Edwards A373-30-940 User manual

A373-10-880
Issue R Original
Instruction Manual
E2M28 and E2M30 Rotary Vacuum Pumps
Description Item Number
E2M28, 100/200 V, 50 Hz or 100-105/200-210 V, 60 Hz, single-phase A373-15-904
E2M28, 115/230 V, 60 Hz, single-phase A373-15-981
E2M28, 200-240 V, 50 Hz, or 230-240 V, 60 Hz, single-phase A373-15-903
E2M28, 200-220/380-415 V, 50 Hz, or 200-230/460 V, 60 Hz, three-phase A373-30-940
E2M28, 200-240 V, 50 Hz, or 230-240 V, 60 Hz, single-phase (Amphenol) A373-16-903
E2M28, 110/200-240 V, 50 Hz, or 115-120/200-230 V, 60 Hz, single-phase A373-17-984
E2M28FF, 110/220-240 V, 50 Hz, or 115/200-230 V, 60 Hz, single-phase, (Fomblin) filled A373-25-984
E2M28-FF, 220/240 V, 50 Hz, or 230/240 V, 60 Hz, single-phase A373-25-903
E2M28-FF, 200-220/380-415 V, 50 Hz, or 200-230/460 V, 60 Hz, three-phase A373-41-940
E2M30, 100/200 V, 50 Hz or 100-105/200-210 V, 60 Hz, single-phase A374-15-904
E2M30, 115/230 V, 60 Hz, single-phase A374-15-981
E2M30, 200-240 V, 50 Hz, or 230-240 V, 60 Hz, single-phase A374-15-903

This product has been manufactured under a quality system registered to ISO9001
Declaration of Conformity
We, Edwards,
Manor Royal,
Crawley,
West Sussex, RH10 9LW, UK
declare under our sole responsibility, as manufacturer and person within the EU authorised to assemble
the technical file, that the product(s)
AXXX – YY – ZZZ
Pump Type Variant Motor Description
XXX YY ZZZ
373 = E2M28 10 to 99 903 = 220 V, 0.75 kW
374 = E2M30 904 = 100/200 V
930 = 220 V, 0.75 kW
940 = 200-230/380-460 V, 50/60 Hz, 3 phase
981 = 115/230 V, 60 Hz
984 = 110/200-240 V, 0.75 kW – switched to High volt
986 = 110/200-240 V, 0.75 kW – switched to Low volt
to which this declaration relates is in conformity with the following standard(s) or other normative
document(s)
EN ISO 12100-2: 2003Safety of Machinery. Basic Concepts, General Principles for
+ A1: 2009 Design. Technical Principals
EN1012-2:1996, A1: 2009 Compressors and Vacuum Pumps. Safety Requirements.
VacuumPumps
EN61010-1: 2001 * Safety Requirements for Electrical Equipment for Measurement,
Control and Laboratory Use. General Requirements
EN13463-1: 2009 Non-electrical equipment for use in potentially explosive
atmospheres. Basic method and requirements
EN13463-5: 2003 Non-electrical equipment for use in potentially explosive
atmospheres. Protection by constructional safety ‘c’
EN60034-1: 2004 Rotating electrical machines. Rating and performance
C22.2 No77: 1995 #Motors with inherent overheating protection
C22.2 No100: 2004 #Motors and Generators
C22.2 61010-1-04: 2004 Safety requirements for electrical equipment for measurement,
Control and laboratory use – Part 1: General requirements
UL61010A: 2002 Safety requirements for electrical equipment for measurement,
Control and laboratory use – Part 1: General requirements
UL1004: 1994#Electric Motors
* 1-phase pumps only. The pumps comply with EN 61010-1 when installed in accordance with
the instruction manual supplied with the pumps.
# 1-phase pumps only. Canadian Standards Authority and Underwriters Laboratory.
and fulfils all the relevant provisions of
2006/42/EC Machinery Directive
2006/95/EC Low Voltage Directive
2004/108/EC Electromagnetic Compatibility (EMC) Directive
94/9/EC ATEX Directive on use in Potentially Explosive Atmospheres
II 3 G c IIB T4 Internal atmospheres only – Tech File Ref: MPTR 0271
Note: This declaration covers all product serial numbers from the date this Declaration was signed
onwards.
Peter Meares, Technical Support Manager – Industrial & Chemical
Date and Place
Add ref number here e.g. P200-00-000 Issue A All new numbers should be logged in P-Numbers spreadsheet on Publicit in P-Numbers folder.
P200-00-620 Issue
E
9 December 2009

