Woodward AtlasPC User manual

Hardware Manual
AtlasPC™ Digital Control
Volume 1
Manual 85586 consists of 2 volumes (85586V1 & 85586V2).
Manual 85586V1 (Revision P)

DEFINITIONS
This is the safety alert symbol. It is used to alert you to potential personal
injury hazards. Obey all safety messages that follow this symbol to avoid
possible injury or death.
•DANGER—Indicates a hazardous situation which, if not avoided, will result in death
or serious injury.
•WARNING—Indicates a hazardous situation which, if not avoided, could result in
death or serious injury.
•CAUTION—Indicates a hazardous situation which, if not avoided, could result in
minor or moderate injury.
•NOTICE—Indicates a hazard that could result in property damage only (including
damage to the control).
•IMPORTANT—Designates an operating tip or maintenance suggestion.
The engine, turbine, or other type of prime mover should be equipped with an
overspeed shutdown device to protect against runaway or damage to the prime
mover with possible personal injury, loss of life, or property damage.
The overspeed shutdown device must be totally independent of the prime mover
control system. An overtemperature or overpressure shutdown device may also
be needed for safety, as appropriate.
Read this entire manual and all other publications pertaining to the work to be performed before
installing, operating, or servicing this equipment. Practice all plant and safety instructions and
precautions. Failure to follow instructions can cause personal injury and/or property damage.
This publication may have been revised o
r
updated since this copy was produced. To verify that
you have the latest revision, be sure to check the Woodward website:
www.woodward.com/pubs/current.pdf
The revision level is shown at the bottom of the front cover after the publication number. The latest
version of most publications is available at:
www.woodward.com/publications
If your publication is not there, please contact your customer service representative to get the
latest copy.
Any unauthorized modifications to or use of this equipment outside its specified mechanical,
electrical, or other operating limits may cause personal injury and/or property damage, including
damage to the equipment. Any such unauthorized modifications: (i) constitute "misuse" and/or
"negligence" within the meaning of the product warranty thereby excluding warranty coverage
for any resulting damage, and (ii) invalidate product certifications or listings.
To prevent damage to a control system that uses an alternator or batter
y
-charging
device, make sure the charging device is turned off before disconnecting the battery
from the system.
To prevent damage to electronic components caused by improper handling, read
and observe the precautions in Woodward manual 82715, Guide for Handling and
Protection of Electronic Controls, Printed Circuit Boards, and Modules.
Revisions—Text changes are indicated by a black line alongside the text.
Woodward Governor Company reserves the right to update any portion of this publication at any time. Information
provided by Woodward Governor Company is believed to be correct and reliable. However, no responsibility is assumed
by Woodward Governor Company unless otherwise expressly undertaken.
© Woodward 2000
All Rights Reserved

Manual 85586V1 AtlasPC Digital Control, Vol. I
Woodward i
Contents
Volume I contains all AtlasPC™ hardware information except the
detailed Distributed I/O information, which is in Volume II.
ELECTROSTATIC DISCHARGE AWARENESS .................................................. V
CHAPTER 1. GENERAL INFORMATION........................................................... 1
Introduction.............................................................................................................1
AtlasPC Control Description...................................................................................1
Control Versions .....................................................................................................2
Control Accessories................................................................................................3
Regulatory Compliance ..........................................................................................3
Regulatory Compliance Specifications...................................................................4
CHAPTER 2. INSTALLATION.......................................................................... 6
Introduction.............................................................................................................6
General Installation.................................................................................................6
Shipping Carton......................................................................................................6
Mounting.................................................................................................................6
Environmental Specifications .................................................................................7
Electrical Connections ............................................................................................7
Grounding...............................................................................................................9
Input Power ..........................................................................................................11
Maintenance .........................................................................................................13
CHAPTER 3. POWER SUPPLY BOARDS....................................................... 14
General Description..............................................................................................14
Specifications .......................................................................................................15
Troubleshooting Guide .........................................................................................16
CHAPTER 4. PENTIUM CPU BOARD ........................................................... 18
General Description..............................................................................................18
Hardware Specifications.......................................................................................18
CPU Interface Connections..................................................................................19
CHAPTER 5. SMARTCORE BOARD WITHOUT ACTUATORS ........................... 23
General Description..............................................................................................23
Specifications .......................................................................................................25
AtlasPC SmartCore Board Operation...................................................................27
Troubleshooting Guide .........................................................................................39
CHAPTER 6. SMARTCORE BOARD WITH ACTUATORS ................................. 42
General Description..............................................................................................42
Specifications .......................................................................................................44
SmartCore Board Operation.................................................................................47
Troubleshooting Guide .........................................................................................59
CHAPTER 7. ANALOG COMBO BOARD ....................................................... 62
General Description..............................................................................................62
Specifications .......................................................................................................63
AtlasPC Analog Combo Board Operation ............................................................68
Troubleshooting Guide .........................................................................................73

