Edwards EXC 100E User manual

D396-20-880
Issue H
Original Instructions
Instruction Manual
EXC100E and EXC100L Turbomolecular
Pump Controllers
Description Item Number
EXC100E Turbomolecular Pump Controller D396-20-000
EXC100L Turbomolecular Pump Controller D396-22-000

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
EXC100L D396-22-000
EXC100E D396-20-000
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
EN61326-1:2013 Electrical equipment for measurement, control and laboratory
(Class B Emissions, Use. EMC requirements. General requirements
Basic Immunity)
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.
19.08.2015, Eastbourne
Larry Marini, Senior Technical Manage
r
Date and Place
P200-02-380 Issue E

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Contents
D396-20-880 Issue H
Contents
Section Page
1 Introduction .......................................................................................1
1.1 Scope and definitions ................................................................................................... 1
1.2 Description ................................................................................................................ 2
1.3 Connection of an Active Gauge ........................................................................................ 2
1.4 Logic interface ........................................................................................................... 3
1.4.1 Introduction ..............................................................................................................3
1.4.2 Electrical supplies .......................................................................................................3
1.4.3 Control inputs ............................................................................................................3
1.4.4 Status outputs ............................................................................................................4
1.4.5 Analogue output ......................................................................................................... 4
1.5 Vent-valve control ....................................................................................................... 4
1.5.1 Introduction ..............................................................................................................4
1.5.2 Vent on Stop ..............................................................................................................5
1.5.3 Vent on Fail ............................................................................................................... 5
1.6 Controller Fail conditions ............................................................................................... 5
1.6.1 General .................................................................................................................... 5
1.6.2 Internal Timer ............................................................................................................6
2 Technical data ....................................................................................9
2.1 Operating and storage conditions ..................................................................................... 9
2.2 Mechanical data .......................................................................................................... 9
2.3 Electrical data ............................................................................................................ 9
2.4 EXT pump electrical output data .....................................................................................10
2.5 Logic interface ..........................................................................................................10
2.6 Factory settings .........................................................................................................11
2.7 Electrical connectors ...................................................................................................11
3 Installation ....................................................................................... 13
3.1 Unpack and inspect .....................................................................................................13
3.2 Configure the Controller ...............................................................................................13
3.2.1 Introduction .............................................................................................................13
3.2.2 Select speed or power analogue output .............................................................................13
3.2.3 Enable/disable the Internal Timer to monitor low pump speed .................................................14
3.2.4 Vent options .............................................................................................................14
3.3 Fit the Controller .......................................................................................................16
3.4 Introduction to Controller electrical connections .................................................................16
3.5 Connect the electrical supply .........................................................................................18
3.6 Connect additional earth (ground) bonding (if required) .........................................................18
3.7 Connect the EXT pump .................................................................................................18
3.8 Connect an AIM Active Inverted Magnetron gauge (optional) ....................................................19
3.9 Connect the logic interface to your equipment ....................................................................19
3.9.1 Introduction .............................................................................................................19
3.9.2 Connect a vacuum gauge to the logic interface ...................................................................19
3.10 Adjust the Normal speed ..............................................................................................20
3.11 Adjust the Internal Timer .............................................................................................20
4 Operation ........................................................................................ 23
4.1 Start-up ..................................................................................................................23
4.2 Standby ...................................................................................................................23
4.3 Operation with high inlet pressure ...................................................................................23
4.4 Operation with high pump temperature ............................................................................23
dcs/7692/07/15

