Edwards EXC120 User manual

D396-14-880
Issue J Original
Instruction Manual
EXC Turbomolecular Pump Controllers
Description Item Number
EXC120 Controller D396-16-000
EXC120E Controller D396-17-000
EXC300 Controller D396-14-000
EXC300M Controller D396-15-000

This product has been manufactured under a quality management system certified to ISO 9001:2008
Declaration of Conformity
We, Edwards Limited,
Crawley Business Quarter,
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)
Turbomolecular Pump Controllers
EXC300 D396-14-000
EXC300M D396-15-000
EXC120 D396-16-000
EXC120E D396-17-000
to which this declaration relates is in conformity with the following standard(s) or other
normative document(s)
EN61010-1: 2010 Safety Requirements for Electrical Equipment for Measurement,
Control and Laboratory Use. General Requirements
and fulfils all the relevant provisions of
2014/35/EU Low Voltage Directive
2014/30/EU Electromagnetic Compatibility (EMC) Directive
Note: This declaration covers all product serial numbers from the date this Declaration was
signed onwards.
16.07.2015, Eastbourne
Larry
Marini, Senior Technical Manage
r
Date and Place
P200-03-100 Issue D

P200-10-033
Issue A
Material Declaration
In accordance with the requirements of the Chinese regulatory requirement on the Management Methods for the
Restriction of the Use of Hazardous Substances in Electrical and Electronic Products Order No. 32 (also known as
‘China RoHS2’) and SJ/T 11364 Marking for the Restricted Use of Hazardous Substances in Electronic and Electrical
Products:
Product Product Label Meaning
Turbomolecular pumps:
D39614000 EXC300
D39615000 EXC300M
D39616000 EC120
D39617000 EXC120E
This product contains hazardous substances in at least
one of the homogeneous materials used which are
above the limit requirement in GB/T 26572 as
detailed in the declaration table below.
These parts can safely be used for the environmental
protection use period as indicated.
材料成分声明
Materials Content Declaration
部件名称
Part name
有害物质
Hazardous Substances
铅
Lead
(Pb)
汞
Mercury
(Hg)
镉
Cadmium
(Cd)
六价铬
Hexavalent
Chromium
(Cr VI)
多溴联苯
Polybrominated
biphenyls (PBB)
多溴二苯醚
Polybrominated
diphenyl ethers
(PBDE)
印刷电路组件
(PCA)
Printed Circuit
Assembly (PCA)
X O X O O O
电缆/电线/连接器
Cable/wire/connector
X O O O O O
机械部件
Mechanical Components
X O O O O O
O: 表示该有害物质在该部件的所有均质材料中的含量低于 GB/T 26572 标准规定的限量要求。
O: Indicates that the hazardous substance contained in all of the homogeneous materials for this part is
below the limit requirement in GB/T 26572.
X: 表示该有害物质在该部件的至少一种均质材料中的含量超出 GB/T26572 标准规定的限量要求。
X: Indicates that the hazardous substance contained in at least one of the homogeneous materials used for
this part is above the limit requirement of GB/T26572.
NOTE: These products are EU RoHS compliant, the following Exemptions apply:
6(b)
Lead
as an alloying element in aluminium containing up to 0.4% by weight
6(c) Copper alloy containing up to 4%
lead
by weight
7(a)
Lead
in in high melting temperature type solder (i.e. lead based alloys containing 85% by or more)
7(b)
Lead
in solders for servers, storage and storage array systems, network infrastructure equipment for switching, signalling,
transmission, and network management for telecommunications
7(c) I Electrical and electronic components containing
lead
in a glass or ceramic other than dielectric ceramic in capacitors, e.g.
piezoelectronic devices, or in a glass or ceramic matrix compound
7(c) II
Lead
in dielectric ceramic in capacitors for a rated voltage of 125 V AC or 250 V DC or higher
8(b)
Cadmium
and its compounds in electrical contacts
15
Lead
in solders to complete a viable electrical connection between semiconductor die and carrier within integrated circuit flip
chip packages
34
Lead
in cermet-based trimmer potentiometer elements

