INSTALLATION INSTRUCTIONS NI TBX-2808 Screw Terminal Accessory for the NI SwitchBlock This installation guide describes how to install and connect signals to the NI TBX-2808 screw terminal accessory for use with NI SwitchBlock cards. The NI TBX-2808 is an unshielded, DIN-rail mountable terminal breakout block that consists of a printed circuit board with screw terminals that provide connections to all channels of a single NI SwitchBlock card. The NI TBX-2808 includes a safety interlock resistor to engage the NI SwitchBlock card s safety relays, allowing connections to the NI SwitchBlock analog bus. Specifications Maximum voltage... 100 V, CAT I (row/column-to-ground) Maximum current (per screw terminal)... 2 A Maximum current (per terminal block)... 64 A Caution This product is rated for Measurement Category I. Do not use this product for connection to signals or for measurements within Categories II, III, or IV. Caution The maximum voltage is limited to the lowest voltage of any component in the NI SwitchBlock system. Review the specifications of the NI SwitchBlock carrier and cards. Caution The NI TBX-2808 must be installed inside a suitably rated enclosure with proper cable/wire strain relief(s) prior to use. There are no user serviceable parts inside. Do not change or alter this product in any way. Caution NI products typically must be operated with shielded cables and accessories to ensure compliance with Electromagnetic Compatibility (EMC) requirements. To determine if shielded cables or accessories are required for the product that the NI TBX-2808 will be used with, refer to the EMC specifications in the product s user guide or manual. If shielded cables or accessories are required for EMC compliance, do not use unshielded cables or accessories unless they are installed in a shielded enclosure with properly designed and shielded input/output ports, and are connected to the NI product using a shielded cable. If unshielded cables or accessories are not properly installed and shielded, the EMC specifications for the product are no longer guaranteed.
Caution The protection provided by this product may be impaired if it is used in a manner not described in this document. Compatible DIN rails...din EN 50 022 DIN EN 50 035 Dimensions (L W H)...19.8 12.8 8.5 cm (7.8 5.0 3.4 in.) Weight...398 g (14 oz) What You Need to Get Started You need the following items to set up and use your screw terminal accessory: One NI SwitchBlock card and specifications NI TBX-2808 screw terminal accessory SH160F-160M-NI SwitchBlock cable 1/10 in. (2.5 mm) flathead screwdriver #1 Phillips-head screwdriver Wire cutters Wire insulation strippers Signal Connection Refer to Figure 1 and perform the following steps to connect your signals to your screw terminal accessory: 1. Unscrew the four cover screws with a Phillips-head screwdriver to remove the cover. 2. Use wire cutters and wire insulation strippers to strip the wire ends as necessary to connect them to screw terminals. 3. Loosen the screws in the screw terminals with a 1/10 in. (2.5 mm) flathead screwdriver. 4. Insert the stripped wires into the screw terminals, and tighten the screws with a 1/10 in. (2.5 mm) flathead screwdriver. 5. Allow the signal wires to exit through the cover opening. Note The NI TBX-2808 screw terminal accessory does not provide strain relief for signal wires. Add strain relief and insulation for your signal wires, if necessary. 6. Replace the cover and tighten the cover screws. 7. If using a shielded cable, connect the cable shield to the earth ground terminal. NI TBX-2808 Installation Instructions 2 ni.com
2 1 3 1 4 1 Cover Screws 2 Cover 3 Cover Opening 4 Screw Terminals Figure 1. NI TBX-2808 Parts Locator Diagram Installing Your Screw Terminal Accessory Refer to Figure 2 and perform the following steps to connect the screw terminal accessory to the NI SwitchBlock card connector: 1. Securely fasten the connector on one end of the cable to the NI SwitchBlock card connector using the thumbscrews. 2. Securely fasten the connector on the other end of the cable to the screw terminal accessory connector using the thumbscrews. To disconnect the cable, unscrew the cable and gently pull on the backshell. Do not pull the cable. National Instruments 3 NI TBX-2808 Installation Instructions