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Contents
A373-10-880 Issue R
Contents
Section Page
1 Introduction .......................................................................................1
1.1 Scope and definitions ................................................................................................... 1
1.2 ATEX directive implications ............................................................................................ 2
1.3 Description ................................................................................................................ 4
1.4 Gas-ballast ................................................................................................................ 4
2 Technical data ....................................................................................5
2.1 Operating and storage conditions ..................................................................................... 5
2.2 Performance .............................................................................................................. 5
2.3 Mechanical data .......................................................................................................... 6
2.4 Lubrication data ......................................................................................................... 6
2.5 Electrical data ............................................................................................................ 7
3 Installation .........................................................................................9
3.1 Safety ......................................................................................................................9
3.2 System design ............................................................................................................ 9
3.3 Unpack and inspect .....................................................................................................10
3.4 Locate the pump ........................................................................................................10
3.5 Fill the pump with oil ..................................................................................................11
3.6 Electrical installation: single-phase motors ........................................................................11
3.6.1 Introduction .............................................................................................................11
3.6.2 Standard single-phase motors ........................................................................................12
3.6.3 Amphenol version single-phase motors ..............................................................................12
3.6.4 110/200-240 V 50 Hz or 115-120/200-230 V 60 Hz single-phase motors .......................................12
3.7 Electrical installation: three-phase motors .........................................................................16
3.7.1 Connect the electrical supply to the motor ........................................................................16
3.7.2 Check the direction of rotation ......................................................................................17
3.8 Connect the pump inlet ................................................................................................17
3.9 Connect the pump outlet ..............................................................................................18
3.10 Gas-ballast inlet connection ..........................................................................................18
3.11 Leak test the system ...................................................................................................18
4 Operation ........................................................................................ 19
4.1 ATEX directive implications ...........................................................................................19
4.1.1 Introduction .............................................................................................................19
4.1.2 Flammable/pyrophoric materials ....................................................................................19
4.1.3 Gas purges ...............................................................................................................20
4.2 Gas-ballast control .....................................................................................................20
4.3 Start-up ..................................................................................................................21
4.4 To achieve ultimate vacuum ..........................................................................................21
4.5 To pump condensable vapours ........................................................................................22
4.6 To decontaminate the oil ..............................................................................................22
4.7 Unattended operation ..................................................................................................22
4.8 Shut-down ................................................................................................................22
5 Maintenance ..................................................................................... 23
5.1 Safety information ......................................................................................................23
5.2 Maintenance plan .......................................................................................................23
5.3 Check the oil-level .....................................................................................................24
5.4 Replace the oil ..........................................................................................................24
gea/0183/02/12

