Pfeiffer Vacuum HENA 201 User manual

OPERATING INSTRUCTIONS
EN
Translation of the Original
HENA 201 | HENA 251 | HENA 301/301 S
Rotary vane pump

2/58

Table of contents
1 About this manual 5
1.1 Validity 5
1.1.1 Related documents 5
1.1.2 Variants 5
1.2 Target group 5
1.3 Conventions 6
1.3.1 Abbreviations 6
1.3.2 Pictographs 6
1.3.3 Product sticker 6
1.3.4 Symbols used 6
1.3.5 Instructions in the text 7
2 Safety 8
2.1 General safety instructions 8
2.2 Safety instructions 8
2.3 Safety precautions 10
2.4 Product limits of use 11
2.5 Proper use 11
2.6 Foreseeable improper use 11
3 Product description 12
3.1 Product identification 12
3.2 Shipment 12
3.3 Function 12
3.3.1 Operating principle 13
3.3.2 Operating fluid return via the float valve 14
4 Transportation and Storage 15
4.1 Transport 15
4.2 Storage 15
5 Installation 17
5.1 Installing the vacuum pump 17
5.2 Connecting the vacuum side 17
5.3 Connecting the exhaust side 18
5.4 Establishing mains connection 18
5.4.1 Three phase motor with 12-pin terminal board 19
5.4.2 Three phase motor with 6-pin terminal board 20
5.4.3 Checking the direction of rotation 20
5.4.4 Motor protection 21
PTC thermistor temperature sensor (3TF) 21
Motor protection switch 21
Frequency inverter operation for vacuum pumps with 3-phase mo-
tor
22
5.5 Refilling operating fluid 22
5.6 Connecting accessories 23
5.6.1 Operating fluid temperature monitoring (option) 23
5.6.2 Operating fluid level monitoring (option) 24
5.6.3 Connecting a heat exchanger (optional) 25
6 Operation 28
6.1 Commissioning 28
6.2 Switching on 28
6.3 Operating the rotary vane pump with gas ballast 29
6.3.1 Gas ballast valve – standard version 29
6.3.2 Gas ballast valve – retrofit kit with solenoid valve 29
6.4 Refilling operating fluid 30
Table of contents
3/58

6.5 Switching off the vacuum pump 31
6.5.1 Venting the vacuum chamber 31
6.5.2 Maintaining the vacuum in the chamber 31
7 Maintenance 32
7.1 Maintenance instructions 32
7.2 Checklist for inspection and maintenance 32
7.3 Changing the operating fluid 34
7.3.1 Determine degree of aging of P3 operating fluid 34
7.3.2 Draining the operating fluid 35
7.3.3 Rinsing and cleaning 36
7.3.4 Changing the operating fluid filter 36
7.4 Change the exhaust filter in the operating fluid separator 37
7.5 Cleaning the intake strainer 39
7.6 Cleaning the gas ballast filter 39
7.7 Changing operating fluid type 40
8 Decommissioning 41
8.1 Shutting down for longer periods 41
8.2 Recommissioning 41
8.3 Disposing of the vacuum pump 41
9 Malfunctions 42
10 Service solutions from Pfeiffer Vacuum 44
11 Spare parts 46
11.1 Spare parts packs 46
11.1.1Operating fluids – maintenance level 1 46
11.1.2Maintenance kit – maintenance level 2 47
11.1.3Set of seals 47
11.1.4Overhaul kit and set of seals 47
11.1.5Set of vanes 47
11.1.6Coupling set 47
12 Technical data and dimensions 48
12.1 General 48
12.2 Technical data 48
12.3 Dimensions 51
13 Accessories 55
Declaration of conformity 56
Table of contents
4/58

