Pickering 40-914 User manual

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Issue 6.3 July 2023
40-914 User Manual
PXI 14-Slot Chassis

Page (II) 14-SLOT PXI CHASSIS 40-914
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Page (II) REED RELAY MODULE 40-110/115/120/125
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© COPYRIGHT (2023) PICKERING INTERFACES. ALL RIGHTS RESERVED.
No part of this publication may be reproduced, transmitted, transcribed, translated or stored in any form, or by
any means without the written permission of Pickering Interfaces.
Technical details contained within this publication are subject to change without notice.
ISO 9001
Reg No. FM38792

Page (III)
14-SLOT PXI CHASSIS 40-914
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Page (III)
REED RELAY MODULE 40-110/115/120/125
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TECHNICAL SUPPORT
For Technical Support please contact Pickering Interfaces either by phone, the website or via e-mail.
WARRANTY
All products manufactured by Pickering Interfaces are warranted against defective materials and workmanship for a period of
three years, excluding programmable power supplies, from the date of delivery to the original purchaser. Any product found to be
defective within this period will, at the discretion of Pickering Interfaces be repaired or replaced.
Products serviced and repaired outside of the warranty period are warranted for ninety days.
Extended warranty and service are available. Please contact Pickering Interfaces by phone, the website or via e-mail.
ENVIRONMENTAL POLICY
Pickering Interfaces operates under an environmental management system similar to ISO 14001.
Pickering Interfaces strives to full all relevant environmental laws and regulations and reduce wastes and releases to the
environment. Pickering Interfaces aims to design and operate products in a way that protects the environment and the health and
safety of its employees, customers and the public. Pickering Interfaces endeavours to develop and manufacture products that can
be produced, distributed, used and recycled, or disposed of, in a safe and environmentally friendly manner.
Worldwide Technical Support and Product Information
pickeringtest.com
Germany
Tel: [phone]
E-mail: [email protected]
Sweden
Tel: [phone]
E-mail: [email protected]
USA
Tel: (West) [phone]
Tel: (East) [phone]
E-mail: [email protected]
Czech Republic
Tel: [phone]
E-mail: [email protected]
France
Tel [phone]
E-mail [email protected]
Pickering Interfaces Headquarters
Stephenson Road Clacton-on-Sea CO15 4NL United Kingdom
Tel: [phone]
E-Mail: [email protected]
China
Tel: [phone]
E-mail: [email protected]

Page (IV) 14-SLOT PXI CHASSIS 40-914
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Page (IV) REED RELAY MODULE 40-110/115/120/125
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MEANING / DESCRIPTION SYMBOL
PROTECTIVE EARTH (GROUND)
To identify any terminal which is intended for connection to an external conductor for
protection against electric shock in case of a fault, or the terminal of a protective earth
(ground) electrode.
DANGEROUS VOLTAGE
To indicate hazards arising from dangerous voltages.
WARNING / CAUTION
An appropriate safety instruction should be followed or caution to a potential hazard
exists.
Refer to the relevant instructions detailed within the product manual.
HEAVY
If this product is heavy reference should be made to the safety instructions for
provisions of lifting and moving.
STATIC SENSITIVE
To indicate that static sensitive devices are present and handling precautions should
be followed.
!
kg
SAFETY SYMBOLS
PRODUCT SAFETY
The following safety symbols may be used on the product and throughout the product documentation.

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14-SLOT PXI CHASSIS 40-914
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Copyright Statement ...................................................................II
Technical Support and Warranty................................................III
Product Safety .............................................................................IV
Contents (this page)....................................................................V
Warnings and Cautions ..............................................................VII
Section 1
Technical Specication...............................................................1.1
Section 2
Technical Description .................................................................2.1
Backplane...............................................................................2.1
Power Supply.........................................................................2.3
Mechanical .............................................................................2.4
Section 3
Installation and Operation ..........................................................3.1
Getting Started.......................................................................3.1
Installing The Chassis...........................................................3.2
Fan Speed Setting .................................................................3.3
Installing & Identifying a PXI Chassis in NI MAX ................. 3.5
Installation of Individual Modules........................................3.5
Section 4
Maintenance.................................................................................4.1
CONTENTS