A373-10-880 Issue R
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Contents
5.5 Inspect and clean the inlet-filter .....................................................................................25
5.6 Clean the gas-ballast filter ............................................................................................26
5.7 Clean the motor fan-cover and enclosure ..........................................................................26
5.8 Clean and overhaul the pump .........................................................................................26
5.9 Replace the run capacitor and test the motor .....................................................................27
5.10 Fit new blades ...........................................................................................................27
5.11 Fault finding .............................................................................................................27
5.11.1 Introduction .............................................................................................................27
5.11.2 The pump has failed to start ..........................................................................................27
5.11.3 The pump fail to achieve specified performance (failure to reach ultimate vacuum) ......................28
5.11.4 The pump is noisy .......................................................................................................28
5.11.5 The pump surface temperature is above 100°C ...................................................................28
5.11.6 The vacuum is not maintained after the pump is switched off ..................................................29
5.11.7 The pumping speed is poor ............................................................................................29
5.11.8 There is an external oil leak ..........................................................................................29
6 Storage and disposal ........................................................................... 31
6.1 Storage ...................................................................................................................31
6.2 Disposal ...................................................................................................................31
7 Service, spares and accessories .............................................................. 33
7.1 Introduction .............................................................................................................33
7.2 Service ....................................................................................................................33
7.3 Spares .....................................................................................................................33
7.4 Capacitor selection table ..............................................................................................34
7.5 Accessories ...............................................................................................................35
7.5.1 Introduction .............................................................................................................35
7.5.2 Inlet catchpot ...........................................................................................................35
7.5.3 Inlet dust filter ..........................................................................................................35
7.5.4 Inlet desiccant trap .....................................................................................................35
7.5.5 Inlet chemical trap .....................................................................................................35
7.5.6 Outlet mist filter ........................................................................................................35
7.5.7 Solenoid operated pipeline valve ....................................................................................37
7.5.8 Foreline trap .............................................................................................................37
7.5.9 Vibration isolators ......................................................................................................37
7.5.10 Oil drain extension .....................................................................................................37
7.5.11 Pump inlet adaptor .....................................................................................................37
7.5.12 Flexible bellows .........................................................................................................37
7.5.13 Pump outlet adaptor ...................................................................................................37
7.5.14 Gas ballast banjo/elbow assembly ...................................................................................37
7.5.15 Gas ballast valve ........................................................................................................37
8 PFPE-prepared EM pumps ..................................................................... 39
8.1 Introduction .............................................................................................................39
8.2 Installation ...............................................................................................................39
8.3 Operation ................................................................................................................39
8.4 Maintenance .............................................................................................................39
For return of equipment, complete the HS Forms at the end of this manual.

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Contents
A373-10-880 Issue R
Illustrations
Figure Page
1 The E2M28/E2M30 pump ................................................................................................ 3
2 Dimensions (mm) ........................................................................................................ 8
3 Electrical supply connection: single-phase motors: 220-240 V 50 Hz and 230-240 V 60 Hz .................13
4 Electrical supply connection: single-phase motors: 100 V 50 Hz, 100-105 V 60 Hz and 115 V 60 Hz ......13
5 Electrical supply connection, single-phase motors: 200 V 50 Hz, 200-210 V 60 Hz and 230 V 60 Hz ......14
6 Electrical supply connection, single-phase motors with Amphenol connector:
220-240 V 50 Hz and 230-240 V 60 Hz ...............................................................................15
7 Motor voltage selection: single-phase motors, 110/200-240 V 50 Hz and 115-120/200-240 V 60 Hz ......16
8 Remove/replace the inlet filter ......................................................................................25
9 Remove/replace the gas-ballast filter ..............................................................................26
10 Accessories ...............................................................................................................36
Tables
Table Page
1 Operating and storage conditions ..................................................................................... 5
2 Performance data ........................................................................................................ 5
3 Mechanical data .......................................................................................................... 6
4 Lubrication data ......................................................................................................... 6
5 Electrical data: three-phase motors .................................................................................. 7
6 Electrical data: single-phase motors ................................................................................. 7
7 Checklist of items .......................................................................................................10
8 Motor connection details ..............................................................................................11
9 Maintenance plan .......................................................................................................24
10 Spares item numbers ...................................................................................................33
11 Capacitor kits ............................................................................................................34
12 Capacitor kit selection table ..........................................................................................34
13 Accessory item numbers ...............................................................................................35
Associated publications
Publication title Publication number
Vacuum pump and vacuum system safety P300-20-000
Vibration isolators A248-01-880
EMF3, EMF10 and EMF20 oil mist filters A462-26-880

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A373-10-880 Issue R
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Edwards and the Edwards logo are trademarks of Edwards Limited.