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Contents
D396-14-880 Issue J
Contents
Section Page
1 Introduction .......................................................................................1
1.1 Scope and definitions ................................................................................................... 1
1.2 Description ................................................................................................................ 2
1.3 Controls and indicators (EXC120/300/300M only) .................................................................. 3
1.4 Bakeout band control (EXC120/300/300M only) .................................................................... 6
1.5 Connection of an Active gauge ........................................................................................ 7
1.6 Backing pump control (EXC120/300/300M only) .................................................................... 7
1.7 Logic interface ........................................................................................................... 7
1.7.1 Introduction ..............................................................................................................7
1.7.2 Electrical supplies .......................................................................................................8
1.7.3 Control inputs ............................................................................................................8
1.7.4 Status outputs ............................................................................................................9
1.7.5 Analogue outputs ........................................................................................................ 9
1.8 Vent-valve control ......................................................................................................10
1.8.1 Vent on Stop .............................................................................................................10
1.8.2 Vent on Fail and Vent on Axial Emergency .........................................................................10
1.9 Controller Fail conditions ..............................................................................................11
1.9.1 General ...................................................................................................................11
1.9.2 Internal Timer ...........................................................................................................11
1.9.3 Axial Emergency (EXC300M only) .....................................................................................12
1.10 Electrical connections ..................................................................................................12
2 Technical data .................................................................................. 17
2.1 Operating and storage conditions ....................................................................................17
2.2 Mechanical data .........................................................................................................17
2.3 Electrical data ...........................................................................................................17
2.4 Electrical connectors ...................................................................................................19
2.5 Factory settings .........................................................................................................19
3 Installation ....................................................................................... 23
3.1 Unpack and Inspect .....................................................................................................23
3.2 Fit the Controller .......................................................................................................23
3.3 Introduction to Controller electrical connections .................................................................24
3.4 Connect the electrical supply .........................................................................................27
3.5 Connect additional earth (ground) bonding (if required) .........................................................27
3.6 Connect the EXT pump .................................................................................................27
3.7 Connect the backing pump (EXC120/300/300M only) .............................................................28
3.8 Connect the bakeout band (EXC120/300/300M only) .............................................................28
3.9 Connect an Active gauge ..............................................................................................28
3.10 Connect the logic interface to your equipment ....................................................................30
3.11 Adjust the Normal speed setpoint ...................................................................................30
3.12 Adjust the Internal Timer .............................................................................................30
3.13 Configure the Controller ...............................................................................................31
3.13.1 Introduction .............................................................................................................31
3.13.2 Enable/disable the Internal Timer to monitor low pump speed .................................................31
3.13.3 Vent options .............................................................................................................32
4 Operation ........................................................................................ 33
4.1 Start-up ..................................................................................................................33
4.2 Standby ...................................................................................................................33
4.3 Bakeout band control (EXC120/300/300M only) ...................................................................34
Ipsitech 9001(17)-2008

D396-14-880 Issue J
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Edwards and the Edwards logo are trademarks of Edwards Limited.
Contents
4.4 Operation with high inlet pressure ...................................................................................34
4.5 Operation with high pump temperature ............................................................................34
4.6 The hours counter (EXC300 only) .....................................................................................35
4.7 Normal shutdown .......................................................................................................35
4.8 Automatic shutdown after Fail condition ...........................................................................36
4.9 Reset the Controller after Fail condition ...........................................................................36
4.10 Electrical supply failure ...............................................................................................36
5 Maintenance ..................................................................................... 37
5.1 Safety .....................................................................................................................37
5.2 Replace a fuse ...........................................................................................................37
5.2.1 Introduction .............................................................................................................37
5.2.2 Replace the electrical supply fuse ...................................................................................37
5.2.3 Replace the bakeout band fuse (EXC120/300/300M only) ........................................................37
5.3 Fault finding .............................................................................................................38
5.4 Clean the Controller ....................................................................................................38
6 Storage and disposal ........................................................................... 39
6.1 Storage ...................................................................................................................39
6.2 Disposal ...................................................................................................................39
7 Spares and accessories ......................................................................... 41
7.1 Introduction .............................................................................................................41
7.2 Spares .....................................................................................................................41
7.3 Accessories ...............................................................................................................41
7.3.1 Pump-to-controller cable ..............................................................................................41
7.3.2 BX bakeout band (EXC120/300/300M only) .........................................................................42
7.3.3 TAV vent-valve ..........................................................................................................42
7.3.4 ACX air-cooler ...........................................................................................................42
7.3.5 Active vacuum gauges ..................................................................................................43
8 Engineering diagrams .......................................................................... 45