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Page (VII)
14-SLOT PXI CHASSIS 40-914
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WARNINGS AND CAUTIONS
WARNING - HAZARDOUS ENVIRONMENTS SYMBOL
This product is not specically designed for use in hazardous environments, for example in explosive
atmospheres. If the product is to be used in hazardous environments we recommend that the user
ensures suitable protective measures are taken.
!
WARNING - DANGER OF ELECTRIC SHOCK SYMBOL
This chassis may be populated with modules that contain hazardous voltages. Before removing any
module from the rack remove all supplies and disconnect user I/O signals.
Unused slots in this chassis are populated with blanking plates to prevent access to user I/O signals
that may be present. Blanking panels are available to order from Pickering in a variety of slot widths.
If the product is not used in this manner for example by using an extender card then additional care
must be taken to avoid contact with exposed signals.
CAUTION - HANDLING OF ELECTROSTATIC-SENSITIVE DEVICES SYMBOL
Certain semiconductor devices used in this equipment are liable to damage due to static voltage.
Observe the following precautions when handling these devices in their unterminated state, or
sub-assemblies containing these devices:
1. Persons removing sub-assemblies from equipment using these devices must be earthed by a
wrist strap and a resistor at the point provided on the equipment.
2. Soldering irons used during the repair operations must be low voltage types with earthed tips and
isolated from the mains voltage by a double insulated transformer.
3. Outer clothing worn must be unable to generate static charges.
4. Printed Circuit Boards (PCBs) tted with these devices must be stored and transported in
anti-static bags.
CAUTION - PRODUCT DOCUMENTATION SYMBOL
Suitably qualied & trained users should ensure that the accompanying documentation is fully read
and understood before attempting to install or operate the product.
!
SAFETY INSTRUCTIONS
SAFETY INSTRUCTIONS
All cleaning and servicing requires the equipment to be isolated and disconnected from the power source and user I/O
signals (refer to the Maintenance Section).
• Appropriate manual handling procedures should be followed as dictated by the weight of the individual module or
the combined weight of the modules & chassis.
• Should a fault occur with the module or chassis, immediately isolate and disconnect the incoming power to the
chassis and the user I/O signals.
• Ensure the equipment is installed, operated and maintained by trained and authorised personnel.
• For suitably equipped products in the event of an emergency press the red “emergency stop” button situated on
the front of the unit.

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Page 1.1
14-SLOT PXI CHASSIS 40-914
pickering SECTION 1 - TECHNICAL SPECIFICATION
SECTION 1 - TECHNICAL SPECIFICATION
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PXI High Performance Mainframe, 14 Slot 40-914
ISSUE 6.3 JUL 2023
yHigh Performance 14 Slot PXI/cPCI
Backplane
yDual Modular Supplies
yCompact Benchtop Footprint
yLow Profile 4U Rugged Design
yVoltage Monitoring Included
yPower Supplies Hot Swap
Capable
yLow Audible Operating Noise
Versions Available
y3 Year Warranty
Pickering Interfaces’ 40-914 PXI Chassis features an
industry-standard, fourteen-slot PXI/cPCI backplane
integrated into a 3U cardcage.
The 41-914 includes all the features and performance
required by the PXI standard and supports a control
interface or embedded controller and up to 13 additional
3U peripheral modules.
It can be controlled from a PC using Pickering Interfaces
PCI to PXI Control Interface 41-921.
The 40-914 chassis is provided with two removable
modular power supplies on the left of the chassis. Power
supply voltage status and fault monitoring is via front
panel LEDs. Replacement power supply modules are
available from Pickering.
Four 56 cfm fans (total 224 cfm) ensure maximum cooling
with minimal noise. Quick filter media and fan maintanence
is provided by a removable fan tray.
For applications such as office or laboratory environments
where acoustic noise levels are critical, the chassis can
be supplied with either lower speed fans or with fans
whose speed can be set to full, medium or slow with easily
accessed internal switches.
Pickering’s Range of PXI & PXIe Chassis
Chassis Type Slots Chassis Size Model No.
PXI 8 4U Full Rack 40-908
PXI 14 4U Full Rack 40-914
PXI 19 4U Full Rack 40-923A
PXI 8 4U Half Rack 40-924
PXIe Hybrid (Gen 3) 8 4U Half Rack 42-924
PXIe Hybrid (Gen 3) 18 4U Full Rack 42-925
PXIe Hybrid (Gen 2) 18 4U Full Rack 42-926
PXI with LXI Control* 7 4U Half Rack 60-102D
PXI with LXI Control* 18 4U Full Rack 60-103D
PXI with LXI/USB Control 2 1U Half Rack 60-104
PXI with LXI/USB Control 4 2U Half Rack 60-105
PXI with LXI/USB Control* 6 1U Full Rack 60-106
*Includes Scan List Sequencing and optional Triggering function.

