National Instruments FieldPoint FP-TB-1, FieldPoint FP-TB-3, FieldPoint FP-TB-2 Operating Instructions Manual

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FieldPoint Operating Instructions
FP-TB-1/2/3
FieldPoint Terminal Bases
These operating instructions describe the installation, features, and characteristics of the FP-TB-1, FP-TB-2, and FP-TB-3.
Features
The FP-TB-1, FP-TB-2, and FP-TB-3 are FieldPoint terminal bases with the following features:
Works with all FieldPoint I/O modules (the FP-TB-3 is designed specifically to work with thermocouple I/O modules)
V andC terminals provideexternal supply voltages common to all channels
DIN-rail mounting or panel mounting
32 terminals available for field connections (FP-TB-3 has 16)
Available with screw terminals (FP-TB-1 and FP-TB-3) or spring terminals (FP-TB-2)
Isothermal construction (FP-TB-3) minimizes temperature gradients when using thermocouples
–40 to 70 °C operation
The FP-TB-1, FP-TB-2, and FP-TB-3 terminal bases provide the intra-system communication link between FieldPoint I/O modules and network modules, provide a means for wiring field connections, and provide the mounting mechanism. You can choose your terminal base depending on the type of field wiring terminal you prefer: screw terminal or spring terminal.
FieldPoint™, National Instruments™, NI™, and ni.com™ aretrademarks of National Instruments Corporation. Product and company names mentioned herein are trademarks or trade names of their respective companies. For patents coveringNational Instrumentsproducts, refer tothe appropriate location:
patents.txt
the
321699E-01 May 2002
©
1999–2002 National Instruments Corp. All rights reserved.
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file on your CD, or
ni.com/patents
.
Help»Patents
in yoursoftware,
MountingtheFP-TB-1/2/3onaDINRail
Caution
To avoid damaging the network module and terminal base, make sure that power is not applied to the network module while you are installing or removing a terminal base.
FieldPoint terminal bases have simple rail clips for reliable mounting on a standard 35 mm DIN rail. Follow these steps to mount the terminal base on a DIN rail.
1. Write down the serial number, located on the back of the terminal base, before you mount it on the DIN rail.
2. Use a flathead screwdriver to open the DIN rail clip to the unlocked position, as shown in Figure 1.
1 2
1 Rail clip locked 2 Rail clip unlocked
Figure 1. Unlocking the Rail Clip
3. Attach the lip on the rear of the terminal base onto the top of a 35 mm DIN rail and press it down onto the DIN rail, as shown in Figure 2.
Figure 2. Attaching the Terminal Base to a DIN Rail
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4. Slide the terminal base along the DIN rail until its local bus connector mates with the connector of the terminal base or network module adjacent to it.
5. After the terminal base is in position, lock it to the DIN rail by pushing the rail clip to the locked position.
6. To add more terminal bases, install them on the rail and connect their local bus connectors together.
7. Place the protective cover onto the local bus connector of the last terminal base on the bank, as shown in Figure 3. Add rail locks by sliding them on and tightening the screws.
Figure 3. Adding Rail Locks and Protective Cover
Mounting the FP-TB-1/2/3 to a Panel
Caution
To avoid damaging the network module and terminal base, make sure that power is not applied to the network module while you are installing or removing a terminal base.
Follow these steps to mount the terminal base on a wall or panel.
1. Use Figure 4 to locate where to drill the mounting holes on the panel. Dimensions are given in millimeters [inches].
© National Instruments Corp. 3 FP-TB-1/2/3 Operating Instructions
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62.48 [2.46]
31.24 [1.23]
44.64 [1.76]
44.64 [1.76]
31.24 [1.23]
Figure 4. Locating the Mounting Holes
2. When you have located and drilled the mounting holes, mount the terminal base as shown in Figure 5.
Figure 5. Mounting the Terminal Base
3. Place the protective cover over the local bus connector of the last terminal base in the bank.
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Mounting I/O Modules on the Terminal Base
Refer to Figure 6 and follow these steps to install an I/O module on the terminal base.
1. Slide the terminal base key to the appropriate position for the I/O module. The position marked X is a universal position that works for all modules.
2. Align the alignment slots on the I/O module with the guide rails on the terminal base.
Key
Latch
Alignment
Slot
Guide Rails
Terminal BaseI/O Module
Figure 6. Mounting the I/O Module on the Terminal Base
3. Press firmly to seat the I/O module on the terminal base. When the module is firmly seated, the terminalbase latch locks it into place and the ejector button on the top of the terminal base pops up.