Caution The connectors of both the NI SwitchBlock card and the cable are polarized. You can attach them in only one way. Tie the ground terminal to an earth ground to ground the screw terminal end of the cable shield. Do not force the cable when inserting it into or removing it from the NI SwitchBlock card connector. 2 1 5 3 4 6 7 1 NI SwitchBlock carrier 2 Thumbscrews 3 SH160F-160M-NI SwitchBlock cable 4 Cable backshells 5 Ground terminal 6 NI TBX-2808 7 Signal wires Figure 2. Connecting the Cable Assembly NI TBX-2808 Installation Instructions 4 ni.com
Refer to Figure 3 for NI TBX-2808 pinouts. D32W1 E32W0 D31W1 E31W0 B30W1 C30W0 D30W1 E30W0 A30W1 A29W0 B29W1 C29W0 D29W1 E29W0 B28W1 C28W0 D28W1 E28W0 A28W1 A27W0 B27W1 C27W0 D27W1 E27W0 B26W1 C26W0 D26W1 E26W0 A26W1 A25W0 B25W1 C25W0 D25W1 E25W0 B24W1 C24W0 D24W1 E24W0 A24W1 A23W0 B23W1 C23W0 D23W1 E23W0 B22W1 C22W0 D22W1 E22W0 A22W1 A21W0 B21W1 C21W0 D21W1 E21W0 B20W1 C20W0 D20W1 E20W0 A20W1 A19W0 B19W1 C19W0 D19W1 E19W0 B18W1 C18W0 D18W1 E18W0 A18W1 A17W0 B17W1 C17W0 D17W1 E17W0 B16W1 C16W0 D16W1 E16W0 B13W1 C13W0 D13W1 E13W0 A14W1 A13W0 B14W1 C14W0 D14W1 E14W0 B15W1 C15W0 D15W1 E15W0 A16W1 A15W0 A10W1 A9W0 B10W1 C10W0 D10W1 E10W0 B11W1 C11W0 D11W1 E11W0 A12W1 A11W0 B12W1 C12W0 D12W1 E12W0 D6W1 E6W0 B7W1 C7W0 D7W1 E7W0 A8W1 A7W0 B8W1 C8W0 D8W1 E8W0 B9W1 C9W0 D9W1 E9W0 D3W1 E3W0 A4W1 A3W0 B4W1 C4W0 D4W1 E4W0 B5W1 C5W0 D5W1 E5W0 A6W1 A5W0 C6W1 B6W0 NC NC B1W1 C1W0 D1W1 E1W0 A2W1 A1W0 B2W1 C2W0 D2W1 E2W0 B3W1 C3W0 Figure 3. NI TBX-2808 Pinouts National Instruments 5 NI TBX-2808 Installation Instructions
Mounting the NI TBX-2808 When you have completed signal connections and terminal block installation, you can directly mount the NI TBX-2808 assembly onto a DIN rail with a firm push. To unmount the NI TBX-2808 from the DIN rail, place a flathead screwdriver into the slot above the terminal block base and pry it away from the rail. Environment Operating temperature...0 C to 55 C Storage temperature... 20 C to 70 C Relative humidity...5% to 85%, noncondensing Pollution Degree...2 Maximum altitude...2,000 m Indoor use only. Compliance and Certifications Safety This product is UL Recognized as a component and meets the requirements of the following standards of safety for electrical equipment for measurement, control, and laboratory use: IEC 61010-1, EN 61010-1 UL 61010-1, CSA 61010-1 Caution Refer to the Read Me First: Safety and Electromagnetic Compatibility document for important safety and electromagnetic compatibility information. To obtain a copy of this document online, visit ni.com/manuals, and search for the document title. Note For UL and other safety certifications, refer to the product label or the Environmental Management section. CE Compliance This product meets the essential requirements of applicable European Directives as follows: 2006/95/EC; Low-Voltage Directive (safety) 2004/108/EC; Electromagnetic Compatibility Directive (EMC) Environmental Management NI is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial to the environment and to NI customers. NI TBX-2808 Installation Instructions 6 ni.com
For additional environmental information, refer to the NI and the Environment Web page at ni.com/environment. This page contains the environmental regulations and directives with which NI complies, as well as other environmental information not included in this document. Waste Electrical and Electronic Equipment (WEEE) EU Customers At the end of the product life cycle, all products must be sent to a WEEE recycling center. For more information about WEEE recycling centers, National Instruments WEEE initiatives, and compliance with WEEE Directive 2002/96/EC on Waste Electrical and Electronic Equipment, visit ni.com/ environment/weee. RoHS National Instruments (RoHS) National Instruments RoHS ni.com/ environment/rohs_china (For information about China RoHS compliance, go to ni.com/environment/rohs_china.) National Instruments 7 NI TBX-2808 Installation Instructions
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