© Edwards Limited 2012. All rights reserved. Page 1
Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
A373-10-880 Issue R
1Introduction
1.1 Scope and definitions
This manual provides installation, operation and maintenance instructions for the Edwards E2M28 and E2M30 rotary
vacuum pumps. You must use the pump as specified in this manual.
Read this manual before you install and operate the pump. Important safety information is highlighted as WARNING
and CAUTION instructions; you must obey these instructions. The use of WARNINGS and CAUTIONS is defined below.
CAUTION
Cautions are given where failure to observe the instruction could result in damage to the equipment, associated
equipment and process.
The units used throughout this manual conform to the SI international system of units of measurement.
The following warning labels are on the pump:
WARNING
Warnings are given where failure to observe the instruction could result in injury or death to
people.
Warning - refer to accompanying documentation.
Warning - risk of electric shock.
Warning - hot surfaces.
Warning - do not block the pump outlet.

A373-10-880 Issue R
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Introduction
1.2 ATEX directive implications
This equipment is designed to meet the requirements of Group II Category 3 equipment in accordance with
Directive 94/9/EC of the European Parliament and the Council of 23rd March 1994 on the approximation of
the laws of the Member States concerning equipment and protective systems intended for use in potentially
explosive atmospheres. (The ATEX Directive).
The ATEX Category 3 applies in respect of potential ignition sources internal to the equipment. An
ATEX Category has not been assigned in respect of potential ignition sources on the outside of the equipment
as the equipment has not been designed for use where there is an external potentially explosive atmosphere.
There is no potential source of ignition within the pump during normal operation but there may be potential
sources of ignition under conditions of predictable and rare malfunction as defined in the Directive.
Accordingly, although the pump is designed to pump flammable materials and mixtures, operating
procedures should ensure that under all normal and reasonably predictable conditions, these materials and
mixtures are not within explosive limits. Category 3 is considered appropriate for the avoidance of ignition in
the case of a rare malfunction which allows flammable materials or mixtures to pass through the pump while
within their explosive limits.
When flammable or pyrophoric materials are present within the equipment you must:
Not allow air to enter the equipment.
Ensure that the system is leak tight.
For further information, please contact Edwards: refer to the Addresses page at the end of this manual for
details of your nearest Edwards company.

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Introduction
A373-10-880 Issue R
Figure 1 - The E2M28/E2M30 pump
Notes: 1. A pump with a single-phase motor is shown in this figure.
2. The motor shown in this figure is not representative of the motor used on the E2M28 (Amphenol) pump
with Item Number A373-17-984. On this pump, items 7 and 9 are transposed, with Item 7 being an
IEC60320 16-20 Amp socket.
1. Oil filler
2. Outlet nozzle
3. Gas-ballast control
4. Gas-ballast inlet
5. Centring-ring and O-ring (supplied)
6. Inlet-port (adaptor flange)
7. Cable-gland/Amphenol connector position
8. Motor terminal box
9. On/Off switch
10.Box section skids
11.Oil drain-plug (gravity drain)
12.Oil sight-glass
13.Pump identification label
14.Oil drip tray