1 About this manual
IMPORTANT
Read carefully before use.
Keep the manual for future consultation.
1.1 Validity
These operating instructions are for customers of Pfeiffer Vacuum. They describe the function of the
designated product and provide the most important information for safe usage of the product. The de-
scriptions comply with applicable directives. All information provided in these operating instructions refer
to the current development status of the product. The documentation remains valid as long as the cus-
tomer does not modify the product in any way.
1.1.1 Related documents
Hena 201/251/301/301 S Operating instructions
Declaration of conformity A part of this document
Current documents are available from the Pfeiffer Vacuum Download Center.
1.1.2 Variants
These instructions apply to HenaLine series vacuum pumps:
Pump type Pump version
Hena 201
Hena 251
Hena 301
Pump in standard version
●Vacuum connection and gas outlet: G2"
●Operating fluid return via the float valve
●Motor protection via 3 TF at three phase motors
●Gas ballast valve
●4 exhaust filters
Hena 301 S Pump with limited intake pressure:
●3 exhaust filters
●max. continuous intake pressure ≤ 100 hPa
1.2 Target group
This operating instructions are aimed at all persons performing the following activities on the product:
●transport,
●setup (installation),
●usage and operation,
●decommissioning,
●maintenance and cleaning,
●storage or disposal.
The work described in this document is only permitted to be performed by persons with the appropriate
technical qualifications (expert personnel) or who have received the relevant training from Pfeiffer Vac-
uum.
About this manual
5/58

1.3 Conventions
1.3.1 Abbreviations
Abbreviation Meaning in this document
RSSR Radial shaft seal ring
3TF PTC positive temperature coefficient
PE Earthed conductor (protective earth)
Tbl. 1: Abbreviations used in this document
1.3.2 Pictographs
Pictographs used in the document indicate useful information.
Note
Tip
1.3.3 Product sticker
This section describes all the stickers on the product along with their meaning.
1
2D-35641 Asslar
Mod.: Hena 201
Mod.-Nr.: PK D03 400 A
Ser.- Nr.: 0014440
S : max. 200/240 m /h
Oil : P3 6.5 l
Mass : 182 kg
n : XXXX 1/min
(N )
2
3
max.
Made in Switzerland 2005/01
●Warning
Hot surface
●Sticker
Read the operating instruc-
tions before starting up the
pump.
●Rating plate
The rating plate is located
on the pump housing next
to the sight glass.
●Motor rating plate
The motor rating plate is
located on the motor (not
shown).
Tbl. 2: Product sticker
1.3.4 Symbols used
Vacuum connection
Exhaust connection
Gas ballast connection
Electrical connection
Tbl. 3: Symbols used in this document
About this manual
6/58

1.3.5 Instructions in the text
Usage instructions in the document follow a general structure that is complete in itself. The required ac-
tion is indicated by an individual step or multi-part action steps.
Individual action step
A horizontal, solid triangle indicates the only step in an action.
►This is an individual action step.
Sequence of multi-part action steps
The numerical list indicates an action with multiple necessary steps.
1. Step 1
2. Step 2
3. ...
About this manual
7/58

2 Safety
2.1 General safety instructions
This document includes the following four risk levels and one information level.
DANGER
Imminent danger
Indicates a hazardous situation which, if not avoided, will result in death or serious injury.
►Instructions on avoiding the hazardous situation
WARNING
Possibly imminent danger
Indicates a hazardous situation which, if not avoided, could result in death or serious injury.
►Instructions on avoiding the hazardous situation
CAUTION
Possibly imminent danger
Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
►Instructions on avoiding the hazardous situation
NOTICE
Danger of property damage
Notice is used to address practices not related to physical injury.
►Instructions on avoiding property damage
Notes, tips or examples indicate important information on the product or on this
document.
2.2 Safety instructions
All safety instructions in this document are based on the results of the risk assessment carried out in
accordance with Machinery Directive 2006/42/EC Annex I and DIN EN ISO 12100 Section 5. Where ap-
plicable, all life cycle phases of the product were taken into account.
Risks during transport
WARNING
Danger of serious injury from falling or swinging objects
Falling or swinging objects during transport pose a danger of injuries to limbs, up to and including
bone fractures.
►Prevent people from remaining below the suspended load.
►Secure the danger zone if necessary.
►Avoid diagonal pulling of the crane rope.
►Wear protective equipment, e.g. safety shoes.
Safety
8/58

