Eaton Electrical Network Card MN05001002E User Manual

Intelligent Technologies  
QCPort System Install Manual  
November 2005  
Supercedes November 2004  
MN05001002E (C)  
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Intelligent Technologies QCPort System Install Manual  
November 2005  
Throughout this manual, various types of notices are provided to alert you to possible  
injury to people or damage to equipment under specific circumstances. These will help  
you:  
Identify a hazard  
Avoid the hazard  
Recognize the consequences  
These include “Attention” and “Important” notices; please note the following examples.  
Warning  
Identifies information about practices or circumstances that can lead to personal  
injury or death, property damage or economic loss.  
Warning  
Identifies information that is especially important for successful application and  
understanding of the product.  
National Electric Code  
Warning  
Do not install or perform maintenance on the QCPort system while the system is  
energized. Death or severe personal injury, as well as damage to other equipment,  
can result from contact with energized equipment. Verify that no voltage is present  
before proceeding with installation or maintenance.  
Much of the information provided in this manual is representative of the capability of a  
QCPort system and its associated components. The National Electric Code (NEC), in the  
United States, and the Canadian Electric Code (CE Code), in Canada, places limitations  
on configurations and the maximum allowable power/current that can be provided.  
The instructions and examples in this manual are based on Class 2 power supplies.  
Warning  
Be sure that all national and local codes are thoroughly researched and adhered to  
during the planning and installation of your QCPort system.  
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Intelligent Technologies QCPort System Install Manual  
November 2005  
Table of Contents  
INTERCONNECTIVITY USING QCPORT....................................................................................... 6  
INTRODUCING QCPORT ..................................................................................................................6  
QCPORT PHYSICAL CHARACTERISTICS ...........................................................................................6  
EXAMPLES OF QCPORT USE...........................................................................................................7  
One Device Using QCPort  
Multiple Peripherals on One Device Using QCPort  
Multiple Devices Being Controlled And Monitored Remotely Using QCPort  
7
8
9
QCPORT OPERATING MODES................................................................................................... 10  
Overview  
Understanding Master-Slave  
Understanding Peer  
10  
10  
10  
OVERVIEW OF QCPORT INTERCONNECT SYSTEM................................................................ 11  
DEVICE CONNECTION IN A QCPORT SYSTEM .................................................................................11  
QCPort Backplane  
QCPort Interconnect Cable  
11  
12  
DAISY CHAIN ................................................................................................................................14  
TRUNK DROP................................................................................................................................14  
PHYSICAL PLACEMENT..................................................................................................................15  
USING BIASING RESISTORS...........................................................................................................16  
APPLICATION EXAMPLE .................................................................................................................17  
PLANNING A QCPORT INTERCONNECT SYSTEM................................................................... 18  
GUIDELINES FOR SUPPLYING POWER.............................................................................................18  
IT. Power Supplies  
Other Power Supplies  
18  
18  
POWER RATINGS ..........................................................................................................................18  
QCPort Interconnect Cable Rating 18  
LOCATING A POWER SUPPLY.........................................................................................................19  
1 Power Supply 20  
GROUNDING THE INTERCONNECT SYSTEM .....................................................................................20  
SIZING A POWER SUPPLY ......................................................................................................... 21  
SUPPLYING POWER ......................................................................................................................21  
ADJUSTING THE CONFIGURATION...................................................................................................21  
SIZING CALCULATION....................................................................................................................22  
USING THE SIZING CALCULATION...................................................................................................23  
Example 1 End Connected Power Supply  
Example 2 End Connected Power Supply  
Example 3 Middle Connected Power Supply  
23  
23  
24  
TROUBLESHOOTING AND MAINTENANCE.............................................................................. 25  
APPENDIX A: USING LONG RUN CABLES ............................................................................... 26  
TECHNICAL SUPPORT................................................................................................................ 28  
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Intelligent Technologies QCPort System Install Manual  
November 2005  
Table of Figures  
Figure 1: Example of One Device Using QCPort  
7
8
9
Figure 2: Example of Multiple Peripherals on One Device Using QCPort  
Figure 3: Example of Remote Connection Using QCPort  
Figure 4: QCPort Backplane Connector  
Figure 5: 6 Pin QCPort Linear Connector  
Figure 6: QCPort Interconnect Cable  
Figure 7: QCPort Powered Interconnect Cable Wiring  
Figure 8: Long Run Cable Connection  
Figure 9: Daisy Chain Topology  
Figure 10: QCPort Biasing Resistor Options  
Figure 11: Distributed Motor Control Panel  
Figure 12: 1 Power Supply  
11  
11  
12  
12  
13  
14  
16  
17  
20  
26  
Figure 13: Example of Long Run Cable: One Power Supply (End-Connected)  
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Intelligent Technologies QCPort System Install Manual  
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Interconnectivity Using QCPort  
Introducing QCPort  
The interface demands on control devices continues to increase at a rapid pace. An  
intelligent control device requires connection to configuration and monitoring tools,  
operator interfaces, and other peripheral devices, as well as the option to connect to a  
variety of industrial fieldbusses. At the same time, the intelligent devices continue to  
shrink in size and cost, forcing distribution of the field connections that once were native  
on the devices.  