Page 1.2 14-SLOT PXI CHASSIS 40-914
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SECTION 1 - TECHNICAL SPECIFICATION
PXI 14-Slot Mainframe, 40-914
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Specifications & Ordering Information
Operating/Storage Conditions
Operating Conditions
Operating Temperature:
Humidity:
Altitude:
0 °C to +55 °C
Up to 95 % non-condensing
5000 m
Storage and Transport Conditions
Storage Temperature:
Humidity:
Altitude:
-20 °C to +70 °C
Up to 95 % non-condensing
15000 m
Safety & CE Compliance
All modules are fully CE compliant and meet applicable EU
directives: Low-voltage safety EN61010-1:2001,
EMC Immunity EN61000-6-1:2001,
Emissions EN55011:1998.
Product Order Codes
14-Slot, 3U, 350 W PXI Chassis 40-914-001
Chassis with 3 speed fans 40-914-101
Chassis with low noise fans 40-914-201
PCI to PXI Control Interface Kit 41-921-001-KIT
(for full details of our fast PCI to PXI control Interface
see the 41-921 data sheet).
Accessories
Replacement Power Supply Module 44-910-004
Specifications
Chassis
Backplane:
Incorporates all the features of the
PXI specification. The backplane
is 64-bit with PXI triggers, Star
Trigger, Local Bus & internal PXI
clock.
Cooling
Airflow:
Fans:
Acoustic Noise:
Air Filter:
Low Acoustic
Noise
Versions:
Bottom intake, side/rear exhaust,
pressurized cardcage.
4 off 55 cfm fans (224 cfm total).
56.5 - 58.2 dB @ 1 m
(A weighting).
Bottom accessible, washable media.
Available with selectable fan speed
(3 speeds set by internal switches).
Available with low noise fans.
Power Supply
Input Voltage
Range:
Cooling:
90 - 264 VAC, universal input,
Line Fuse protected.
Convection, with chassis forced air.
Supplied with two 175 W power supplies (Type 59102)
with the following total capacity:
DC Outputs
+3.3 V
+5 V
+12 V
-12 V
Dual Supplies
50 A
50 A
6 A
2 A
Note: Combined 3.3 V and 5 V current, 54 A Maximum.
Power Factor:
Efficiency:
0.99 (typical).
70 % (typical).
Power Supply Monitoring
Interface:
Functions:
Indicators:
Front panel LED indicators.
Power supply DC output voltage
verification (90 % nominal).
Green LEDs for Power OK,
Red LED for Fault.
Mechanical Specification
Cardcage: Front loading 3U x 160 mm, flush,
14 slots, IEEE 1101.1, 1101.10 and
1101.11
Dimensions: Depth: 257.8 mm (10.53”)
Width: 442.2 mm (17.41”)
without rack mount flanges.
Width: 482.6 mm (19.00”)
with rack mount flanges.
Height: 177 mm (6.97”)
Weight: 8.5 kg (18.6 lbs) without PXI modules