AtlasPC Digital Control, Vol. I Manual 85586V1
ii Woodward
Contents
CHAPTER 8. POWERSENSE BOARD............................................................75
General Description..............................................................................................75
Features................................................................................................................75
Physical ................................................................................................................75
Hazardous Live.....................................................................................................75
Specifications........................................................................................................79
PowerSense Board Operation..............................................................................82
Power Calculations...............................................................................................90
Troubleshooting Guide .........................................................................................97
CHAPTER 9. 12-CHANNEL RELAY MODULE ................................................99
General Information..............................................................................................99
Relay Information................................................................................................100
Shielding .............................................................................................................100
Board Status Lights ............................................................................................100
Wiring..................................................................................................................100
CHAPTER 10. DLE SERIAL COMMUNICATIONS BOARD..............................102
General Information............................................................................................102
Application Developer Information......................................................................105
CHAPTER 11. SERVICE OPTIONS..............................................................106
Product Service Options.....................................................................................106
Woodward Factory Servicing Options ................................................................107
Returning Equipment for Repair .........................................................................108
Replacement Parts .............................................................................................108
Engineering Services..........................................................................................109
How to Contact Woodward.................................................................................109
Technical Assistance..........................................................................................110
APPENDIX A. ACRONYMS AND GLOSSARY OF TERMS ...............................111
Acronyms............................................................................................................111
Glossary of Terms ..............................................................................................112
APPENDIX B. WIRING DIAGRAMS..............................................................113
APPENDIX C. FLASH CODES ....................................................................119
APPENDIX D. BOARD ADDRESSES............................................................121
DECLARATIONS .......................................................................................123

Manual 85586V1 AtlasPC Digital Control, Vol. I
Woodward iii
Illustrations and Tables
Figure 1-1. AtlasPC Module Layout .......................................................................2
Figure 1-2. Physical Dimensions............................................................................5
Figure 2-1. Spring Clamp .......................................................................................8
Figure 2-2. Fixed Terminals....................................................................................9
Figure 3-1a. Power Supply Board Connections (5503-216) ................................14
Figure 3-1b. AtlasPC Power Supply Board (601-1008) .......................................15
Figure 3-2. Discrete Output Wiring Example........................................................17
Figure 4-1. Pentium CPU Board Connections......................................................20
Figure 5-1. SmartCore Board Connections ..........................................................23
Figure 5-2. SmartCore Board Block Diagram.......................................................24
Figure 5-3. Minimum MPU Voltage Graph ...........................................................26
Figure 5-4. Wiring Example–MPU Interface to the SmartCore Board .................28
Figure 5-5. Wiring Example–Proximity Probe to the SmartCore Board ...............29
Figure 5-6a. Wiring Example–4–20 mA Input Interface to the SmartCore Board 30
Figure 5-6b. Wiring Example–4–20 mA Input Interface using External Loop
Power...............................................................................................30
Figure 5-7. Wiring Example–0–5 V Input Interface to the SmartCore Board .......30
Figure 5-8. Wiring Example–Analog Output Interface to the SmartCore Board ..31
Figure 5-9. Wiring Example–Discrete Input Interface to the SmartCore Board ...32
Figure 5-10. Serial #1–RS-232 Pinouts................................................................33
Figure 5-11. Serial #1–RS-422 Pinouts................................................................33
Figure 5-12. Serial #1–RS-485 Pinouts................................................................34
Figure 5-13. Serial #2–RS-232 Pinouts................................................................34
Figure 5-14. Serial #2–RS-422 Pinouts................................................................35
Figure 5-15. Serial #2–RS-485 Pinouts................................................................35
Figure 5-16. Serial #3–RS-232 Pinouts................................................................36
Figure 5-17. Wiring Example–RS-232 Interface to the SmartCore Board ...........36
Figure 5-18. Wiring Example–RS-422 Interface to the SmartCore Board ...........36
Figure 5-19. Wiring Example–RS-485 Interface to the SmartCore Board ...........36
Figure 5-20. Wiring Example–Alternate Multipoint Wiring....................................37
Figure 6-1. SmartCore Board with Actuators, Connectors...................................42
Figure 6-2. AtlasPC SmartCore Board Block Diagram ........................................43
Figure 6-3. Wiring Example–MPU Interface to the SmartCore Board .................47
Figure 6-4. Wiring Example–Proximity Probe to the SmartCore Board ...............48
Figure 6-5a. Wiring Example–4–20 mA Input Interface to the SmartCore Board 49
Figure 6-5b. Wiring Example–4–20 mA Input Interface using External Loop
Power...............................................................................................49
Figure 6-6. Wiring Example–0–5 V Input Interface to the SmartCore Board .......49
Figure 6-7. Wiring Example–Analog Output Interface to the SmartCore Board ..50
Figure 6-8. Wiring Example–Actuator Output Interface to the SmartCore Board 51
Figure 6-9. Wiring Example–Discrete Input Interface to the SmartCore Board ...52
Figure 6-10. Serial #1–RS-232 Pinouts................................................................53
Figure 6-11. Serial #1–RS-422 Pinouts................................................................53
Figure 6-12. Serial #1–RS-485 Pinouts................................................................54
Figure 6-13. Serial #2–RS-232 Pinouts................................................................54
Figure 6-14. Serial #2–RS-422 Pinouts................................................................55
Figure 6-15. Serial #2–RS-485 Pinouts................................................................55
Figure 6-16. Serial #3–RS-232 Pinouts................................................................56
Figure 6-17. Wiring Example–RS-232 Interface to the SmartCore Board ...........56
Figure 6-18. Wiring Example–RS-422 Interface to the SmartCore Board ...........56
Figure 6-19. Wiring Example–RS-485 Interface to the SmartCore Board ...........57
Figure 6-20. Wiring Example–Alternate Multipoint Wiring....................................57
Figure 7-1. AtlasPC Analog Combo Board Connections .....................................62
Figure 7-2. AtlasPC Analog Combo Board Block Diagram ..................................63
Figure 7-3. Minimum MPU Voltage ......................................................................67