D396-20-880 Issue H
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Contents
4.5 Normal shutdown .......................................................................................................24
4.6 Automatic shutdown after Fail condition ...........................................................................24
4.7 Reset the Controller after Fail condition ...........................................................................24
4.8 Electrical supply failure ...............................................................................................24
5 Maintenance ..................................................................................... 25
5.1 Safety .....................................................................................................................25
5.2 Replace a fuse ...........................................................................................................25
5.2.1 Introduction .............................................................................................................25
5.2.2 Replace the electrical supply fuse ...................................................................................25
5.3 Clean the Controller ....................................................................................................25
5.4 Fault finding .............................................................................................................25
6 Storage and disposal ........................................................................... 27
6.1 Storage ...................................................................................................................27
6.2 Disposal ...................................................................................................................27
7 Service and accessories ........................................................................ 29
7.1 Introduction .............................................................................................................29
7.2 Service ....................................................................................................................29
7.3 Accessories ...............................................................................................................29
7.3.1 Electrical supply cable .................................................................................................29
7.3.2 Pump-to-controller cable ..............................................................................................30
7.3.3 BX bakeout band ........................................................................................................30
7.3.4 TAV vent-valve ..........................................................................................................30
7.3.5 ACX air-cooler ...........................................................................................................31
7.3.6 Active vacuum gauges ..................................................................................................31
8 Engineering diagrams .......................................................................... 33
For return of equipment, complete the HS Forms at the end of this manual.
Illustrations
Figure Page
1 Rear panel of the Controller (EXC100E shown) ..................................................................... 7
2 Dimensions (mm): EXC100E shown ...................................................................................12
3 Reconfigure the Controller (EXC100L shown) ......................................................................15
4 Schematic diagram of Controller electrical connections .........................................................17
5 Reconfigure the Controller (EXC100L shown) ......................................................................21
6 EXC Controller to EXT pump connections ...........................................................................34
7 Active gauge connector pins ..........................................................................................35

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Contents
D396-20-880 Issue H
Tables
Table Page
1 Operating and storage conditions ..................................................................................... 9
2 Mechanical data .......................................................................................................... 9
3 Electrical data ............................................................................................................ 9
4 EXT pump electrical output data .....................................................................................10
5 Logic interface data ....................................................................................................10
6 Factory settings .........................................................................................................11
7 Electrical connectors ...................................................................................................11
8 Configuration links ......................................................................................................13
9 Selection of vent-valve control options .............................................................................14
10 Logic interface pins ....................................................................................................16
11 Electrical supply cable wires ..........................................................................................18
12 APG to logic interface connections ..................................................................................19
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

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D396-20-880 Issue H
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Introduction
D396-20-880 Issue H
1Introduction
1.1 Scope and definitions
This manual provides installation, operation and maintenance instructions for the EXC100E and EXC100L
Turbomolecular Pump Controllers. 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 and CAUTIONS is defined
below.
CAUTION
Cautions are given where failure to observe the instruction could result in damage to the equipment, associated
equipment and process
The units used throughout this manual conform to the SI international system of units of measurement.
The following warning symbols appear on the Controller:
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.
Direct current only.

D396-20-880 Issue H
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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. Refer to Section 2.4 for compatible EXT pumps.
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 switched to the
phase-windings of the pump-motor . 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. The Controller uses the regenerative supply to maintain the electrical supplies to the vent-valve,
air-cooler and AIM gauge (if connected) until the pump speed falls to below 50% of full rotational speed (see
Section 1.5.2).
The Controllers have a number of control features which limit the power supplied to the EXT pump in the event of
sustained high pressure or temperature:
If 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; this depends on how you have configured
the Controller (see Section 1.6.2).
If 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; this depends on how you have configured the Controller (seeSection 1.6.2).
The Controller has no front-panel controls and can only be operated through the logic interface. To operate the EXT
pump, you must therefore connect the Controller to your own control equipment. Alternatively, you can configure
the mating-plug for the logic interface connector so that the EXT pump starts to operate as soon as the electrical
supply to the Controller is switched on: refer to Section 3.9.
The rear-panel of the Controller has a Normal LED (Figure 1, item 6). The LED is on whenever the TMP Normal status
output signal is low: refer to Section 1.4.4.
The EXC100L Controller has an integral pump-to-controller cable. The EXC100E Controller has a mating connector
suitable for a pump-to-controller cable accessory (not supplied): refer to Section 7.3.2.
1.3 Connection of an Active Gauge
Note: The Controller contains a regenerative power supply which maintains the electrical supply tothe AIM gauge
in the event of a failure of the external electrical supply to the Controller (see Section 1.2).
You can connect an Edwards AIM Active Inverted Magnetron Gauge directly to the active gauge connector on the
Controller 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 3.8 for details about how to connect an AIM gauge
to the Controller.
If you want to use another type of gauge, you must connect the gauge to the Controller through the logic interface:
refer to Section 3.9.