4. To remove an I/O module, press the ejector button on top of the terminal base and pull off the module.
© National Instruments Corp. 5 FP-TB-1/2/3 Operating Instructions
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Field Wiring
The FP-TB-1 and FP-TB-2 provide four dedicated terminals and 32 numbered terminals defined by the I/O module. The terminals are designed for 16–26 AWG copper conductor wire with 7 mm (0.28 in.) of insulation stripped from the end as shown in Figure 7. Use only copper wire unless you are working with a sensing device, such as a thermocouple, that requires a different kind of wire.
7mm
Figure 7. Conductor Wire with the Correct Strip Length
The four dedicated terminals are two V and two C terminals, one of each at both ends of the terminal base. The two V terminals are internally connected by the terminal base, as are the two C terminals. Generally, these terminals are intended to connect external power supplies to field devices. FieldPoint I/O modules get their power from the network module through the backplane, and in most cases require no external power for proper operation. Refer to the appropriate I/O module operating instructions for details on the use of these terminals and the other 32 terminals. The FP-TB-3 provides two dedicatedC terminals and 16 numbered terminals defined by the I/O module. Although the FP-TB-3 is designed specifically to work with thermocouple modules, I/O modules that do not require external power and that only use terminals 1 to 16 can be used with the FP-TB-3.
Caution
make sure that power is not applied to it.
Before you connect wires to the terminal base,
Connecting Wires to the FP-TB-1 or FP-TB-3
Follow these steps to connect wires to the FP-TB-1 or FP-TB-3.
1. Loosen the terminal screw you want to wire.
2. Insert the wire in the terminal.
3. Tighten the screw terminal to 0.5–0.6 N m (4.4–5.3 lb in.) of torque.
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Connecting Wires to the FP-TB-2
Follow these steps to connect wires to the FP-TB-2.
1. Insert a screwdriver into the slot directly below the terminal number and push the screwdriver downward into the slot. You may need to push hard. This forces the spring-loaded terminal to open.
2. Insert the wire in the terminal.
3. Withdraw the screwdriver, allowing the spring terminal to clamp securely onto the wire.
V12345678910111213141516V
C17181920212223242526272829303132C
Figure 8. Connecting Wires to the Spring Terminals of the FP-TB-2
© National Instruments Corp. 7 FP-TB-1/2/3 Operating Instructions
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Powering the FieldPoint System
Consider the following points when connecting power to the FieldPoint system.
The total current flowing through the V and C terminals must be limited to 10 A. If you have a single external supply for the field devices of more than one module, wire the supply to the V and C terminals as shown in Figure 9.
1
2
1 When total current draw is
less than 10 A
Figure 9. Connecting Power for Current Draws Below and Above 10 A
Caution
Cascading power from neighboring bases or
2 When total current draw is
greater than 10 A
network modules defeats isolation between cascaded modules.
When total current draw is less than 3 A, you can use a single terminal for the return path. If the total current draw is greater than 3 A, you should use separate C terminals, as shown in Figure 10.
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1
2
1 When total current draw is
lessthan3A
2 When total current draw is
greater than 3 A
Figure 10. Connecting Power for Current Draws Below and Above 3 A
You need to wire power to the terminal bases only if you want to use the terminal bases to route power to field devices or if the I/O module requires it. FieldPoint I/O modules get their power from the network module through the backplane and, in most cases, require no external power for proper operation. Refer to your I/O module operating instructions for details. In Figure 11, shades of gray indicate differing voltage potentials.
FP-TC-120 FP-AO-200FP-AI-110
Figure 11. Different Voltage Potentials
Caution
Cascading power from neighboring bases or
Live (V) Ground
Neutral (C)
FP-RLY-420
network modules defeats isolation between cascaded modules.
You may want to use separate power supplies for I/O modules both to prevent power dips caused by field devices from disrupting the operation of the networkmodule and tomaintain
© National Instruments Corp. 9 FP-TB-1/2/3 Operating Instructions
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the isolation barrier between the I/O modules and the network module. Figure 12 shows an example configuration with both separate power supplies and cascading power.
FP-TC-120 FP-RLY-420FP-AO-200FP-AI-110
1
2
Thermocouple (self powered)
17
V
sup
4-20 mA
Figure 12. Example Power Supply Configuration for a FieldPoint Bank
V
COM
IN
2
I
IN
+
±5V
1 18 Common
Channel 0
2
18
Caution
Cascading power from neighboring bases or network modules defeats isolation between cascaded modules.
Thermocouple Wiring
The FP-TC-120 thermocouple input module has the ability to measure the temperature of the terminals on any of the FieldPoint terminal bases. This measurement is called the cold junction
temperature and indicates the temperature of the junctions
between your thermocouple wire and the screw terminals. This measurement is used internally by the FP-TC-120 to correct for the thermoelectric voltages that are generated at these junctions.