AtlasPC Digital Control, Vol. I Manual 85586V1
iv Woodward
Illustrations and Tables
Figure 7-4. Wiring Example–MPU Interface to the Analog Combo Board ...........68
Figure 7-5a. Wiring Example–Analog Input Interface...........................................69
Figure 7-5b. Wiring Example–Analog Input Interface with External Loop Power 70
Figure 7-6. Wiring Example–4–20 mA Input Interface .........................................70
Figure 7-7. Wiring Example–RTD Input Interface ................................................70
Figure 7-8. Wiring Example–Analog Output Interface..........................................72
Figure 8-1. Terminal Block Covers .......................................................................76
Figure 8-2. PowerSense Board Connections .......................................................77
Figure 8-3. PowerSense Board Block Diagram....................................................78
Figure 8-4. Wiring Example–Wye Connected System .........................................84
Figure 8-5. Wiring Example–Wye Connected System .........................................85
Figure 8-6. Example Wiring–Wye Connected System .........................................86
Figure 8-7. Wiring Example–Delta Connected System ........................................87
Figure 8-8. Wiring Example–Delta Connected System ........................................88
Figure 8-9. Wiring Example–CT Interface to the PowerSense Board..................91
Figure 8-10. Wiring Example–CT Interface to the PowerSense Board................92
Figure 8-11. Wiring Example–Speed Bias Output Interface ................................93
Figure 8-12. Wiring Example–Speed Bias Output Interface ................................94
Figure 8-13. Wiring Example–Voltage Bias Output Interface...............................95
Figure 8-14. Wiring Example–Voltage Bias Output Interface...............................95
Figure 8-15. Wiring Example–LON Interface to the PowerSense Board .............96
Figure 9-1. 12-Channel Relay Module .................................................................99
Figure 9-2. 12-Channel Relay Module Wiring Diagram......................................101
Figure 10-1. DLE Connections ...........................................................................102
Figure 10-2. Terminator Locations .....................................................................103
Figure B-1. SmartCore Board without Actuators Connections...........................113
Figure B-2. SmartCore Board with Actuators Connections................................114
Figure B-3. Analog Combo Board Connections .................................................115
Figure B-4. PowerSense Board Connections.....................................................116
Figure B-5. 12-Channel Relay Module Connections ..........................................117
Figure B-6. DLE Connections.............................................................................118
Figure D-1. Board Address Numbers .................................................................121
Table 1-1. AtlasPC Modules...................................................................................2
Table 2-1. Power Supply Requirements...............................................................12
Table 4-1. Ethernet Port Pinout ............................................................................21
Table 4-2. Pentium COM Port Pinout...................................................................22
Table 5-1. SmartCore Failure Codes....................................................................38
Table 6-1. SmartCore Failure Codes....................................................................58
Table 7-1 Analog Combo Failure..........................................................................73
Table 8-1. PowerSense Failure Codes ................................................................96
Table 10-1. DLE Failure Codes ..........................................................................104
Table C-1. SmartCore without Actuators Failure Codes ....................................119
Table C-2. SmartCore with Actuators Failure Codes .........................................119
Table C-3 Analog Combo Failure Codes ...........................................................119
Table C-4. PowerSense Failure Codes..............................................................120
Table C-5. DLE Failure Codes ...........................................................................120

