Edwards E2M28 User manual

A373-10-880
Issue T
Original Instructions
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, 380/400 V, 50 Hz, or 230/460 V, 60 Hz, three-phase A373-33-940
E2M28, 200 V 50/60 Hz, or 380 V, 60 Hz, three-phase A373-33-934
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
E2M28-FF, 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, 380/400 V, 50 Hz, or 230/460 V, 60 Hz, three-phase A373-43-940
E2M28-FF, 200 V, 50/60 Hz, or 380 V, 60 Hz, three-phase A373-43-934
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

Document Template: 02B01010 Attachment 4 Iss. 1
Declaration of Conformity
We, Edwards,
Innovation Drive,
Burgess Hill,
West Sussex,
RH15 9TW, 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
X 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
934 = 200 V, 50/60 Hz, 380 V, 60 Hz, 3 phase
940 = 380/400 V, 50 Hz, 230/460 V, 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)
EN1012-2:1996+A1:2009 Compressors and Vacuum Pumps. Safety Requirements. Vacuum Pumps
EN61010-1: 2010* Safety Requirements for Electrical Equipment for Measurement, Control
and Laboratory Use. General Requirements
EN60034-1: 2010 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
EN50581: 2012 Technical Documentation for the Assessment of Electrical and Electronic
Products with respect to the Restriction of Hazardous Substances
* 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
2014/35/EU Low Voltage Directive
2011/65/EU Restriction of Certain Hazardous Substances (RoHS) Directive
Note: This declaration covers all product serial numbers from the date this Declaration was signed
onwards.
16.05.2016, Burgess Hill
Mr Peter Meares
Senior Technical Support Manager, General Vacuum Date
and Place
P200-00-620 Issue J
This product has been manufactured under a quality management system certified to ISO 9001:2008

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Contents
A373-10-880 Issue T
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 ...................................................................................................19
4 Operation ........................................................................................ 21
4.1 ATEX directive implications ...........................................................................................21
4.1.1 Introduction ............................................................................................................. 21
4.1.2 Flammable/pyrophoric materials ....................................................................................21
4.1.3 Gas purges ............................................................................................................... 22
4.2 Gas-ballast control .....................................................................................................22
4.3 Start-up ..................................................................................................................23
4.4 To achieve ultimate vacuum ..........................................................................................23
4.5 To pump condensable vapours ........................................................................................24
4.6 To decontaminate the oil ..............................................................................................24
4.7 Unattended operation ..................................................................................................24
4.8 Shut-down ................................................................................................................24
5 Maintenance ..................................................................................... 25
5.1 Safety information ......................................................................................................25
5.2 Maintenance plan .......................................................................................................25
5.3 Check the oil-level .....................................................................................................26
5.4 Replace the oil ..........................................................................................................26
gp/0256/10/14

A373-10-880 Issue T
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Contents
5.5 Inspect and clean the inlet-filter .....................................................................................27
5.6 Clean the gas-ballast filter ............................................................................................28
5.7 Clean the motor fan-cover and enclosure ..........................................................................28
5.8 Clean and overhaul the pump .........................................................................................28
5.9 Replace the run capacitor and test the motor .....................................................................29
5.10 Fit new blades ...........................................................................................................29
5.11 Fault finding ............................................................................................................. 29
5.11.1 Introduction .............................................................................................................29
5.11.2 The pump has failed to start ..........................................................................................29
5.11.3 The pump failed to achieve specified performance (failure to reach ultimate vacuum) ...................30
5.11.4 The pump is noisy ....................................................................................................... 30
5.11.5 The pump surface temperature is above 100°C ...................................................................30
5.11.6 The vacuum is not maintained after the pump is switched off ..................................................31
5.11.7 The pumping speed is poor ............................................................................................31
5.11.8 There is an external oil leak .......................................................................................... 31
6 Storage and disposal ........................................................................... 33
6.1 Storage ...................................................................................................................33
6.2 Disposal ................................................................................................................... 33
7 Service, spares and accessories .............................................................. 35
7.1 Introduction .............................................................................................................35
7.2 Service .................................................................................................................... 35
7.3 Spares ..................................................................................................................... 35
7.4 Capacitor selection table ..............................................................................................36
7.5 Accessories ...............................................................................................................37
7.5.1 Introduction ............................................................................................................. 37
7.5.2 Inlet catchpot ........................................................................................................... 37
7.5.3 Inlet dust filter .......................................................................................................... 37
7.5.4 Inlet desiccant trap ..................................................................................................... 37
7.5.5 Inlet chemical trap .....................................................................................................37
7.5.6 Outlet mist filter ........................................................................................................37
7.5.7 Solenoid operated pipeline valve ....................................................................................39
7.5.8 Foreline trap .............................................................................................................39
7.5.9 Vibration isolators ...................................................................................................... 39
7.5.10 Oil drain extension .....................................................................................................39
7.5.11 Pump inlet adaptor .....................................................................................................39
7.5.12 Flexible bellows .........................................................................................................39
7.5.13 Pump outlet adaptor ...................................................................................................39
7.5.14 Gas ballast banjo/elbow assembly ...................................................................................39
7.5.15 Gas ballast valve ........................................................................................................39
8 PFPE-prepared EM pumps ..................................................................... 41
8.1 Introduction .............................................................................................................41
8.2 Installation ............................................................................................................... 41
8.3 Operation ................................................................................................................41
8.4 Maintenance .............................................................................................................41
For return of equipment, complete the HS Forms at the end of this manual.