Risks during installation
DANGER
Danger to life from electric shock
Contact with exposed and live elements generate an electric shock. Incorrect connection of the mains
supply leads to the risk of live housing parts that can be touched. There is a risk to life.
►Before the installation, check that the connection leads are voltage-free.
►Make sure that electrical installations are only carried out by qualified electricians.
►Provide adequate grounding for the device.
►After connection work, carry out an earthed conductor check.
CAUTION
Danger of injury from moving parts
After a power failure or a standstill as a result of overheating, the motor restarts automatically. There
is a risk of injury to fingers and hands if they enter the operating range of rotating parts.
►Safely disconnect motor from the mains.
►Secure the motor against reactivation.
►Dismantle the vacuum pump for inspection, away from the system if necessary.
Risks during operation
WARNING
Danger of poisoning due to emission of toxic process gases from the exhaust
During operation with no exhaust line, the vacuum pump allows exhaust gases and vapors to escape
freely into the air. In processes involving toxic media, there is a risk of injury and danger to life due to
poisoning.
►Observe the relevant regulations for handling toxic substances.
►Safely purge toxic process gases via an exhaust line.
►Use suitable filter equipment to separate toxic substances.
WARNING
Risk of burns from ejected hot oil mist
During operation, hot pressurized oil mist escapes from the operating fluid separator.
►Only operate the vacuum pump with the operating fluid filler screw securely fitted.
►Open the locking screws on the separator only while the vacuum pump is switched off.
CAUTION
Risk of injury from bursting due to high pressure in the exhaust line
Faulty or insufficient exhaust lines cause hazardous situations, e.g. increase in exhaust pressure.
There is a risk of bursting. It is not possible to rule out the risk of injuries due to broken pieces flying
around, high escaping pressure and damage to the equipment.
►Lay the exhaust line without shut-off units.
►Observe the permissible pressures and pressure differentials of the product.
►Check the exhaust line regularly for correct function.
CAUTION
Danger of burns on hot surfaces
Depending on the operating and ambient conditions, the surface temperature of the vacuum pump
can increase to above 70 °C.
►Provide suitable touch protection.
Safety
9/58

Risks during maintenance
WARNING
Danger to life from electric shock in the event of a fault
In the event of a fault, devices connected to the mains may be live. There is a danger to life from
electric shock when making contact with live components.
►Always keep the mains connection freely accessible so you can disconnect it at any time.
WARNING
Health hazard through poisoning from toxic contaminated components or devices
Toxic process media result in contamination of devices or parts of them. During maintenance work,
there is a risk to health from contact with these poisonous substances. Illegal disposal of toxic sub-
stances causes environmental damage.
►Take suitable safety precautions and prevent health hazards or environmental pollution by toxic
process media.
►Decontaminate affected parts before carrying out maintenance work.
►Wear protective equipment.
CAUTION
Scalding from hot operating fluid
Danger of burns when draining operating fluid in case of skin contact.
►Wear protective equipment.
►Use a suitable collection receptacle.
CAUTION
Danger of injury from moving parts
After a power failure or a standstill as a result of overheating, the motor restarts automatically. There
is a risk of injury to fingers and hands if they enter the operating range of rotating parts.
►Safely disconnect motor from the mains.
►Secure the motor against reactivation.
►Dismantle the vacuum pump for inspection, away from the system if necessary.
2.3 Safety precautions
Information requirement on possible hazards
The owner or operator of the product is required to make all operating personnel
aware of hazards arising from the use of this product.
Every person who is involved in the installation, operation or maintenance of the
product must have read and understood the safety-relevant parts of this documen-
tation.
Infringement of EU conformity due to modifications to the product
The Declaration of Conformity from the manufacturer is no longer valid if the opera-
tor changes the original product or installs additional equipment.
●Following installation into a system, the operator is required to check and re-
evaluate as necessary the conformity of the overall system in the context of the
relevant EU Directives before commissioning that system.
General safety precautions when handling the product
►Observe all applicable safety and accident prevention regulations.
►Check that all safety measures are observed at regular intervals.
►Do not expose body parts to the vacuum.
►Always ensure a secure connection to the earthed conductor (PE).
►Never disconnect plug connections during operation.
Safety
10/58

