FP-SG-140 AND CFP-SG-140
Contents
1. Type 0f ADC niner Delta sigma Input signal ranges software selectable per channel Nominal With Overranging 3 5 mV V 3 90625 mV V 7 5 mV V 7 8125 mV V 30 mV V 31 25 mV V 60 mV V 62 5 mV V Filter setting Soannen 15 60 240 Hz Excitation voltage s es 2 5 5 10 V current is limited to 21 mA per channel Pulse frequency and width Filter Setting Hz Pulse Width ms Pulse Frequency s 15 324 1 15 60 116 0 95 240 70 0 90 FP SG 140 and cFP SG 140 12 ni com Figure 8 shows how the pulse frequency and width are defined 1 Pulse Frequency 2 Pulse Width Figure 8 Pulse Width and Pulse Frequency All channel update rate Filter Setting Hz Update Rate s 15 1 15 60 0 95 240 0 90 Input impedance eee 20 MQ Offset error PAO 392 ERTE A 7 6 uV typ 28 uV max 40 to 70 C 50 uV typ 140 uV max Gain error IS 10 35 C ruranini 0 06 of full scale fs 40 to 70 C 0 4 fs Input noise 60 Hz filter BBLS VV oieee 3 LSB peak to peak 7 5 mV V 2 LSB peak to peak Other ranges oo cssisessscviesssovses 1 LSB peak to peak Physical Characteristics Tndicat Or 0 cccccsssseccesesseeeesseeeees Green POWER and READY indicators eight red overcurrent indicators National Instruments Corp 13 FP SG 140 and cFP SG 140 Weight FP SG 14 0 00 ceeeeeneeeeee 140 g 4 8 oz cFP SG 140 12. mV V per 500 Ib of force applied to it To convert readings to lb multiply the output of the c FP SG 140 by 500 If the c FP SG 140 has a reading of National Instruments Corp 9 FP SG 140 and cFP SG 140 0 75 mV V the force in pounds that is applied to the load cell is 375 lb as shown in the following calculation 0 75 x 500 375 Ib Status Indicators Figure 7 shows the c FP SG 140 status indicators POWER READY eco o nrn ew a a eo ex Figure 7 Status Indicators The c FP SG 140 has two green status LEDs POWER and READY After you insert the c FP SG 140 into a terminal base or backplane and apply power to the connected network module the green POWER indicator lights and the c FP SG 140 informs the network module of its presence When the network module recognizes the c FP SG 140 it sends initial configuration information to the c FP SG 140 After receiving this initial information the green READY indicator lights and the c FP SG 140 is in normal operating mode In addition to the green POWER and READY indicators each channel has a numbered red LED that indicates overcurrent conditions When a transducer draws more than 21 mA from the excitation terminal the red LED for that channel lights and an overcurrent error is reported to the network module This also occurs if the Vexc output is shorted to ground Upgrading the FieldPoint Firmware You may need to upgrade the Field
3. 10 g 3 7 oz Power Requirements Power from network module 1W Isolation Voltage Channel to channel isolation No isolation between channels Transient overvoltage cceeeeeee 2 300 Vms Environmental FieldPoint modules are intended for indoor use only For outdoor use they must be mounted inside a sealed enclosure Operating temperature 0 0 40 to 70 C Storage temperature 55 to 85 C Humidity einne ined ene e 10 to 90 RH noncondensing Maximum altitude cceeeeees 2 000 m Pollution Degree sses 2 Shock and Vibration Operating shock IEC 68 2 27 CFP SG 140 cece ccccceseeeseeeee 50 g 3 ms half sine 3 shocks 30 g 11 ms half sine 3 shocks Operating vibration random IEC 60068 2 34 FP SG 14 0 0 eeeeeeeseeeeeeeeteeeeees 10 500 Hz 2 2 gims cFP SG 140 10 500 Hz 5 gums Operating vibration sinusoidal IEC 60068 2 6 C FP SG 140 ooeec 10 500 Hz 5 g Safety The c FP SG 140 is designed to meet the requirements of the following standards for safety and electrical equipment for measurement control and laboratory use e EN 61010 1 IEC 61010 1 FP SG 140 and cFP SG 140 14 ni com e UL3121 1 e CAN CSA C22 2 No 1010 1 For certifications under regulatory standards including hazardous location standards refer to the product label or to ni com Electromagnetic Compatibility CE C Tick and FCC Part 15 Class A Compliant Electromagnetic emissio
4. 40 The FP SG 140 mounts on a FieldPoint terminal base FP TB x Hot plug and play enables you to install the FP SG 140 onto a powered terminal base without disturbing the operation of other modules or terminal bases The FP SG 140 receives operating power from the terminal base To install the FP SG 140 refer to Figure 1 and complete the following steps 1 Slide the terminal base key to either position X used for any module or position 1 used for the FP SG 140 2 Align the FP SG 140 alignment slots with the guide rails on the terminal base 3 Press firmly to seat the FP SG 140 on the terminal base When the module is firmly seated the terminal base latch locks it into place Slot Guide Rails 1 O Module Terminal Base Figure 1 Installing the Module Installing the cFP SG 140 The cFP SG 140 mounts on a Compact FieldPoint backplane cFP BP x Hot plug and play enables you to install the cFP SG 140 onto a powered backplane without disturbing the operation of other modules or connector blocks The cFP SG 140 receives operating power from the backplane FP SG 140 and cFP SG 140 2 ni com To install the cFP SG 140 refer to Figure 2 and complete the following steps 1 Align the captive screws on the cFP SG 140 with the holes on the backplane The alignment keys on the cFP SG 140 prevent backward insertion 2 Press firmly to seat the cFP SG 140 on the backplane Using a number 2 Phillips s
