Scheidt and Bachmann NVP User Manual
Fare collection
systems
Customer Documentation
State: December 2017
FareGo VAL OV|41
Edit: Stevens Art.#.: 86 -----, Ver. 1.06 Date:13.12.2017
This manual, including all of its component parts, is copyright protected. Scheidt & Bachmann GmbH
reserves all rights to its contents. Any use not expressly approved by copyright law is subject to prior
approval by Scheidt & Bachmann GmbH. This applies particularly to copying, processing, translations and
microfilming, as well as to storage and data processing in any electronic systems.
All contents of this manual shall be treated confidentially and shall not be transferred to any third party, either
for their own commercial use or for any other client.
Since all information and facts are subject to technical changes, any liability for the data contained is hereby
disclaimed. Modifications of technical details, in terms of information and illustrations are reserved. Make
sure to follow the updating index. Scheidt & Bachmann GmbH cannot be held responsible for direct damage
and/or possible consequential damage due to misuse by the customer or by third parties, unless the Product
Liability Act (ProdHaftG) is concerned. In no event shall Scheidt & Bachmann GmbH be liable for any damage out of or in connection with the provision of the manual.
© 2017 Scheidt & Bachmann GmbH, Fare collection system (FCS)
Breite Straße 132 41238 Mönchengladbach
www.scheidt-bachmann.com
Subject to change.
History
Version Date Change Edit
1.00 01.12.2016 Start Version Stevens
1.01 31.03.2017 Reduced the contents of the manual to
OV|41 relevant topics
1.02 03.04.2017 Changes made according to specifications
from the design department
1.03 05.07.2017 Information on radio frequencies added Stevens
1.04 21.08.2017 Changes made according to specifications
from the design department (C.Gerspacher)
1.05 15.09.2017 Changes made according to specifications
from the design department (N.Huendgen.)
1.06 13.12.2017 Changes made according to specifications
from the design department
(N. Huendgen. and I. Izler)
Stevens
Stevens
Stevens
Stevens
Stevens
Table 1-1
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Chapter 1 Introduction and Safety Considerations
1.1 Overview ................................................................................................ 1-7
1.2 Manual Organization............................................................................. 1-7
1.3 Safety ..................................................................................................... 1-8
1.4 General Safety Guide............................................................................ 1-9
1.5 Protective Equipment ......................................................................... 1-10
1.6 Special Tools ....................................................................................... 1-10
1.7 Use of Symbols in Manual.................................................................. 1-10
1.7.1 Warning Symbol ..................................................................................................... 1-10
1.7.2 Caution Symbol ...................................................................................................... 1-10
1.7.3 Information Symbol................................................................................................1-10
1.7.4 Example Symbol..................................................................................................... 1-10
1.7.5 Finger Tip Maintenance Symbol ...........................................................................1-11
1.7.6 Tools Symbol..........................................................................................................1-11
1.7.7 Electrical Hazard Symbol....................................................................................... 1-11
1.7.8 Electrostatic Discharge Symbol............................................................................ 1-11
1.7.9 Hot Hazard Symbol................................................................................................. 1-12
1.7.10 Maintenance Cycle Symbol ................................................................................... 1-12
1.8 Device Safety Labels .......................................................................... 1-12
1.8.1 Labels On the OV|41............................................................................................... 1-13
1.8.1.1 Label Locations .............................................................................................. 1-13
1.8.1.2 CE Label......................................................................................................... 1-14
1.8.1.3 FCC License Label......................................................................................... 1-14
1.8.1.4 TÜV SÜD NRTL Label ...................................................................................1-14
Chapter 2 Glossary
2.1 Glossary of Terms and Abbreviations .............................................. 2-15
Chapter 3 Declaration of Conformity
3.1 Europe.................................................................................................. 3-27
3.2 USA/CANADA ...................................................................................... 3-28
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Chapter 4 Troubleshooting and Module Removal
4.1 Troubleshooting Overview..................................................................4-31
4.1.1 Out of Service ......................................................................................................... 4-31
4.2 Error Identification...............................................................................4-32
4.2.1 Blocked Card ..........................................................................................................4-37