Manual 85586V1 AtlasPC Digital Control, Vol. I
Woodward v
Electrostatic Discharge Awareness
All electronic equipment is static-sensitive, some components more than others.
To protect these components from static damage, you must take special
precautions to minimize or eliminate electrostatic discharges.
Follow these precautions when working with or near the control.
1. Before doing maintenance on the electronic control, discharge the static
electricity on your body to ground by touching and holding a grounded metal
object (pipes, cabinets, equipment, etc.).
2. Avoid the build-up of static electricity on your body by not wearing clothing
made of synthetic materials. Wear cotton or cotton-blend materials as much
as possible because these do not store static electric charges as much as
synthetics.
3. Keep plastic, vinyl, and Styrofoam materials (such as plastic or Styrofoam
cups, cup holders, cigarette packages, cellophane wrappers, vinyl books or
folders, plastic bottles, and plastic ash trays) away from the control, the
modules, and the work area as much as possible.
4. Do not remove the printed circuit board (PCB) from the control cabinet
unless absolutely necessary. If you must remove the PCB from the control
cabinet, follow these precautions:
•Do not touch any part of the PCB except the edges.
•Do not touch the electrical conductors, the connectors, or the
components with conductive devices or with your hands.
•When replacing a PCB, keep the new PCB in the plastic antistatic
protective bag it comes in until you are ready to install it. Immediately
after removing the old PCB from the control cabinet, place it in the
antistatic protective bag.
To prevent damage to electronic components caused by improper
handling, read and observe the precautions in Woodward manual
82715, Guide for Handling and Protection of Electronic Controls,
Printed Circuit Boards, and Modules.

AtlasPC Digital Control, Vol. I Manual 85586V1
vi Woodward

Manual 85586V1 AtlasPC Digital Control, Vol. I
Woodward 1
Chapter 1.
General Information
Introduction
This manual describes the Woodward AtlasPC™ Digital Control. It provides a
variety of useful information for the user ranging from simple basic descriptions to
detailed information on wiring, specifications, and functionality. Included are:
•General information on the AtlasPC platform and available versions
•A physical description of the control hardware
•A description of all AtlasPC modules
•A listing of accessories that may be used with the platform
•Information on AtlasPC communications and distributed I/O interfaces
•Installation and maintenance
•Troubleshooting information
•For information on programming, networking, and communication protocols,
refer to the software manual provided with the control.
AtlasPC Control Description
The AtlasPC digital control platform fits a wide range of prime mover
applications. These include small mechanical-drive units with a minimum of
complexity on up to large two-shaft gas turbine generator sets that require unit
sequencing and load control. The AtlasPC control is programmed to the specific
needs of the prime mover and its driven load.
At the heart of the AtlasPC control is a 32-bit microprocessor that runs a powerful
Real Time Operating System. This operating system is specifically designed to
control the proper timing of all application code so that dynamic performance of
the final control system is absolutely guaranteed. Each piece of the application
code is “scheduled” under a Rate Group structure that ensures execution of the
code at a predetermined time.
Application programming is accomplished via Woodward’s GAP™ Graphical
Application Program. GAP is a pictures-to-code system that provides a high-level
programming environment for users who have control expertise but do not have
specific programming skills. Once the application program has been generated
and loaded into the AtlasPC control, the user can view variables and tune the
control with a variety of Woodward service tools. Connection to other devices,
such as an HMI, is accomplished by means of serial Modbus®* or Ethernet ports
on the control. The desired information flow is programmed into the control via
GAP. If required, distributed I/O can be connected using optional communication
modules that support Profibus, DeviceNet, and Ethernet protocols.
*—Modbus is a trademark of Schneider Automation Inc.
The hardware platform is based on the industry-standard PC/104 bus structure.
In the AtlasPC control, the backplane is the SmartCore board. The PC/104
modules are “stacked” onto the SmartCore board in order to add I/O or other
functionality. Each of the stacked modules has an on-board DIP switch that is
positioned to the unique address of that particular module. The AtlasPC control
uses a second stack called the Power Bus Stack. This stack is used primarily for
power-related I/O. The control runs on low-voltage dc power (18–32 Vdc).
AtlasPC field wiring is accomplished via terminal blocks that plug into the control
modules.