A373-10-880 Issue R
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Introduction
1.3 Description
The Edwards E2M28 and E2M30 pumps are shown in Figure 1. Refer to Figure 1 for item numbers in brackets in the
following descriptions.
The E2M28 and E2M30 pumps are two-stage, direct drive, sliding vane pumps. The pump is oil-sealed and designed
for reliable, long-term operation in both laboratory and industrial environments. The pump is a free-standing unit.
The drive is provided through a flexible coupling by a single-phase or three-phase (four pole) motor.
The motors are totally enclosed and are cooled by the motor-cooling fan which directs air along the motor fins.
The single-phase motors have a thermal overload device. When the motor is too hot, the thermal overload device
switches off the pump. The thermal overload device has an automatic reset; when the motor cools down, the device
resets and the motor will restart. The single phase motors have an on/off switch.
An oil pressure system lubricates the pump shaft bearing surfaces and rotor sealing faces. The pump has an oil
distribution valve which prevents discharge of oil to the pump interior (suckback) after the pump stops. The pumping
chambers are air-tight, so this arrangement prevents air suckback unless the gas-ballast valveis open. For protection
in this case, refer to Section 1.4.
You can inspect the level and condition of oil in the oil box reservoir through the oil sight-glass (12). An oil filler-plug
(1) is fitted to the top of the oil box. The pump has an oil drain-plug (11) to allow gravity oil drain.
The pump has an inlet-port (6), outlet nozzle (2) and gas-ballast control (3). The pump is mounted on two mild steel
box section skids (10) on rubber pads. Details of suitable vibration isolators and other recommended accessories are
given in Section 7.5.
1.4 Gas-ballast
To pump high vapour loads, gas-ballast is delivered into the pump to prevent condensation of the vapour carried by
the pumped gases.
Air (or another gas) can be introduced into the low vacuum stage through the gas-ballast control. The gas-ballast
control is a multi-turn valve which you can adjust, as required, between closed and fully open.

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Technical data
A373-10-880 Issue R
2Technicaldata
2.1 Operating and storage conditions
Note: To comply with CSA standards, the pump must be installed and used indoors, and within the operating
conditions specified in Table 1 below.
2.2 Performance
Note: Where total pressures are shown in Table 2 below, measurements were taken using an untrapped total
pressure capacitance diaphragm gauge on a header, as specified by Pneurop standards.
Table 1 - Operating and storage conditions
Parameter Reference Data
Ambient temperature range (operation) 13 to 40 °C
Ambient temperature range (storage) -30 to 70 °C
Normal surface temperature of the pump-body*
*At ultimate vacuum, with ambient temperature of 20 °C.
45 to 65 °C
Maximum humidity (operation) 90 % RH
Maximum altitude (operation) 2000 m
Pollution degree 2
Installation category II
Noise level at 1 metre 57 dB(A) (at 50 Hz)
Vibration severity†
†Measured at the inlet port to ISO 2372 (1974)
Class 1C
Table 2 - Performance data
Maximum displacement E2M28 E2M30
50 Hz electrical supply 32.2 m3h-1 19 cfm
60 Hz electrical supply 38.9 m3h-1 23 cfm
Maximum pumping speed - Pneurop
50 Hz electrical supply 27.5 m3h-1 16.2 cfm
60 Hz electrical supply 33.0 m3h-1 19.4 cfm
Motor rotational speed
50 Hz electrical supply 1440 r min-1 1440 r min-1
60 Hz electrical supply 1720 r min-1 1720 r min-1
Ultimate vacuum
without gas-ballast (partial pressure) 1 x 10-4 mbar
1 x 10-2 Pa 7 x 10-5 torr
without gas-ballast (total pressure) 1 x 10-3 mbar
1 x 10-1 Pa 7 x 10-4 torr
with full gas-ballast (partial pressure) 2 x 10-1 mbar
2 x 101Pa 1.5 x 10-1 torr
Maximum water vapour inlet pressure 30 mbar
3 x 103Pa 22.5 torr

A373-10-880 Issue R
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Technical data
2.3 Mechanical data
2.4 Lubrication data
Note: A Edwards Material Safety Data Sheet for the oils specified below is available on request.
Maximum water vapour pumping rate 0.7 kg h-1 0.7 kg h-1
Maximum permitted outlet pressure (for full pump throughout) 0.5 bar gauge
1.5 bar absolute
1.5 x 105Pa
0.5 bar gauge
1.5 bar absolute
1.5 x 105Pa
Table 3 - Mechanical data
Parameter Reference Data
Approximate pump mass 44 kg
Dimensions Refer to Figure 2
Degree of protection
Single-phase motors IP44
Three-phase motors IP54
Pump inlet port NW25 (the flange can be removed from the 1 inch BSP threaded hole)
Pump outlet port 15 mm external diameter nozzle (the nozzle can be removed from the 3/4 inch BSP
threaded hole)
Table 4 - Lubrication data
Hydrocarbon pumps:
Recommended oil*
*To operate the pump when the ambient temperature is outside the range specified in Section 2.1, or to
optimise pump performance when you process condensible vapours, you may need a different oil.
Ultragrade 19
Maximum oil capacity 1.32 litres
PFPE - prepared EM pumps:
Recommended oil*Krytox 1506 or Fomblin 06/6
Maximum oil capacity 1.32 litres
Table 2 - Performance data (continued)
Maximum displacement E2M28 E2M30

