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Campbell SDM-CVO4 Product Manual

4-channel current and voltage output module
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SDM-CVO4
4-Channel Current and
Voltage Output Module
Revision: 06/2020
Copyright © 2001 – 2020
i
Campbell Scientific
CSL I.D - 436

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Summary of Contents for Campbell SDM-CVO4

  • Page 1 SDM-CVO4 4-Channel Current and Voltage Output Module Revision: 06/2020 Copyright © 2001 – 2020 Campbell Scientific CSL I.D - 436...
  • Page 3 Quotations for repairs can be given on request. It is the policy of Campbell Scientific to protect the health of its employees and provide a safe working environment, in support of this policy a “Declaration of Hazardous Material and Decontamination”...
  • Page 5 PLEASE READ FIRST About this manual Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the North American market. Some spellings, weights and measures may reflect this origin. Some useful conversion factors: Area: 1 in...
  • Page 7 • Periodically (at least yearly) check electrical ground connections. WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS...

  • Page 9: Table Of Contents

    Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. Introduction..............1 2. Precautions ..............1 3. Initial Inspection ............2 4. Quickstart ..............3 5.
  • Page 10 7-4. Location of Jumpers on Circuit Board ..........13 7-5. Address Selection Switch ..............14 Tables 7-1. Data Logger to SDM-CVO4 Connections ...........9 7-2. Switch Position and Addresses ............14 9-1. Description of SDM Speed ..............17 CRBasic Example B-1.

  • Page 11: Introduction

    SDM-CVO4 4-Channel Current/Voltage Output Module Introduction The SDM-CVO4 is attached to a data logger and outputs variable voltage or current signals under data logger program control. Typical applications include driving remote current-loop display units, retransmitting measured values to industrial control systems, sending control signals to valve controllers, and providing excitation voltages or currents to external sensors.

  • Page 12: Initial Inspection

    Ensure that metal parts on the outside of the enclosure that might come in contact with active high voltage circuits are connected to a safety ground. The ground lug on Campbell Scientific enclosures is not an issue because it normally is the point of contact to a good ground point.

  • Page 13: Quickstart

    Wiring tab. Refer to the sensor manuals for more information. In the Available Sensors and Devices box, type SDM-CVO4 or locate the device in the Calculations > Control folder. Double-click Device for Current/Voltage Input from SDM-CVO4.
  • Page 14 SDM-CVO4 4-Channel Current/Voltage Output Module Click the Wiring tab to see how the device is to be wired to the data logger. Click OK after wiring the device. In Output Setup, type the scan rate, meaningful table names, and Data...

  • Page 15: Overview

    20 mA current source using a voltage output derived from its power supply. The SDM-CVO4 is a synchronously addressed data logger peripheral. The data logger SDM terminals are used to address the SDM-CVO4 and send data that defines the desired voltage/current output of the four channels. The output levels are set by four values stored in variables in the data logger.

  • Page 16: Power Considerations

    Alkaline batteries are not recommended for long term applications. The SDM-CVO4 has two internal power supplies, one for channels 1 and 2 and one for channels 3 and 4. It only turns on the power supply for channels 3 and 4 if sent an instruction that sets the output of those channels.

  • Page 17: Specifications

    SDM-CVO4 4-Channel Current/Voltage Output Module Specifications Operating voltage: 12 VDC nominal (8 V to 16 V) Current drain at 12 VDC: Typical active quiescent current 27 or 54 mA, depending on operating mode (no load on output ports). To estimate the total current, add the quiescent current to the sum of all output currents multiplied by 1.5.

  • Page 18: Isolation

    1500 VAC (RMS), 2500 VDC nominal. The isolation is between any output and the SDM-CVO4 ground connection and between individual output channels. Protection components are built-in, which will break down at voltages close to this limit (see Section 2, Precautions (p.

  • Page 19: Connection To A Data Logger

    Please contact Campbell Scientific for more information. The transient protection of the SDM-CVO4 relies on a low resistance path to earth. Ensure that the ground return wire has a low resistance. Connect the SDM-CVO4 directly to the enclosure earth ground terminal.