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Introduction
D396-20-880 Issue H
1.4 Logic interface
1.4.1 Introduction
The rear panel of the Controller has a 15-way logic interface connector (Figure 1, item 4) which you can use to
connect the Controller to your own equipment.
Signals on the logic interface are of four types:
Refer to Table 10 and to Figure 4 for detailed information about the logic interface pins and their uses. A general
description of the logic interface connections follows.
1.4.2 Electrical supplies
Two nominal 24 V supplies are provided, as described below:
1.4.3 Control inputs
You can use these inputs to control the operation of the EXT pump. The input signals are switch-type signals; you link
(close) two pins on the logic interface when you want to set the required signal and you do not link (open) the pins
when you do not want to set the signal. The input signals are as follows:
Electrical supplies These are electrical supplies for optional accessories connected to your pump,
such as the vent-valve and the air-cooler.
Control inputs These are switch-type input signals which are used to control the operation of the
EXT pump.
Status outputs These output signals identify the status of the pump and the Controller.
Analogue output The Controller can be configured to provide a speed output or a power output.
This output gives an indication of the EXT pump speed or power consumption.
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. You can also configure the Controller to operate the valve in other specific conditions: refer to
Sections 1.5 and 3.2.
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. Alternatively, 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.
Start/Stop Use the Start/Stop input to Start and Stop the EXT pump. To Start the pump, you must close the
Start/Stop input. To Stop the pump, you must open the input (refer to Sections 4.1 and 4.5).
Standby Close the Standby input to select pump Standby (refer to Section 4.2).

D396-20-880 Issue H
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Introduction
1.4.4 Status outputs
The Controller provides Normal, Fail and Pump On status output signals (TMP Normal, TMP Fail and TMP On) through
open collector transistor outputs on the logic interface connector. These signals can be used to control devices in
the pumping system or to provide remote status output signals. The signals operate as described below.
1.4.5 Analogue output
The Controller has a single analogue output signal, which can be configured to indicate either Pump Speed or Pump
Power consumption.
The Controller is supplied configured so that the 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 a preset EXT pump speed).
If required, you can configure the Controller so that the analogue output signal is proportional to the electrical power
drawn by the EXT pump (see Sections 2.5 and 3.2.2). Connect the output to a suitable meter or indicator to display
the pump power or connect the output to your control equipment.
1.5 Vent-valve control
1.5.1 Introduction
Note: The factory settings for vent options are shown in Table 9.
If the Controller electrical supply fails, the Controller maintains the electricalsupply to the vent-valve until the pump
speed falls to below 50% of full rotational speed, then the Controller switches off the vent-valve electrical supply.
This feature of the Controller cannot be reconfigured.
However, you can use theconfiguration links in the Controller (refer to Section 3.2.4) to select a combination of vent
options in response to the Stop input signal and the TMP Fail output signal.
When a selected vent option condition is detected, the Controller:
waits approximately two seconds, to allow a vacuum system isolation-valve (if fitted) to close,
then switches off the electrical supply to the vent-valve.
TMP Normal TMP Normal is normally high and goes low when the EXT pump reaches its ‘Normal’ speed.
The Normal speed is determined by a potentiometer on the side of the Controller. The
Controller is supplied with the potentiometer adjusted so that Normal speed is 80% of full
rotational speed. You can adjust the Normal speed as described in Section 3.10. The Normal
LED on the rear panel of the Controller (Figure 1, item 6) is on when the TMP Normal signal
is low.
TMP Fail TMP Fail is normally low and goes high when the Controller trips into a Fail condition (see
Section 1.6).
TMP On The TMP On signal mimics the operation of the vent-valve. If you select Vent On Stop (see
Section 1.5.2), TMP On is normally high and goes low when the electrical supply to the EXT
pump is switched on by the Controller.