QCPort is a flexible interface port that integrates the many connectivity needs of the  
intelligent device into a single device port for the means of control, setup, and  
configuration. The integration of these capabilities provides interface options that are  
powerful and cost effective. In addition to the interface functionality of QCPort, care has  
been taken to insure that systems that connect via QCPort are simple to configure,  
connect, and maintain.  
QCPort Physical Characteristics  
In an effort to use existing proven technology, QCPort uses the RS485 physical layer.  
This physical layer is common to many industrial communication interfaces and has a  
long and proven track record within industrial applications. QCPort is a four-wire system  
where there is an A and B for signal and a +DC and Ground for device power.  
Depending on the type of device interconnect and the distance between devices, there  
are many choices for the type of interconnect physical media; these choices will be  
discussed further in the manual.  
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Intelligent Technologies QCPort System Install Manual  
November 2005  
Examples of QCPort Use  
One Device Using QCPort  
In many applications, the QCPort will be used as the connection between a motor  
controller and the user interface/configuration keypad. The following figure contains a  
one-to-one solution, where the user interface is powered from the motor controller’s  
QCPort. A separate power supply is not required for the user interface. In this example,  
the user interface is connected to Channel 0 of the motor controller. Channel 0 is  
specifically used for connection to the user interface and operator stations.  
Figure 1: Example of One Device Using QCPort  
The interconnect supplied with the operator interface connects the operator interface to  
the motor controller. This connection provides for 24V DC and communication; the  
operator interface is powered from the motor controller. Configuration of the operator  
interface or the motor controller for this application is not required for communication to  
be established. The user can then use the operator interface to configure the motor  
controller parameters, operate the motor controller, and monitor the operation of the  
motor controller.  
The information contained within this manual does not include instructions for setup or  
operation of the motor controller or operator interface. For instructions on how to apply  
the operator interface, refer to the manual for that device.  
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Multiple Peripherals on One Device Using QCPort  
QCPort has been designed to support multiple devices connected to one motor  
controller, without the motor controller having prior knowledge of the connected device.  
Devices that can be connected to a motor controller include user interface products and  
IO products. Once again, the devices are connected to Channel 0 of the motor controller.  
The figure below illustrates an application example that includes a user interface and IO  
modules. The input module is used to apply a hard-wired HOA while the output module  
is used to annunciate the motor controller status and trip conditions. The mapping of the  
data between the motor controller and the IO devices does not require a tool and is  
seamless to the user.  
Figure 2: Example of Multiple Peripherals on One Device Using QCPort  
When multiple devices are connected to one motor controller, the user has to be aware of  
the power demand of all of the peripherals. Verify the power requirement of this system  
by adding up the power demands of the peripherals to see if they exceed the power  
capacity of the motor controller. If the power capacity of the motor controller is exceeded,  
a power supply is required for QCPort. To help size the power supply, consult “Locating  
a Power Supply” later in the manual.  
