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Campbell SDM-CVO4 Instruction Manual

Other manuals for SDM-CVO4: User Manual, Features
Manual is about: 4-Channel Current/Voltage Output Module

Summary of SDM-CVO4

  • Page 1

    Sdm-cvo4 4-channel current/voltage output module revision: 7/11 c o p y r i g h t © 2 0 0 1 - 2 0 1 1 c a m p b e l l s c i e n t i f i c , i n c ..

  • Page 2: Warranty and Assistance

    Warranty and assistance products manufactured by campbell scientific, inc. Are warranted by campbell scientific, inc. (“campbell”) to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless otherwise specified on the correspo...

  • Page 3: Sdm-Cvo4 Table of Contents

    Sdm-cvo4 table of contents pdf viewers note: these page numbers refer to the printed version of this document. Use the adobe acrobat® bookmarks tab for links to specific sections. 1. Introduction..................................................................1 2. Specifications ......................

  • Page 4

    Sdm-cvo4 table of contents ii tables 4-1. Datalogger to sdm-cvo4 connections ................................................ 4 4-2. Switch position and addresses............................................................. 10 6-1. Description of sdm speed...............................................

  • Page 5: Output Module

    Sdm-cvo4 4-channel current/voltage output module the sdm-cvo4 is a synchronously addressed datalogger peripheral designed to allow the datalogger to output variable voltage or current signals under program control. Figure 1. Sdm-cvo4 (shown without mounting brackets) 1. Introduction the sdm-cvo4 exp...

  • Page 6: 2.  Specifications

    Sdm-cvo4 4-channel current/voltage output module the sdm-cvo4 is a synchronously addressed datalogger peripheral. The datalogger’s sdm ports are used to address the sdm-cvo4 and send out data that defines the desired voltage/current output of each of the four channels. The output levels are set by f...

  • Page 7

    Sdm-cvo4 4-channel current/voltage output module weight: 370 g emc status: complies with en55022-1:1998 and en50082- 1:1998 2.2 output specifications voltage mode: range: 0 – 10,000 mv resolution: 2.5 mv maximum output current: 30 ma per channel. Minimum load current: 5 μa if output accuracy (+23 °c...

  • Page 8: 3.  Power Considerations

    Sdm-cvo4 4-channel current/voltage output module maximum recommended continuous operating voltage: 240 vac rms differential between an output and datalogger ground - providing all issues relating to local regulations for safe installation and operation are followed (see section 4.5, safety issues). ...

  • Page 9

    Sdm-cvo4 4-channel current/voltage output module if the total cable length connecting sdm-cvo4s to sdm-cvo4s, other sdms and the datalogger exceeds 6 m, the sdm baud rate may need to be reduced to ensure reliable operation. Please contact campbell scientific for more information. Note the transient ...

  • Page 10

    Sdm-cvo4 4-channel current/voltage output module you cannot reliably insert more than one solid-core wire into one terminal connector unless the wires are soldered or clamped together. When inserting more than one stranded wire, twist the bare ends together before insertion. 4.2 output device connec...

  • Page 11

    Sdm-cvo4 4-channel current/voltage output module or v+ cvo4 remote current input v- + i d b) the sdm-cvo4 provides the voltage source to drive the loop. In this case the only real option is: remote current input cvo4 + – v o i d in both cases you need to consider whether the voltage supply is high e...

  • Page 12

    Sdm-cvo4 4-channel current/voltage output module sdm-cvo4. Do not connect the screen at both ends of the cable as this may result in a ground loop being formed. The output circuitry of the sdm-cvo4 includes protective components to minimize the chances of damage that can be caused by transients whic...

  • Page 13

    Sdm-cvo4 4-channel current/voltage output module jumper shown fitted in the unconnected ‘stored’ position. Select channel(s) by fitting jumper (s) between appropriate terminals. (current mode only.) jumper shown fitted to ‘enable’ channel 4. Figure 4-3. Location of jumpers on circuit board do not st...

  • Page 14

    Sdm-cvo4 4-channel current/voltage output module table 4-2. Switch position and addresses switch setting base 4 address 0 00 1 01 2 02 3 03 4 10 5 11 6 12 7 13 8 20 9 21 a 22 b 23 c 30 d 31 e 32 f 33 use a screwdriver to select address figure 4-4. Address selection switch the address switch has a he...

  • Page 15

    Sdm-cvo4 4-channel current/voltage output module where the sdm-cvo4 is going to be used in applications where the potential difference between the datalogger and the output terminals exceeds 50 v rms ac, 74 vdc then careful consideration has to be taken to ensure safe operation and compliance with l...