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Introduction
D396-20-880 Issue H
1.5.2 Vent on Stop
If Vent on Stop is selected when you switch the Controller on, the vent-valve electrical supply remains off until Start
is selected. When Start is selected, the Controller switches the vent-valve electrical supply on. If Stop is then
selected, the Controller switches the vent-valve electrical supply off again.
If Vent on Stop is not selected when you switch the Controller on, the vent-valve electrical supply remains off until
Start is selected. When Start is selected, the Controller switches the vent-valve electrical supply on. If Stop is then
selected, the EXT pump will decelerate and the vent-valve electrical supply will remain on until the pump speed falls
to below 50% of full rotational speed; the vent-valve electrical supply will then be switched off.
1.5.3 Vent on Fail
If Vent on Fail is selected, then the setting of the Vent on Stop option determines how the vent-valve is controlled
in response to a Fail condition, as follows:
If you have selected Vent on Stop and a failure occurs, the Controller switches the vent-valve electrical
supply off approximately two seconds after the Fail condition is detected.
If you have not selected Vent on Stop, the EXT pump will decelerate and the vent-valve electrical supply will
remain on until the pump speed falls to below 50% of full rotational speed; the vent-valve electrical supply
will then be switched off.
If you have not selected Vent on Fail, the electrical supply to the vent-valve will not be switched off when a Fail
condition is detected.
1.6 Controller Fail conditions
1.6.1 General
Note: If you enable the Internal Timer (see Sections 1.6.2 and 3.2.3), the Controller will trip into Fail condition
only after the preset time has elapsed.
The Controller will trip into Fail condition if either of the following occurs:
The 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 1.6.2 and 3.2.3).
The EXT pump speed falls to below 50% of its full rotational speed.
When the Controller trips into Fail condition, the electrical supply to the EXT pump-motor is switched off and the
TMP Fail status output signal on the logic interface goes high. The operation of the vent-valve depends on how you
have configured the Controller (refer to Sections 1.5 and 3.2). To reset the Controller after a Fail condition has
occurred, refer to Section 4.7.

D396-20-880 Issue H
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Introduction
1.6.2 Internal Timer
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:
If 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.
If 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 eight minutes. You can
adjust the timer for your application: refer to Section 3.11.

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Introduction
D396-20-880 Issue H
Figure 1 - Rear panel of the Controller (EXC100E shown)
1. Electrical supply connector
2. Earth (ground) stud
3. EXT pump connector 1
1EXC100E only; the EXC100L has an
integral pump-to-controller cable
4. Logic interface connector
5. Active gauge connector
6. Normal LED

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Technical data
D396-20-880 Issue H
2Technicaldata
2.1 Operating and storage conditions
2.2 Mechanical data
2.3 Electrical data
Table 1 - Operating and storage conditions
Ambient operating temperature range 0 to 40 °C
Ambient storage temperature range -20 to 70 °C
Maximum ambient operating humidity 10 to 95% RH (non-condensing to DIN 40040)
Maximum operating altitude 3000 m
Cooling Natural convection
Table 2 - Mechanical data
Dimensions See Figure 2
Mass
EXC100E 0.8 kg
EXC100L 1.0 kg
Enclosure protection IP20
Pollution degree EN61010, category 2
Table 3 - Electrical data
Electrical supply
Voltage 90 to 264 V a.c., single-phase
Frequency 47 to 63 Hz
Maximum input power 220 VA
Peak inrush current 11 A at 110 V a.c.
40 A at 240 V a.c.
Fuse rating 2 A, type T 20 mm
Over-voltage transients EN61010, category 2

D396-20-880 Issue H
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Technical data
2.4 EXT pump electrical output data
2.5 Logic interface
Table 4 - EXT pump electrical output data
Compatible EXT pumps EXT70, EXT250, EXT351
Maximum continuous output power 80 W
Maximum output voltage 53 V a.c. r.m.s.
Switching frequency 32 kHz
Nominal output frequency 600 Hz to 1.5 kHz
Maximum output frequency 1.07 x nominal
Standby frequency 70% of nominal
Table 5 - Logic interface data
Remote control signals
Control voltage: low (close) < 0.8 V d.c.
Control voltage: high (open) 4 to 24 V d.c.
Maximum input current (at 24 V) 80 A
Maximum output current (at 0 V d.c.) 160 A
Air-cooler electrical supply
Voltage range +20 to +26 V d.c.
Maximum output current 150 mA
Vent-valve electrical supply
Voltage range +16 to +26 V d.c.
Maximum output current 80 mA
Analogue output
Output voltage 0 to +10 V d.c. proportional to speed or power:
0 to 10 V 0 to 100% of pump speed, or
0 to 10 V 0 to 80 W motor power
Maximum output current 5 mA
TMP Normal and TMP Fail status outputs
Maximum output voltage (high) 26 V d.c.
Maximum output current
Vout (low) 0.8 V 20 mA
Vout (low) < 0.8 V (TTL level) 1 mA
TMP On status output
Logic high output voltage at 8 A4.12V
Logic low output voltage at 42 A0.77V

