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NATIONAL
INSTRUMENTS
The Software is the Instrument
TBX-1325 High-Voltage Terminal Block
This guide describes how to install and use the TBX-1325 high-voltage terminal block with the
SCXI-1124 module.
Introduction
The TBX-1325 high-voltage terminal block is a DIN rail-mountable terminal block with 30
screw terminals for easy connection to the SCXI-1124 front connector. Six of the screw
terminals connect to the SCXI chassis ground via the SH48-48-A cable. The remaining 24 screw
terminals are for signal connection to the six module output channels. The TBX-1325 mounts on
most European standard DIN EN mounting rails.
What You Need to Get Started
TBX-1325 high-voltage terminal block kit
TBX-1325 high-voltage terminal block
TBX-1325 High-Voltage Terminal Block Installation Guide
1
/
in. flathead screwdriver
8
SCXI chassis
SCXI-1124 module and documentation
SH48-48-A cable assembly
Long-nose pliers
3 /
in. wrench
16
No. 1 Phillips-head screwdriver
_____________________________
Product and company names are trademarks or trade names of their respective companies.
321033A-01
®
®
© 1996 National Instruments Corporation. All rights reserved.
Installation Guide
March 1996
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Summary of Contents for National Instruments TBX-1325
- Page 1 The Software is the Instrument ® TBX-1325 High-Voltage Terminal Block This guide describes how to install and use the TBX-1325 high-voltage terminal block with the SCXI-1124 module. Introduction The TBX-1325 high-voltage terminal block is a DIN rail-mountable terminal block with 30 screw terminals for easy connection to the SCXI-1124 front connector.
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Page 2: Installation
Installation Perform the following steps to mount the SH48-48-A cable assembly and connect the TBX-1325 to your SCXI-1124 module. Refer to Figures 1 and 2 as needed. Warning: : Refer to the Signal Connection section connecting HOCK HAZARD BEFORE signals. If signal wires are connected to the terminal block, dangerous voltages may exist even when the equipment is turned off. - Page 3 Grounding Screw Lock Washers Nuts Jack Screws Figure 2. Preparing the SCXI Module for the Cable Assembly 10. Slide the SCXI module back into place in the SCXI chassis.
- Page 4 11. Verify that the backshell mounting ears are in the position shown in Figure 3. If not, remove the backshell mounting ears and install them in the position shown. 12. Connect one end of the cable assembly to your SCXI module front connector and secure the SH48-48-A cable by tightening both backshell mounting screws.
- Page 5 13. Connect the other end of the cable assembly to your TBX-1325 terminal block connector and secure the SH48-48-A cable by tightening both backshell mounting screws. See Figure 4. See Figure 5 for the completed installation. Backshell Mounting Screws and Ears 3...
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Page 6: Rack Mounting
When connecting your field signals to the TBX-1325 high-voltage terminal block for use with the SCXI-1124, follow the labeling on the TBX-1325 that matches the signal names from the SCXI-1124 User Manual. For information regarding the function and use of the SCXI-1124 signals, consult your SCXI-1124 User Manual. -
Page 7: Voltage Drops
You then need to calculate the voltage drop across the field signal wires you are connecting to the TBX-1325. For example, 30 m of 22 AWG stranded copper wire has about 1.5 Ω of resistance. Thus, driving a load 15 m away at 5 mA will produce an error at the load of 7.5 mV. -
Page 8: Wiring Instructions
Wiring Instructions To connect your field signals to the TBX-1325 terminal block, refer to Figures 4 and 6 as you perform the following instructions: 1. Remove the TBX-1325 terminal block cover by unscrewing the four captive cover screws in the cover corners. These screws stay attached to the cover without falling out. -
Page 9: Specifications
Cable Mating Connector Assembly Number Product Name Signal Wire Screw Terminals Chassis Ground Screw Terminal Figure 6. TBX-1325 Parts Locator Diagram Specifications Common-mode isolation........250 Vrms between channels, and channel to earth ground Compatible DIN rails........DIN EN 50 022 DIN EN 50 035...
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