© Edwards Limited 2008. All rights reserved. Page iii
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Contents
D396-14-880 Issue J
Illustrations
Figure Page
1 EXC120 Controller front panel ......................................................................................... 4
2 EXC300/300M Controller front panel ................................................................................. 5
3 Rear panel of the EXC120 Controller ................................................................................13
4 Rear panel of the EXC120E Controller ...............................................................................14
5 Rear panel of the EXC300/300M Controller .........................................................................15
6 EXC120, EXC300 and EXC300M Controller dimensions (mm) .....................................................20
7 EXC120E Controller dimensions (mm) ...............................................................................21
8 Schematic diagram of EXC120 & EXC120E Controller electrical connections .................................25
9 Schematic diagram of EXC300 & EXC300M Controller electrical connections .................................26
10 Direct operation of the backing pump ...............................................................................29
11 Operation of the backing pump through a contactor .............................................................29
12 Top cover of the Controller ...........................................................................................31
13 Hours counter (EXC300 only) ..........................................................................................35
14 EXC120/120E/300 Controller to EXT pump connections ..........................................................45
15 EXC300M Controller to EXT pump connections .....................................................................46
16 Active Gauge connector ...............................................................................................46
Tables
Table Page
1 Operating and storage conditions ....................................................................................17
2 Mechanical data .........................................................................................................17
3 Logic interface electrical data .......................................................................................17
4 Fuse ratings ..............................................................................................................17
5 Controllers electrical and other technical data ....................................................................18
6 Electrical connectors data ............................................................................................19
7 Factory settings .........................................................................................................19
8 Checklist of items .......................................................................................................23
9 Logic interface pins ....................................................................................................24
10 Selection of vent-valve control options .............................................................................32
11 Active Gauge connector pins ..........................................................................................46
Associated publications
Publication title Publication number
EXT Pump Accessories B580-66-880
EXT70 and EXT250 Turbomolecular pumps B722-01-880
EXT351 and EXT501 Turbomolecular Pumps B727-20-880
EXT250M Turbomolecular Pump B735-01-880

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D396-14-880 Issue J
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Edwards and the Edwards logo are trademarks of Edwards Limited.

© Edwards Limited 2008. All rights reserved. Page 1
Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
D396-14-880 Issue J
1Introduction
1.1 Scope and definitions
This manual provides installation, operation and maintenance instructions for the Edwards EXC120, EXC120E, EXC300
and EXC300M Turbomolecular Pump Controllers (abbreviated to Controller in the remainder of this manual). You must
use the Controller as specified in this manual.
Read this manual before you install and operate the Controller. Important safety information is highlighted as
WARNING and CAUTION instructions; you must obey these instructions.The use of WARNINGS andCAUTIONS 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 following IEC warning labels appear on the pump:
The units used throughout this manual conform to the SI international system of units of measurement.
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.
Protective conductor terminal.