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Intelligent Technologies QCPort System Install Manual  
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Multiple Devices Being Controlled And Monitored Remotely Using QCPort  
When an industrial fieldbus adapter is used within a system, the adapter will act as a  
subscanner presenting the QCPort devices as IO to the industrial fieldbus. This allows  
the QCPort devices to be monitored, controlled, and configured from a remote location.  
For this type of application, a power supply will be required; it can be the same power  
supply that is used for the motor controllers.  
IT. 24V DC  
Power Supply  
DeviceNet  
IT. EM Starters and D77B-QSNAPs  
Figure 3: Example of Remote Connection Using QCPort  
Since a power supply sizing is required, refer to “Locating a Power Supply” later in this  
manual. Along with the power supply sizing, physical media restrictions must be  
followed. This includes the length of the interconnects, type of interconnects, and the  
power capabilities for the interconnects.  
This type of application requires some configuration. The Group IDs for the QCPort  
devices need to be set to unique IDs, the adapter requires an address configuration, and  
then the mapping feature needs to be invoked to map the QCPort data to the industrial  
fieldbus. None of these configuration requirements require a software tool. If advanced  
configuration of the QCPort devices is required, then a software tool or a QCPort user  
interface will be required. For information on configuration of the QCPort devices, refer to  
the user manual for those devices.  
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Intelligent Technologies QCPort System Install Manual  
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QCPort Operating Modes  
Overview  
The QCPort system is capable of two operating modes:  
Master-Slave  
Peer  
When the system is intended to be used in a master-slave setting there is no  
configuration necessary other then setting the address (group ID) of each device to a  
unique address  
Peer devices require a configuration setting for normal operation. Devices that will  
communicate peer are the S811 soft start and the user display (DIM).  
Understanding Master-Slave  
Master-Slave is when a single device (master) is responsible for scheduling all  
communication to the remainder of the devices (slaves). In most cases, this will be  
limited to IO applications where a Network Adapter is controlling the IO and motor control  
devices. A slave only communicates when it is communicated to; thus eliminating  
collisions. Since there are no unscheduled communications in a Master-Slave system,  
the scan time of a QCPort system will be deterministic.  
An example of a Master-Slave system can be found in Figure 3: Example of Remote  
Connection Using QCPort.  
Understanding Peer  
Peer communication is when devices broadcast their messages on event transitions or a  
time base to a specific device or groups of devices. Unlike Master-Slave, this mode has  
no master scheduler in the system, and all devices produce data on an internal schedule  
or when an event occurs (e.g., input transition, fault). In this mode, there is collision  
detection to detect if a message is damaged by two devices talking at the same time. If  
this occurs, then the devices both stand off (at different stand off times) for a period of  
time and attempt to re-transmit the message.  
An example of a Peer-to-Peer system can be found in Figure 2: Example of Multiple  
Peripherals on One Device Using QCPort.  
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Intelligent Technologies QCPort System Install Manual  
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Overview of QCPort Interconnect System  
Device Connection in a QCPort System  
Devices are connected into a QCPort system using one of the following connection  
types—either a backplane or interconnect cabling. Both of the connection types provide  
for communication and power.  
The entire QCPort system, using QCPort pre-manufactured interconnects, cannot exceed  
100 feet [30 meters] in total length. For systems that require longer runs, the long run  
interconnect is used. Using the long run interconnect, the system length is increased to  
500 feet [150 meters] @ 460Kbaud and 1000 feet [300 meters] @ 230Kbaud. In this  
case, special care has to be taken to size the power supply correctly for the distance.  
QCPort Backplane  
The QCPort backplane provides a convenient way to connect the Network Adapter and  
IO devices that are located in close proximity to one another. The QCPort backplane  
mounts within a DIN rail, allowing the receptacles on the back of the Network Adapter  
and IO products to plug into them. This auto connection eliminates the need for any  
customer communication or power wiring between devices, while providing hot insertion  
and removal without affecting other devices.  
The QCPort backplane provides the data signals and the 24V DC to power all devices  
that are connected. The QCPort backplane is limited to a maximum current carrying  
capacity of 6 amps.  