AtlasPC Digital Control, Vol. I Manual 85586V1
2 Woodward
Control Versions
The AtlasPC control provides a flexible platform that can be structured into a
wide variety of configurations of I/O and communications. The required number
of I/O modules and the types of communication modules that are required will
depend entirely on the specific application scenario. Table 1-1 shows the various
modules that are available.
I/O Modules
Processor & Communication
Modules
SmartCore Profibus
PowerSense DeviceNet
Analog I/O Dual Ethernet
Power Supply Pentium CPU
Table 1-1. AtlasPC Modules
Figure 1-1 shows diagrammatically the physical arrangement of the modules in
the AtlasPC control hardware. The hardware uses two stacked-bus
arrangements to provide the required structure. The Power Bus Stack is used for
the power-related I/O as well as the discrete output drivers. The PC/104 Stack is
used primarily for the signal I/O, the main processor, and communications
modules. All configurations contain a SmartCore module that spans both the
Power Bus Stack and the PC/104 Stack. If real power sensing is required in the
application, a PowerSense module is stacked above the SmartCore module and
also spans both bus stacks. If a PowerSense module is not specified, then an
additional Analog I/O module can be substituted. Figure 1-1 shows a “maximum”
configuration.
Figure 1-1. AtlasPC Module Layout

Manual 85586V1 AtlasPC Digital Control, Vol. I
Woodward 3
Control Accessories
The AtlasPC digital control platform is designed to interface with several
Woodward service tools and commercial software products. Available tools are
listed below with a brief description of their functionality:
•Watch Window—Provides an Ethernet or serial connection to the control to
allow 1) initial configuration of the unit; 2) monitoring and tuning of system
variables; and 3) management of configuration and setpoints.
•Control Assistant—Ethernet connection to the control for viewing of high-
speed data captures and other useful utilities.
•Application Manager—Ethernet access to the control for program loading,
network configuration and support, and system diagnostics.
•HMI (Human Machine Interface)—Commercially available HMI programs
interface to the AtlasPC control through Ethernet or serial connections to
provide operator access and control of the application machinery.
Regulatory Compliance
The AtlasPC™ control is suitable for use in Class I, Division 2, Groups A, B, C,
D, per UL for Canada and US or non-hazardous locations only.
The AtlasPC control is suitable for use in European Zone 2, Group IIC
environments when installed in an IP-54 minimum rated enclosure per DEMKO
certification.
Wiring must be in accordance with North American Class I, Division 2 or
European Zone 2 wiring methods as applicable, and in accordance with the
authority having jurisdiction.
Field wiring must be suitable for at least 75 °C for operating ambient
temperatures expected to exceed 50 °C.
A fixed wiring installation is required.
Do not connect more than one main power supply to any one fuse or circuit
breaker.
Connect ground screw to earth ground (see Figure 1-2).
These listings are limited to those units bearing the UL or DEMKO agency
identifications.
EXPLOSION HAZARD—Do not connect or disconnect while circuit is
live unless area is known to be non-hazardous.
Substitution of components may impair suitability for Class I,
Division 2 or Zone 2 applications.
Ne pas raccorder ni débrancher tant que l’installation est
sous tension, sauf en cas l’ambiance est décidément non
dangereuse.
La substitution de composants peut rendre ce matériel
inacceptable pour les emplacements de Classe I, Division 2
ou Zone 2.

AtlasPC Digital Control, Vol. I Manual 85586V1
4 Woodward
Some degraded performance can occur on RTD and thermocouple
inputs in the presence of radiated energy from transmitters such as
cell phones. This degraded performance is in the form of a slight
change in the accuracy of the measured temperature. It is
recommended that operation of such devices be kept more than 3 m
from the AtlasPC control. This will prevent any degradation.
Installation of the AtlasPC control in a metal enclosure will also
prevent any degradation.
Regulatory Compliance Specifications
European Compliance for CE Mark
EMC Directive Declared to 89/336/EEC COUNCIL DIRECTIVE
of 03 May 1989 on the approximation of the laws
of the Member States relating to electromagnetic
compatibility.
Low Voltage Directive Declared to 73/23/EEC COUNCIL DIRECTIVE
of 10 February 1973 on the harmonization of the
laws of the Member States relating to electrical
equipment designed for use within certain
voltage limits.
ATEX—Potentially Declared to 94/9/EEC COUNCIL DIRECTIVE of
Explosive Atmospheres 23 March 1994 on the approximation of the laws
Directive of the Member States concerning equipment
and protective systems intended for use in
potentially explosive atmospheres.
Other European Compliance
DEMKO Certified to EN50021, Zone 2: EEx nL IIC 02
ATEX 0220460U
North American Compliance
UL UL Listed for Class I, Division 2, Groups A, B, C,
& D, T4A at 70 °C ambient. For use in Canada
and the United States.
These listings are limited to those units bearing the UL or DEMKO agency
identification.
Marine Compliance
American Bureau of ABS Rules 2003 SVR 4-2-1/7.3, 7.5.1, 7.9.3/17,
Shipping 4-9-4/23, 4-9-7/Table 9
Det Norske Veritas Standard for Certification No. 2.4, 2001:
Temperature Class B, Humidity Class B,
Vibration Class C, and EMC Class A
Lloyd’s Register of Shipping LR Type Approval Test Specification No. 1,
2002 for Environmental Categories ENV1,
ENV2, and ENV3

