BOC E2M28 User manual

A373–10–880 Issue K 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 A373-10-940
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
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 A373-21-940
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
E2M30, 200-220/380-415 V, 50 Hz, or 200-230/460 V, 60 Hz, three-phase A374-10-940

Declaration
ofConformity
W€, BOC
Edwards,
ManorRoyal,
Crawley,
WestSussexRH102LW,UK
declare
underoursole
responsibilitythatthe
product(s)
E2M28and
E2M30Rotary
VacuumPumps
A373-10-940 A373-15-981 A374-t0-940 A373-15-903
A373-2r-940 A374-15-903 A373-15-904 A373-25-903
A374-15-904 A373-16-903 A374-15-981 4373-L7-9U
towhichthisdeclaration
relates
isin
conformity
withthefollowingstandard(s)
orother
normativedocument(s)
ENISO12100-2:
2003 SafetyofMachinery
- Basic
Concepts,
General
Principles
forDesign.
EN61010-1:
2001 SafetyRequirements
forElectricalEquipment
forMeasurement,
Control,
andLaboratory
Use.x
EN1012-2:1997 Compressors
and
VacuumPumps
- SafetyRequirements,
Part?:
Vacuum
Pumps.
IEC34Parts1,5,8i, 11x:1991 Central
Requirements
forRotating
Electrical
Machines.
C22.2
No77:t998
# Motors
withInherent
Overheating
Protection.
C22.2
No100:1992
# Motors
andGenerators.
C22.2No1010.1:
t992
# Safety
Requirements
forElectrical
EquipmentforMeasurementControl
and
LaboratoryUse,
Part1:General
Requirements.
UL61010A:
2002# Electrical
Equipment
forLaboratoryUse,
Part1:General
Requirements.
UL1004:
1994# Electric
Motors.
EN13463-1:2001 Non
Electrical
EquipmentforPotentiallyExplosive
Atmospheres.
t 3-phase
pumps
only.
x l-phase
pumps
only. The
pumps
comply
withEN61010-1
wheninstalled
inaccordance
withthe
instruction
manualsupplied
withthe
pumps.
# l-phase
pumps
only. Canadian
Standards
AuthorityandUnderwriters
Laboratory.
followingthe
provisions
of
731023/EEC Low
Voltage
Directive.
89/336iEEC Electromagnetic
Compatibility
Directive.
98137/EC Machinery
Safety
Directive.
g4lglEc Equipment
foruse
inPotentially
Explosive
Atmospheres
(ATEX
Directive)
(Category
3GD)
Internal
AtmospheresOnly.
3 Dgc.engvr ?oo\t e\ontbilFl^
Dateand
Place
This
product
hasbeen
manufactured
underaquality
sysfem
registeredtolSO9001
JD.U"A-:
Dr,
J,
D.Watson,Directorof
Technology,
VacuumEquipmentand
ExhaustManagement
Product
Divisions
^AW BOC EDWARDS
<
u
-
@
I
o
c
4

E2M28 and E2M30 Rotary Vacuum Pumps
PAGE
i
Issue K iJul 05
CONTENTS
Section Page
1INTRODUCTION 1
1.1 Scope and definitions 1
1.2 ATEX directive implications 2
1.3 Description 4
1.4 Gas-ballast 4
2TECHNICALDATA 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 6
3 INSTALLATION 11
3.1 Safety 11
3.2 System design 12
3.3 Unpack and inspect 12
3.4 Locate the pump 13
3.5 Fill the pump with oil 13
3.6 Electrical installation: single-phase motors 14
3.6.1 Introduction 14
3.6.2 Standard single-phase motors 15
3.6.3 Amphenol version single-phase motors 15
3.6.4 110/200-240 V 50 Hz or 115-120/200-230 V 60 Hz single-phase motors 15
3.7 Electrical installation: three-phase motors 19
3.7.1 Connect the electrical supply to the motor 19
3.7.2 Check the direction of rotation 20
3.8 Connect the pump inlet 20
3.9 Connect the pump outlet 22
3.10 Gas-ballast inlet connection 22
3.11 Leak test the system 22
4OPERATION 23
4.1 ATEX directive implications 23
4.1.1 Introduction 23
4.1.2 Flammable/pyrophoric materials 23
4.1.3 Gas purges 24
4.2 Gas-ballast control 24
4.3 Start-up 25
4.4 To achieve ultimate vacuum 25
4.5 To pump condensable vapours 26
4.6 To decontaminate the oil 26
4.7 Unattended operation 26
4.8 Shut-down 27
Ipsitech 8207(D)–05