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Contents
A373-10-880 Issue T
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 ......................................................................................27
9 Remove/replace the gas-ballast filter ..............................................................................28
10 Accessories ...............................................................................................................38
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 .......................................................................................................26
10 Spares item numbers ...................................................................................................35
11 Capacitor kits ............................................................................................................36
12 Capacitor kit selection table ..........................................................................................36
13 Accessory item numbers ...............................................................................................37
Associated publications
Publication title Publication number
Vacuum pump and vacuum system safety P400-40-100
Vibration isolators A248-01-880
EMF3, EMF10 and EMF20 oil mist filters A462-26-880

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

© Edwards Limited 2014. All rights reserved. Page 1
Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
A373-10-880 Issue T
1Introduction
1.1 Scope and definitions
This manual provides installation, operation and maintenance instructions for the Edwards E2M28 and E2M30 rotary
vacuum pumps. The pump must be used as specified in this manual. Read this manual before installing and operating
the pump.
Important safety information is highlighted as WARNING and CAUTION instructions that must be followed. 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 T
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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:
Do 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 the nearest Edwards company.

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Introduction
A373-10-880 Issue T
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 T
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Edwards and the Edwards logo are trademarks of Edwards Limited.
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 valve is open. For protection
in this case, refer to Section 1.4.
The level and condition of oil in the oil box reservoir can be inspected 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 can be adjusted, as required, between closed and fully open.

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Technical data
A373-10-880 Issue T
2Technicaldata
2.1 Operating and storage conditions
Note: To comply with EN 61010 and 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
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 T
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Technical data
2.3 Mechanical data
2.4 Lubrication data
Note: Edwards Material Safety Data Sheets for the oils specified below are 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 processing condensable vapours, a different oil may be used.
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)
E2M28 E2M30

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Technical data
A373-10-880 Issue T
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 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 the pump is used 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)
A373-33-940 380/400 and 230/460 50/60
A373-33-934 200 and 200/380 50/60
A373-43-940 380/400 and 230/460 50/60
A373-43-934 200 and 200/380 50/60
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
A 3 7 3 - 1 7 - 9 8 4 , A 3 7 3 - 2 5 - 9 8 4 1 1 0 5 0
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 T
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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
A373-33-940, A373-33-934, A373-43-940,
A373-43-934
-229

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Installation
A373-10-880 Issue T
3 Installation
3.1 Safety
A suitably trained and supervised technician must install the pump.
Wear the appropriate safety-clothing when coming into contact with contaminated components.
Vent and purge the vacuum system before starting installation work.
Ensure that the installation technician is familiar with the safety procedures that 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.
Ensure that the E2M28 or E2M30 pump is suitable for the application. If there is any doubt as to the
suitability of the pump for the 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 designing the pumping system:
Use a suitable inlet-valve to isolate the pump from the vacuum system to allow the pump to warm up before
pumping condensable vapours, or 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 the pump is used in a high ambient temperature and has a high gas throughput, the temperature of the
pump-body may exceed 70°C. Fit suitable guards to prevent contact with hot surfaces.
Make sure that the exhaust pipeline cannot become blocked. If an outlet-isolation valve is fitted, make sure
the pump cannot be operated with the valve closed.
WARNING
If a hydrocarbon oil is used in this pump, do not use the pump to process oxygen in concentrations
greater than 25% in volume. If the oxygen concentration is greater than 25%, there is a risk of fire
or explosion in the oil-box of the pump.
WARNING
Do 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 not, injury
to people and damage to equipment can result.
Prevent any part of the human body from coming into contact with the vacuum.

A373-10-880 Issue T
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Installation
Provide for a purge of inert gas when shutting 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 the
supplier and the carrier in writing within three days; state the Item Number of the pump together with the order
number and the supplier's invoice number. Retain all packing materials for inspection. Do not use the pump if it
is damaged.
2. Check that the package contains the items listed in Ta b l e 7 . If any of these items are missing, notify the 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 the 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. Failure to use suitable lifting equipment can
result in injury to people or damage to the pump. Refer to Section 2.3 for the mass of the pump.

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Installation
A373-10-880 Issue T
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 the electrical supply voltage and frequency. If not, the motor
can be damaged.
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 automatic pump restart is not desired, use electrical control
equipment that must be reset manually.
Ensure that the electrical supply voltage corresponds with the voltage specified on the motor data plate.
Edwards recommends that connecting the electrical supply to the motor through a starter or circuit breaker that has
thermal over-current protection and 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 the thermal over-current
protection device may specify fuse ratings to ensure correct operation of the over-current protection device. Ensure
that the fuse used 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 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 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 T
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Edwards and the Edwards logo are trademarks of Edwards Limited.
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. Using a tool, tighten to a torque of 5 Nm.
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 the 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. 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. Using a
tool, tighten to a torque of 4 Nm. 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 selecting 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 the 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 selecting 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 2014. All rights reserved. Page 13
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
A373-10-880 Issue T
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 T
Page 14 © Edwards Limited 2014. 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