Heat dissipated by adjacent modules (or other nearby heat sources) can cause errors in thermocouple measurements by heating up the terminals so that they are at a different temperature than the sensor used to measure the cold junction. The thermal gradient generated across the terminals can cause the terminals of different channels
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to be at different temperatures, and so the resulting measurement creates not only errors in absolute accuracy but also in the relative accuracy between channels. The accuracy specifications for the FP-TC-120 include the errors caused by a 0.2 °C (0.36 °F) gradient. The actual gradient you can expect to encounter depends on the terminal base you use and the details of your installation. The following sections provide guidelines for estimating and minimizing thermal gradients.
Estimating Thermal Gradients with the FP-TB-3 Isothermal Terminal Base
The FP-TB-3 is designed with isothermal construction to keep the terminals at the same temperature. It is the terminal base recommended for the best accuracy of thermocouple measurements. Adjacent FieldPoint modules (either network modules or I/O modules) create a thermal gradient across the terminals of the FP-TB-3, which you can estimate by dividing the larger of the amounts of heat dissipated by each of the adjacent modules by 20 W/°C(11W/°F). For example, if the FP-TB-3 is between an analog input module dissipating 0.35 W and a discrete output module dissipating 3 W, the thermal gradient would be 3W÷ 20 W/ °C = 0.15 °C.
Estimating Thermal Gradients with the FP-TB-1 or FP-TB-2 Terminal Bases
The lack of isothermal construction in the FP-TB-1 and FP-TB-2 terminal bases makes them more susceptible to errors caused by thermal gradients. These terminal bases are recommended for use with thermocouple measurements only if such errors are acceptable or if they can be minimized, as described in the
Minimizing Thermal Gradients section. Adjacent FieldPoint
modules (either network modules or I/O modules) create a thermal gradient across the terminals of the FP-TB-1, which you can estimate by dividing the larger of the amounts of heat dissipated by each of the adjacent modules by 1 W/°C (0.6 W/°F). For example, if the FP-TB-1/2 is between an analog input module dissipating
0.35 W and a discrete output module dissipating 3 W, the thermal gradient would be 3 W ÷ 1W/°C=3°C. The typical thermal gradient created by the FP-TC-120 mounted on an FP-TB-1 (neglecting any adjacent modules) is about 0.2 °C.
© National Instruments Corp. 11 FP-TB-1/2/3 Operating Instructions
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Minimizing Thermal Gradients
The most common source of thermal gradients, particularly for the FP-TB-1 and FP-TB-2, is the heat generated by adjacent modules. For example, placing an FP-TB-1 next to an FP-1000 network module can create more than a 1 °C thermal gradient. Mounted thermocouple modules can be separated from the higher-power modules by the lowest-power modules in your system or by the FieldPoint Bus Extender Cable (part number 185576-15). This precaution is generally not necessary with the FP-TB-3.
Hot or cold air draft can be another source of thermal gradients. It is usually best to avoid having air blowing directly on the terminals, although circulating air around other nearby components may help them dissipate their heat and cause them to be less of a source of thermal gradients on the terminal base.
Thermocouple wire also has the potential to be a significant source of thermal gradients. Even the FP-TB-3 can be susceptible to these errors. Heat or cold may be directly conducted to the terminal junction by the thermocouple wire. If the thermocouple wires, or objects they are in contact with, such as wiring ducts, near the terminal base are at a different temperature than the terminals, the wires transfer heat to or from the terminals and cause thermal errors. To minimize these errors, follow these guidelines:
Use small-gauge thermocouple wire. Smaller wires transfer less heat.
Run thermocouple wires together near the terminal base to keep them at the same temperature.
Avoid running thermocouple wires near hot or cold objects.
Specifications
The following specifications are typical for a range of –40 to 70 °C, unless otherwise noted.
Installation
Terminal wiring ................................ 16–26 AWG copper
conductor wire with 7 mm (0.28 in.) of insulation stripped from the end
1
Use only copper conductor wire unless you are working with a sensing
device, such as a thermocouple, that requires a different kind of wire.
FP-TB-1/2/3 Operating Instructions 12 ni.com
1
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Torque for screw terminals ............... 0.5–0.6 N ⋅ m
(4.4–5.3 lb in.)
Physical
Weight
FP-TB-1...................................... 210 g (7.4 oz)
FP-TB-2...................................... 160 g (5.7 oz)
FP-TB-3...................................... 240 g (8.5 oz)
Maximum Working Voltage
Maximum working voltage refers to the signal voltage plus the common-mode voltage.
Channel-to-earth ............................... 250 V, Installation
Category II
Channel-to-channel........................... See I/O module operating
instructions
1
Caution
Improper wiring may defeat isolation barrier.