Page 1.3
14-SLOT PXI CHASSIS 40-914
pickering SECTION 1 - TECHNICAL SPECIFICATION
PXI 14-Slot Mainframe, 40-914
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Supporting Products & Software
We also offer customized cabling and have a free online Cable Design Tool
that can be used to create custom cable solutions for many applications.
Visit: pickeringtest.com/cdt to start your design.
Mass Interconnect
We recommend the use of a mass interconnect solution when an
Interchangeable Test Adapter (ITA) is required for a PXI or LXI based
test system. Our modules are fully supported by both Virginia Panel and
MacPanel.
Pickering Reed Relays
We are the only switch provider with in-house reed relay manufacturing
capability via our Relay Division. These instrument grade reed relays
feature SoftCenter™ technology, ensuring long service life and repeatable
contact performance.
To learn more, please go to: pickeringrelay.com
Connectivity Solutions
We provide a full range of supporting cable and connector solutions for all our switching products—20 connector families
with 1200+ products. We offer everything from simple mating connectors to complex cables assemblies and terminal
blocks. All assemblies are manufactured by Pickering and are guaranteed to mechanically and electrically mate to our
modules.
Connectors & Backshells Multiway Cable Assemblies RF Cable Assemblies Connector Blocks
Programming
Pickering provide kernel, IVI and VISA (NI & Keysight) drivers which are compatible with all Microsoft supported versions of
Windows and popular older versions. For a list of all supporting operating systems, please see: pickeringtest.com/os
The VISA driver support is provided for LabVIEW Real Time Operating Systems (Pharlap and Linux-RT). For other RTOS
support contact Pickering. These drivers may be used with a variety of programming environments and applications
including:
• Pickering Interfaces Switch Path Manager
• National Instruments products (LabVIEW, LabWindows/CVI, Switch Executive, MAX, TestStand, VeriStand, etc.)
• Microsoft Visual Studio products (Visual Basic, Visual C++)
• Programming Languages C, C++, C#, Python
• Keysight VEE and OpenTAP
• Mathworks Matlab
• Marvin ATEasy
• MTQ Testsolutions Tecap Test & Measurement Suite
Drivers for popular Linux distributions are available, other environments are also supported, please contact Pickering
with specific enquiries. We provide Soft Front Panels (SFPs) for our products for familiarity and manual control, as well as
comprehensive documentation and example programs to help you develop test routines with ease.
To learn more about software drivers and development environments, please go to: pickeringtest.com/software

Page 1.4 14-SLOT PXI CHASSIS 40-914
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SECTION 1 - TECHNICAL SPECIFICATION
PXI 14-Slot Mainframe, 40-914
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Supporting Products & Software
© Copyright (2023) Pickering Interfaces. All Rights Reserved Pickering Interfaces maintains a commitment to continuous product development, consequently we reserve the right to vary from the description given in this data sheet.
Signal Routing Software
Our signal routing software, Switch Path Manager, automatically selects and energizes
switch paths through Pickering switching systems. Signal routing is performed by simply
defining test system endpoints to be connected together, greatly accelerating Test System
software development.
To learn more, please go to: pickeringtest.com/spm
Diagnostic Relay Test Tools
eBIRST Switching System Test Tools are designed specifically for our PXI, PCI
or LXI products, these tools simplify switching system fault-finding by quickly
testing the system and graphically identifying the faulty relay.
To learn more, please go to: pickeringtest.com/ebirst
Three Year Warranty & Guaranteed Long-Term Support
All standard products manufactured by Pickering Interfaces are warranted against defective materials and workmanship
for a period of three years from the date of delivery to the original purchaser. Extended warranty and service agreements
are available for all our modules and systems with various levels to suit your requirements. Although we offer a 3-year
warranty as standard, we also include guaranteed long-term support—with a history of supporting our products for typically
15-20 years. To learn more, please go to: pickeringtest.com/support
Available Product Resources
We have a large library of product resources including success stories, product and support videos, articles and white
papers as well as application specific product brochures to assist when looking for the switching, simulation and connection
solutions you need. We have also published handy reference books on Switching Technology and for the PXI and LXI
standards.
To view, download or request any of our product resources, please visit: pickeringtest.com/resources