D396-14-880 Issue J
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Introduction
1.2 Description
The EXC Controller generates the electrical supply and the control signals necessary to operate an EXT pump and its
accessories.
The Controller has a high-efficiency, auto-ranging power supply which adjusts itself to any external electrical supply
in the specified voltage range (refer to Section 2). The power supply converts the single-phase electrical supply into
a regulated d.c. electrical supply to control the operation of the EXT pump. The pump has three Hall effect devices
which operate as rotor position sensors. These sensors ensure that the drive current is correctly commutated to the
pump-motor phase-windings. The Hall effect devices also generate a speed signal which the Controller uses to
regulate the rotational speed of the pump.
The Controller has a secondary regenerative supply which uses the d.c. motor of the EXT pump as a generator. If the
electrical supply fails, the regenerative supply provides the Controller with a back-up source of power without the
need for batteries. All Controllers use the regenerative supply to maintain the electrical supply to the vent-valve
until the pump speed falls to below 50% of full rotational speed (see Section 1.8). The EXC300M Controller also uses
the regenerative supply to provide sufficient power to the electromagnetic bearings of the EXT250M pump until the
rotational speed of the pump is low enough for the pump rotor to drop onto the safety bearings.
The Controllers have a number of safety features which limit the power supplied to the EXT pump in the event of
sustained high pressure or temperature:
zIf the EXT pump inlet pressure rises, the power supplied to the pump-motor increases to counteract the gas
frictional load. The pump rotational speed remains constant until the Controller peak power level is reached;
beyond this power level, the speed of the pump starts to reduce. If the pump speed falls to below 50% of its
full rotational speed, the Controller may trip into Fail condition, depending on how you have configured the
Controller (see Section 1.9.2).
zIf the Controller detects that its temperature or the pump temperature is too high, it reduces the power
supplied to the pump-motor; the pump may not therefore be able to maintain full rotational speed if it is too
hot. If the pump speed falls to below 50% of its full rotational speed, the Controller may trip into Fail
condition, depending on how you have configured the Controller (see Section 1.9.2).
You can use the EXC120, EXC300 and EXC300M Controllers as stand-alone controllers. Alternatively, you can connect
the Controller to your own equipment; you can then use either the Controller or your own equipment to control the
system.
The EXC120E Controller has no front-panel controls and can only be operated through the logic interface. You must
therefore connect an EXC120E Controller to your own control equipment.

© Edwards Limited 2008. All rights reserved. Page 3
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Introduction
D396-14-880 Issue J
1.3 Controls and indicators (EXC120/300/300M only)
Note: In addition to the controls and indicators on the front panel, the EXC120, EXC300 and EXC300M Controllers
have an electrical supply isolator on the rear panel (see Figures 3to 5).
The controls and indicators on the front panel of the EXC120, EXC300 and EXC300M Controllers are shown in Figures
1and 2and are described below.
Start/Stop
Use this latching button to alternately Start or Stop the EXT pump. A LED on the button goes on when EXT Start has
been selected. Note that:
zThe button is wired in series with the Start/Stop input on the logic interface (see Section 1.7.3). The EXT
pump will not start until Start is selected from this front panel button and the Start/Stop input is closed. The
Controller is supplied with a wire link to close the Start/Stop input.
zIf the LED on the button is on, it only means that Start has been selected; it does not necessarily mean that
the pump has successfully started.
zThe Controller delays the Start operation until the Interlocks are closed (refer to Section 1.7.3); therefore,
the EXT pump will not necessarily start to operate when you select Start. If you select Start and the
Interlocks are not closed, the LED on the button will flash.
This button is also used to reset the Controller after Fail or Axial Emergency condition (see Section 4.9).
Standby
Use this latching button to select pump Standby mode at any time. In Standby, the rotational speed of the EXT pump
is reduced to 70% of its full rotational speed. Selection of Standby prolongs the life of the pump bearings. Note that:
zThe button is wired in parallel with the Standby input on the logic interface (see Section 1.7.3) and you can
use either the button or the input to select Standby.
zThe LED on the button is on when Standby is selected (either by the button or by the Standby input).
Heater
Use this switch to switch on the electrical supply to the bakeout band. Note that the Controller only switches on the
electrical supply to the bakeout band when the EXT pump speed reaches the Normal speed setpoint (see
Section 1.7.4).
The LED on the switch is on when the electrical supply to the bakeout band is switched on; this LED can therefore be
used as an indication that the pump has reached Normal speed.