Figure 4: QCPort Backplane Connector  
1
GND  
B
A
+24  
6
Backplane  
Device or  
Screwed Plug  
Figure 5: 6 Pin QCPort Linear Connector  
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QCPort Interconnect Cable  
QCPort Interconnect cable provides a convenient way to connect QCPort devices that  
are not mounted directly next to one another or where a Backplane could be used. The  
QCPort Interconnect cable is ordered from the factory at preconfigured standard lengths.  
QCPort devices provide two QCPort interconnect cable plug connections that are in  
parallel, so that the devices can be daisy chained together. The QCPort Interconnect  
cable provides the data signals and 24V DC power. The QCPort powered interconnect  
Cable is limited to a maximum current carrying capacity of 1.0 amps.  
Interconnect Cable  
Figure 6: QCPort Interconnect Cable  
1
1
1 - +24  
2 – G  
3 – B  
4 – A  
5 - +24  
6 - G  
1
1
Figure 7: QCPort Powered Interconnect Cable Wiring  
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Long Run Cable  
In applications that require connections between devices that are greater than 10 feet [3  
meters] apart, or greater current carrying capacity is needed than the interconnect cable  
supports, a “long run” cable should be used. This cable provides data and 24V DC  
power connections up to 1000 feet [300 meters].  
Long Run  
D77E-QPLR  
D77E-QPLR  
Figure 8: Long Run Cable Connection  
Long Run Cable Recommended Manufacturers  
Table 1: Manufacturers and Part Numbers for Long Run Cables  
Manufacturer  
Belden  
Part Number  
82842 (Plenum Rated)  
9842 (Non-Plenum Rated)  
8807P (Plenum Rated)  
6413 (Non-Plenum Rated)  
Belden  
Alpha  
Alpha  
Long Run Interconnect Cable Rating  
The long run rating is 4A. Due to cable resistance, voltage drops may limit your  
application to less. Details are provided later in this chapter.  
Table 2: RJ Interconnect Maximum Current  
Long Run Interconnect Cable  
20 ft [6 meters]  
Allowable Current  
4 A  
60 ft [18 meters]  
3.2 A  
2.5 A  
0.5 A  
0.2 A  
100 ft [30 meters]  
500 ft [150 meters]  
1000 ft [300 meters]  
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Planning a QCPort Topology  
QCPort is a RS485 based system and allows only two topologies; they are daisy chain  
and trunk drop. Connecting QCPort in a star is not allowed since it will produce  
unreliable communication.  
Daisy Chain  
A daisy chain topology consists of a single wire that connects devices. This single wire  
enters and exits the device at one point (two connectors). Devices that can be connected  
in this topology have two QCPort connectors on them and/or a QCPort backplane  
connector. The two QCPort connectors are in parallel with each other so the connection  
is virtually one wire between devices.  
When designing a system using daisy chain, there are two rules to be aware of. First, the  
complete QCPort system cannot be greater than 100 feet [30 meters], and second, the  
longest wire distance between devices, using the pre-manufactured QCPort Interconnect  
Cables, is 10 feet [3 meters]. When distances longer than 10 feet [3 meters] are required  
between devices, there are other methods that include using a long run cable and  
connectors.  
Methods of connection include using QCPort Interconnect Cable, QCPort Backplane,  
Long Run, or any combination of the three. For more information on connection  
methods, see “Device Connection in a QCPort System on page 11.  
Figure 9: Daisy Chain Topology  
Trunk Drop  
A trunk drop topology consists of a single wire, the trunk, with multiple drops coming off  
the trunk. The trunk can be the Backplane or long run cable where the drops are then  
connected to the trunk. When the trunk is a Backplane, the drops will connect using  
QCPort Interconnect cables from the devices on the Backplane. When the trunk is a long  
run cable, a D77E-QPLR (biasing resistor and power tap) is used to change the long run  
into either a Backplane or QCPort Interconnect cable connection. The biasing resistor  
portion of the D77E-QPLR is capable of being switched on or off. When used as a drop  
point in a long run cable application, the biasing resistor will most likely be switched off.  
The rules to be aware of when designing a Trunk Drop system are that the maximum  
drop cannot exceed 1 foot [0.3 meter], and that the sum of the drops cannot exceed 20  
feet [6 meters].  