4.2.2 Card Error ............................................................................................................... 4-38
4.2.3 Recovery Scenarios ............................................................................................... 4-45
4.2.3.1 Recovery Scenario 1......................................................................................4-45
4.2.3.2 Recovery Scenario 2......................................................................................4-46
4.3 Verifying Software Versions ...............................................................4-47
4.4 Tools and Consumables .....................................................................4-47
Chapter 5 Preventive Maintenance
5.1 General Maintenance and Cleaning ...................................................5-49
5.2 Preventive Maintenance Schedule Summary....................................5-50
5.3 Materials and Replacement Parts.......................................................5-50
Chapter 6 OV|41 Installation
6.1 Overview ...............................................................................................6-51
6.2 Hardware...............................................................................................6-51
6.3 Dimension and Weight ........................................................................6-51
6.4 Power Requirements ...........................................................................6-51
6.5 Operating Features ..............................................................................6-54
6.5.1 OV|41 Mounting and Environmental Considerations ......................................... 6-54
6.6 Installation Requirements ...................................................................6-55
6.6.1 Materials..................................................................................................................6-55
6.6.2 Standard Tools .......................................................................................................6-55
6.6.3 Special Tools ..........................................................................................................6-55
6.7 Needs and Requirements for OV|41 Installation...............................6-55
6.8 Installation ............................................................................................6-56
1-4
6.9 Post-Installation Checklist ..................................................................6-62
6.10 Disassembly and Removal..................................................................6-62
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Chapter 7 OV|41 Initialization
7.1 Initialization ......................................................................................... 7-63
7.1.1 Initialize OV|41 With New System Software.........................................................7-63
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Chapter 1 Introduction and Safety Considerations
1.1 Overview The OV|41 (On-Board Validator 41) Repair and Maintenance Manual provides
complete, detailed instructions for operating, maintaining, and troubleshooting
the OV|41. Comprehensive charts, tables, graphs, and other diagrams provide a
technical document that is easy to use and understand.
Full documentation that would be needed by maintenance personnel is available
through Scheidt & Bachmann. The manual assumes that comprehensive repair
procedures will be performed by fully trained contractor technicians.
This manual reflects Scheidt & Bachmann’s commitment to providing our customers with comprehensive technical documentation, along with training guidelines to augment our customer training program.
1.2 Manual Organization
The organizational structure of the OV|41 Repair and Maintenance Manual is
outlined below.
Chapter 1 – Introduction
Chapter 2 – Glossary
Chapter 3 – Declaration of Conformity
Chapter 4 – Troubleshooting and Module Removal
Chapter 5 – Preventive Maintenance
Chapter 6 – OV|41 Installation
Chapter 7 – OV|41 Initialization
PLEASE READ THIS MANUAL AND ALL REFERENCED DOCUMENTS
CAREFULLY BEFORE ATTEMPTING TO INSTALL THIS AFC EQUIPMENT.
FAILURE TO FOLLOW THE INSTRUCTIONS IN THIS MANUAL AND THE
INSTRUCTIONS OR NOTES IN THE INSTALLATION DRAWINGS MAY
CAUSE INJURY TO YOURSELF OR DAMAGE TO THE EQUIPMENT AND
MAY ULTIMATELY COMPROMISE THE OPERABILITY OF THE
EQUIPMENT!
All Automated Fare Collection (AFC) equipment is TÜV-SÜD-NRTL listed. To
continue to be compliant with TÜV-SÜD-NRTL requirements, please note that
the following items need to be performed during installation:
The equipment will remain TÜV-SÜD-NRTL compliant only if the mounting and
wiring are also TÜV-SÜD-NRTL compliant. Please take great care during installation to comply with TÜV-SÜD-NRTL and NEC requirements.
When measuring for position, always use the center of the device as the reference point.
Ensure compliance with all Safety Regulations and Safety
Recommendations.
Although this manual has been prepared with great care, some information may
seem unclear. If so, please feel free to contact us with your remarks or questions.
Scheidt & Bachmann GmbH
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1-7
DISCLAIMER
Scheidt & Bachmann GmbH IS NOT LIABLE FOR INJURIES TO ANY
PERSON OR DAMAGE TO THE EQUIPMENT RESULTING FROM FAILURE
TO COMPLY WITH THE MANUFACTURER’S INSTRUCTIONS OR
DOCUMENTATION. THIS DISCLAIMER INCLUDES ALL THIRD PARTY
DOCUMENTATION PREPARED BY OEMS AND PROVIDED AS A
COURTESY BY Scheidt & Bachmann GmbH. TO ITS CUSTOMERS.
1.3 Safety This section describes safety requirements for technicians who perform mainte-
nance or repair procedures for all AFC Systems. Information provided in this
chapter also includes a description of safety warnings and precautions.