E2M28 and E2M30 Rotary Vacuum Pumps
PAGE
ii
Issue K ii Jul 05
Section Page
5 MAINTENANCE 29
5.1 Safety information 29
5.2 Maintenance plan 29
5.3 Check the oil-level 30
5.4 Replace the oil 30
5.5 Inspect and clean the inlet-filter 31
5.6 Clean the gas-ballast filter 32
5.7 Clean the motor fan-cover and enclosure 33
5.8 Clean and overhaul the pump 33
5.9 Fit new blades 33
5.10 Test the motor condition 33
5.11 Fault finding 33
5.11.1 Introduction 33
5.11.2 The pump has failed to start 33
5.11.3 The pump fail to achieve specified performance (failure to reach ultimate vacuum) 34
5.11.4 The pump is noisy 34
5.11.5 The pump surface temperature is above 100 oC34
5.11.6 The vacuum is not maintained after the pump is switched off 35
5.11.7 The pumping speed is poor 35
5.11.8 There is an external oil leak 35
6 STORAGE AND DISPOSAL 37
6.1 Storage 37
6.2 Disposal 37
7 SERVICE, SPARES AND ACCESSORIES 39
7.1 Introduction 39
7.2 Service 39
7.3 Spares 39
7.4 Accessories 40
7.4.1 Introduction 40
7.4.2 Inlet Catchpot 40
7.4.3 Inlet Dust Filter 40
7.4.4 Inlet Desiccant Trap 40
7.4.5 Inlet Chemical Trap 40
7.4.6 Outlet Mist Filter 40
7.4.7 Solenoid Operated Pipeline Valve 42
7.4.8 Foreline Trap 42
7.4.9 Vibration Isolators 42
7.4.10 Oil Drain Extension 42
7.4.11 Pump Inlet Adaptor 42
7.4.12 Flexible Bellows 42
7.4.13 Pump Outlet Adaptor 42
7.4.14 Gas Ballast Banjo/Elbow Assembly 42
7.4.15 Gas Ballast Valve 42
RETURN OF BOC EDWARDS EQUIPMENT

E2M28 and E2M30 Rotary Vacuum Pumps
PAGE
iii
Issue K iii Jul 05
ILLUSTRATIONS
Figure Page
1 The E2M28/E2M30 pump 3
2 Dimensions (mm): key 8
3 Electrical supply connection: single-phase motors: 220-240 V 50 Hz and
230-240 V 60 Hz 16
4 Electrical supply connection: single-phase motors: 100 V 50 Hz, 100-105 V 60 Hz
and 115 V 60 Hz 16
5 Electrical supply connection, single-phase motors: 200 V 50 Hz, 200-210 V 60 H
and 230 V 60 Hz 17
6 Electrical supply connection, single-phase motors with Amphenol connector:
220-240 V 50 Hz and 230-240 V 60 Hz 17
7 Motor voltage selection: single-phase motors, 110/200-240 V 50 Hz and
115-120/200-240 V 60 Hz 18
8 Electrical supply connection, three-phase motors: 200-220 V 50 Hz and
200-230 V 60 Hz 21
9 Electrical supply connection, three-phase motors: 380-415 V 50 Hz and 460 V 60 Hz 21
10 Remove/replace the inlet filter 31
11 Remove/replace the gas-ballast filter 32
12 Accessories 41
TABLES
Table Page
1 Operating and storage conditions 5
2Performancedata 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 12
8 Motor connection details 14
9 Maintenance plan 30
10 Spares Item Numbers 39
11 Accessory Item Numbers 40
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

E2M28 and E2M30 Rotary Vacuum Pumps
PAGE
iv
Issue K iv Jul 05
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E2M28 and E2M30 Rotary Vacuum Pumps
INTRODUCTION
PAGE
1
Issue K 1Jul 05
1INTRODUCTION
1.1 Scope and definitions
This manual provides installation, operation and maintenance instructions for the BOC 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.
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 – refer to accompanying documentation.
Warning – risk of electric shock.
Warning – hot surfaces.
WARNING
Warnings are given where failure to observe the instruction could result in injury or death
to people.
CAUTION
Cautions are given where failure to observe the instruction could result in damage to the equipment,
associated equipment and process.
Warning - do not block the pump outlet.

E2M28 and E2M30 Rotary Vacuum Pumps
INTRODUCTION
PAGE
2
Issue K 2Jul 05
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.
• Use an inert gas purge (for example, a nitrogen purge) to dilute any flammable gases or
vapours entering the pump inlet, and/or use an inert gas purge to reduce the concentration
of flammable gases or vapours in the pump and in the exhaust pipeline to less than one quarter
of the gases' published lower explosive limits (LEL).
• For further information, please contact BOC Edwards: refer to the Addresses page at the end of
this manual for details of your nearest BOC Edwards company.

E2M28 and E2M30 Rotary Vacuum Pumps
INTRODUCTION
PAGE
3
Issue K 3Jul 05
Figure 1 – The E2M28/E2M30 pump
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. Baseplate
11. Oil drain-plug (gravity drain)
12. Oil sight-glass
13. Pump identification label
Notes: A pump with a single-phase motor is shown in this figure.
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.

E2M28 and E2M30 Rotary Vacuum Pumps
INTRODUCTION
PAGE
4
Issue K 4Jul 05
1.3 Description
The BOC 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.
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 an
aluminium alloy baseplate (10) on rubber pads. Details of suitable vibration isolators and other
recommended accessories are given in Section 7.4.
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.