D396-14-880 Issue J
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Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
Figure 1 - EXC120 Controller front panel
1. Speed indicator
2. Heater (bakeout band) switch
3. Standby button
4. Start/Stop button
5. Electrical supply LED
6. Fail LED
7. Not used
8. Pump rotating LED (amber)
9. Pump speed >25% LED (amber)
10.Pump speed >50% LED (green)
11.Pump speed >75% LED (green)

© Edwards Limited 2008. All rights reserved. Page 5
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Introduction
D396-14-880 Issue J
Figure 2 - EXC300/300M Controller front panel
1. Speed indicator
2. Heater (bakeout band) switch
3. Standby button
4. Start/Stop button
5. Electrical supply LED
6. Fail LED
7. Emergency LED (EXC300M only)
8. Pump rotating LED (amber)
9. Pump speed >25% LED (amber)
10.Pump speed >50% LED (green)
11.Pump speed >75% LED (green)
12.Hours counter (EXC300 only)

D396-14-880 Issue J
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Introduction
Speed
The speed indicator has 4 LEDs which go on to indicate the rotational speed of the EXT pump. Each LED goes on when
the speed of the pump is above a certain value, represented as a percentage of the full operating speed of the pump.
Refer to Figures 1and 2: the bottom LED (8) goes on as soon as the pump rotor starts to rotate; the next LED (9) goes
on when the rotational speed is > 25% of full rotational speed. The first green LED (10) goes on when the speed is >
50% of full rotational speed; the top LED (11) goes on when the speed is > 75% of full rotational speed. Note that:
zWhen the pump starts, the bottom LED goes on as soon as the pump rotor starts to rotate.
zWhen the pump decelerates, the bottom LED goes off as soon as the pump speed falls to below 10% of full
rotational speed.
zWhen only the bottom two LEDs are on, the pump speed is below 50% of its full rotational speed and the
Controller may trip into Fail condition, depending on how you have configured the Controller (see
Section 1.9.2).
zWhen the pump is at Standby rotational speed, the top LED is off.
Emergency
This LED is only available on the EXC300M Controller. When the LED is on, this indicates an Axial Emergency condition
(refer to Section 1.9.3).
Fail
This LED is on when the Controller has tripped into Fail condition (refer to Section 1.9).
~
This LED is on when the Controller is connected to the electrical supply and the electrical supply isolator on the rear
of the Controller (see Figures 3and 5) is switched on.
Hours counter
This counter is only available on the EXC300 Controller. The counter shows the total elapsed time that the EXC300
Controller has operated an EXT pump.
1.4 Bakeout band control (EXC120/300/300M only)
The EXC120, 300 and 300M Controllers can be used to operate a bakeout band.
The Controller will switch on the electrical supply to the bakeout band when the Heater switch on the front panel is
switched on and the EXT pump is at Normal speed (refer to Sections 1.3 and 1.7.4).

© Edwards Limited 2008. All rights reserved. Page 7
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Introduction
D396-14-880 Issue J
1.5 Connection of an Active gauge
Note: If you connect an Edwards Active gauge to operate the TMPI control input signal to the logic interface, you
cannot also use another signal to operate the TMPI control input.
You can directly connect an Edwards Active gauge to the Controller (refer to Section 7.3.5 for suitable gauges). For
example:
zYou can use the set-point facility of an APG Active Pirani Gauge or an ATC Active Thermocouple Gauge
(which is used to measure system or backing pressure) to operate the TMPI control input signal to the logic
interface.
zYou can connect an AIM Active Inverted Magnetron Gauge and use the Controller TMP Normal signal to switch
the gauge on. This allows you to control the AIM Gauge without the need to use an additional high pressure
gauge (and its associated control equipment) to interlock the operation of the AIM Gauge to system pressure.
Refer to Section 3.9 for details of the connection of an Active gauge to the Controller.
If you want to use any alternative gauges, you must connect the gauge to its associated control equipment and then
connect the set-point output of the control equipment to the logic interface.
1.6 Backing pump control (EXC120/300/300M only)
The EXC120, EXC300 and EXC300M Controllers can be used to control the operation of a backing pump through a
backing pump relay. The operation of this relay depends on how you have configured the Controller to operate the
vent-valve: refer to Sections 1.8 and 3.13.
1.7 Logic interface
1.7.1 Introduction
The rear panel of the Controller has a logic interface connector (see Figures 3to 5) which you can use to connect the
Controller to your own equipment. The EXC120 and EXC120E Controllers have a 17-way connector and the EXC300
and EXC300M Controllers have an 18-way connector.
Signals on the logic interface are of four types:
Refer to Table 3 and to Figures 8and 9for detailed information about the logic interface pins and their uses. A
general description of the logic interface connections follows.
zElectrical supplies These are electrical supplies for accessories connected to your pump; that is,
the vent-valve and the air-cooler.
zControl inputs These are switch-type input signals which are used to control the operation of
the pumping system.
zStatus outputs These outputs identify the status of the pump and the Controller.
zAnalogue output The speed output provides an indication of the EXT pump speed.