PLEASE READ THIS MANUAL AND ALL REFERENCED DOCUMENTS
CAREFULLY BEFORE ATTEMPTING TO WORK WITH THIS EQUIPMENT.
FAILURE TO FOLLOW THE INSTRUCTIONS IN THIS ENTIRE MANUAL
MAY CAUSE INJURY TO YOURSELF OR DAMAGE TO THE EQUIPMENT
AND MAY ULTIMATELY COMPROMISE THE OPERABILITY OF THE
EQUIPMENT!
DISCLAIMER
Scheidt & Bachmann GmbH IS NOT LIABLE FOR INJURIES TO ANY
PERSON OR DAMAGE TO THE EQUIPMENT RESULTING FROM FAILURE
TO COMPLY WITH THE MANUFACTURER’S INSTRUCTIONS OR
DOCUMENTATION. THIS DISCLAIMER INCLUDES ALL THIRD PARTY
DOCUMENTATION PREPARED BY OEMS AND PROVIDED AS A
COURTESY BY Scheidt & Bachmann GmbH TO ITS CUSTOMERS.
FAILURE TO FOLLOW MANUFACTURER’S INSTRUCTIONS MAY
INVALIDATE ANY OR ALL WARRANTIES, EXPRESS OR IMPLIED.
NOTE: NOT ALL OF THESE WARNING LABELS OR HAZARDS MAY EXIST IN ALL
AFC DEVICES. ONLY THOSE LABELS THAT APPLY TO THE OV|41, AND
ARE REQUIRED TO MEET TÜV-SÜD-NRTL CERTIFICATION REQUIREMENTS, WILL BE FOUND IN THE OV|41. BE CAUTIOUS AND OBSERVANT,
AND LOOK FOR SUCH WARNING LABELS AND POTENTIAL HAZARDS.
ANY TECHNICIAN OR PERSON ACCESSING THE INTERIOR OF ANY AFC
DEVICE SHOULD USE COMMON SENSE AND EXERCISE EXTREME CAUTION.
Safety Features
Safety engineering is an integral part of Scheidt & Bachmann’s designs. Maintenance technicians must perform maintenance and repair in accordance with
industry safety standards including MSHA, OSHA, and other Federal, State, and
Local codes and regulations.
Close attention to proper safety precautions is of the utmost importance. Components should be installed, maintained, and repaired only by trained, qualified
personnel using reasonable care. Improper installation, maintenance, or repair
procedures may damage the device or cause serious personal injury or death.
The following pages provide detailed information on safety precautions that
must be observed when working on AFC Systems. This information should be
carefully read and thoroughly understood before performing routine maintenance or attempting to troubleshoot or repair the device.
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It is the responsibility of the maintenance agency to ensure that the safety
instructions in this manual are read, understood, and implemented by properly
trained maintenance and service technicians. All other persons who work with
the internal systems of any AFC systems should also be trained in safety.
1.4 General Safety Guide
This chapter provides the technician with the safety information necessary to
avoid personal injury or equipment damage. Only qualified, trained technicians
using reasonable care should perform maintenance or repair. As with any
mechanical system, the AFC components can pose certain safety hazards. The
following guidelines must be followed when working on the mechanical systems
of any AFC Systems or Components.
Only competent, qualified technicians trained by Scheidt & Bachmann should
service this device.
Service technicians must read and understand all operating and service
instructions.
Turn electrical power off before opening any electrical enclosure.
Do not operate the device with the cover of any enclosure, or the guard or
covers over any mechanism, removed.
Due consideration should be given to any safety regulation applicable to the
particular location in which the device is operating.
Do not turn on power to the device when components are disconnected.
The device must not be used for any purpose other than that for which it was
designed and approved by Scheidt & Bachmann.
When servicing or repairing the device, all device control panels must be
tagged in compliance with OSHA Lockout/Tag out procedures to indicate that
the device should not be operated.
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1.5 Protective Equipment
The technician should use care when working with solvents and other cleaning
agents that may be abrasive or have a tendency to cause irritation to the skin or
eyes. Read all labels carefully and follow instructions for the use of gloves when
working with chemical fluids.
When using cleaning agents such as fluids or pressurized air, safety glasses
must be worn to prevent eye damage.
1.6 Special Tools There are no special tools required to ensure the safety of the service techni-
cian. However, ESD (Electrostatic Discharge: see paragraph 1.7.8) protection is
required for all procedures involving contact with electrostatic sensitive printed
circuit boards. The use of a standard ESD Safety Wrist Strap is required when
working with electrostatic sensitive printed circuit boards.