Page 2.1
14-SLOT PXI CHASSIS 40-914
pickering SECTION 2 - TECHNICAL DESCRIPTION
SECTION 2 - TECHNICAL DESCRIPTION
BACKPLANE
The 40-914 PXI chassis uses a 14-slot backplane which consists of 1 system slot and 13 peripheral slots (at 33 MHz)
with 20.32 mm (0.8 inch) board center-to-center spacing.
Key Features:
• Compliant with PXI specification R2.1.
• Two ATX sockets and screw terminals for +3.3V, +5V, ±12V DC output connection.
• 10-layer PCB for accurate impedance control.
• ATX socket and screw terminals for DC output connection.
• 64-bit PCI bus on J1 and J2, support N-1 bus-mastering I/O slots (N: Slots).
• System controller slot is located in slot 1.
• Trigger controller slot is located in slot 2, providing individual triggers to all other peripherals.
Interoperability With CompactPCI
The 40-914 backplane is interoperable with PXI-compatible products and standard CompactPCI products. This is an
important feature, as many PXI-compatible systems may not require components that do not implement PXI-specic
features. For example, you may want to use a standard CompactPCI network interface card in a PXI chassis.
The signals on the P1 connector of the backplane meet the requirements of the CompactPCI specication for both
the peripheral and system modules.
The PXI-specic signals are located on P2 and are only found on the signals that are reserved or not used in
the CompactPCI 64-bit specication. Therefore, all modules that meet the requirements of the CompactPCI 64-bit
specication will function in the 40-914.
System Controller Slot
The System Controller slot is located in Slot 1 of the chassis as dened by the PXI specication. It has three
controller expansion slots, which are used for system controller modules that are wider than one slot. As dened
in the PXI specication, these slots allow the controller to expand to the left to prevent the controller from using up
peripheral slots.
Star Trigger Slot
The Star Trigger (ST) slot is located at Slot 2. This slot has a dedicated trigger line between each peripheral slot
(see Figure 2.1). This slot is intended for modules with Star Trigger functionality that can provide individual triggers
to all other peripherals. However, if you do not require advanced trigger functionality, you can install any standard
peripheral module into this slot. Peripheral Slots - there are seven peripheral slots including the Star Trigger controller
slot. The Star Trigger Slot can also accept an external standard to replace the chassis reference clock, PXI_CLK10
supplied by the chassis.
Local Bus
The PXI backplane’s local bus is a daisy-chained bus that connects each peripheral slot with its adjacent peripheral
slots to the left and right, as shown in Figure 2.1.
For example, a given peripheral slot’s right local bus connects to the adjacent slot’s left local bus and so on. Each local
bus is 13 lines wide and can pass analog signals between cards or provide a high-speed side-band communication
path that does not affect the PXI bandwidth.
Local Bus signals may range from high-speed TTL signals to analog signals as high as 42V. Initialization software keys
adjacent boards to prohibit the use of incompatible boards. This software uses the conguration information specic
to each peripheral board to evaluate compatibility. This method is a exible way to dene local bus functionality that
is not limited by hardware keying.
Trigger Bus
The 40-914 includes the 8 trigger bus lines dened in the PXI standard to interconnect the system and peripheral
slots.