D396-14-880 Issue J
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Introduction
1.7.2 Electrical supplies
Two 24 V supplies are provided, as described below
Vent-valve supply
This electrical supply is provided to operate a vent-valve fitted to your EXT pump or vacuum system. The Controller
automatically opens the valve when the speed of the pump falls to below 50% of full rotational speed (see
Section 1.8). You can also configure the Controller to operate the valve in other specific conditions: refer to Sections
1.8 and 3.13.
Air-cooler supply
This electrical supply is provided to operate an ACX air-cooler fitted to your EXT pump. The electrical supply is on
whenever the Controller is on. If your pump is water-cooled, you can use this supply to operate a solenoid-valve to
control the flow of water through the water-cooler.
1.7.3 Control inputs
Note: The Controller is supplied with wire links fitted to close the TMP and SYS Interlocks and to close the Start/
Stop input. The Controller cannot start the EXT pump if any of these three inputs are open.
You can use these signals to control the operation of the EXT pump. The signals are switch-type inputs in which two
pins on the logic interface are linked (closed) when you want to set the required signal and are unconnected (open)
when you do not wish to set the signal.
Two of the inputs (Start/Stop and Standby) have the same functions as the buttons of the same name on the
Controller front panel (on EXC120, EXC300 and EXC300M Controllers). The other two inputs are Interlocks and the
Controller will only operate the EXT pump if both Interlocks are closed (and if no Fail condition is present).
Start/Stop
Use the Start/Stop input to Start and Stop the EXT pump. Note that on the EXC120, EXC300 and EXC300M Controllers,
the signal is wired in series with the Start/Stop button on the front panel, so you must close the Start/Stop input and
press the Start/Stop button on the front panel to Start the pump. To stop the pump, either open the input (that is,
open the link between the appropriate logic interface pins), or press the Start/Stop button again.
Standby
Close the Standby input to select pump Standby (refer to Section 1.3). Note that on the EXC120, EXC300 and EXC300M
Controllers, the Standby input is wired in parallel with the Standby button on the front panel and you can use either
the button or the input to select Standby at any time.
TMP Interlock (TMPI)
Use the TMP Interlock todelay the start of the EXT pump until the backing pump has sufficiently reduced the pressure
in the vacuum system. You can therefore control the TMP Interlock either by a timer or by a pressure switch in the
backing pipeline of your system. Note that:
zIf the TMP Interlock is open when Start is selected, the Start LED on the Start/Stop button will flash.
zIf the TMP Interlock is opened after Start is selected, but with the SYS Interlock open, the Start LED will
continue to flash.
zIf the TMP Interlock is opened after the EXT pump has started, the Controller will trip into Fail condition.