Manual 85586V1 AtlasPC Digital Control, Vol. I
Woodward 5
Figure 1-2. Physical Dimensions
(dimensions shown are in inches)

AtlasPC Digital Control, Vol. I Manual 85586V1
6 Woodward
Chapter 2.
Installation
Introduction
This chapter provides the general information for mounting location selection,
installation, and wiring of the AtlasPC™ control. Hardware dimensions, ratings,
and requirements are given for mounting and wiring the control in a specific
application.
General Installation
When selecting a location for mounting the AtlasPC control, consider the
following:
•Protect the unit from direct exposure to water or to a condensation-prone
environment.
•The operating range of the AtlasPC control is –20 to +70 °C
(–4 to +158 °F).
•Provide adequate ventilation for cooling. Shield the unit from radiant heat
sources.
•Do not install near high-voltage or high-current devices.
•Allow adequate space around the unit for servicing and wiring.
•Do not install where objects can be dropped on the terminals.
•Ground the chassis for proper safety and shielding.
•When installing on a generator set package, provide vibration isolation.
Shipping Carton
Before unpacking the control, refer to the inside front cover and page vi of this
manual for WARNINGS and NOTICES. Be careful when unpacking the control.
Check for signs of damage such as bent or dented panels, scratches, loose or
broken parts. If any damage is found, immediately notify the shipper.
The AtlasPC control was shipped from the factory in an anti-static foam lined
carton. This carton should always be used for transport of the control when it is
not installed.
Mounting
Figure 1-2 shows the AtlasPC control layout and mounting pattern. The AtlasPC
digital control is to be mounted in an appropriate enclosure for the installed
environment. This equipment is designed for installation within a control room
panel or cabinet. An IP-54 minimum rated enclosure is required for European
Zone 2 applications (per EN50021).

Manual 85586V1 AtlasPC Digital Control, Vol. I
Woodward 7
The standard AtlasPC package must be mounted to allow sufficient room for
wiring access. Eight front panel mounting holes permit secure mounting.
Depending on its configuration, the AtlasPC weighs between 3.4 and 4.5 kg (7.5
and 10 pounds), and has an operating range of –20 to +70 °C ambient air
temperature. A minimum of 25 mm (1 inch) of clear space around the outer
surfaces of the AtlasPC is adequate for ventilation, however approximately 75
mm (3 inches) of space may be required for wiring, depending on wire size.
Environmental Specifications
Operating Temperature
The AtlasPC Control Platform operates in a specified ambient temperature of
–20 to +70 °C (–4 to +158 °F) with forced convection cooling. When Profibus,
DeviceNet, CanOpen, or dual Ethernet is used, the operating temperature is
limited to –20 to +60 °C (–4 to +140 °F).
Continuous operation with insufficient airflow or higher operating
temperatures will lead to reduced reliability and possible damage to
the control.
Storage Temperature
The AtlasPC Control Platform is designed to be stored without applied power at
the temperature range of –40 to +85 °C (–40 to +185 °F).
Shock
The AtlasPC Control Platform was designed to meet the shock requirements
specified by MIL-STD-810C procedure 516.2, procedure 1 (30g, 11 millisecond
half sine pulse). During Shock, relay bounce shall be limited to less than 100 ms.
Vibration (Sinusoidal)
The AtlasPC Control Platform was tested to Lloyd’s Test Specification No. 1,
2002, Vibration Test 1 (5–13.2 Hz, ±1 mm; 13.2–100 Hz, ±0.7g).
Audible Noise Emission
The AtlasPC Control Platform does not emit an audible noise above 70 dBA as
measured 1 meter away, with or without a fan.
Enclosure Protection
In order to meet Zone 2 European Group IIC, the AtlasPC Control must be
mounted in an enclosure that meets or exceeds IP 54.
Electrical Connections
Most inputs and outputs to the AtlasPC control are made through
“CageClamp” terminal blocks. For noise suppression, it is recommend that
all low-current wires be separated from all high-current wire.
The pluggable terminal blocks on the I/O modules are screwless CageClamp
style blocks. The spring clamp can be actuated by using a standard 2.5 mm (3/32
inch) flat bladed screwdriver (see Figure 2-1). The AtlasPC pluggable terminal
blocks accept wires from 0.08–1.1 mm² (28–18 AWG). Two 0.5 mm² (20 AWG)
wires or three 0.3 mm² (22 AWG) wires can be easily installed in each terminal.
Wires for the pluggable I/O terminals should be stripped 8 mm (0.3 inch).