1.7 Use of Symbols in Manual
1.7.1 Warning
Symbol
1.7.2 Caution Symbol The Caution Symbol indicates a potential for damage to a particular part or func-
Symbols for cautions and warnings are used frequently throughout this manual.
Each symbol appears on the left side of the page with the associated text printed
to the right.
There are several different types of symbols that indicate varying levels of safety
hazards. Detailed information on each symbol is provide in this chapter.
It is vital that the technician understand and follow all safety warnings, cautions
and information guidelines when working on AFC Systems.
The Warning Symbol indicates a potential for serious damage to the equipment
or serious injury to the maintenance or service technician. Extreme care should
be used when performing procedures that are preceded by this symbol.
This symbol indicates a WARNING. A detailed description of the particular
hazard will appear next to the symbol in bold, italic print.
tion of the device. Reasonable care should be used when performing procedures preceded by this symbol.
This symbol indicates a CAUTION. A detailed description of the particular
hazard will appear next to the symbol in bold, italic print.
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1.7.3 Information
Symbol
1.7.4 Example
Symbol
The Information Symbol indicates special information that could be important for
protecting a particular part or function of the device. Reasonable care should be
used when performing procedures that are preceded by this symbol.
This symbol indicates that more INFORMATION follows. A detailed
description of the particular hazard will appear next to the symbol in bold,
italic print.
The Example Symbol precedes an example of a function. The text or illustration
explains one possible function. This explanation applies to all other functions of
the same kind.
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This symbol indicates that an EXAMPLE follows.
1.7.5 Finger Tip Maintenance Symbol
1.7.6 Tools Symbol The Tools Symbol indicates that tools are required to perform the task
1.7.7 Electrical Hazard Symbol
The Finger Tip Symbol indicates that no tools are required to perform the task
described. Reasonable care should be used when performing procedures that
are preceded by this symbol.
This symbol indicates a FINGER TIP MAINTENANCE action. A step-bystep description of the task will appear next to the symbol in bold, italic
print.
described. Reasonable care should be used when performing procedures that
are preceded by this symbol.
This symbol indicates a TOOL is required to perform the task described in
the text.
The Electrical Hazard Symbol indicates the potential for serious damage to the
device caused by electrical voltage surges or serious injury to the service technician caused by electrical shock. Extreme care should be used when performing procedures preceded by this symbol.
1.7.8 Electrostatic Discharge Symbol
This symbol indicates possibility of ELECTRICAL HAZARD. A detailed
description of the particular hazard will appear next to the symbol in bold,
italic print.
The Electrostatic Discharge Symbol indicates the potential for serious damage
to the printed circuit boards or other Electrostatic Discharge (ESD) sensitive
devices in the device. Extreme care should be used when performing procedures preceded by this symbol. The technician should wear a grounding strap
and use the proper techniques associated with handling printed circuit boards or
other ESD sensitive devices.
This symbol indicates an ESD HAZARD. A detailed description of the
particular hazard will appear next to the symbol in bold, italic print.
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1.7.9 Hot Hazard Symbol
The Hot Hazard Symbol indicates the danger for serious burns caused by surfaces within the device that may be extremely HOT to the touch. Hot surfaces
can cause serious injury to the service technician. Extreme care should be used
when performing procedures preceded by this symbol.
This symbol indicates a RISK OF BURNS. A detailed description of the
particular hazard will appear next to the symbol in bold, italic print.
1.7.10 Maintenance Cycle Symbol
1.8 Device Safety
Labels
The maintenance cycle symbol indicates the required maintenance cycles
described in the subsequent part of the manual. An example is shown below.
Time is indicated by month or by quantities of coins or tickets.
Preventive maintenance cycle: Every 3 months
The typical AFC device has safety labels on some internal components to alert
service technicians and other personnel that a safety hazard may exist when
working on certain device subassemblies. Not all safety labels may apply to service operations on every subassemblies.
A series of different labels is used within the device. The following paragraphs
describe these labels and note the location within the device where they will be
found. It is important to read and understand this information thoroughly.
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1.8.1 Labels On the OV|41
There are several labels used on the OV|41. These labels and their meanings
are described below.
1.8.1.1 Label
Locations
The Labels shown in Figure 1-1 are found inside the device as shown.
TÜV-NRTL Label
CE Label
Serial Number Label
Figure 1-1 Label Locations
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1-13
1.0.0.1 Type Label The type label shown in Figure 1-2 appears at the back of the enclosure as
shown in Figure 1-1. This label indicates the voltage range, maximum amperes,
year of manufacture, and manufacturing location as well as the name of the
device and serial number.