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Technical data
A373-10-880 Issue R
2.5 Electrical data
Refer to Table 5 and 6. For motor current information please refer to the motor rating plate. The motor start-up
current is drawn for less than one second, so you must use slow-blow fuses to prevent unnecessary fuse failure when
the pump starts. Fuses should be to EN60269 Section 2.2. For conformance with CSA standards only, CSA certified
fuses are to be used. If you use the pump at temperatures lower than 13 °C, the start-up current will be drawn for
longer; this may cause the motor thermal overload device to open.
Table 5 - Electrical data: three-phase motors
Pump Item Number Voltage (V) Frequency (Hz)
A373-30-940,
A373-41-940 200-220 50
380-415 50
200-230 60
460 60
Motor output rating (continuous)
50 Hz operation 0.75 kW
60 Hz operation 0.90 kW
Table 6 - Electrical data: single-phase motors
Pump Item Number Voltage (V) Frequency (Hz)
A373-15-903,
A373-16-903, A374-15-903 220-240 50
230-240 60
A373-15-981, A374-15-981 115 60
230 60
A373-15-904, A374-15-904 100 50
100-105 60
200 50
200-210 60
A373-17-984, A373-25-984 110 50
115-120 60
200-240 50
200-230 60
Motor output rating (continuous)
50 Hz operation 0.75 kW
60 Hz operation 0.90 kW

A373-10-880 Issue R
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Technical data
Figure 2 - Dimensions (mm)
1. Top view of pump with single-phase motor
2. Side view of pump with single-phase motor
3. Side view of pump with three-phase motor
4. Front view of pump with single-phase motor
Pump Item Number Dimension (mm)
Single-phase motors AB
A373-15-903, A373-16-903, A374-15-903 - 251
A373-15-981, A374-15-981 598 251
A373-15-904, A374-15-904 598 251
A373-17-984, A373-25-984 - 251
Three-phase motors
A373-30-940, A373-41-940 - 217

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Installation
A373-10-880 Issue R
3 Installation
3.1 Safety
A suitably trained and supervised technician must install the pump.
Wear the appropriate safety-clothing when you come into contact with contaminated components.
Vent and purge your vacuum system before you start installation work.
Ensure that the installation technician is familiar with the safety procedures which relate to the pump-oil
and the products processed by the pumping system. Take suitable precautions to avoid the inhalation of oil
mist and excessive skin contact with pump -oil, as prolonged exposure can be harmful.
Disconnect the other components in the pumping system from the electrical supply so that they cannot be
operated accidentally.
Safely route any electrical supply cables so that they cannot accidentally trip people.
You must ensure that the E2M28 or E2M30 pump is suitable for your application. If you have any doubts as to
the suitability of the pump for your application, refer to the Edwards guidelines on vacuum pump and
vacuum system safety (refer to the Associated Publication at the end of the contents list at the front of this
manual).
3.2 System design
Consider the following points when you design your pumping system:
Use a suitable inlet-valve to isolate the pump from your vacuum system if you need to allow the pump to
warm up before you pump condensable vapours, or if you need to maintain vacuum when the pump is
switched off.
Avoid high levels of heat input to the pump from the process gases, otherwise the pump may overheat and
seize, and cause the motor thermal overload device to open.
If you use the pump in a high ambient temperature and have a high gas throughput, the temperature of the
pump-body may exceed 70 °C and you must fit suitable guards to prevent contact with hot surfaces.
Make sure that the exhaust pipeline cannot become blocked. If you have an outlet-isolation valve, make sure
that you cannot operate the pump with the valve closed.
WARNING
If you use a hydrocarbon oil in this pump, you must not use the pump to process oxygen in
concentrations greater than 25 % in volume. If you do, there is a risk of fire or explosion in the
oil-box of the pump.
WARNING
You must not use the E2M28 or E2M30 pump to pump hazardous substances.
WARNING
Obey the safety instructions listed below and take note of appropriate precautions. If you do not,
you can cause injury to people and damage to equipment.