AtlasPC Digital Control, Vol. I Manual 85586V1
8 Woodward
Most of the AtlasPC control’s terminal blocks are designed to be removed by
hand. After AtlasPC input power is disconnected, the terminal blocks can be
removed one at a time by pulling them straight out. Be careful not to pull the plug
out at an angle, as this will fracture the end terminal.
Method #1 Method #2
Free Hand (holds spring open) Bench (momentarily opens
spring while force is applied)
Figure 2-1. Spring Clamp
The AtlasPC fixed terminal blocks used for the power supply input accept wires
from 0.08–1.1 mm² (28–18 AWG). Two 0.5 mm² (20 AWG) wires or three 0.3
mm² (22 AWG) wires can be easily installed in each terminal. Wires for the fixed
mounted power terminals should be stripped 5 mm (0.2 inch).
Wiring Fixed Terminal
Do not tin (solder) the wires that terminate at the AtlasPC terminal
blocks. The spring-loaded CageClamp terminal blocks are designed
to flatten stranded wire, and if those strands are tinned together, the
connection loses surface area and is degraded.
All ac wiring for voltages and currents is done with fixed screw barrier blocks
rather than pluggable terminal blocks. The fixed screw barrier blocks accept
wires terminated into terminal lugs for #6 screws.

Manual 85586V1 AtlasPC Digital Control, Vol. I
Woodward 9
Figure 2-2. Fixed Terminals
Grounding
Protective Earth (PE) must be connected to the termination point on the backside
of the unit next to the label with the symbol to reduce the risk of electric
shock. This connection will be made using a thread-forming screw (M4 x 6 mm).
The conductor providing the connection shall have a properly sized ring lug and
wire larger than or equal to 3.3 mm² (12 AWG).
Recommended Grounding Practices
Providing the proper ground for the AtlasPC control is important. Improper
connection of the control chassis to the ground plane may lead to stray currents
between the reference point for the ac signal sources (current and voltage
transformers), and the reference point for the sensing inputs on the AtlasPC
control. Differences in potential between these two points results in equalizing
current flow which then produces unacceptably high common mode voltages.
Common mode voltages may result in improper readings for the sensed ac
inputs, or even damage to the AtlasPC control in extreme cases. To minimize
this problem, it is necessary to provide a low resistance path between the ac
signal reference point, and the chassis of the AtlasPC control. Typically this point
is the designated ground for the generator set and related instrument
transformers.

AtlasPC Digital Control, Vol. I Manual 85586V1
10 Woodward
Shields and Grounding
An individual shield termination is provided at the terminal block for each of the
signals requiring shielding. These include all sensor wiring and ac signal inputs.
Relay outputs, contact inputs, and power supply wiring do not normally require
shielding, but can be shielded if desired. All shielded cable must be twisted
conductor pairs. Do not attempt to tin (solder) the braided shield. All signal lines
should be shielded to prevent picking up stray signals from adjacent equipment.
Wire exposed beyond the shield should be as short as possible, not exceeding
50 mm (2 inches). The other end of the shields must be left open and insulated
from any other conductor.
The AtlasPC control is designed for shield termination to earth ground at the
control. If intervening terminal blocks are used in routing a signal, the shield
should be continued through the terminal block. If shield grounding is desired at
the terminal block, it should be ac coupled to earth. All other shield terminations
except at the AtlasPC control should be ac coupled to earth through a capacitor.
A 1000 pF, 500 V capacitor is sufficient. The intent is to provide a low impedance
path to earth for the shield at frequencies of 150 kHz and up. Multiple direct
connections of a shield to earth risk high levels of current to flow within the
shield. See Woodward application note 50532, Interference Control in Electronic
Governing Systems, for more information.
Where shielded cable is required, cut the cable to the desired length and prepare
the cable as instructed below.
1. Strip outer insulation from both ends, exposing the braided or spiral wrapped
shield. Do not cut the shield.
2. Using a sharp, pointed tool, carefully spread the strands of the shield.
3. Pull inner conductor(s) out of the shield. If the shield is the braided type, twist
it to prevent fraying.
4. Remove 6 mm (1/4 inch) of insulation from the inner conductors.
5. Connect wiring and shield as shown in plant wiring diagram.
For noise suppression reasons, it is recommend that all low-current wires be
separated from all high-current wires. Input power ground terminal should also be
wired to earth ground. Installations with severe electromagnetic interference
(EMI) may require additional shielding precautions, such as wire run in conduit or
double shielding. Contact Woodward for more information.
Shields can be grounded at both ends (AtlasPC control and load) if the cable
length is sufficiently short (within a cabinet) to prevent ground loop current in the
shield.
Cabinet Installations: If the AtlasPC control is installed in a cabinet, shielded I/O
can be terminated directly to the cabinet (earth ground) at the entry to the
cabinet, as well as at the control.

