S – TURBO.POWER 300)
1 m 800094V0100
3 m 800094V0300
5 m 800094V0500
10 m 800094V1000
20 m 800094V2000
Mains cable for TURBO.POWER 300, 3 m long
with EURO plug / IEC mains plug 800102V0002
with US plug 6-15P / IEC mains plug 800102V1002
Power supply unit - plug and play
TURBO.CONTROL 300 800100V0001
• supplies the TURBO.DRIVE S with 24 V DC
• plug & play cables
• desktop unit or rack mountable
• with power switch
• with start/stop switch for the turbomolecular pump
• remote control
• status LEDs and status relays
24V DC Control cable
(TURBO.DRIVE S – TURBO.CONTROL 300)
1 m 800091V0100
3 m 800091V0300
5 m 800091V0500
10 m 800091V1000
20 m 800091V2000
Mains cable for TURBO.CONTROL 300,
3 m long
with EURO plug / IEC mains plug 800102V0002
with US plug 6-15P / IEC mains plug 800102V1002
START
NORMAL
POWER
ERROR
START
STOP
TURBO.CONTROL 300
1
0
Power supply and control unit
TURBO.POWER 300
T5 A~ 250V
T5 A~ 250V
100- 240VAC

Description
10 GA 05137_1102 - 12/2003
Display PDA* (display unit for
parameters, requires the software
"Turbo.Drive Panel”) upon request
data cable and adaptor
Required "Turbo.Drive Panel" software
for the display PDA with operating system OS
4.0 to 4.x, 3.5" floppy 800110V0104
PC software "Turbo.Drive Server" for Windows 95
and higher, CD-ROM*
• Soft panel
• Display, change, save and compare
parameter lists
• Integration of customer’s software
• Record parameter data 800110V0102
Adaptor RS232/RS485 for 220 V/Euro plug 800110V0101
GSD file for Profibus DP upon request
*Can be used in connection with the following
interfaces:
- For frequency converters with RS232 interface.
- For frequency converters with RS485 interface,
a RS232/RS485 adaptor is required.
Accessories for serial interfaces
Plug for connector REMOTE with integrated
ON/OFF switch for the pump
(Sub-D plug, 9 way) 152 48
Heat sink for frequency converter 800110V0001
Top hat rail adaptor (mounting aid for
TURBO.DRIVE S and TURBO.POWER 300) 800110V0003
on
off
Mechanical accessories

Description
11
GA 05137_1102 - 12/2003
1.3.3 Accessories for the pump
Splinter guard coarse 800132V0101
Splinter guard fine 800132V0102
Vibration absorber
DN 100 ISO-K 800131V0100
DN 100 CF 500 071
Water cooling unit with G 1/8” connection 200 06 255
Adaptor G 1/8“ — 1/4“ Swagelok 200 12 686
Power failure airing valve, 220/240 V AC 280 71
Power failure airing valve, 24 V AC 280 85
Venting valve, 220/240 V AC 280 70
Venting valve, 110/120 V AC 280 72
Venting valve, 24 V AC 280 73
Venting valve, 24 V DC 280 74
Mounting kit for power failure airing valve
or venting valve 863 20
Flange heater DN 100 CF
(only for pumps with CF flange)
230 V 854 27
110 V 854 28
Centering ring (Al) with O-ring (FPM)
DN 100 ISO-K 268 42
Clamps (Set of 4 pieces)
Galvanized steel, clamping range 19 to 27 mm 267 01
Galvanized steel clamping range 25 to 35 mm 267 02
Stainless steel, clamping range 19 to 27 mm 887 99
Copper gasket rings for CF flange (Set of 10 pieces) 839 45
Set of hex. screws with nuts, screws
and washers for CF flange 839 04