►Observe the above shutdown procedures.
►Keep lines and cables away from hot surfaces (> 70°C).
►Never fill or operate the unit with cleaning agents or cleaning agent residues.
►Do not carry out your own conversions or modifications on the unit.
►Observe the unit protection class prior to installation or operation in other environments.
►Provide suitable touch protection, if the surface temperature exceeds 70°C.
2.4 Product limits of use
Parameter Hena 201, Hena 251,
Hena 301
Hena 301 S
Ambient temperature +12 °C to +40 °C +12 °C to +40 °C
Pumped medium intake temperature, max. +80 °C +80 °C
Permissible operating pressure range during continuous
operation
< 800 hPa ≤ 100 hPa
Tbl. 4: Pump limits of use
2.5 Proper use
►Use the vacuum pump for vacuum generation only.
►Use standard operating fluid with ≤21% oxygen concentration only.
►Use application-specific operating fluid at higher oxygen concentrations only following consultation
with Pfeiffer Vacuum.
►Adhere to the installation, commissioning, operating, and maintenance instructions.
►Do not use any accessory parts other than those recommended by Pfeiffer Vacuum.
2.6 Foreseeable improper use
Improper use of the product invalidates all warranty and liability claims. Improper use is any, even unin-
tended, use, which is contrary to the product purpose; and in particular:
●Pumping of corrosive media
●Pumping of radioactive media
●Pumping of gases that introduce an ignition source to the suction chamber
●Pumping of gases that contain impurities such as particles, dust, or condensate
●Pumping explosive media
●Use of the vacuum pump in potentially explosive atmospheres
●Pumping of media with a propensity to sublimation
●Pumping of fluids
●Use of the vacuum pump outside the specified area of application
●Use for pressure generation
●Use in strong electrical, magnetic, or electromagnetic fields
●Connection to vacuum pumps or equipment which are not suitable for this purpose according to
their operating manual
●Connection to devices with exposed live parts
●Use of operating fluids other than those specified by Pfeiffer Vacuum
●Use of accessories or spare parts not listed in these instructions
Safety
11/58

3 Product description
3.1 Product identification
To ensure reliable identification of the product when communicating with Pfeiffer Vacuum, always keep
all of the information on the rating plate to hand.
2
D-35641 Asslar
Mod.: Hena 201
Mod.-Nr.: PK D03 400 A
Ser.- Nr.: 0014440
S : max. 200/240 m /h
Oil : P3 6.5 l
Mass : 182 kg
n : XXXX 1/min
(N )
2
3
max.
Made in Germany 2005/01
Fig. 1: Rating plate, Hena 201 | 251 | 301 | 301 S
The following information is shown on the rating plate:
●Pump model
●Model number
●Operating fluid type and quantity
●Date of manufacture
►You can obtain motor-specific data such as input voltage range from the separately attached mo-
tor rating plate.
3.2 Shipment
●Vacuum pump with motor
●Operating fluid
●Locking caps for vacuum and exhaust connection
●Operating instructions
3.3 Function
The rotary vane pumps of the HenaLine are single-stage, oil-sealed rotary displacement pumps with air
cooling and circulatory lubrication. A non-return valve in the intake flange closes the intake line automat-
ically when switching off the pump and prevents an operating fluid return flow. The integrated oil mist
filter cleans the conveyed gas and prevents the operating fluid mist from being emitted at the exhaust.
The operating fluid collected in the separator is supplied back to the pump. A filter is also installed for
cleaning the operating fluid.
The pump is intended for the evacuation of clean air or other non-aggressive, non-poisonous and non-
explosive gases. Pumping media with a higher density than air results in a higher thermal and mechani-
cal load on the vacuum pump and the drive, and is only permitted after prior consultation with Pfeiffer
Vacuum.
Product description
12/58

