BOC Edwards E2M28 User manual

A373-10-880 Issue J
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

Jun 03 Issue J
E2M28 and E2M30 Rotary Vacuum Pumps
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i
1 INTRODUCTION 1
1.1 Scope and definitions 1
1.2 ATEX directive implications 1
1.3 Description 2
1.4 Gas-ballast 2
2TECHNICALDATA 4
2.1 Operating and storage conditions 4
2.2 Performance 4
2.3 Mechanical data 5
2.4 Electrical data 5
2.5 Lubrication data 6
3 INSTALLATION 8
3.1 Safety 8
3.2 System design 8
3.3 Unpack and inspect 9
3.4 Locate the pump 9
3.5 Fill the pump with oil 10
3.6 Electrical installation: single-phase motors 10
3.6.1 Introduction 10
3.6.2 Standard single-phase motors 11
3.6.3 Amphenol version single-phase motors 11
3.6.4 110/200-240 V 50 Hz or 115-120/200-230 V
60 Hz single-phase motors 11
3.7 Electrical installation: three-phase motors 15
3.8 Connect the electrical supply to the motor 15
3.8.1 Check the direction of rotation 15
3.9 Connect the pump inlet 16
3.10 Connect the pump outlet 16
3.11 Gas-ballast inlet connection 18
3.12 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
CONTENTS
Section Page
Ipsitech 8102-03

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5MAINTENANCE 23
5.1 Safety information 23
5.2 Maintenance plan 23
5.3 Check the oil level 24
5.4 Replace the oil 24
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 Fit new blades 27
5.10 Test the motor condition 27
5.11 Fault finding 27
5.11.1 The pump has failed to start 27
5.11.2 The pump fails to achieve specified performance
(failure to reach ultimate vacuum) 27
5.11.3 The pump is noisy 27
5.11.4 The pump surface temperature is above 100 oC28
5.11.5 The vacuum is not maintained after the pump is
switched off 28
5.11.6 The pumping speed is poor 28
5.11.7 There is an external oil leak 28
6 STORAGE AND DISPOSAL 29
6.1 Storage 29
6.2 Disposal 29
7 SPARES AND ACCESSORIES 30
7.1 Introduction 30
7.2 Spares 30
7.3 Accessories 30
7.3.1 Inlet Catchpot 32
7.3.2 Inlet Dust Filter 32
7.3.3 Inlet Desiccant Trap 32
7.3.4 Inlet Chemical Trap 32
7.3.5 Outlet Mist Filter 32
7.3.6 Solenoid Operated Pipeline Valve 32
7.3.7 Foreline Trap 32
7.3.8 Vibration Isolators 32
7.3.9 Oil Drain Extension 32
7.3.10 Pump Inlet Adaptor 32
7.3.11 Flexible Bellows 32
7.3.12 Pump Outlet Adaptor 32
7.3.13 Gas Ballast Banjo/Elbow Assembly 32
7.4 Gas Ballast Valve 32
RETURN OF BOC EDWARDS EQUIPMENT
CONTENTS (CONTINUED)
Section Page

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ILLUSTRATIONS
Figure Page
1 The E2M28/E2M30 pump (single-phase motor shown) 3
2 Dimensions (mm) 7
3 Electrical supply connection, single-phase motors:
220-240 V 50 Hz and 230-240 V 60 Hz 12
4 Electrical supply connection, single-phase motors:
100 V 50 Hz, 100-105 V 60 Hz and 115 V 60 Hz 12
5 Electrical supply connection, single-phase motors:
200 V 50 Hz, 200-210 V 60 Hz and 230 V 60 Hz 13
6 Electrical supply connection, single-phase motors with
Amphenol connector:
220-240 V 50 Hz and 230-240 V 60 Hz 13
7 Motor voltage selection: single-phase motors,
110/200-240 V 50 Hz and 115-120/200-240 V 60 Hz 14
8 Electrical supply connection, three-phase motors:
200-220 V 50 Hz and 200-230 V 60 Hz 17
9 Electrical; supply connection, three-phase motors:
380-415 V 50 Hz and 460 V 60 Hz 17
10 Remove/replace the inlet filter 25
11 Remove/replace the gas-ballast filter 26
12 Accessories 31

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TABLES
Table Page
1 Operating and storage conditions 4
2Performancedata 4
3Mechanicaldata 5
4 Electrical data: three-phase motors 5
5 Electrical data: single-phase motors 5
6 Lubrication data 6
7Checklistofitems 9
8 Motor connection details 10
9 Maintenance plan 24
10 Spares Item Numbers 30
11 Accessory Item Numbers 30
Associated publications
Publication title Publication Number
Vacuum pump and vacuum system safety P300-20-100

Jun 03 Issue J
E2M28 and E2M30 Rotary Vacuum Pumps
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1
INTRODUCTION
1INTRODUCTION
1.1 Scope and definitions
This manual provides installation, operation and
maintenance instructions for the following 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 your
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
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.
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.
(Continued on page 2)
Warning - refer to accompanying
documentation.
Warning - risk of electric shock.
Warning - hot surfaces.
Warning - do not block
the pump outlet.

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E2M28 and E2M30 Rotary Vacuum Pumps
INTRODUCTION
2
• 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.
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 7.3.
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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INTRODUCTION
Figure 1 - The E2M28/E2M30 pump (single-phase motor shown)
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
Note: The motor shown on 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.