Description
12 GA 05137_1102 - 12/2003
1.4 Technical data
1.4.1 TURBOVAC
High-vacuum connection DN 100 ISO-K
DN 100 CF
Pumping speed at 10-5 mbar
N2230 l·s-1
Ar 210 l·s-1
H280 l·s-1
He 150 l·s-1
Max. gas throughput
N23.7 mbar·l·s-1 at 10-1 mbar
Ar 1.6 mbar·l·s-1 at 10-2 mbar
H21.1 mbar·l·s-1 at 10-1 mbar
He 2.4 mbar·l·s-1 at 10-1 mbar
Compression
N23.0·107at 3 mbar
Ar 1.0·107at 6 mbar
H25.0·102at 0.2 mbar
He 3.2·103at 0.7 mbar
Ultimate pressure
with two-stage, oil-sealed
rotary vane pump < 2·10-8 mbar
Max. permissible forevacuum pressure for N23 mbar
Recommended forevacuum pumps
• TRIVAC D 2,5 E
• ECODRY M 15
• Diaphragm pump upon request
with ultimate pressure < 3 mbar and
pumping speed at 3 mbar > 2 m3·h-1
• (at purge gas operation) TRIVAC D 8 B
Operating speed 51,600 rpm
Run-up time approx. 3 min
Forevacuum connection DN 16 KF
Venting connection thread M 5
Weight
without frequency converter 5.0 kg
with frequency converter 5.8 kg
Noise level < 55 dB(A)
Type of protection IP 20
Option pump with water cooling
Cooling water connections G 1/8“
Cooling water data see Section 2.4
1.4.2 TURBO.DRIVE S
Supply voltage 24 V ± 5%
Residual ripple < 2%
When operating a TW 250 S
Max. power consumption 140 W
Max. peak current, input side 6 A
Required power output from the
power supply ≥150 W
Max. length of the DC cable (shielded)
at 3 x 1.5 mm25 m
at 3 x 2.5 mm220 m
Load capability, relay output 42 V, 0.5 A
Ambient temperature
during operation 10 - 45 °C
storage - 15 - + 70 °C
Temp. of the cooling surface 10 - 55 °C
Only Part No. 800070V0004 10 - 50 °C
Power loss ≤20 W
Relative air humidity 5 to 85 %
non-condensing
Type of protection IP 20
Weight, approx. 0.7 kg
1.4.3 Power supply SITOP 24 V / 10 A
AC input voltage 120/230 V, 50/60 Hz
Tolerance 93 - 132 V
187 - 264 V
Recommended circuit breaker
(characteristic C) 16 A
Power consumption 270 W
DC output voltage 24 V ± 1%
DC output current 0 - 10 A
Weight, approx. 1 kg
Mounting DIN rail
Screw-type terminals 0.5 - 2.5 mm2
22 - 12 AWG
Ambient temperature
during operation 0 - 60 °C
storage -25 - + 85 °C
Cooling air convection
Type of protection IP 20
Safety to EN60950 SELV
RI suppression to EN 55022 limit curve B
Noise immunity to EN 50082-2 incl. Table A4
UL508 FILE E143289
Technical data for TURBO.POWER 300 and TURBO.CON-
TROL 300 see instructions for the power supplies

Description
13
GA 05137_1102 - 12/2003
M5; 8 tief b1
h4
b2
a2
h5
3
b3
h3
b4
h2
DN 16 KF
α
h8
a4
a
a3
a1
h1
h6
h7
h
4
211
175
DN 100 ISO-K
Ø 171
Ø 130
Ø 160
Ø 116,5
52
145
152
56
b1b2αh2h3h4h5h8
—————————————————————————————
20 22 22°40 20 37 14 12
Fig. 2 Dimensional drawing for the pump, dimensions in mm
Pump with water cooling and frequency converter Frequency converter mounted with distance sleeves
REMOTE (X1)
RS485 X5)
ERROR
POWER
STATUS
TURBO.DRIVE S
88,4
229,2
179,2
100
REMOTE (X1)
RS485 X5)
ERROR
POWER
STATUS
TURBO.DRIVE S
100
14 175,2
239,2
Pump without frequency converter

Description
14 GA 05137_1102 - 12/2003
e
windebohrungen
4
, 13 tief zur zusätzlichen
festigung der Pumpe
f
estigungswinkel
V
entils
146,6
105°
7,5°
120°
Fig. 3 Bottom of the pump, dimensions in mm
102
10
1
10-1
10-2
10-3
10-4
10-510-5 10-2 10-1 1 10
TRIVAC D 16 B
10-4 10-3
TRIVAC D 8 B
TURBOVAC TW 250 S
ECODRY M
50 Hz
mbar
-1
Fig. 4 Operation diagram for nitrogen
Inlet pressure
Throughput
Limit
forevacuum
pressure
N2
Boreholes M4,
13 mm deep, for
additional fastening
of the pump
Boreholes M4, 8 mm
deep, for fastening of the
power failure airing valve