1
3
2
6
5
4
7
8
Fig. 2: Design Hena 201 | Hena 251 | Hena 301 | Hena 301 S
1 Vacuum flange 5 Operating fluid drain screw
2 Gas ballast valve 6 Sight glass
3 Exhaust flange 7 Operating fluid filter
4 Operating fluid filler screw (pressure gage, accessories) 8 Operating fluid separator
Air cooling (standard) The vacuum pump is cooled by heat radiation from its surface, the air flow of
the two fan impellers and by the pumped gas.
Oil/water heat exchanger (option) In case of thermally unfavorable ambient conditions, we recom-
mend the use of a pump version with oil/water heat exchanger.
3.3.1 Operating principle
Fig. 3: HenaLine operating principle
The rotary vane pump is an oil-sealed rotary positive displacement pump. The pumping system is made
up of the housing, the eccentrically mounted rotor, and the centrifugally sliding vanes, which divide the
suction chamber into multiple chambers. The volume of each chamber changes periodically as the rotor
rotates. This causes the gas to be continuously drawn in at the vacuum flange and compressed in the
suction chamber by the rotation of the rotor until the exhaust valve opens against the atmospheric pres-
sure and the gas leaves the suction chamber.
Gas ballast
The gas ballast device serves to add a limited amount of mixture of ambient air or inert gas to the proc-
ess gas in order to counteract the condensation from vapor contents. By increasing the air content in
the suction chamber, the opening pressure of the exhaust valve has already been reached before con-
densation forms in the expelled gas/vapor mixture. In doing so, the pump-specific limits of the water va-
Product description
13/58

por tolerance must be observed. The ultimate pressure achieved with the gas ballast is higher than op-
eration without gas ballast.
Operating fluid
The vacuum pump oil, also referred to as operating fluid, fulfills several functions in a rotary vane pump:
in addition to the lubrication of all moving parts, the operating fluid fills a part of the dead volume below
the exhaust valve, and seals the gap. In addition, the operating fluid supports cooling and, under the
aspect of corrosion protection and resistance, may also have to be selected for process suitability. From
the operating fluid reservoir, dosed operating fluid is supplied to the pump system and mixed with the
conveyed gas. In the downstream operating fluid separator, the operating fluid is separated from the ex-
haust air flow and thus retained in the rotary vane pump.
3.3.2 Operating fluid return via the float valve
The vacuum pumps are equipped with an operating fluid return as standard. If the operating fluid col-
lected in the operating fluid separator reaches a certain level, a float valve opens and the ejected oper-
ating fluid is returned to the intake port of the vacuum pump.
Function of the operating fluid return
The operating fluid return functions only at an operating pressure of < 800 hPa.
Product description
14/58

4 Transportation and Storage
4.1 Transport
WARNING
Danger of serious injury from falling or swinging objects
Falling or swinging objects during transport pose a danger of injuries to limbs, up to and including
bone fractures.
►Prevent people from remaining below the suspended load.
►Secure the danger zone if necessary.
►Avoid diagonal pulling of the crane rope.
►Wear protective equipment, e.g. safety shoes.
NOTICE
Equipment damage from operating fluid leaking into the pumping system.
When tipping the vacuum pump, the operating fluid will overflow into the pumping system, resulting in
the vane breaking when the pump is switched on.
►Always transport the vacuum pump horizontally or without operating fluid filling.
►Fill in the operating fluid only at the final installation location.
Pfeiffer Vacuum recommends keeping the transport packaging and original protec-
tive cover.
2
1
Fig. 4: Transporting the pump
1 Protective cap 2 Crane lug
In order to prevent dirt and foreign matter from entering the pump interior, it is important that the two
protective caps are kept on the connection flanges during transport.
1. Transport the packaged pump on a pallet. Where possible, use a fork lift.
2. Be mindful of transport damage.
3. Unpack the pump.
4. Loosen the screw connections on the transport container.
Transport without packaging
1. Lift the pump out of the transport packaging using the intended crane eyebolt.
2. Remove both protective caps from the vacuum and exhaust connections only immediately before
installation.
4.2 Storage
Pfeiffer Vacuum recommends storing the products in their original transport pack-
aging.
Transportation and Storage
15/58