Figure 1-2 The Type Label
1.8.1.2 CE Label The CE label shown in Figure 1-3 appears on the backside of the device as
shown in Figure 1-1
1.8.1.3 FCC License
Label
1.8.1.4 TÜV SÜD
NRTL Label
Figure 1-3CE Label
The FCC License label shown in Figure 1-4 appears on the backside of the
device.
HVIN: OV41
FCC ID: O5K-NVP
IC: 8312A-NVP
Figure 1-4FCC-License
The TÜV-SÜD-NRTL label shown in Figure 1-4 appears on the backside of the
device as shown in Figure 1-1.
1-14
Figure 1-5FCC-License
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Chapter 2 Glossary
2.1 Glossary of
Terms and
Abbreviations
Many terms and abbreviations are used to describe Fare Collection Equipment.
Some are Automated Fare Collection (AFC) industry standard terms, some are
application-specific, such as networking and telecommunications terms, and
some are unique to the customer’s system.
A
A See “Ampere”.
AC See “Alternating Current”.
Access Level Individual users of a computer system have
specific access rights that regulate what they
can view or modify. Access rights are organized
into groups, which are called Access Levels.
ADA See “Americans with Disabilities Act”.
Alarm Event
Alternating Current An electrical current that continuously changes
An alarm event is generally defined as the
unauthorized opening of an AFC device.
polarity or direction of flow, usually 50 or 60
times per second
Americans with Disabilities
Act (ADA)
Ampere A unit of measure of electrical current, the cur-
ANSI American National Standards Institute
Application Server NT-based server which runs the Central Data
APTA American Public Transportation Association
ASCII American Standard Code for Information Inter-
Audio Speaker A speaker that broadcasts messages in the lan-
AWG American Wire Gauge, a measure of the cross
The federal law mandating facility and equipment accessibility requirements for persons
with disabilities.
rent produced by applying one volt to a circuit
with a resistance of one ohm.
Collection System Application processes
change
guage of choice with content similar to the message on the customer display.
section of a wire.
B
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2-15
Barcode A barcode is used to encrypt data into a series
of vertical bars (universal product code [UPC]).
It identifies various modules within an AFC
device such as a ticket roll.
Barcode Scanner The Barcode Scanner is a handheld scanner
used to read barcodes (e.g. on replacement
components).
Bitmap Bit-oriented graphics
Blower Also referred to as a “fan,” the blower cools the
Central Processing Unit (CPU) in the ECU.
Boot Loading of the operating system into the RAM
Byte 1 Byte = 8 Bit
C
Card A credit, debit, stored value, or “smart” card
CDCS See “Central Data Collection and Information
System”.
Central Data Collection
System (CDCS)
Command Instruction to initiate a special transaction
Command Codes See “Service Command”.
CPU Central Processing Unit
CRC Cyclic Redundancy Check. Check sum of the
Customer Display The Customer Display is a part of the user
Customer Specific Value A data field in which the customer is able to
Centralized company file server that collects
and distributes operating and system fare collection data. The CDCS serves all connected
machines and devices.
content of the file.
interface. In some devices, it may include a
touch screen.
store individualized information.
D
Database A database is an accumulation of individual
pieces of information that are related to each
other.
2-16
Database Server The Database Server is the CDCS hardware
and software system on which the database is
located.
DC Direct Current
DCM Data Control Module; a flash card used to
update equipment in the field.
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Device Type Device type is a term that refers to categories of
AFC equipment, such as TVMs, TOMs, Fare
Gates, MEMs, etc.
Distance Based Fares Fares that vary in cost with the length of the
trip.
DK Derivation key; the derivation key is used within
the data encryption process.
Download The process of sending information from a host
to a client, enabling client data to be updated.
Driver Software interface which connects devices to
the operating system.
DTE Diagnostic and Test Equipment
E
Electrostatic Discharge
(ESD)
Element.h The element.h file defines elements in service/
EPF Ethernet Power Feed; S&B power supply sys-
Error Codes Also called an error message, which is gener-
Error Message See “Error Code”.
ESD See “Electrostatic Discharge”.