Description
15
GA 05137_1102 - 12/2003
27
67
18,5
29,5
100
50
100
23
23,5
34,5
18,1 63,8
DRIVE (X3)
24 V DC
(X4)
RS485 (X5)
REMOTE (X1)
ERROR
POWER
STATUS
14,5
TURBO.DRIVE S
HEAT SINK
HEAT SINK
HEAT SINK
HEAT SINK
Fig. 5 Dimensional drawing for the frequency converter with RS 485 interface and of the OEM power supply; dimensions in mm
Drive (X3)
HEAT SINK
DC 24 V
(X4)
100 63,8
100
18,1
50
40
HEAT SINK HEAT SINK
DRIVE (X3) 24 V DC
(X4)
Profibus (X105) HIGH LOW
Rear panel of the
Profibus version

Connections
16 GA 05137_1102 - 12/2003
2 Connections
Caution The pumps are not suitable for pumping
aggressive or corrosive media or those
which contain dust.
Install a micropore filter when pumping
media which contains dust.
Observe the information on media compati-
bility at the beginning of these operating
instructions.
Do not open the packaging until immediately before
installation.
Do not remove the covers and blind flanges on the pump
until just before attachment to the equipment to ensure
that assembly is carried out under the cleanest possible
conditions.
Caution Never touch the rotor. Touching the rotor
may cause injury and damage the rotor
bearing.
Warning During operation the pump can become so
hot that there is a danger of burns (up to
approx. 80 °C, 176 °F).
Provide protection against contact with the
hot components.
2.1 Operating environment
The maximum permissible ambient temperature of the
pump is 40 °C (104 °F). Do not expose the pump or the
frequency converter to dripping or spraying water
If the pump is used within a magnetic field, the magnetic
induction at the surface of the pump housing may not
exceed:
B = 5 mT if impinging radially and
B = 15 mT if impinging axially.
Install shielding equipment as appropriate if these values
are exceeded.
The standard pump version without frequency converter
is resistant to radiation up to 103Gy.
Places of installation up to 1000 m above sea level
(3300 ft) are possible without restrictions. At altitudes
over 1000 m heat dissipation by the ambient air is impai-
red. Please consult us.
The frequency converter must not be operated in explo-
sive gas atmospheres.
——————————————-
1 mT (milliTesla) = 10 G (Gauß)
1 Gy (Gray) = 100 rad

2.2 Attach the pump to the
vacuum chamber
Warning The high-vacuum flange must be solidly
mounted to the vacuum chamber. If the
mounting is not sturdy enough, pump block-
age could cause the pump to break loose;
internal pump components could be thrown
in all directions. Never operate the pump (in
bench testing, for example) without proper
flanging to the vacuum chamber.
If the pump should suddenly seize, an ensuing deceler-
ation torque of up to 200 Nm will have to be absorbed by
the system. To accomplish this, a minimum of 4 clamping
bolts are required for securing an ISO-K type high-vacu-
um flange.
Clamping bolts must be torqued down to 20 Nm (15 ft-
lb).
Connections
17
GA 05137_1102 - 12/2003
Legend for Fig. 6
1 High-vacuum connector flange
2 Wire mesh splinter guard
3 Forevacuum connection
4 Venting port (purge gas), M5
5 Connection for frequency converter
Fig. 6 Connection elements
1
2
543
In most applications the pump is flanged to the high-
vacuum flange at the apparatus. The pump can be
mounted and operated in any desired attitude. No sup-
port is required.