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Methods of connection include using QCPort Interconnect Cable, QCPort Backplane,  
Long Run, or any combination of the three.  
Physical Placement  
When planning the connection, care should be taken as to the physically placement of  
the devices. Considerations include:  
Grouping IO to utilize the Backplane.  
Grouping devices that only use the QCPort Interconnect cable.  
Changing media as little as possible.  
For most applications, it will be possible to require only one change in media.  
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Using Biasing Resistors  
Depending on the type of QCPort system being implemented, biasing resistors may or  
may not be required. For Figure 1 and Figure 2 under the “Interconnectivity Using  
QCPort” section (One Device Using QCPort), a single biasing resistor is required when  
the total length of the system is less than 3 feet [1 meter].  
When connecting a Network Adapter to IO and motor controllers, as in Figure 3 Multiple  
Devices Being Controlled And Monitored Remotely Using QCPort, biasing resistors are  
required on the end furthest from the network Adapter. A biasing resistor is not required  
on the one end that the Network Adapter is located since the Network Adapter has a  
biasing resistor integral.  
When a biasing resistor is required, use part # D77E-TERRJ or D77E-QPLR. These  
biasing resistors connect between A and B and require 24V DC present on QCPort to be  
functional. The D77E-QPLR has three connections to QCPort. They are through the RJ  
connectors at the bottom, the Backplane connector on the back, and then through the  
front connector at the A and B terminals. The D77E-TERRJ has only one way to connect  
to QCPort, which is through the RJ connectors. There are two connectors that are in  
parallel with each other so it is not important which way the biasing resistor is orientated.  
D77E-QPLR  
D77E-TERRJ  
P-  
P+  
-
Aux  
Power  
+
A
B
QCPort  
Com  
-
+
P-  
P+  
-
24V DC  
+
Figure 10: QCPort Biasing Resistor Options  
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Application Example  
IT. 24V DC  
Power Supply  
Figure 11: Distributed Motor Control Panel  
In this Distributed Motor Panel application example, there are two types of interconnect  
media being used. The IO and Network Adapter use the Backplane Interconnect while  
the motor starters use the QCPort Interconnect cables. In this example, the QCPort  
power is supplied through the D77E-QPLR biasing resistor (last module), and the change  
from the backplane to the QCPort Interconnect cable is performed there as well.  
When powering the QCPort system, the power supply that provides power to the starters  
is the same power supply that provides power to the QCPort system. It is important to  
size the power supply for the load of the starters and the QCPort load in this application.  
Another configuration would include an Automation power supply for the QCPort  
components only, and a separate power supply for the IT starters.  
All the devices within this example can and will work as designed using one power  
supply. For reasons of isolation, a separate DeviceNet power supply would be required  
to power the DeviceNet products.  
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Planning a QCPort Interconnect System  
Guidelines for Supplying Power  
Use the following guidelines to protect your devices and achieve the best results when  
supplying power to the QCPort interconnect system.  
IT. Power Supplies  
The IT. family of products includes power supplies that meet the needs of the QCPort  
devices and motor control. The same power supply that is used for the IT. motor  
controller line is applicable to the QCPort system.  
Other Power Supplies  
When selecting a power supply from another vendor, use the following guidelines:  
Use power supplies rated at 24V  
Select a power supply that provides sufficient current for all attached nodes.  
Note: In the U.S. and Canada, be sure to adhere to NEC and CE Code limits  
respectively.  
Use a power supply that has its own current limit protection.  
Make sure you derate the supply for temperature using the manufacturer’s  
guidelines.  
Provide fuse protection for each segment of the cable system; any section  
leading away from a power supply must have protection (can be part of the  
power tap).  
Power Ratings  
The power capabilities of the QCPort interconnect system include:  
Power supplies rated at 24V DC.  
Long Run cables rated for 4 A steady state.  
Interconnect Cables rated for 1.0 A steady state.  
Backplane rated for 6 A steady state.  
Notice  
Check your national and local codes for additional information. In the United States  
and Canada, the QCPort cable system must be installed as a Class 2 circuit. This  
requires limiting the current to 4 A.  