Storing the vacuum pump
1. Close both connection flanges.
2. Make sure that the gas ballast valve is closed.
3. Store the vacuum pump only in dry, dust-free rooms, within the specified ambient conditions.
4. Hermetically shrink-wrap the vacuum pump together with a drying agent in a plastic bag in case of
damp or aggressive atmospheres.
5. Change the operating fluid if the storage period is longer than 2 years.
Transportation and Storage
16/58

5 Installation
5.1 Installing the vacuum pump
Installation location ●Indoors, protected from dust deposits
●Outdoors, protected from direct weather influences
Installation altitude max. 1000 m
Orientation horizontal, max. permissible angle of inclination: ±1°
Ambient temperature +12 °C to +40 °C
Relative air humidity max. 85%
Tbl. 5: Ambient conditions
> 200 mm
> 200 mm
> 200 mm
Fig. 5: Minimum clearances to side boundaries and permissible inclination
Notes on installing the pump
1. Fill with operating fluid prior to first commissioning.
–Quantity and type according to rating plate.
2. Place the pump on a flat, horizontal surface, to safeguard the operating fluid supply.
3. Screw the pump on the rubber-metal buffer to the mounting surface.
4. When installing the pump in a closed housing, ensure adequate air circulation.
5. Keep the sight glass and gas ballast valve visible and freely accessible.
6. Keep the voltage and frequency specifications on the motor rating plate visible and freely accessi-
ble.
5.2 Connecting the vacuum side
1. Remove the protective cap from the vacuum connection.
2. Use a pipe that is as short as possible, at least the nominal diameter of the vacuum connection.
3. Use a separator or filter if necessary to protect the pump against contamination.
4. Clean the connection threads.
5. For sealing, apply Loctite to the thread turns.
–Recommendation: Loctite 245 or Loctite 577.
6. Screw in the pipe.
7. Support the piping to the pump so that no piping system forces act on the pump.
As an alternative to the G 2" pipe connection, an adapter flange DN 63 ISO-K / G 2" is available (see
chapter “Accessories”, page 55).
Installation
17/58

5.3 Connecting the exhaust side
WARNING
Danger of poisoning due to emission of toxic process gases from the exhaust
During operation with no exhaust line, the vacuum pump allows exhaust gases and vapors to escape
freely into the air. In processes involving toxic media, there is a risk of injury and danger to life due to
poisoning.
►Observe the relevant regulations for handling toxic substances.
►Safely purge toxic process gases via an exhaust line.
►Use suitable filter equipment to separate toxic substances.
CAUTION
Danger of injury from bursting as a result of high pressure in the exhaust line
Faulty or short exhaust lines cause hazardous situations, e.g. exhaust pressure increase. There is a
danger of bursting. Injuries caused by flying fragments, the escaping of high pressure, and damage
to the unit cannot be excluded.
►Open shut-off units immediately before or at the same time as starting the pump.
►Take care that atmospheric pressure is always present on the exhaust side. Overpressure or un-
derpressure are not permissible!
►Check the function of the exhaust line on a regular basis.
Connecting the exhaust side
1. Remove the protective cap from the exhaust connection.
2. Choose a minimum exhaust line cross section equal to the nominal diameter of the exhaust con-
nection.
3. Route the piping downwards from the pump, to prevent condensate return.
4. Clean the connection threads.
5. For sealing, apply Loctite to the thread turns.
–Recommendation: Loctite 245 or Loctite 577.
6. Screw in the pipe.
7. Support the piping to the pump so that no piping system forces act on the pump.
As an alternative to the G 2" pipe connection, an adapter flange DN 63 ISO-K / G 2" is available (see
chapter “Accessories”, page 55).
Avoiding condensation backflow:
1. Install a condensate separator in the exhaust line if necessary.
2. Use the lowest exhaust line point for the condensate drain.
5.4 Establishing mains connection
DANGER
Danger to life from electric shock
Contact with exposed and live elements generate an electric shock. Incorrect connection of the mains
supply leads to the risk of live housing parts that can be touched. There is a risk to life.
►Before the installation, check that the connection leads are voltage-free.
►Make sure that electrical installations are only carried out by qualified electricians.
►Provide adequate grounding for the device.
►After connection work, carry out an earthed conductor check.
Installation
18/58