Connections
18 GA 05137_1102 - 12/2003
Design with ISO-K clamp flange
Lay the O-ring on the centering ring.
The O-ring must be positioned so as to be smooth and
flat; it must not be twisted. Then position the outer ring.
Acollar flange with circlip and the appropriate gasket
may be used to connect the pump.
Acollar flange is required when using ultra-vacuum sea-
ling gaskets.
The order numbers for the flange components are given
in the Leybold Catalog.
Caution If foreign objects could pass from the vacu-
um chamber into the pump, install a wire
mesh splinter guard. Foreign objects which
enter the pump through the intake would
cause serious damage to the rotor. Dama-
ge resulting from foreign objects in the rotor
section are excluded from guarantee cover-
age.
Insert the splinter guard so that the surface curvature is
at the top and apply some pressure lightly at the rim so
that the splinter guard engages. The splinter guard must
not touch the rotor.
If dust could pass from the vacuum chamber into the
pump, then a micropore filter must be installed between
the vacuum chamber and the pump.
The pump is precision balanced and is generally opera-
ted without a resonance damper. To decouple extremely
sensitive equipment and to prevent transfer of external
vibrations to the pump a special resonance damper is
available for mounting at the high-vacuum flange.
Detach the shipping flange from the high-vacuum flange
and remove the desiccant. Pay attention to scrupulous
cleanliness when making the connection.
Fig. 8 Using type ISO-K flanges
Centering ring
O-ring (FPM)
ISO-K flange
Outer centering
ring
Clamp
Correct
Wrong
Fig. 7 Installing the splinter guard
Press here

Connections
19
GA 05137_1102 - 12/2003
2.3 Forevacuum connection
As forevacuum pump we recommend using the dry
compressing ECODRY M15 piston pump or a TRIVAC
two-stage rotary vane vacuum pump, e.g. the D 2,5 E.
Connect the clean forevacuum line; see Fig. 9. The
connecting flanges must be clean an undamaged. The
cross section of this line must be so wide that safe ope-
ration of the pump can be ensured.
Remove the three screws and the clamping yoke.
Remove the shipping flange.
Slide the KF flange from the forevacuum line onto the
centering ring, slide the clamping yoke over the flange,
insert and tighten the three screws.
Warning The forevacuum line must be tight. Hazar-
dous gases can escape at leaks or the
gases being pumped can react with air or
humidity.
Figure 14 is a schematic diagram of a pump system
incorporating a turbomolecular pump and a TRIVAC
forevacuum pump with an anti-suckback valve.
Aseparate safety valve is provided for oil-sealed foreva-
cuum pumps without an anti-suckback valve. The safety
valve prevents oil flowing back from the forevacuum
pump into the turbomolecular pump when the system is
not running.
To ensure that the forevacuum space at the turbomole-
cular pump is kept largely free of oil vapors during ope-
ration, as well, we recommend installing an adsorption
trap in the forevacuum line. An adsorption trap is not
required when using a dry compressing forevacuum
pump like the ECODRY M 15, for example.
Provide a roughing line to achieve the shortest cycle
times.
Ensure that the pump is sufficiently isolated against
resonances (vibrations) generated by the forevacuum
pump.
1Clamping yoke
2 Screws
3 Centering ring
4 KF flange from
the forevacuum line
Fig. 9 Connecting the forevacuum line

0
1
2
3
4
5
0 1 2 3 4
mbar
Connections
20 GA 05137_1102 - 12/2003
operation not possible
water cooling required or
air cooling with
max. ambient temperature 25 °C (77 °F)
and separate frequency converter
water cooling required or
air cooling with
max. ambient temperature 25 °C (77 °F),
frequency converter at the pump
air cooling required,
max. ambient temperature 40 °C (104 °F)
and separate frequency converter
Throughput N2
Fig. 10 Cooling requirements for the TW 250 S when pumping Nitrogen/air;
All data for pumps mounted with the high-vacuum flange top
All cooling water measurements are made with cooling water temperature 20 °C and flow 30 l/h
Forevacuum pressure
Pump with high-vacuum flange DN 100 ISO-K and aluminium housing
0
1
2
3
4
5
0 1 2 3 4
mbar
operation not possible
water cooling required or
air cooling with
max. ambient temperature 25 °C (77 °F)
and separate frequency converter
air cooling required,
max. ambient temperature 25 °C (77 °F),
frequency converter at the pump
Throughput N2
Forevacuum pressure
Pump with high-vacuum flange and stainless steel housing
Ambient temperature Frequency converter at the pump Separate frequency converter
DN 100 ISO-K DN 100 CF DN 100 ISO-K DN 100 CF
> 40 °C (104 °F) Operation not possible
≤40 °C (104 °F)
Operation only
after consultation
with Leybold
(Water cooling
required, curve B)
Operation
not possible
air cooling
possible
curve C
Water cooling
required
curve D
≤25 °C (77 °F) air cooling
possible
curve B
air cooling
possible
curve E
air cooling
possible
curve A
air cooling
possible
curve D
A
B
C
D
E