Environmental
FieldPoint modules are intended for indoor use only.
Operating temperature ...................... –40 to 70 °C
Storage temperature ..........................–55 to 85 °C
Humidity ...........................................10 to 90% RH,
noncondensing
Maximum altitude............................. 2,000 m
Pollution degree ................................2
Safety
The FP-TB-1/2/3 meets the requirements of the following standards for safety and electrical equipment for measurement, control, and laboratory use:
EN 61010-1:1993/A2:1995, IEC 61010-1:1990/A2:1995
UL 3121:1998
CAN/CSA c22.2 no. 1010.1:1992/A2:1997
1
May vary by I/O module. See I/O module operating instructions.
© National Instruments Corp. 13 FP-TB-1/2/3 Operating Instructions
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Electromagnetic Compatibility
CE, C-Tick and FCC Part 15 (Class A) Compliant
Electrical emissions .......................... EN 55011 Class A at 10 m
FCC Part 15A above 1 GHz
Electrical immunity ..........................Evaluated to EN 61326:
1997/A1: 1998, Table 1
For full EMC compliance, you must operate this
Note
device with shielded cabling. See the Declaration of Conformity (DoC) for this product for any additional regulatory compliance information. To obtain the DoC for this product, click Declaration of Conformity at
ni.com/hardref.nsf/
.
Mechanical Dimensions
Figure 13 show the mechanical dimensions of the FP-TB-1/2/3 with an I/O module installed. Dimensions are given in millimeters [inches].
107.19 [4.22]
109.5 [4.31]
91.44 [3.60]
Figure 13. Mechanical Dimensions
Where to Go for Support
For more information about setting up your FieldPoint system, refer to these National Instruments documents:
Your FieldPoint network module user manual
Your other FieldPoint I/O module operating instructions
Your FieldPoint terminal base operating instructions
Go to
ni.com/support
and troubleshooting information.
FP-TB-1/2/3 Operating Instructions 14 ni.com
for the most current manuals, examples,
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For telephone support in the United States, create your service request at
ni.com/ask
and follow the calling instructions or dial 512 795 8248. For telephone support outside the United States, contact your local branch office:
Australia 03 9879 5166, Austria 0662 45 79 90 0, Belgium 02 757 00 20, Brazil 011 3262 3599, Canada (Calgary) 403 274 9391, Canada (Montreal) 514 288 5722, Canada (Ottawa) 613 233 5949, Canada (Québec) 514 694 8521, Canada (Toronto) 905 785 0085, China (Shanghai) 021 6555 7838, China (ShenZhen) 0755 3904939, Czech Republic 02 2423 5774, Denmark 45 76 26 00, Finland 09 725 725 11, France 01 48 14 24 24, Germany 089 741 31 30, Greece 30 1 42 96 427, Hong Kong 2645 3186, India 91 80 4190000, Israel 03 6393737, Italy 02 413091, Japan 03 5472 2970, Korea 02 3451 3400, Malaysia 603 9596711, Mexico 001 800 010 0793, Netherlands 0348 433466, New Zealand 09 914 0488, Norway 32 27 73 00, Poland 0 22 3390 150, Portugal 351 210 311 210, Russia 095 238 7139, Singapore 6 2265886, Slovenia 386 3 425 4200, South Africa 11 805 8197, Spain 91 640 0085, Sweden 08 587 895 00, Switzerland 056 200 51 51, Taiwan 02 2528 7227, United Kingdom 01635 523545
© National Instruments Corp. 15 FP-TB-1/2/3 Operating Instructions
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Artisan Technology Group is your source for quality
new and certied-used/pre-owned equipment
FAST SHIPPING AND
DELIVERY
TENS OF THOUSANDS OF IN-STOCK ITEMS
• EQUIPMENT DEMOS
HUNDREDS OF MANUFACTURERS
SUPPORTED
• LEASING/MONTHLY RENTALS
• ITAR CERTIFIED SECURE ASSET SOLUTIONS
SERVICE CENTER REPAIRS
Experienced engineers and technicians on staff at our full-service, in-house repair center
Instra
Remotely inspect equipment before purchasing with our interactive website at www.instraview.com
Contact us: (888) 88-SOURCE | sales@artisantg.com | www.artisantg.com
SM
REMOTE INSPECTION
View
WE BUY USED EQUIPMENT
Sell your excess, underutilized, and idle used equipment We also offer credit for buy-backs and trade-ins
www.artisantg.com/WeBuyEquipment
LOOKING FOR MORE INFORMATION?
Visit us on the web at www.artisantg.com for more information on price quotations, drivers, technical
specications, manuals, and documentation
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