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Technical data
D396-20-880 Issue H
2.6 Factory settings
2.7 Electrical connectors
Note: Do not connect voltages greater than 45 V to the logic interface. If you do, the Controller will not comply
with the low voltage safety recommendations of IEC 1010.
Table 6 - Factory settings
Normal speed 80%
Internal Timer 8 min, enabled
Vent options See Table 9
Analogue output Speed output
Table 7 - Electrical connectors
Electrical supply connector socket type CEE/IEC 320
Earth (ground) stud (on rear panel) M4
Active gauge connector
Signals on the connector pins See Figure 6 and Table 11
Socket type FCC68, 8-way
Manufacturer Western Electric
Maximum power 3 W
Logic interface connector 15-way sub-miniature ‘D’ type socket

D396-20-880 Issue H
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Technical data
Figure 2 - Dimensions (mm): EXC100E shown
A. Rear view
B. Top view
C. Side view
1. Clearance for ventilation
2. Clearance for cables
3. Optional mounting plate

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Installation
D396-20-880 Issue H
3 Installation
3.1 Unpack and inspect
Remove all packing materials and check the Controller. If the Controller is damaged, notify your supplier and the
carrier in writing within three days; state the Item Number of the Controller together with your order number and
your supplier’s invoice number. Retain all packing materials for inspection. Do not use the Controller if it is damaged.
If the Controller is not to be used immediately, store the Controller in suitable conditions, as described in Section 6.1.
3.2 Configure the Controller
3.2.1 Introduction
The Controller has four links which can be used to configure the Controller for your application: see Table 8. Each
link can be in one of two positions as shown in Figure 3 and described in Sections 3.2.2 and 3.2.4.
If you want to reconfigure the Controller, undo and remove the two screws (Figure 3, items 1) and remove the top
cover (2) of the Controller to access the links. Use the links as described in the following sections.
3.2.2 Select speed or power analogue output
Note: The Controller is supplied with link LK1 configured to provide the pump speed analogue output signal on
the logic interface.
Refer to Figure 3. To select the pump speed analogue output signal on the logic interface, insert link LK1 in the upper
position (5).
To select the pump power analogue output signal on the logic interface, insert link LK1 in the lower position (6).
Table 8 - Configuration links
Link Use
LK1 Select speed or power analogue output
LK4 Enable or disable the Internal Timer
LK5 Select Vent on Stop or no Vent on Stop
LK6 Select Vent on Fail or no Vent on Fail

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Installation
3.2.3 Enable/disable the Internal Timer to monitor low pump speed
Notes: 1. If you pump a high gas load when the Internal Timer is enabled (link LK4 in the enabled position:
Figure 3, item 12), the EXT pump may stall before the Controller trips into Fail condition. Ensure that
oil which backstreams from the backing pipeline will not adversely affect your process. Disable the
Internal Timer to provide the greatest protection against backstreaming if a Fail condition occurs.
2. The Controller is supplied with the Internal Timer enabled.
Set link LK4 to enable or disable the use of the Internal Timer when the pump rotational speed falls to below 50% of
full rotational speed during operation (see Section 1.6.2):
Insert link LK4 in the active position (Figure 3, item 12) to enable the Timer.
The Internal Timer will then start as soon as the pump rotational speed falls to below 50% of full rotational
speed. If the pump speed remains below 50% of full rotational speed after the preset time, the Controller
will trip into the Fail condition.
Insert link LK4 in the not active position (Figure 3, item 11) to disable the Timer.
The Controller will then trip into the Fail condition as soon as the pump rotational speed falls to below 50%
of full rotational speed.
3.2.4 Vent options
Links LK5 and LK6 are used to select the vent-valve control options (refer to Section 1.5). Each of the links can be in
one of two positions: the link not active position and the link active position. Position the links to select the required
vent options as shown in Table 9.
Note however, that if the electrical supply to the Controller fails, the Controller will always switch off the electrical
supply to the vent-valve when the EXT pump speed falls to below 50% of full speed (see Section 1.6.1).
Table 9 - Selection of vent-valve control options
Link positions Vent options
LK6 (Vent on Fail) LK5 (Vent on Stop)
not active not active Vent when the EXT pump speed falls to 50% of
full speed after Stop is selected or a Fail
condition is detected.
not active active Vent on Stop; vent when the EXT pump speed
falls to 50% of full speed after a Fail condition is
detected.
active *
*Link positions as supplied.
not active *Vent on Fail; vent when the EXT pump speed
falls to 50% of full speed after Stop is selected.
active active Vent on Fail and vent on Stop.