CAUTION
Danger of injury from moving parts
After a power failure or a standstill as a result of overheating, the motor restarts automatically. There
is a risk of injury to fingers and hands if they enter the operating range of rotating parts.
►Safely disconnect motor from the mains.
►Secure the motor against reactivation.
►Dismantle the vacuum pump for inspection, away from the system if necessary.
NOTICE
Risk of damage from excess voltage!
Incorrect or excessive mains voltage will destroy the motor.
►Always observe the motor rating plate specifications.
►Route the mains connection in accordance with locally applicable provisions.
►Always provide a suitable mains fuse to protect the motor and supply cable in the event of a fault.
–Pfeiffer Vacuum recommends the circuit breaker type "K" with slow tripping characteristic.
NOTICE
Risk of damage from high starting torque!
The specific load behavior of the vacuum pump requires a direct start-up.
►Always start the motor directly; do not use a star-delta starting circuit.
Depending on the pump type, different motor designs or mains voltages can be used:
●Three phase motor without switch and mains cable with 3TF
5.4.1 Three phase motor with 12-pin terminal board
This motor can be connected in 3 different circuit configurations:
►Observe the voltage on the motor rating plate in each case.
Double star circuit
U3 U2 U4
U1
V3 V2 V4 V1
V W3 W2 W4
W1
L1
L2
L3
Fig. 6: Multi-voltage motor (low voltage)
Delta connection
U3 U2 U4
U1
V3 V2 V4 V1
VW3 W2 W4
W1
L1
L2
L3
Fig. 7: Multi-voltage motor (medium voltage)
Star circuit
U3 U2 U4
U1
V3 V2 V4 V1
V W3 W2 W4
W1
L1
L2
L3
Installation
19/58

Fig. 8: Multi-voltage motor (high voltage)
5.4.2 Three phase motor with 6-pin terminal board
This motor can be connected in 2 different circuit configurations:
►Observe the voltage on the motor rating plate in each case.
Delta connection
W2
U1
U2 V2
V
V1 W1
L1 L2 L3
Fig. 9: Delta connection for low voltage
The 3 phases are connected in series and the connection points connected to the mains. The voltage
per phase is equal to the mains voltage, while the mains current is √3 times the phase current. The del-
ta connection is marked with the ∆ symbol. The voltage between the incoming mains supply lines is
called mains voltage. The mains current is the current flowing in the incoming supply lines.
Star circuit
V
L1 L2 L3
W2
U1
U2 V2
V1 W1
Fig. 10: Star circuit for high voltage
The ends of the 3 phases are connected in the star point. The terminal voltage is √3 times the phase
voltage, the mains current is equal to the phase current. The star circuit is marked with the Y symbol.
5.4.3 Checking the direction of rotation
NOTICE
Equipment damage from incorrect direction of rotation
The direction of rotation must be checked on vacuum pumps with three phase motors. If the vacuum
pump has an incorrect direction of rotation, damage may be caused to the pumping system after a
short time.
►Determine the intended direction of rotation based on the arrow sticker.
►Fill in the operating fluid only after that.
Checking the direction of rotation
1. Remove the protective cap from the exhaust flange.
2. Switch the vacuum pump on briefly (2 to 3 seconds)
–The motor and motor fan must rotate counter-clockwise (see the arrow on the fan cover).
3. If the direction of rotation is incorrect, swap the two phases on the connection cable.
4. Refill the operating fluid (see chapter “Refilling operating fluid”, page 22).
Installation
20/58