A373-10-880 Issue R
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Installation
Provide for a purge of inert gas when you shut down the pumping system, to dilute dangerous gases to safe
concentrations. A suitable gas-ballast control valve for introduction of purge gas into the pump is available
as an accessory (refer to Section 7.5.15).
3.3 Unpack and inspect
1. Remove all packing materials and protective covers and check the pump. If the pump is damaged, notify your
supplier and the carrier in writing within three days; state the Item Number of the pump together with your
order number and your supplier's invoice number. Retain all packing materials for inspection. Do not use the
pump if it is damaged.
2. Check that your package contains the items listed in Table 7. If any of these items are missing, notify your
supplier within 3 days.
If the pump is not to be used immediately, replace the protective covers. Store the pump in suitable conditions, as
described in Section 6.1.
3.4 Locate the pump
The pump can be either free-standing on its box section skids, or be fixed by bolts through the four fixing holes in
the box section skids, or be used with vibration isolators. For the locations of the fixing holes in the box section skids,
refer to Figure 2.
Provide a firm, level platform for the pump. Locate the pump so that the oil-level sight-glass is visible and the oil
filler-plug, oil drain-plugs and gas -ballast control are accessible.
If your pump will be located inside an enclosure, make sure that there is adequate ventilation at both ends of the
pump, so that the ambient temperature around the pump does not exceed 40 °C. There must be a minimum space
of 25 mm between the pump and the enclosure walls.
Table 7 - Checklist of items
Quantity Description Check ()
1 E2M28 or E2M30 rotary vacuum pump 
(1) Fitting pack containing the following:
1 NW25 centring-ring 
1 O-ring for centring-ring 
1 Receptacle connectors*
*Various sizes: supplied with single-phase motors except for pumps with Item Numbers A373-16-903,
A373-17-984 and A373-25-984.

WARNING
Use suitable lifting equipment to move the pump. If you do not, you can injure yourself or damage
the pump. Refer to Section 2.3 for the mass of the pump.

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Installation
A373-10-880 Issue R
3.5 Fill the pump with oil
Fill the pump with oil as described below. Refer to Figure 1 for the item numbers in brackets.
1. Remove the oil filler-plug (1).
2. Pour oil into the pump until the oil-level reaches the MAX mark on the bezel at the top of the oil sight-glass (12).
If the oil-level goes above the MAX mark, remove the oil drain-plug (11) and drain the excess oil from the pump.
3. After a few minutes, recheck the oil-level. If the oil-level is now below the MAX mark, pour more oil into the
pump.
4. Refit the oil filler-plug. Tighten the plug firmly by hand. Do not overtighten.
3.6 Electrical installation: single-phase motors
CAUTION
Ensure that the motor is correctly configured for your electrical supply voltage and frequency. If you do not,
you can damage the motor.
3.6.1 Introduction
Note: The pump will restart automatically when the electrical supply is restored after an interruption and when
the pump cools after it has overheated. If you do not want the pump to restart automatically, use electrical
control equipment which must be reset manually.
Ensure that your electrical supply voltage corresponds with the voltage specified on the motor data plate.
We recommend that you connect the electrical supply to the motor through a starter or circuit breaker which has
thermal over-current protection which can be adjusted to suit the full-load current ratings shown on the motor rating
plate. The fuse ratings must be calculated by a qualified electrician. The supplier of your thermal over-current
protection device may specify fuse ratings to ensure correct operation of the over-current protection device. Ensure
that the fuse you use is suitable for the starting currents given on the motor rating plate.
The diameter of the outer sheath of the electrical supply cable must be within the range 7 to 10.5 mm. The cable
must conform in size and colour coding with your local and national electrical installation regulations. The
temperature rating of the cable must be 70 °C or greater.
WARNING
Ensure that the electrical installation of the pump conforms with your local and national safety
requirements. It must be connected to a suitably fused and protected electrical supply and a
suitable earth (ground) point.
Table 8 - Motor connection details
Pump Item Number Voltage (V) Frequency (Hz) Connection details:
refer to Figure
A373-16-903 (all) 50/60 6
A373-15-903, A374-15-903 (all) 50/60 3
A373-15-981, A374-15-981 115 60 4
230 60 5
A373-15-904, A374-15-904 100 50 4
100-105 60 4
200 50 5
200-210 60 5
A373-17-984, A373-25-984 (all) 50/60 7