QCPort Interconnect Cable Rating  
The QCPort Interconnect rating is 1.0 A, but the allowable current depends on the length  
of the run. The maximum current decreases as the QCPort Interconnect cable length  
increases, as indicated in the table below.  
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Table 3: RJ Interconnect Maximum Current  
QCPort Interconnect Cable  
10 [25] inch [cm]  
Allowable Current  
1.0 A  
1.0 A  
1.0 A  
1.0 A  
3 [1] feet [meter]  
6 [2] feet [meter]  
10 [3] feet [meter]  
The voltage range between +24 and G must be between 18 and 28V DC.  
Locating a Power Supply  
The QCPort interconnect system allows several options for supplying power, as outlined  
in this section. To determine which option meets your needs, consider the distribution of  
the loads, power supply location, and the number of power supplies used. Power  
supplies must be 24 volts.  
Notice  
In the United States and Canada, the power supply must also be Class 2.  
Warning  
Whenever two or more power supplies are connected to the same segment, the  
ground for the system must be referenced to only one point.  
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1 Power Supply  
Locate the power supply at the end, middle, or anywhere along the cable, as illustrated in  
the following figure.  
Biasing resistor  
Power  
Supply  
Device  
Device  
Device  
Biasing resistor  
Figure 12: 1 Power Supply  
Grounding the Interconnect System  
You must ground the QCPort system at only one location.  
Warning  
If you use more than one power supply, all of them should be attached to the same  
earth ground.  
Ground the G conductor at only one place at the power supply that is closest to the  
physical center of the QCPort system to maximize the performance and minimize the  
effect of outside noise.  
To ground QCPort:  
Connect the G wire to earth ground using a 1 in (0.25 mm) copper braid or a #8  
AWG wire up to 10 ft (3 m) maximum in length.  
Use the same wire to connect the power tap to earth ground.  
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Sizing a Power Supply  
It is important to verify that the power supply is properly sized for the load and the length  
of the QCPort system. To calculate if the placement and the size of the power supplies  
are adequate, refer to the examples in the Using the Sizing Calculation on page 23.  
Supplying Power  
Follow these guidelines to protect your nodes and to achieve the best results when  
supplying power to the QCPort cable system.  
Use power supplies rated at 24V.  
Select a power supply that provides sufficient current for all attached nodes.  
Make sure you derate the power tap and the power supply for the expected  
temperature using the manufacturer’s guidelines.  
Use a power supply that has its own current limit protection.  
Adjusting the Configuration  
When the sections have a voltage drop less than 4.65V, your configuration will operate  
properly. Ideally, the voltage drops for each section should be within 10%. If one section  
has a substantially greater voltage drop than the other, you should attempt to balance the  
load of the cable system by moving the power supply or nodes. Some ways to make  
your system operational include the following:  
Shorten the overall length of the cable system.  
Move the power supply in the direction of the overloaded section.  
Move devices from the overloaded section to another section.  
Move higher current loads as close to the supply as possible.  
Add a second power supply to the cable system.  
Break the QCPort system into two separate networks to reduce the number of  
nodes on each.  
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Sizing Calculation  
A power supply that is not end connected creates two sections of cable. Because of this,  
each section needs to be evaluated separately. The equation sums the calculated drop  
for each device and compares it to 4.65V.  
SUM {[(Ln x Rc) + (Nt x (0.005))] x In } <= 4.65V  
Term Definition  
Term  
Definition  
Ln  
L = The distance (ft) between the  
(0.005)  
The nominal-contact resistance used for  
every connection to the trunk line.  
device and the power supply,  
excluding the drop line distance.  
n = The number of the device  
being evaluated, starting with 1 for  
the device closest to the power  
supply and increasing by 1 for the  
next device.  
Rc  
Nt  
Long Run  
4.65V  
The maximum voltage drop allowed.  
This is the total cable system voltage  
drop of 5.00V minus 0.35V reserved for  
drop line voltage drop.  
0.021 (ohm/ft)  
QCPort Interconnect  
0.105 (ohm/ft)  
The number of taps between the  
device being evaluated and the  
power supply. For example:  
In  
I = The current drawn from the cable  
system by the device. For currents  
within 90% of the maximum, use the  
nominal device current. Otherwise, use  
the maximum rated current of the device.  