Manual 85586V1 AtlasPC Digital Control, Vol. I
Woodward 11
Input Power
The AtlasPC control requires a nominal voltage source of 18 to 32 Vdc. Input
power requirements vary depending on the control version. Table 2-1 contains
information for the maximum configuration.
Power must be applied to the AtlasPC control at least 60 seconds
prior to expected use. The control must have time to do its power up
diagnostics to become operational. Failure of the diagnostics will
disable control function.
The AtlasPC power supply board must have the input power
removed before installing or removing.
This equipment is suitable for use in Class 1, Division 2, Groups A,
B, C, and D, or non-hazardous locations only.
Wiring must be in accordance with Class I, Division 2 wiring methods
and in accordance with the authority having jurisdiction.
Do not connect more than one main power supply to any one fuse or
circuit breaker.
Power supply output must be of a low impedance type for proper operation of the
control. DO NOT power a control from a high voltage source containing dropping
resistors and zener diodes. If batteries are used for operating power, an
alternator or other battery charging device is necessary to maintain a stable
supply voltage.
Significant inrush currents are possible when current is applied to the AtlasPC
control. The magnitude of the inrush current depends on the power source
impedance, so Woodward cannot specify the maximum inrush current. Time-
delay fuses or circuit breakers must be used to avoid nuisance trips.
Input Power Wiring
Protective earth ground (PE) must be connected to the chassis at the termination
point on the back side labeled with . The power supply grounding
terminals should also be connected to earth to ensure grounding of the power
supply printed circuit boards. The grounding conductor must be the same size as
the main supply conductors or the PT wires, whichever is larger.
Note that the control’s power supplies are not equipped with input power
switches. For this reason, some means of disconnecting input power to each
main power supply must be provided for installation and servicing.

AtlasPC Digital Control, Vol. I Manual 85586V1
12 Woodward
It is expected that the installation of this equipment will include over current
protection between the power source and the AtlasPC control. This over current
protection may be accomplished by series connection of properly rated fuses or
circuit breakers. Branch circuit protection of no more than 250% of the maximum
AtlasPC power supply input current rating must be provided. See Table 2-1 for
maximum recommended fuse ratings. This value meets the 250% UL listing
requirements. The use of properly sized UL class CC, J, T, G, RK1, or RK5 fuses
meet the requirements for branch circuit protection. Do not connect more than
one AtlasPC control to any one fuse. Use only the wire size specified in Table
2-1 or equivalent metric size which meets local code requirements. Time delay
fuses should be used to prevent nuisance trips.
Table 2-1 provides the power supply holdup time specification; which is the time
the supply will continue to operate within specification after its input power is
interrupted. This information may be useful in specifying uninterruptible power
supply (UPS) systems.
Input Voltage
Range
Fuse
(Current Rating) Fuse (I2t Rating) Wire Size* ** Holdup Time
18–32 Vdc** 9 A >800 2/4 mm²
12/14 AWG
8 ms
Table 2-1. Power Supply Requirements
* 4 mm² (12 AWG) is the largest wire gauge size that may be
connected to the control power input terminal blocks.
** The minimum input voltage allowed is 18 V at the power input of
the control. The length, size of wire, and load current will determine
the minimum supply output voltage. The minimum supply voltage
measured at the source should always be greater than 18 V.
Example: two (source and return) 20 foot (6 m) lengths of 14 AWG (2
mm²) wire carrying 1.2 A (maximum rated current) will result in a
voltage drop from source output to control power input of approx.
0.16 volts. The resulting supply voltage from the example must be
greater than 18.16 volts.
Input Power Wiring Diagram
The power supply and ground connections are located on the power supply
board.
AtlasPC
Power Supply Board 3
2
1
Common
System
Ground
24V
Optional
+
-
Switching
Power
Supply