5. FP SG 140 ano cFP SG 140 Eight Channel Strain Gauge Input Modules These operating instructions describe how to install and use the FP SG 140 and cFP SG 140 strain gauge input modules referred to inclusively as the c FP SG 140 For information about configuring and accessing the c FP SG 140 over a network refer to the user manual for the FieldPoint network module you are using Features The c FP SG 140 is a FieldPoint strain gauge input module with the following features e Internal support for full and half bridge configurations with programmable bridge completion e Programmable excitation for each channel 2 5 5 or 10 V e Four input ranges 3 5 7 5 30 and 60 mV V with overranging Three filter settings 15 60 and 240 Hz e 16 bit resolution 2 300 Vms transient overvoltage protection between the inter module communication bus and the I O channels e 40 to 70 C operation e Hot plug and play FieldPoint National Instruments NI and ni com are trademarks of National Instruments Corporation Product and company names mentioned herein are trademarks or trade names of their respective companies For patents covering National Instruments products refer to the appropriate location Help Patents in your software the patents txt file on your CD orni com patents 323346A 01 October 2002 instruments 2002 National Instruments Corp All rights reserved Installing the FP SG 1
6. Point firmware when you add new I O modules to the FieldPoint system For information on determining which firmware you need and how to upgrade go to ni com info and enter fpmatrix Isolation and Safety Guidelines UN Caution Read the following information before attempting to connect the c FP SG 140 to any circuits that may contain hazardous voltages FP SG 140 and cFP SG 140 10 ni com This section describes the isolation of the c FP SG 140 and its compliance with international safety standards The field wiring connections are isolated from the backplane and the inter module communication bus The isolation is provided by the module which has optical and galvanic isolation barriers designed and tested to protect against transient fault voltages of up to 2 300 Vins Follow these guidelines to ensure a safe total system e The c FP SG 140 has a safety isolation barrier between the T O channels and the inter module communication bus There is no isolation between channels unless otherwise noted If any of the channels on a module are wired at a hazardous potential make sure that all other devices or circuits connected to that module are properly insulated from human contact e Do not share the external supply voltages the V and C terminals with other devices including other FieldPoint devices unless those devices are isolated from human contact e For Compact FieldPoint you must connect the protective earth PE ground te
7. V Overranging enables the c FP SG 140 to compensate for field devices with span errors of up to 12 Also with the overranging feature a noisy signal near full scale does not create rectification errors Channel Attributes The Channel Attributes panel has an Attribute pulldown menu from which you choose the attribute you want to configure Noise Rejection Excitation Voltage or Half Bridge Completion Noise Rejection Each analog input channel has a software enabled comb filter that you can set to reject frequencies above 15 60 or 240 Hz Excitation Voltage You can choose 2 5 5 or 10 V excitation for each channel The current limit is 21 mA Table 2 shows the minimum bridge resistance at each excitation voltage level Table 2 Minimum Bridge Resistance Excitation Voltage Minimum Bridge Resistance 2 5 V 120 Q 5V 240 Q 10 V 4179 If the bridge resistance is lower than the minimum value for the excitation voltage level the readings are not valid and the red LED for the channel lights indicating an overcurrent error National Instruments Corp 7 FP SG 140 and cFP SG 140 Half Bridge Completion You can enable or disable half bridge completion for each channel Enable half bridge completion for half bridge and quarter bridge sensors When a channel is configured with the Half Bridge Completion ON attribute value the Vin input is internally disconnected from the screw terminal and connected to a