When a device is the first  
one closest to the power  
supply, this number is 1.  
For a device attached as a drop from a  
device, the currents for the trunk and  
drop device should be summed and  
counted as one tap.  
When a node has one device  
between it and the power  
supply, this number is 2.  
n = The number of devices being  
evaluated, starting with 1 for the device  
closest to the power supply and  
increasing by 1 for the next device.  
When 10 devices exist  
between the evaluated node  
and the power supply, this  
number is 11.  
For a device attached as a drop  
from a device, the currents for the  
trunk and drop device should be  
summed and used with the  
equation only once.  
MN05001002E  
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Page 22  
 
Intelligent Technologies QCPort System Install Manual  
November 2005  
Using the Sizing Calculation  
The following examples use the sizing calculation to determine if the power supply is  
placed correctly in the system and if the power supply is large enough for the application.  
Example 1 End Connected Power Supply  
1 foot  
1 foot  
1 foot  
1 foot  
1 foot  
PS  
T
D1  
D2  
D3  
T
0.1A  
1.1A  
0.3A  
1. Sum up all the currents (QCPort Interconnect system)  
=0.1 + 1.1 + 0.3 = 1.5A (too much for Interconnect)  
The supply will have to be relocated.  
Example 2 End Connected Power Supply  
10 foot  
10 foot  
10 foot  
10 foot  
10 foot  
PS  
T
D1  
D2  
D3  
T
0.1A  
0.4A  
0.3A  
1. Sum up the currents (QCPort Interconnect system)  
=0.1 + 0.4 + 0.3 = 0.8 A (OK since 10 feet allows 1.0A)  
2. Find the voltages for each node using the equation for Long Run.  
SUM {[(Ln x (0.105)) + (Nt x (0.005))] x In } <= 4.65V  
Device 1 [(20 x (0.105)) + (1 x (0.005))] x 0.1 = 0.21V  
Device 2 [(30 x (0.105))+ (2 x (0.005))] x 0.4 = 1.26V  
Device 3 [(40 x (0.105)) + (3 x (0.005))] x 0.3 = 1.26V  
3. Add each Devices voltage together to find the total voltage.  
0.21 + 1.26 + 1.26 = 2.73V (OK)  
Results  
Since the total voltage does not exceed 4.65V, the system will operate properly.  
MN05001002E  
For more information visit www.eatonelectrical.com  
Page 23  
 
Intelligent Technologies QCPort System Install Manual  
November 2005  
Example 3 Middle Connected Power Supply  
3 foot  
3 foot  
3 foot  
3 foot  
0 foot  
0 foot  
T
D1  
D2  
D3  
PS  
D4  
D5  
T
.2 A  
.3 A  
.1A  
1 A  
2 A  
Section 1  
Section 2  
2. Sum up the currents per section  
Section 1 (QCPort Interconnect) = 0.2 + 0.3 + 0.1 = 0.6 A (OK)  
Section 2 (Backplane) = 1.0 + 2.0 = 3.0 A (OK)  
Find the voltages for each device using the equation for Long Run.  
SUM {[(Ln x (0.105)) + (Nt x (0.005))] x In } <= 4.65V  
Device 1 [(9 x (0.105)) + (3 x (0.005))] x 0.2 = 0.19V  
Device 2 [(6 x (0.105))+ (2 x (0.005))] x 0.3 = 0.19V  
Device 3 [(3 x (0.105)) + (1 x (0.005))] x 0.1 = 0.03V  
Device 4 [(0 x (0.105)) + (1 x (0.005))] x 1.0 = 0.00V  
Device 5 [(0 x (0.105)) + (2 x (0.005))] x 2.0 = 0.02V  
Add each Devices voltage together to find the total voltage per section.  
Section 1 – 0.19+0.19+0.03 = 0.41V (OK)  
Section 2 – 0.00+0.02 = 0.02V (OK)  
Results  
Since the total voltage does not exceed 4.65V in either section, the system will operate  
properly.  