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E2M28 and E2M30 Rotary Vacuum Pumps
TECHNICAL DATA
4
2TECHNICALDATA
2.1 Operating and storage conditions
2.2 Performance
Note: Where total pressures are shown in the following technical data tables, measurements
were taken using an untrapped total pressure capacitance diaphragm gauge on a header,
as specified by Pneurop standards.
Ambient operating temperature range
Ambient storage temperature range
Maximum ambient operating humidity
13 to 40 oC
-30 to 70 oC
90% RH
Normal surface temperature of the pump-body at
ultimate vacuum (ambient temperature of 20 oC)
Noise level at 1 metre
45 to 65 oC
57 dB(A) (at 50 Hz)
Table 1 - Operating and storage conditions
E2M28 E2M30
Maximum displacement
50 Hz electrical supply
60 Hz electrical supply
32.2 m3h-1
38.9 m3h-1 19 cfm
23 cfm
Maximum speed - Pneurop
50 Hz electrical supply
60 Hz electrical supply
27.5 m3h-1
33.0 m3h-1 16.2 cfm
19.4 cfm
Motor rotational speed
50 Hz electrical supply
60 Hz electrical supply
1440 r min-1
1720 r min-1 1440 r min-1 1720 r min-1
Ultimate vacuum
Without gas-ballast (partial pressure)
Without gas-ballast (total pressure)
With full gas-ballast (partial pressure)
1 x 10-4 mbar
1 x 10-2 Pa
1 x 10-3 mbar
1 x 10-1 Pa
2 x 10-1 mbar
2 x 101Pa
7 x 10-5 torr
7 x 10-4 torr
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 (at full pump throughput) 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

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TECHNICAL DATA
2.3 Mechanical data
2.4 Electrical data
Refer to Tables 4 and 5. 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.
Mass (approximate)
Dimensions
Degree of protection
Single-phase motors
Three-phase motors
44 kg
See Figure 2
IP44
IP54
Pump inlet-port
Pump outlet-port
NW25 (the flange can be removed from the 1 inch BSP threaded hole)
15 mm external diameter nozzle (the nozzle can be removed from
the 3/4inch BSP threaded hole)
Table 3 - Mechanical data
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 4 - 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 5 - Electrical data: single-phase motors

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TECHNICAL DATA
Figure 2 - Dimensions (mm): key
2.5 Lubrication data
Note: A BOC Edwards Material Safety Data Sheet for the oil specified below is
available on request.
Recommended oil Ultragrade 19 *
Maximum oil capacity 1.32 l
* To operate the pump when the ambient temperature is outside the range specified in Section 2.1, or to
optimise the pump performance when you process condensible vapours, you may need a different oil.
Table 6 - Lubrication data
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 - 251
Three-phase motors
A373-10-940, A374-10-940 - 217

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E2M28 and E2M30 Rotary Vacuum Pumps
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TECHNICAL DATA
Figure 2 - Dimensions (mm)

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E2M28 and E2M30 Rotary Vacuum Pumps
INSTALLATION
8
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.
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 oilbox 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.
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).
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 7.3.14).

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INSTALLATION
3.3 Unpack and inspect
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.
Check that your package contains the items listed in
Table 7. If any of these items are missing, notify your
supplier within three 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
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.
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.
Quantity Description Check (✓)
1 E2M28 or E2M30 rotary vacuum pump !
Fitting pack, containing the following:
1 NW25 centring-ring !
1 ‘O’ ring for centring-ring !
6 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

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E2M28 and E2M30 Rotary Vacuum Pumps
INSTALLATION
10
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
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.
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.
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

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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 Figures 3 to
5.
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 50Hz and 60Hz 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.

Issue J Jun 03
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E2M28 and E2M30 Rotary Vacuum Pumps
INSTALLATION
12
Figure 4 - Electrical supply connection, single-phase motors:
100 V 50 Hz, 100-105 V 60 Hz and 115 V 60 Hz
Figure 3 - Electrical supply connection, single-phase motors:
220-240 V 50 Hz and 230-240 V 60 Hz
Wire colour codes:
BN Brown
OR Orange
VT Violet
WH White
GY Grey

Jun 03 Issue J
E2M28 and E2M30 Rotary Vacuum Pumps
PAGE
13
13
INSTALLATION
Figure 5 - Electrical supply connection, single-phase motors:
200 V 50 Hz, 200-210 V 60 Hz and 230 V 60 Hz
Pin codes:
1Live
2Neutral
3Notused
Earth (ground)
Wire colour codes:
BN Brown
OR Orange
VT Violet
WH White
GY Grey
Figure 6 - Electrical supply connection, single-phase motors with Amphenol connector:
220-240 V 50 Hz and 230-240 V 60 Hz

Issue J Jun 03
PAGE
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E2M28 and E2M30 Rotary Vacuum Pumps
INSTALLATION
14
Figure 7 - Motor voltage selection: single-phase motors,
110/200-240 V 50 Hz and 115-120/200-240 V 60 Hz
A Top view of motor
B Internal view of top of motor
1. Terminal box cover
2. Electrical inlet socket
3. On/Off switch
4. Position 'I' (on)
5. Position 'O' (off)
6. Voltage selector switch
7. Position 'II' (high voltage setting 200 – 240 V)
8. Position 'I' (low voltage setting 110 – 120 V)