8. completion circuit Using Measured Values The c FP SG 140 reports measurements in units of mV V millivolts per volt of excitation allowing the c FP SG 140 to take measurements from a wide variety of transducers such as load cells and pressure sensors To convert measurements from mV V to the physical units of a particular transducer multiply by a constant as shown in the following sections Converting to Microstrain Strain is measured in units of microstrain u The constant you use to convert readings from mV V to ue depends on whether you are using a full half or quarter bridge strain gauge circuit If you are using a full bridge circuit similar to the one in Figure 4 you can convert readings from mV V to ue by multiplying the readings by the following constant 1 stant 1000 x constan GE where GF is the gauge factor of the strain gauges The gauge factor is listed in the strain gauge data sheet For example assume a full bridge circuit has strain gauges with a gauge factor of 2 03 Using the previous constant equation the constant is 492 6108 as shown in the following calculation 1 492 61 OS 92 6108 If the c FP SG 140 reads 0 75 mV V the strain in units of microstrain is 369 5 ue as shown in the following calculations 1000 x reading in mV V X constant reading in microstrain 0 75 x 492 6108 369 5 ue FP SG 140 and cFP SG 140 8 ni com If you are using a half bridg
9. crewdriver with a shank of at least 64 mm 2 5 in length tighten the captive screws to 1 1 N m 10 lb in of torque The nylon coating on the screws prevents them from loosening ecccccecceccccece oo 1 cFP Backplane 3 cFP SG 140 5 Screw Holes 2 cFP Controller Module 4 Captive Screws Figure 2 Installing the cFP SG 140 National Instruments Corp 3 FP SG 140 and cFP SG 140 Wiring the c FP SG 140 The following sections show how to wire strain gauges to the c FP SG 140 using the terminals on the FP TB x terminal base or cFP CB x connector block The four terminals used for strain gauges are Vexo COM Vjn and V _ Table 1 lists the terminal assignments for the signals associated with each channel Table 1 Terminal Assignments Channel Vins Vin Vexe COM 0 1 2 17 18 1 3 4 19 20 2 5 6 21 22 3 7 8 23 24 4 9 10 25 26 5 11 12 27 28 6 13 14 29 30 7 15 16 31 32 The eight input channels of the c FP SG 140 share a common ground that is isolated from the other modules of the FieldPoint system The COM terminals of all the channels and the C terminals are all connected together If you are using shielded wiring you can connect the shield to the COM terminal but only if the shield is not connected to the strain gauge circuit Connecting Sensors to the Input Channels Each channel pulses a voltage between the V and COM termi
10. e circuit similar to the one in Figure 5 you can convert readings from mV V to ue by multiplying the readings by the following constant 2 constant 1000 x GF If you are using a quarter bridge circuit similar to the one in Figure 6 you can convert readings from mV V to ue by multiplying the readings by the following constant 4 tant 1 constan 000 x GF For more information about strain gauges and how the equations in this section are derived refer to NI Application Note 078 Strain Gauge Measurement A Tutorial available at ni com Converting to Other Physical Units If you use the c FP SG 140 to measure the output of other transducers such as load cells or pressure transducers you can convert measurements from mV V to other physical units such as force or pressure Load cells are specified by maximum voltage output at maximum load capacity To convert load cell readings from the c FP SG 140 to units of force or pressure multiply the readings by the following constant constant E ScaleCapacit FullScaleOutput where FullScaleOutput is the maximum voltage output of the load cell in mV V and FullScaleCapacity is the maximum capacity of the load cell in units of force or pressure For example if you are using a load cell with a maximum capacity of 1 000 lb and a maximum output of 2 mV V the constant is 500 as shown in the following calculation 1000 _ 500 2 This means the transducer outputs 1
11. es 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 55 11 3262 3599 Canada Calgary 403 274 9391 Canada Montreal 514 288 5722 Canada Ottawa 613 233 5949 Canada Qu bec 514 694 8521 Canada Toronto 905 785 0085 China 86 21 6555 7838 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 01 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 22 3390 150 Portugal 210 311 210 Russia 095 238 7139 Singapore 65 6 226 5886 Slovenia 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 SUL LL 323346A 01 Oct02
