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National Instruments Isolated Current Output Module SCC-CO20 User Manual Download Page 11

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 National Instruments Corporation

11

SCC-CO20 Isolated Current Output Module User Guide

Physical

Figure 6.  

SCC-CO20 Dimensions

Weight .................................................... 28 g (1.0 oz)

I/O connectors ........................................ One 20-pin right-angle male 

connector
One 3-pin screw terminal

Field-wiring diameter............................. 28 to 16 AWG

Maximum Working Voltage

( common-mode) each input should remain within 42.4 V

peak

 or 

60 VDC of ground.

Maximum working voltage refers to the signal voltage plus the CMV.

Channel-to-earth (inputs) ....................... 42.4 V

peak

 or 60 VDC, 

Measurement Category I

Caution

This device is rated for Measurement Category I and is intended to carry signal 

voltages no greater than 42.4 V

peak

 or 60 VDC. Do not use this device for connection to 

signals or for measurements within Categories II, III, or IV.

Isolation Voltage

Channel-to-earth isolation

Continuous ...................................... 60 VDC,

Measurement Category I

Withstand ........................................ 2300 V

rms

 verified by a 5 s 

dielectric withstand type test

1.87 cm 

(0.74 in.) 

7.93 cm 

(3.12 in.) 

3.55 cm 

(1.4 in.) 

Summary of Contents for Isolated Current Output Module SCC-CO20

Page 1: ...ile menu select the Page Setup item and select Options from the last dialog box This icon denotes a note which alerts you to important information This icon denotes a caution which advises you of precautions to take to avoid injury data loss or a system crash When this symbol is marked on the product refer to the Read Me First Safety and Radio Frequency Interference document shipped with the produ...

Page 2: ...d extensions SC 2345 SC 2345 refers to both the SC 2345 connector block and the SC 2345 with configurable connectors SCC SCC refers to any SCC Series signal conditioning module What You Need to Get Started To set up and use the SCC CO20 you need the following items Hardware SC 2345 2350 with one of the following SCC PWR01 SCC PWR02 and the PS01 power supply SCC PWR03 requires a 7 to 42 VDC power s...

Page 3: ...r to the SCC Quick Start Guide available for download at ni com manuals Installing the SCC CO20 Caution Refer to the Read Me First Safety and Radio Frequency Interference document before removing equipment covers or connecting disconnecting any signal wires Plug the SCC CO20 into either SC 2345 2350 analog output socket J X 17 where X is 0 or 1 The SC 2345 2350 routes the voltage output of E M Ser...

Page 4: ...the isolated ground reference When using the internal loop supply the compliance voltage is 12 5 V This allows for a maximum load resistance of 625 Ω at 20 mA Figure 2 shows how to connect the SCC CO20 using the internal loop supply to a nonreferenced floating load and to a load with a high common mode voltage Figure 2 Connecting the SCC CO20 Using the Internal Loop Supply AO GND E M Series DAQ De...

Page 5: ...ply voltage your application requires multiply the load resistance by the current you need to sink then add 2 5 V for the voltage drop across the protection diode and the current sink MOSFET If you need a higher voltage than the 15 V provided by the internal loop supply you can either add a second SCC CO20 module or provide an external loop supply Adding a Second SCC CO20 Module You can add anothe...

Page 6: ...O20 Isolated Current Output Module User Guide 6 ni com Figure 3 Connecting Two SCC CO20 Modules to a Higher Resistance Load SCC CO20 1 2 15 V iso 3 SCC CO20 1 2 15 V iso 3 Load SUPPLY SINK ISO GND SUPPLY I I ...

Page 7: ...necting the SCC CO20 Using an External Loop Supply When you use an external loop supply the order of the supply and load does not matter as long as you do not create a second loop through which current flows If both the supply and the load are grounded connect the signals as shown in Figure 5 High CMV High CMV 1 2 Load SINK SCC CO20 ISO GND I a Nonreferenced load and external voltage supply two ci...

Page 8: ...he gain and offset of the SCC CO20 complete the following steps 1 Disconnect the load from the SCC CO20 you want to calibrate 2 Set an output range of 0 to 10 V for AO X the E M Series DAQ device channel connected to the SCC CO20 3 Connect the negative lead of the ammeter to the current sink pin 2 and the positive lead to the current supply pin 3 of the SCC CO20 4 Using your software have AO X out...

Page 9: ...is described by the following equation where VAO X is the AO X voltage level ICO20 is the SCC CO20 current output in amperes The current sink is an N channel power MOSFET sink to an isolated ground reference You can use the SCC CO20 with industry standard 0 to 20 or 4 to 20 mA current loops Note The current sink does not source current If the input voltage is 0 V or less the module sinks 0 mA Isol...

Page 10: ...ferencing Nonreferenced floating Input range 0 to 10 V Output range 0 to 20 mA Voltage compliance 12 5 V Maximum load resistance 5 mA 2 500 Ω 10 mA 1 250 Ω 15 mA 830 Ω 20 mA 625 Ω Absolute accuracy 0 1 of full scale output range Temperature drift 0 5 μA C typ 1 μA C max Power Requirement Analog power 175 mW max 15 V 5 8 mA max 15 V 5 8 mA max Digital power 5 V 645 mW 5 V 129 mA max ...

Page 11: ...ximum working voltage refers to the signal voltage plus the CMV Channel to earth inputs 42 4 Vpeak or 60 VDC Measurement Category I Caution This device is rated for Measurement Category I and is intended to carry signal voltages no greater than 42 4 Vpeak or 60 VDC Do not use this device for connection to signals or for measurements within Categories II III or IV Isolation Voltage Channel to earth...

Page 12: ...ct meets the requirements of the following EMC standards for electrical equipment for measurement control and laboratory use EN 61326 IEC 61326 Class A emissions Basic immunity EN 55011 CISPR 11 Group 1 Class A emissions AS NZS CISPR 11 Group 1 Class A emissions FCC 47 CFR Part 15B Class A emissions ICES 001 Class A emissions Note For the standards applied to assess the EMC of this product refer t...

Page 13: ... beneficial to the environment and to NI customers 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 lif...

Page 14: ...n the bottom of the module Figure 7 SCC CO20 Bottom View Table 1 lists the signal connection corresponding to each pin 1 Pin 1 2 Pin 2 3 PWB Key 4 Pin 19 5 Pin 20 Table 1 SCC CO20 Pin Signal Connections Pin Number Signal 1 E M Series AO X 2 E M Series AO GND 3 4 E M Series AO GND 5 6 7 8 9 5 V 10 GND 11 12 5 V REF 13 15 V 5 4 2 1 3 ...

Page 15: ...are trademarks or trade names of their respective companies For patents covering National Instruments products technology refer to the appropriate location Help Patents in your software the patents txt file on your media or the National Instruments Patent Notice at ni com patents 2002 2008 National Instruments Corporation All rights reserved 371078D 01 Aug08 14 15 V 15 16 17 18 19 20 Table 1 SCC C...

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