Page 2.2 14-SLOT PXI CHASSIS 40-914
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SECTION 2 - TECHNICAL DESCRIPTION
Star Triggers
PCI Arbitration and Clock Signals
Local
Bus
Local
Bus
Local
Bus
Local
Bus
System Controller Slot - [1]
Star Trigger/PeripheralSlot-[2]
Peripheral Slot - [4] Peripheral Slot - [3] Peripheral Slot - [13] Peripheral Slot - [14]
Figure 2.1 - PXI Local Bus and Star Trigger Routing

Page 2.3
14-SLOT PXI CHASSIS 40-914
pickering SECTION 2 - TECHNICAL DESCRIPTION
POWER SUPPLY
The 40-914 uses two hot swappable modular power supplies that have easy access from the front panel. Standard
versions are operated from the supply to the chassis which can be in the range of 90V to 260V AC. Optional power
supplies are DC operated from 36V to 72V (Option 1) or 18V to 36V (Option 2). The power supply modules provide
+5V, +3.3V, +12V and -12V DC to the PXI backplane.
When two power supplies are installed (standard conguration), either one is capable of supplying the entire system
power should the other one fail (providing the total PXI module load does not exceed the power capability of a single
power supply module). Users may insert or remove a redundant power supply from the system without interrupting
the system operation (provided the backplane load can be supplied from one power supply module). However, for
systems where the chassis is fully populated, it is recommended that the system is powered down prior to changing
a power supply.
In the event of failure, replacement power supply modules are available as spare parts from Pickering with the order
code: 44-910-004.
Key Features
• Eurorack-compatible module design
• 110/220V AC input, 175W
• Hot swap with N+1 load sharing
• Remote sense on main output (+5V)
• Efficiency 73%
• Built-in EMI filter
• Over voltage protection
• Short circuit protection on all outputs
• Over temperature protection at 90ºC
• DIN standard input/output connector
• Status LEDs indicate power OK and Fault
• FCC Class B regulations
Power Status Indication
Status LED Indication
Green Input OK
Red Power supply FAULT

Page 2.4 14-SLOT PXI CHASSIS 40-914
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SECTION 2 - TECHNICAL DESCRIPTION
MECHANICAL
Figure 2.2 - Mechanical Drawing For The 40-914-001 PXI Chassis

Page 3.1
14-SLOT PXI CHASSIS 40-914
pickering SECTION 3 - INSTALLATION & OPERATION
SECTION 3 - INSTALLATION AND OPERATION
GETTING STARTED
Unpacking
Carefully remove every item from the shipping container and check the chassis for any damage. Make sure all
handles, hardware, and switches are in good condition. If damage appears, please contact Pickering Interfaces for
service or replacement.
Each PXI chassis contains the following items:
• This manual (printed or on CD)
• 40-914 Chassis with Filler panels
• A power cord (110V/220V alternative)
• Installation CD (includes electronic manuals and chassis.ini files)
Refer to the Warnings and Cautions at the front of this manual
The chassis is designed for indoor use only.
!
Connecting Safety Ground
WARNING
THE 40-923 CHASSIS IS DESIGNED WITH A THREE-POSITION IEC CONNECTOR THAT CONNECTS
THE GROUND LINE TO THE CHASSIS GROUND. TO MINIMIZE SHOCK HAZARD, MAKE SURE YOUR
ELECTRICAL POWER OUTLET HAS AN APPROPRIATE EARTH SAFETY GROUND THAT IS CONNECTED
WHENEVER YOU POWER UP THE CHASSIS.
IF YOUR POWER OUTLET DOES NOT HAVE AN APPROPRIATE GROUND CONNECTION, YOU MUST
CONNECT THE FACTORY WIRE SAFETY GROUND TO THE CHASSIS. TO CONNECT THE SAFETY
GROUND, COMPLETE THE FOLLOWING STEPS:
1. Connect a 16 AWG (1.3 mm) wire to a chassis grounding screw using a toothed grounding lug. The wire must
have green insulation with a yellow stripe or must be non-insulated (bare).
2. Attach the opposite end of the wire to permanent earth ground using toothed washers or a toothed lug.
!