12. nals The V and Vin terminals measure the voltage generated across the output terminals of the strain gauge bridge Each channel is filtered then sampled by an analog to digital converter Figure 3 shows the input circuit for a single channel FP SG 140 and cFP SG 140 4 ni com C Excitation Voltage c JEP SG 140 Figure 3 c FP SG 140 Input Circuit Connecting a Full Bridge Strain Gauge Connect the positive output to Vin and the negative output to Vin Connect the positive excitation terminal to V and the negative excitation terminal to COM Refer to Figure 4 Full Bridge Strain Gauge Net 8 l Input Circuitry Excitation Voltage cJFP SG 140 Figure 4 Connecting a Full Bridge Strain Gauge to One Channel Connecting a Half Bridge Strain Gauge Connect the positive output to the Vin terminal and do not connect anything to the V _ terminal Connect the positive output to Vin and the negative output to V Connect the positive excitation terminal to V and the negative excitation terminal to COM Refer to Figure 4 National Instruments Corp 5 FP SG 140 and cFP SG 140 Vexe oe Vins i Half Bridge Input C Excitation Strain Gauges Vin Circuitry Voltage COM clFP SG 140 Figure 5 Connecting a Half Bridge Strain Gauge to One Channel For any channel connected to a half b
13. ns EN 55011 Class A at 10 m FCC Part 15A above 1 GHz Electromagnetic immunity Evaluated to EN 61326 1997 A1 1998 Table 1 Sy Note For full EMC compliance you must operate this device with shielded cabling Refer to 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 For FCC regulatory statements refer to the Read Me First document that accompanies this product Mechanical Dimensions Figure 9 shows the mechanical dimensions of the FP SG 140 installed on a terminal base Dimensions are given in millimeters inches If you are using the cFP SG 140 refer to the Compact FieldPoint controller user manual for the dimensions and cabling clearance requirements of the Compact FieldPoint system Figure 9 FP SG 140 Mechanical Dimensions National Instruments Corp 15 FP SG 140 and cFP SG 140 Where to Go for Support For more information about setting up the FieldPoint system refer to these National Instruments documents e FieldPoint network module user manual e Other FieldPoint I O module operating instructions e FieldPoint terminal base operating instructions Go to ni com support for the most current manuals examples and troubleshooting information For telephone support in the United Stat
14. ridge strain gauge select Half Bridge Completion ON in the Channel Configuration dialog box in the FieldPoint software Connecting a Quarter Bridge Strain Gauge For quarter bridge sensors you need an external resistor with the same resistance as the quarter bridge strain gauge The accuracy of your measurements depends on matching the value of this completion resistor to the nominal resistance value of the strain gauge Connect the positive output of the strain gauge to V connect the positive excitation terminal of the strain gauge to V exc and connect the completion resistor between Vin and COM In the FieldPoint software select Half Bridge Completion ON Vach Quarter Bridge i Strain Gauges Vine H Input Excitation V Circuitry Voltage External o Completion i Resistor COM i l c FP SG 140 Figure 6 Connecting a Quarter Bridge Strain Gauge to One Channel FP SG 140 and cFP SG 140 6 ni com Configuring Input Channels After you connect the strain gauges configure the input channels in the FieldPoint software Selecting an Input Range To prevent inaccurate readings choose an input range such that the signal you are measuring does not exceed either end of the range Overranging allows the c FP SG 140 to measure a little beyond the nominal value of each input range For example the actual measurement limit of the 3 5 mV V range is 3 90625 mV
15. rminal on the cFP BP x backplane to the system safety ground The backplane PE ground terminal has the following symbol stamped beside it Connect the backplane PE ground terminal to the system safety ground using 14 AWG 1 6 mm wire with a ring lug Use the 5 16 in panhead screw shipped with the backplane to secure the ring lug to the backplane PE ground terminal e As with any hazardous voltage wiring make sure that all wiring and connections meet applicable electrical codes and commonsense practices Mount terminal bases and backplanes in an area position or cabinet that prevents accidental or unauthorized access to wiring that carries hazardous voltages e Operate the c FP SG 140 only at or below Pollution Degree 2 Pollution Degree 2 means that only nonconductive pollution occurs in most cases Occasionally however a temporary conductivity caused by condensation must be expected e Refer to the FieldPoint product label for regulatory certification under hazardous location standards If the FieldPoint product is not certified for operation in hazardous locations do not operate it in an explosive atmosphere or where there may be flammable gases or fumes National Instruments Corp 11 FP SG 140 and cFP SG 140 Specifications These specifications are typical for the range 40 to 70 C unless otherwise noted Input Characteristics Number of channels ADC resolution 000 8 16 bits
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