Ethernet Card The Ethernet Card is installed in the ECU main
The Electrostatic Discharge symbol indicates
the potential for serious damage to the printed
circuit boards or other Electrostatic Discharge
(ESD) sensitive devices in the device. Grounding precautions must be followed whenever this
symbol appears.
statistic printouts.
tem
ated automatically when a particular set of
abnormal conditions occurs. Error information
concerning a system fault or equipment malfunction can be viewed on the Customer Display, Service Terminal Display, or on a printed
report.
computer. It provides a communications interface between the device and an Ethernet Local
Area Network (LAN).
Event Every action that occurs at or in the TSM is
defined as event.
F
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2-17
FCC Labels Federal Communications Commission (FCC)
labels that identify the license for the transponder identification system. These labels are
located near each transponder, such as on the
Additional Coin Magazine connection board, in
the Coin Magazine Drawer and beside the Coin
Vault.
File Transfer Protocol
(FTP)
Filter A Filter selects data under special criterion.
Firmware Computer programs and data loaded into read-
Flash Card The Flash Card is a memory storage module
FTP See “File Transfer Protocol”.
The Internet's file transfer protocol. FTP, which
has been used for more than two decades, is a
standard protocol for accessing files on servers
all over the world.
only memory that cannot be modified by the
computer during normal operation and that is
not erased by loss of power.
(PCMCIA) used for device initialization and
backup storage.
G
GHz GigaHertz - a unit of measure of electrical fre-
quency equal to one thousand million (1012)
Hertz (cycles per second).
Graphical User Interface The panel and components through which the
customer interacts with the device.
2-18
GUI See “Graphical User Interface”.
H
Hexadecimal Numeric system with base 16 (figures from 0 to
15).
Hz A unit of measure of electrical frequency, equal
to one cycle per second.
I
I/O Abbreviation for input/output
ID Abbreviation for “Identification Number”
IEC International Electrotechnical Commission
IEEE Institute of Electrical and Electronic Engineers
ISDN See “Integrated Services Digital Network”.
ISO International Standards Organization
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K
KB Kilobyte (one thousand bytes, where 1 byte
equals 8 bits)
Keyboard The keyboard is used by the user to enter data
into the system.
kHz KiloHertz – a measure of frequency equal to
one thousand Hertz (cycles per second)
L
LAN See “Local Area Network”.
Language Marker Displays the language the device is equipped
with.
LCD Liquid Crystal Display; see “LCD Display” .
LED Light Emitting Diode
LLRC See “Lowest Level Replaceable Component”.
LLRU See “Lowest Level Replaceable Unit”.
Lmk Check Value The Lmk Check Value images the check sum of
the host security module internal data.
Local Area Network (LAN) A group of interconnected computers located
within the same physical or geographical area
(e.g. within the same building or campus.) See
Wide Area Network.
Login To get access the system, a login with ID and
password has to be completed.
Lowest Level Replaceable
Component (LLRC)
Lowest Level Replaceable
Unit (LLRU)
The most basic component that is normally
replaced in the field
The most basic unit or assembly that is normally replaced in the field
M
mA Milliampere – a unit of measure of electrical
current equal to one thousandth of an ampere.
An ampere is the current that flows through a
circuit of 1 ohm resistance with a voltage of 1
Volt applied.
MAC Abbreviation for Message Authentication
Codes.
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mAh An mAh is a milliampere-hour. It is one thou-
sandth of an ampere-hour and is commonly
used as a measure of charge in batteries. An
ampere-hour is the amount of energy charge in
a battery that will allow one ampere of current
to flow for one hour. The HCR battery is rated at
1200 mAh.
Main Circuit Breaker The Main Circuit Breaker, which is located in
the Power Connection Box, protects the system
against high current overload.
Main Module Main Application which controls the Central
Server Application.
Maintenance The action performed to prevent equipment
performance degradation or failure (preventive
maintenance) or restore the device to an in-service condition following a failure (corrective
maintenance).
MB Megabyte – one million bytes, where one byte
equals 8 bits.
Mbps Megabits per second – one million bits per sec-
ond
MDT Abbreviation for Mobile Data Transporter.
MSHA Mine Safety and Health Administration
Multimedia Multimedia includes texts, pictures and audio
data.
N
NEMA National Electrical Manufacturers Association
Noise Extraneous or interfering signals present on a
system caused by undesirable voltages or currents.
NRTL National Registered Test Laboratory
NWC Abbreviation for Network Controller
O
Occupational Safety and
Health Administration
(OSHA)
The United States Government regulatory and
oversight agency responsible for safety in the
workplace.
2-20
ODBC Open Data Base Connectivity
OEM Original Equipment Manufacturer
Oersted [Oe] 1 Oersted = 2.021268 Ampere per inch
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