National Instruments TBX-1329 Installation Manual

National Instruments TBX-1329 Installation Manual

Ac/dc coupling terminal block
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INSTALLATION GUIDE
TBX-1329 AC/DC C
Introduction
What You Need to Get Started
National Instruments
, ni.com
trademarks or trade names of their respective companies.
371215A-01
© Copyright 1997, 2000 National Instruments Corp. All rights reserved.
This guide describes how to install and use the TBX-1329 AC/DC coupling
terminal block with the SCXI-1120, SCXI-1120D, SCXI-1121,
SCXI-1125, and SCXI-1126 modules.
The TBX-1329 is a shielded, DIN-rail mountable terminal block with
screw terminals to connect to the SCXI-1120, SCXI-1120D, SCXI-1121,
SCXI-1125, or SCXI-1126 front connector. The TBX-1329 mounts on
most European standard DIN EN mounting rails.
The terminal block has 16 screw terminals for easy connection. Two screws
are provided to connect to the SCXI functional earth terminal through the
SH32-32-A cable shield. With the SCXI-1120, SCXI-1120D, SCXI-1125,
or SCXI-1126, the remaining eight pairs of screw terminals connect signals
to the eight SCXI module input channels. With the SCXI-1121, four pairs
of screw terminals connect signals to the four SCXI module input channels
and four pairs connect to the SCXI module excitation channels.
To set up and use your TBX-1329, you need the following:
TBX-1329 AC/DC coupling terminal block
TBX-1329 AC/DC Coupling Terminal Block Installation Guide
1/8 in. flathead screwdriver (included in kit)
SCXI chassis and documentation
, and SCXI
are trademarks of National Instruments Corporation. Product and company names mentioned herein are
T
OUPLING
ERMINAL
B
LOCK
December 2000

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Summary of Contents for National Instruments TBX-1329

  • Page 1 TBX-1329 AC/DC C OUPLING ERMINAL LOCK This guide describes how to install and use the TBX-1329 AC/DC coupling terminal block with the SCXI-1120, SCXI-1120D, SCXI-1121, SCXI-1125, and SCXI-1126 modules. Introduction The TBX-1329 is a shielded, DIN-rail mountable terminal block with screw terminals to connect to the SCXI-1120, SCXI-1120D, SCXI-1121, SCXI-1125, or SCXI-1126 front connector.
  • Page 2: Safety Information

    If signal wires are connected to the device, hazardous voltages can exist even when the equipment is turned off. To avoid a shock hazard, do not perform procedures involving cover or shield removal unless you are qualified to do so and disconnect all field TBX-1329 Installation Guide ni.com...
  • Page 3 If the device is damaged, turn the device off and do not use it until service-trained personnel can check its safety. If necessary, return the device to National Instruments for service and repair to ensure that its safety is not compromised.
  • Page 4 National Instruments is not liable for any damages or injuries resulting from inadequate safety earth-ground connections. Do not loosen or re-orient the safety-ground lug hardware when connecting the safety-ground wire; to do so reduces the safety isolation between the high voltage and safety ground.
  • Page 5: Measuring Current

    SCXI module by using shorter cable lengths, or use heavy-gauge wire to connect to the TBX-1329. Measuring Current To measure current with the TBX-1329, you can place a current loop receiver resistor in the sockets on the TBX-1329. Table 1 shows the TBX-1329 socket assignment per channel.
  • Page 6 Configuring AC/DC Coupling Each channel of the TBX-1329 has two switches you can use to switch from AC to DC; thus, you can configure each channel individually. The factory-default setting for the switches is the DC position so that the terminal block passes all signals, DC and AC, to the SCXI module.
  • Page 7: Connecting The Signals

    When connecting your signals to the TBX-1329, follow the labeling on the TBX-1329 for the appropriate module, as indicated in Figure 1. When using the TBX-1329 with the SCXI-1125 or SCXI-1126, follow the SCXI-1120/1120D labeling.
  • Page 8 Tighten the terminals to a torque of 5-7 in.-lb (56-79 Newton cm). Relieve strain on your signal wires by tie-wrapping them to the mounting rails of your rack. Replace the TBX-1329 terminal block cover and tighten the captive cover screws. 1 Safety Ground Lugs...
  • Page 9 The signal connection is now complete. Installing the Cable and Terminal Block Perform the following steps to mount the SH32-32-A cable assembly and connect the TBX-1329 to your SCXI module. Refer to Figures 3 through 5 as needed. Turn off your SCXI chassis.
  • Page 10 1 Backshell Mounting Screws and 2 Cable Assembly 4 SCXI Chassis Ears 3 Thumb Screws 5 TBX Cable Adapter Figure 3. Connecting the SH32-32-A Cable to the SCXI Module TBX-1329 Installation Guide ni.com...
  • Page 11 Note: The SH32-32-A cable is not shown in the exact position for proper connection to the terminal block connector. See Figure 5 for the completed connection. Figure 4. Connecting the SH32-32-A Cable to the TBX-1329 Terminal Block Connect one end of the cable assembly to your SCXI module front connector and secure the SH32-32-A cable by tightening both backshell mounting screws.
  • Page 12 Rack Mounting When you have completed the installation, you are ready to mount the TBX assembly in your rack. If you are using the National Instruments TBX Rack-Mount Assembly, refer to the TBX Rack-Mount Installation Guide for instructions. If you are not using this rack-mount assembly, perform the following steps to mount the TBX assembly directly onto your DIN rail: Snap the TBX terminal block onto the DIN rail with a firm push.
  • Page 13: Specifications

    You must configure the excitation output channels for DC coupling. In instrumentation terminology, DC coupling means that both DC and AC signals are passed. AC coupling means that DC signals are blocked and AC signals are passed. © National Instruments Corporation TBX-1329 Installation Guide...
  • Page 14 Relative humidity ........10 to 90% noncondensing Altitude (maximum) .......2000 m Safety Designed in accordance with IEC 61010-1, UL 3111-1, and CAN/CSA C22.2 No. 1010.1 for electrical measuring and test equipment Installation Category II Pollution degree 2 TBX-1329 Installation Guide ni.com...
  • Page 15: Technical Support Resources

    Technical Support Resources NI Web Support National Instruments Web support is your first stop for help in solving installation, configuration, and application problems and questions. Online problem-solving and diagnostic resources include frequently asked questions, knowledge bases, product-specific troubleshooting wizards, manuals, drivers, software updates, and more.
  • Page 16 Japan 03 5472 2970, Korea 02 596 7456, Mexico 5 280 7625, Netherlands 0348 433466, New Zealand 09 914 0488, Norway 32 27 73 00, Poland 0 22 528 94 06, Portugal 351 1 726 9011, Singapore 2265886, Spain 91 640 0085, Sweden 08 587 895 00, Switzerland 056 200 51 51, Taiwan 02 2528 7227, United Kingdom 01635 523545...

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