© Edwards Limited 2008. All rights reserved. Page 9
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Introduction
D396-14-880 Issue J
SYS Interlock (SYSI)
Note: The EXC120E Controller does not have a backing pump relay.
Use the SYS Interlock to interlock the Controller to a system fail or control signal, for example, a position switch on
a door of the vacuum chamber or a start contactor for a backing pump.
When the SYS Interlock opens:
zthe backing pump relay opens (see Section 1.8)
zthe electrical supply to the vent-valve is switched off (see Section 1.8).
Note that:
zIf the SYS Interlock is open when Start is selected, the Start LED on the Start/Stop button will flash.
zIf the SYS Interlock is opened after Start has been selected, but with the TMP Interlock open, the Start LED
will continue to flash.
zIf the SYS Interlock is opened after the EXT pump has started, the Controller will trip into Fail condition. If
the SYS Interlock then closes again, the vent option you have selected (refer to Sections 1.8 and 3.13) will
determine the operation of the backing pump relay and the electrical supply to the vent-valve.
1.7.4 Status outputs
The Controller provides Normal and Fail status output signals (TMP Normal and TMP Fail) through volt-free contacts
on the logic interface connector. The EXC300M Controller also provides an Axial Emergency condition signal (also on
a volt-free contact). These signals can be used to control devices in the pumping system or provide remote status
output signals.
The signals operate as described below.
1.7.5 Analogue outputs
The Pump Speed analogue output signal is proportional to EXT pump speed. Connect the output to a suitable meter
or indicator to display the pump speed or connect the output to your control equipment (for example, to operate
other components in the pumping system at preset EXT pump speeds).
zTMP Normal TMP Normal is normally open and closes when the EXT pump speed reaches the
Normal speed setpoint. The Normal speed setpoint is determined by a
potentiometer on the top of the Controller. The Controller is supplied with the
potentiometer adjusted so that the Normal speed setpoint is 80% of full rotational
speed. You can adjust the Normal speed setpoint as described in Section 3.11.
zTMP Fail TMP Fail is normally closed and opens when the Controller trips into Fail condition
(see Section 1.9).
zAxial Emergency
(EXC300M only) Axial Emergency is normally closed and opens when an Axial Emergency is detected (see Section 1.9.3).

D396-14-880 Issue J
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Introduction
1.8 Vent-valve control
Notes: 1. The EXC120E Controller does not have a backing pump relay.
2. The vent option factory settings are shown in Table 7.
Provided that the SYS Interlock is closed: if the Controller electrical supply fails, the Controller maintains the
electrical supply to the vent-valve until the pump speed falls to below 50% of full rotational speed. The Controller
then switches off the vent-valve electrical supply and opens the backing pump relay. This feature of the Controller
cannot be reconfigured.
However, you can use the configuration DIP switches on the Controller (refer to Section 3.13) to select any one of
(or any combination of) the following options:
zVent on Stop (Stop selected either by the front-panel button or the Start/Stop input on the logic interface).
zVent on Fail condition.
zVent on Axial Emergency condition (only available on the EXC300M Controller: see Section 1.9.3).
When a selected vent option condition is detected, the Controller:
zwaits approximately 2 seconds, to allow a vacuum system isolation-valve (if fitted) to close,
zthen switches off the electrical supply to the vent-valve,
zthen opens the backing pump relay.
1.8.1 Vent on Stop
Note: If the SYS Interlock opens, a Fail condition will occur and the Controller will switch off the vent-valve
electrical supply: see Sections 1.9.1 and 3.13.
Vent on Stop selected
When you switch on the Controller, the vent-valve electrical supply remains off until Start is selected. Provided that
the SYS Interlock is closed, the Controller switches the vent-valve electrical supply on when Start is selected.
If Stop is then selected, the Controller switches the vent-valve electrical supply off again.
Vent on Stop not selected
When you switch on the Controller, the vent-valve electrical supply remains off until Start is selected. Provided that
the SYS Interlock is closed, the Controller switches the vent-valve electrical supply on when Start is selected.
If Stop is thenselected, the EXT pumpwill decelerate. The vent-valve electrical supply will remain on until the pump
speed falls to below 50% of full rotational speed, at which point the vent-valve electrical supply will be switched off.
1.8.2 Vent on Fail and Vent on Axial Emergency
Note: The Vent on Axial Emergency option is only available on the EXC300M Controller.
If the Controller is configured to Vent on Fail or Vent on Axial Emergency, the Controller will switch off the vent-
valve electrical supply as soon as Fail condition or Axial Emergency condition is detected.