MN05001002E  
For more information visit www.eatonelectrical.com  
Page 24  
 
Intelligent Technologies QCPort System Install Manual  
November 2005  
Troubleshooting and Maintenance  
Refer to the selected device manuals for more detailed hints on troubleshooting.  
MN05001002E  
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Page 25  
 
Intelligent Technologies QCPort System Install Manual  
November 2005  
Appendix A: Using Long Run Cables  
When devices require locating further than 100 feet [30 meters] from one another, the  
physical media changes from QCPort Interconnects to Long Run cables. This cable is  
better rated for current carrying capacity and for the RS485 communication.  
When connecting between Long Run and a QCPort device, the D77E-QPLR is required  
to change the physical media. The D77E-QPLR provides for screw lugs for connection to  
industrial RS485 cable.  
Example of Long Run Cable: One Power Supply (End-Connected)  
The following example uses the full calculation method to determine the configuration for  
one end-connected power supply on a thick cable trunk line.  
Device 1 and Device 2 cause the same voltage drop, but Device 2 is twice as far  
from the power supply and draws half as much current.  
Device 4 draws the least amount of current, but it is farthest from the power  
supply and causes the greatest incremental voltage drop.  
T – Biasing resistor  
95 ft  
43 ft  
36 ft  
18 ft  
T
T
Power  
Supply  
Device 1  
1.0 A  
Device 2  
0.5 A  
Device 3  
0.4 A  
Device 4  
0.3 A  
Figure 13: Example of Long Run Cable: One Power Supply (End-Connected)  
MN05001002E  
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Page 26  
 
Intelligent Technologies QCPort System Install Manual  
November 2005  
1. Find the voltages for each node using the equation for Long Run.  
SUM {[(L n x (0.0045)) + (N t x (0.005))] x I n } <= 4.65V  
Device 1 [(18 x (0.021)) + (1 x (0.005))] x 1.0 = 0.383V  
Device 2 [(36 x (0.021))+ (2 x (0.005))] x 0.5 = 0.383V  
Device 3 [(43 x (0.021)) + (3 x (0.005))] x 0.4 = 0.367V  
Device 4 [(95 x (0.021)) + (4 x (0.005))] x 0.3 = 0.604V  
2. Add each Devices voltage together to find the total voltage.  
0.383V + 0.383V + 0.367V + 0.604V = 1.737V  
Results  
Since the total voltage does not exceed 4.65V, the system will operate properly.  
MN05001002E  
For more information visit www.eatonelectrical.com  
Page 27  
 
Intelligent Technologies QCPort System Install Manual  
November 2005  
Technical Support  
For additional information on this product,  
Please call our Customer Support Center at:  
1-800-356-1243  
For service or start-up assistance  
24 hours/day, 7 days/week,  
please call:  
1-800-498-2678  
MN05001002E  
For more information visit www.eatonelectrical.com  
Page 28  
 
Intelligent Technologies QCPort System Install Manual  
November 2005  
Company Information  
Eaton Electrical Inc. is a global leader in electrical control, power distribution and  
industrial automation products and services. Thorough advanced product development,  
world-class manufacturing methods, and global engineering services and support, Eaton  
Electrical® provides customer-driven solutions under band names such as Cutler-  
Hammer®, Durant®, Heinemann®, Holec® and MEM®, which globally serve the  
changing needs of the industrial, utility, light commercial, residential and OEM markets.  
For more information visit www.eatonelectrical.com.  
Eaton Corporation is a global diversified industrial manufacturer with 2003 sales of $8.1  
billion that is a leader in fluid power systems, electrical power quality, distribution, and  
control; automotive engine air management and fuel economy; and intelligent drivetrain  
systems for fuel economy and safety in trucks. Eaton has 51,000 employees and sell  
products in more than 50 controls. For more information visit www.eaton.com.  
Eaton Electrical  
1000 Cherrington Parkway  
Moon Township, PA 15108-4312  
USA  
Tel: 1-800-525-2000  
©2004 Eaton Corporation  
All Rights Reserved  
Printed in USA  
Publication No MN05001002E  
November 2005  
MN05001002E  
For more information visit www.eatonelectrical.com  
Page 29  
 

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