E2M28 and E2M30 Rotary Vacuum Pumps
TECHNICAL DATA
PAGE
5
Issue K 5Jul 05
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.
Ambient temperature range (operation) 13 to 40 oC
Ambient temperature range (storage) -30 to 70 oC
Normal surface temperature of the pump-body * 45 to 65 oC
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)
* At ultimate vacuum, with ambient temperature of 20 oC.
Table 1 – Operating and storage conditions
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
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 2 – Performance data

E2M28 and E2M30 Rotary Vacuum Pumps
TECHNICAL DATA
PAGE
6
Issue K 6Jul 05
2.3 Mechanical data
2.4 Lubrication data
Note: A BOC Edwards Material Safety Data Sheet for the oil specified below is available on request.
2.5 Electrical data
Refer to Tables 5 and 6. 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 ºC, the start-up current will be drawn for longer; this may cause
the motor thermal overload device to open.
Approximate pump mass 44 kg
Dimensions See Figure 2
Degree of protection
Single-phase motors
Three-phase motors
IP44
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 3/4inch BSP threaded hole)
Table 3 – Mechanical data
Recommended oil * Ultragrade 19
Maximum oil capacity 1.32 litres
* 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.
Table 4 – Lubrication data

E2M28 and E2M30 Rotary Vacuum Pumps
TECHNICAL DATA
PAGE
7
Issue K 7Jul 05
Pump Item Number Voltage
(V)
Frequency
(Hz)
Full load
current
(A)
Start
current
(A)
Maximum
fuse
rating (A)
A373-10-940, A374-10-940
200-220
380-415
200-230
460
50
50
60
60
3.8
2.3
3.9
2.3
22.8
14.3
22.0
14.6
16
10
16
10
Motor output rating (continuous)
50 Hz operation
60 Hz operation
0.75 kW
0.90 kW
Table 5 – Electrical data: three-phase motors
Pump Item Number Voltage
(V)
Frequency
(Hz)
Full load
current
(A)
Start
current
(A)
Maximum
fuse
rating (A)
A373-15-903, A373-16-903,
A374-15-903
220-240
230-240
50
60
4.8
5.0
33
33
15
15
A373-15-981, A374-15-981 115
230
60
60
11.0
5.5
71
36
40
20
A373-15-904, A374-15-904
100
100-105
200
200-210
50
60
50
60
12.0
12.0
6.5
5.5
80
80
40
40
30
30
20
20
A373-17-984
110
115-120
200-240
200-230
50
60
50
60
12.0
12.0
6.0
6.5
36
50
27
32
30
30
15
15
Motor output rating (continuous)
50 Hz operation
60 Hz operation
0.75 kW
0.90 kW
Table 6 – Electrical data: single-phase motors

E2M28 and E2M30 Rotary Vacuum Pumps
TECHNICAL DATA
PAGE
8
Issue K 8Jul 05
Figure 2 – Dimensions (mm): key
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 - 251
Three-phase motors
A373-10-940, A374-10-940 - 217
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

E2M28 and E2M30 Rotary Vacuum Pumps
TECHNICAL DATA
PAGE
9
Issue K 9Jul 05
Figure 2 – Dimensions (mm)

E2M28 and E2M30 Rotary Vacuum Pumps
PAGE
10
Issue K 10 Jul 05
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E2M28 and E2M30 Rotary Vacuum Pumps
INSTALLATION
PAGE
11
Issue K 11 Jul 05
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 BOC Edwards guidelines
on vacuum pump and vacuum system safety (see the Associated Publication at the end of the
contents list at the front of this manual).
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.

E2M28 and E2M30 Rotary Vacuum Pumps
INSTALLATION
PAGE
12
Issue K 12 Jul 05
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 oC 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.
• 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 (see Section 7.4.15).
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.
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 and A373-17-984.
Table 7 – Checklist of items

E2M28 and E2M30 Rotary Vacuum Pumps
INSTALLATION
PAGE
13
Issue K 13 Jul 05
3.4 Locate the pump
The pump can be either free-standing on its baseplate, or be fixed by bolts through the four fixing holes
in the baseplate, or be used with vibration isolators. For the locations of the fixing holes in the baseplate,
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 oC. There must
be a minimum space of 25 mm between the pump and the enclosure walls.
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.
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.

E2M28 and E2M30 Rotary Vacuum Pumps
INSTALLATION
PAGE
14
Issue K 14 Jul 05
3.6 Electrical installation: single-phase motors
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.
Table 5 gives the recommended fuse rating, and Table 8 specifies the Figure which identifies the correct
electrical supply connection details.
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 oC 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.
CAUTION
Ensure that the motor is correctly configured for your electrical supply voltage and frequency. If you
do not, you can damage the motor.
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
230
60
60
4
5
A373-15-904, A374-15-904 100
100-105
200
200-210
50
60
50
60
4
4
5
5
A373-17-984 (all) 50/60 7
Table 8 – Motor connection details