  • Page 20: Output Device Connections

    SDM-CVO4 4-Channel Current/Voltage Output Module FIGURE 7-1. Use of the Spring-Loaded Terminal Blocks (Top Position) FIGURE 7-2. Use of the Spring-Loaded Terminal Blocks (Front Position) Only insert one solid-core wire into one terminal unless the wires are soldered or clamped together. When inserting more than one stranded wire, twist the bare ends together before insertion.

  • Page 21: Voltage Output Mode

    Several connections are possible in the current mode. Connection to remote current inputs depends on whether a remote voltage source powers the loop current or the SDM-CVO4 powers the loop current. The connections for using a remote voltage source to power the loop current depends on the ground referencing requirements of the remote voltage source;...

  • Page 22: Shield And Ground Connections

    250-ohm sense resistor will drop 5 V at 20 mA (using Ohm’s law), and the SDM-CVO4 will drop 2.5 V in the loop. Therefore, the maximum allowable voltage drop in the cable of the loop is: 13.5 – 5.0 – 2.5 = 6.0 V.

  • Page 23: Output Terminal Connectors

    Output Mode Setting An internal jumper sets the output mode for each SDM-CVO4 channel. Voltage and current output modes are available. Open the case to change the mode settings. To do this, first disconnect the device from any source or power, unplug the connectors to disconnect the output connections, then remove the four larger screws from the face of the case.

  • Page 24: Sdm Address Setting

    4 addresses. Operation Voltage or Current Signaling The SDM-CVO4 can retransmit sensor measurements to remote displays or measurement systems. In these applications, the data logger program measures the sensors using the same programming as given in the sensor manuals.

  • Page 25: Providing Excitation Supplies To Sensors

    One application for this device is to provide excitation to a sensor or sensors. Use the SDM-CVO4 to excite the sensor when a sensor requires a precise voltage or current excitation that cannot be provided by the data logger, or when exciting the sensor from the data logger or its power supply will cause a common-mode measurement error.

  • Page 26: Data Logger Programming

    (p. 14) 8.3.1 CRBasic SDMCVO4() Instruction This instruction controls the SDM-CVO4, which outputs a voltage or a current. Internal jumpers are used to set the mode for the device, but the jumpers can be overridden with the Mode parameter in this instruction.

  • Page 27: Sdmspeed() Instruction

    Current output; override jumper setting The two override options (10 and 11) affect all of the channels of all of the SDM-CVO4 devices being controlled by this instruction. These two options override the hardware settings in the device. Use of this mode takes approximately 2 milliseconds additional time per device.

  • Page 29: Importing Short Cut Code Into Crbasic Editor

    Appendix A. Importing Short Cut Code Into CRBasic Editor Short Cut creates a .DEF file that contains wiring information and a program file that can be imported into the CRBasic Editor. By default, these files reside in the C:\campbellsci\SCWin folder. Import Short Cut program file and wiring information into CRBasic Editor: Create the Short Cut program.

  • Page 31: Example Program

    'WD: 0-540 deg = 0-10000mV TempOut= 100*(Temp_C+40) 'Temp: -40-60 deg C = 0-10000 mV RHOut = RH *100 'RH: 0-100 % RH = 0-10000 mV 'Send mV outputs to SDM-CVO4 using the option to override the switch settings SDMCVO4 (CVO4Output(),4,0,10) NextScan EndProg...
  • Page 32 Campbell Scientific regional offices Australia France Thailand Location: Garbutt, QLD Australia Location: Vincennes, France Location: Bangkok, Thailand Phone: 61.7.4401.7700 Phone: 0033.0.1.56.45.15.20 Phone: 66.2.719.3399 Email: info@campbellsci.com.au Email: info@campbellsci.fr Email: info@campbellsci.asia Website: www.campbellsci.com.au Website: www.campbellsci.fr Website: www.campbellsci.asia Brazil Germany Location: São Paulo, SP Brazil...

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