  • Page 16

    Sdm-cvo4 4-channel current/voltage output module is rated to withstand a 2700v, 2 second flash test, but will fail if exposed to voltages in excess of 240 v rms for long periods. B) to provide protection from transients and static for this capacitor and the opto-isolation component that bridges the ...

  • Page 17: 6.  Datalogger Programming

    Sdm-cvo4 4-channel current/voltage output module problem is where the sensor outputs are not within the common-mode voltage that the datalogger will accept (±2.5 v for the cr10x). Careful consideration should be made before using an sdm-cvo4 for such a function. Not only is it a relatively expensive...

  • Page 18

    Sdm-cvo4 4-channel current/voltage output module 6.1 crbasic sdmcvo4 instruction this instruction is used to control the sdm-cvo4 four channel current/voltage output device. Syntax sdmcvo4 ( cvo4source, cvo4reps, sdmaddress, cvo4mode ) remarks this instruction controls the sdm-cvo4, which outputs a ...

  • Page 19

    Sdm-cvo4 4-channel current/voltage output module in the device. Use of this mode takes approximately 2 milliseconds additional time per device. When either of these options is used you lose the flexibility of setting the output mode for each channel individually. Additionally, subsequent programs se...

  • Page 20

    Sdm-cvo4 4-channel current/voltage output module else wd_0_540 = wd_0_360 endif ' scale the measurements for the sdm-cvo4 to output 0-10000 mv wsout = ws_ms*200 'ws: 0-50 m/s = 0-10000 mv wdout = wd_0_540 *18.59 'wd: 0-540 deg = 0-10000mv tempout= 100*(temp_c+40) 'temp: -40-60 deg c = 0-10000 mv rho...

  • Page 21

    Sdm-cvo4 4-channel current/voltage output module location is used to scale the output to 0-10000mv for voltage mode, or 0-20 ma for current output mode. In most applications a specific range of a measured value is scaled to utilize the full scale output of sdm-cvo4. For instance, a temperature senso...

  • Page 22

    Sdm-cvo4 4-channel current/voltage output module setting the reps parameter to 0 (zero) will cause the addressed sdm-cvo4 to shut down, turning off all its outputs. It will turn on channels 1 and 2 at the next execution of instruction p103 where the reps parameter is 1 or 2. If the reps parameter is...

  • Page 23

    Sdm-cvo4 4-channel current/voltage output module ; measure the wind direction from a potentiometer windvane 2: excite-delay (se) (p4) 1: 1 reps 2: 14 1000 mv, fast range 3: 1 se channel 4: 1 excite all reps w/exchan 1 5: 1 delay (units 0.01 sec) 6: 1000 mv excitation 7: 2 loc [ winddir ] 8: 0.357 mu...

  • Page 24

    Sdm-cvo4 4-channel current/voltage output module ; as we have four channels to output, we will first copy the ; current readings with p54, block move, in a block of four ; input locations to hold the scaled outputs 9: block move (p54) 1: 4 no. Of values 2: 1 first source loc [ windspeed ] 3: 1 sourc...

  • Page 25

    Sdm-cvo4 4-channel current/voltage output module ; then apply the scaling with one instruction p53 ; the readings are scaled -3000 to +5000, i.E. To ; cover the range which would equate to ; 4-20 ma in current mode. ; windspeed to cover the range 0-100 m/s ; wind direction to cover 0-360 degrees ; t...

  • Page 26

    Sdm-cvo4 4-channel current/voltage output module ; now update the sdm-cvo4 with the information ; for the four channels 16: sdm-ao4 (p103) 1: 4 reps 2: 30 sdm address 3: 5 loc [ scldout_1 ] 6.5.3 providing isolated power supplies to sensors this program example sets all the outputs of the sdm-cvo4 t...

  • Page 27

    Sdm-cvo4 4-channel current/voltage output module ; wait 100 ms for it to power-on and the outputs to stabilize ; you may need to increase this delay if the sensors ; themselves ; have a power-on delay 3: excitation with delay (p22) 1: 1 ex channel 2: 0000 delay w/ex (units = 0.01 sec) 3: 10 delay af...

  • Page 28

    Sdm-cvo4 4-channel current/voltage output module 24.

  • Page 30

    Campbell scientific companies campbell scientific, inc. (csi) 815 west 1800 north logan, utah 84321 united states www.Campbellsci.Com • info@campbellsci.Com campbell scientific africa pty. Ltd. (csaf) po box 2450 somerset west 7129 south africa www.Csafrica.Co.Za • cleroux@csafrica.Co.Za campbell sc...