A373-10-880 Issue R
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Installation
3.6.2 Standard single-phase motors
1. Remove the cover from the motor terminal box (Figure 1, item 8).
2. Remove the cable-gland from the inside of the terminal-box and fit the cable-gland to the cable leadthrough
hole in the side of the terminal-box.
3. Pass the electrical supply cable through the gland.
4. Remove the receptacle connectors from the fitting pack.
5. Fit a ring connector to the earth (ground) wire.
6. Select the correct size of receptacle connectors for your cable wires:
Use the red connectors for wire sizes 0.75 to 1.5 mm2.
Use the blue connectors for wire sizes 1. 5 to 2.5 mm2.
7. Attach the appropriate connector to the live and neutral wires.
8. Connect the electrical supply cable to the appropriate terminals as shown in Figure 3 to 5. You must tighten the
earth (ground) terminal connection to a torque of 2.13 to 2.87 Nm.
9. Tighten the dome shaped nut on the cable-gland until the outer sheath of the cable is firmly gripped. Do not
overtighten.
10.Check that the cable connections are correct, then refit the cover on the motor terminal-box.
3.6.3 Amphenol version single-phase motors
When you select the mating half of the amphenol connector, please ensure that it is compatible.
For conformance with CSA standards, only CSA certified connectors are to be used; the protective earth (ground)
connection is required to make first and break last with respect to the other connections.
Connect the electrical supply cable to the appropriate pins as shown in Figure 6.
3.6.4 110/200-240 V 50 Hz or 115-120/200-230 V 60 Hz single-phase motors
The motor is designed for a single-phase electrical supply and is suitable for 50 Hz and 60 Hz operation. The motor
can be manually switched between nominal supply voltages of 110-120 V and 200-240 V.
Use the following procedure to check that the voltage selector switch is correctly positioned for your electrical supply
voltage:
1. Refer to Figure 7. Undo the three screws securing the terminal box cover (1) and remove the cover.
2. Check the position of the voltage selector switch (6). If the switch is in the correct position, continue at Step 3.
If the voltage selector switch (6) is in the wrong position, press the switch to select the alternative position.
3. Refit the terminal box cover and secure with the three screws.
When you select the mating half of the connector, please ensure that it is compatible (IEC60320 C19 female). For
compliance with CSA standards, only CSA certified connectors are to be used.

© Edwards Limited 2012. All rights reserved. Page 13
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
A373-10-880 Issue R
Figure 3 - Electrical supply connection: single-phase motors: 220-240 V 50 Hz and 230-240 V 60 Hz
Figure 4 - Electrical supply connection: single-phase motors: 100 V 50 Hz, 100-105 V 60 Hz and 115 V 60 Hz
Wire colour codes:
BN Brown VT Violet
GY Grey WH White
OR Orange

A373-10-880 Issue R
Page 14 © Edwards Limited 2012. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
Figure 5 - Electrical supply connection, single-phase motors: 200 V 50 Hz, 200-210 V 60 Hz and 230 V 60 Hz
Wire colour codes:
BN Brown VT Violet
GY Grey WH White
OR Orange