© Edwards Limited 2008. All rights reserved. Page 11
Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
D396-14-880 Issue J
1.9 Controller Fail conditions
1.9.1 General
The Controller will trip into Fail condition if any of the following occurs:
zThe TMP or SYS Interlock opens while the EXT pump is operating (see Note 1 below).
zThe EXT pump does not reach 50% of full rotational speed within a preset time after it starts (the time set by
the adjustable Internal Timer: see Sections 1.9.2 and 3.12).
zThe EXT pump speed falls to below 50% of its full rotational speed (see Note 2 below).
zThe EXT pump speed is too high (above 1.07% of full rotational speed).
zThe pump-to-controller cable is disconnected while the EXT pump is operating.
When the Controller trips into Fail condition:
zthe electrical supply to the EXT pump-motor is switched off
zthe TMP Fail status output signal on the logic interface opens and (on the EXC120, EXC300 and EXC300M
Controllers) the Fail LED on the front panel goes on.
zThe operation of the vent-valve and backing pump relay depends on how you have configured the Controller
(refer to Sections 1.8 and 3.13). To reset the Controller after Fail condition, refer to Section 4.9.
Notes: 1. If the Controller trips into Fail condition because the SYS Interlock has opened, the Controller will
switch off the vent-valve electrical supply and (for the EXC120, EXC300 and EXC300M Controllers only)
will open the backing pump relay. The operation of the vent-valve in other Fail conditions depends on
how you have configured the Controller: refer to Sections 1.8 and 3.13.
2. If you enable the Internal Timer (see Sections 1.9.2 and 3.13.2), the Controller will trip into Fail
condition only after the preset time has elapsed.
1.9.2 Internal Timer
Note: The Internal Timer starts when the Controller starts the EXT pump, not when Start is selected (either by
the front-panel button or the logic interface Start/Stop input). For example, if the Start button is pressed
to start the pump when the TMP Interlock is open, the Internal Timer will only start when the Interlock
closes and the Controller starts the pump.
The Internal Timer has two functions:
Firstly, when the EXT pump is started by the Controller, the Internal Timer in the Controller also starts. If the EXT
pump does not reach 50% of full rotational speed within the preset time measured by the timer, the Controller will
trip into Fail condition. This function cannot be disabled.
Secondly, you can configure the Controller to enable or disable the Internal Timer if the pump speed falls during
pump operation:
zIf you disable the Internal Timer, the Controller will trip into Fail condition as soon as the pump speed falls
to below 50% of full rotational speed.
zIf you enable the Internal Timer, the Internal Timer will start as soon as the pump speed falls to below 50% of
full rotational speed; the Controller will trip into Fail condition if the pump speed is still below 50% of full
rotational speed at the end of the preset time.
The Controller is supplied with the Internal Timer enabled and adjusted for a preset time of 8 minutes. You can adjust
the timer for your application: refer to Section 3.12.

D396-14-880 Issue J
Page 12 © Edwards Limited 2008. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
1.9.3 Axial Emergency (EXC300M only)
The EXT250M pump has sensors which detect the axial displacement of the pump rotor; the outputs of these sensors
are monitored by the Controller.
The Controller trips into Axial Emergency condition if:
zThe displacement of the rotor exceeds set limits for more than 2 seconds.
zThe displacement of the rotor repeatedly exceeds set limits (due to oscillation).
When the Controller trips into Axial Emergency condition, the electrical supply to the pump-motor is switched off,
the Emergency LED on the front panel goes on and the Axial Emergency status output signal on the logic interface
opens. The EXT250M pump electromagnetic bearings remain active, although the rotor assembly may contact the
safety bearings if the axial loading exceeds the capabilities of the bearing drive.
1.10 Electrical connections
All electrical connections to the Controller are on the rear panel: see Figures 3to 5.