Page 3.2 14-SLOT PXI CHASSIS 40-914
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SECTION 3 - INSTALLATION & OPERATION
Operating Temperature 0~55°C (32~131°F)
Storage Temperature -20~70°C (-40~158°F)
Relative Humidity
(Operating and Storage) 10~95% @ 40°C, non-condensing
Packaged Vibration
5~100Hz: 0.015G²/Hz
100~200Hz: -6 dB/Oct
200 Hz: 0.0038 G²/Hz
Unpackaged Vibration 5~55~5Hz 0.38mm Peak to Peak
Drop Test Falling Height: 76 cm
Falling: 1 corner/3 edges/6 faces
Shock Test (Operating)
Acceleration: 10G
Pulse width: 11ms
Pulse shape: half sine wave
No. of shock: 3 shocks for bottom side
Environment
The 40-914 chassis uses industrial standard mechanical components and high performance connector technologies
to provide an optimized system for rugged applications.
INSTALLING THE CHASSIS
This section includes information on siting the chassis for the most effective cooling, as well as setting the fan
speed and connecting the saftey ground.
Site Considerations
The 40-914 is designed to operate on a bench or in an instrument rack. Determine how you want to use your 40-
914 and follow the appropriate installation instructions.
Apertures in the rear and along both sides of the chassis facilitate power supply and module cooling. As shown
in Figure 2-2, air enters through lters and fan inlets located in the lower rear of the chassis and exits through the
upper sections on both sides and through the rear.
Cooling Considerations
The area above and below the chassis should be kept clear to ensure the inlet and exhaust air paths are not
obstructed. The user should allow at least 0.5 U separation between the top and bottom of the chassis and the
other instruments in the rack.
If the chassis is placed above an instrument that vents hot air from its top cover then a mechanical separator, such
as a tray, should be used to stop the chassis from taking hot air into the chassis
The side and rear air exhausts should be kept clear of obstructions
Ensure that all unused slots in the chassis have ller panels installed, as required by the PXI standard, to ensure
the correct internal air ow.
Ensure the air lter on the bottom of the chassis is correctly installed after cleaning.

Page 3.3
14-SLOT PXI CHASSIS 40-914
pickering SECTION 3 - INSTALLATION & OPERATION
Figure 3.1 - Minimum air gap required at the top and
bottom of the 40-914 chassis.
FAN SPEED SETTING (40-914-101)
The 40-914-101 version of the chassis is tted with 4 fans that can each be set to one of three speed settings. For
ofce and laboratory use it is recommended that the medium speed setting is used. For use in a rack where higher
temperatures may be experienced and fan noise is less of an issue, the speed can be set to high. The low speed
setting should be used with caution in applications where there is low module power dissipation and no risk of the
chassis overheating. The following procedure describes the sequence for changing the fan speed. Note: Figures
3.2 and 3.3 show an 8-slot chassis with 3 fans, the procedure for a 14-slot chassis with 4 fans is basically the same.
1. Turn off power to the chassis and remove all cabling.
2. Place the chassis on its back (with PXI slots facing upwards) to gain access to the underside.
3. Remove the 5 crosshead screws securing the fan tray to the underside of the chassis - as shown in Figure 3.2.
Figure 3.2 - Locations
of the 5 screws
securing the fan tray
to the underside of
the chassis

Page 3.4 14-SLOT PXI CHASSIS 40-914
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SECTION 3 - INSTALLATION & OPERATION
.
4. Carefully lower the fan tray by pivoting it on its lower edge, taking care not to strain the wiring to the fan
assemblies.
Figure 3.3 - Locations
of the 2 fan controller
boards mounted on
the side of the fans
5. Locate the 2 fan controller boards mounted on the side of two of the fans - as shown in Figure 3.3.
6. Referring to the legend on the fan controller boards, set the speed of each fan by removing the link from
its current position and retting it to the required setting (each board controls two fans). The legend on the
controller board is shown in Figure 3.4.
7. Ret the fan tray and secure with the 5 crosshead screws.
8. Return the chassis to its normal orientation, ret all cabling and apply power.
Figure 3.4 - Legend on the fan controller board
with the speed setting links highlighted