Campbell 4-Channel Current/Voltage SDM-CVO4 User Manual Download | Manualshive

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Summary of Contents for 4-Channel Current/Voltage SDM-CVO4

Page 1: ...SDM CVO4 4 Channel Current Voltage Output Module User Guide Issued 13 3 08 Copyright 2001 2007 Campbell Scientific Inc Printed under Licence by Campbell Scientific Ltd CSL 436...

Page 2: ......

Page 3: ...lieu of all other guarantees expressed or implied including those of suitability and fitness for a particular purpose Campbell Scientific is not liable for consequential damage Please inform us before...

Page 4: ......

Page 5: ...eneral Principles of Use 12 5 1 Voltage or Current Signalling 12 5 2 Providing Excitation Supplies to Sensors 12 6 Datalogger Instruction 103 13 6 1 Edlog Instruction 103 13 6 2 Edlog Program Examples...

Page 6: ...Contents Tables 4 1 Datalogger to SDM CVO4 Connections 4 4 2 Switch Position and Addresses 10 6 1 Description of Instruction 103 14 ii...

Page 7: ...ed by the application Typical applications will include driving remote current loop display units re transmitting measured values to industrial control systems which have current or high voltage input...

Page 8: ...ed with the CR800 CR1000 CR3000 and CR5000 2 Specifications 2 1 General Specifications Compatible dataloggers CR10X CR800 CR1000 CR3000 CR5000 and CR7 Also compatible with many retired dataloggers suc...

Page 9: ...m load Please contact Campbell Scientific for the accuracy specification on extended temperature tested units 2 3 Isolation Specifications Design criteria The unit has an internal isolation barrier an...

Page 10: ...cific to the installation see section 4 5 4 1 Connection to a Datalogger For datalogger connections see Table 4 1 below Table 4 1 Datalogger to SDM CVO4 Connections Connection Order SDM CVO4 Datalogge...

Page 11: ...the screwdriver to release the spring The wire will now be firmly held in place See Figures 4 1 and 4 2 below Figure 4 1 Use of the Spring Loaded Terminal Blocks Top Position Figure 4 2 Use of the Spr...

Page 12: ...ower source in current mode In voltage mode the connection to a remote device is a simple two wire connection Inputs Remote Voltage Input CVO4 Vo 4 2 2 Current Output Mode The Id terminal acts as the...

Page 13: ...ted drop of 20 mA flowing through the total resistance of the cable in the loop plus any voltage drop in the remote device normally the voltage drop across a fixed sense resistor As a simple example c...

Page 14: ...SDM CVO4 to provide a low impedance path to ground In doing this though there is a risk that you will nullify the effects of the isolation barrier e g if the ground you connect to is the same ground t...

Page 15: ...mode which may result in abnormal operation and change of output accuracy CAUTION The jumper settings can be overridden by the datalogger program if required using special commands Please contact Cam...

Page 16: ...here the potential voltage difference between the datalogger and the SDM CVO4 outputs is considered to be non hazardous less than 50 V then the unit can be used as any other peripheral without undue c...

Page 17: ...ct labels on the door It is also necessary to 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...

Page 18: ...equired inputs for Instruction 103 and also to preserve the original measurement values for other purposes Instruction 103 would then be executed at the same rate as the measurements have been made to...

Page 19: ...quence It is possible that you can power more than one sensor from each output of the SDM CVO4 either by parallel connection in voltage output mode or serial connection in current output mode Make sur...

Page 20: ...in a limit of 0 5 in terms of the scaling value stored in the input location The number of repetitions parameter 1 specifies the total number of SDM CVO4 output channels to be set The address of the f...

Page 21: ...0 mA depending on the output jumper settings Programming for the CR10X is very similar CR23X Example weather station program to show scaling values for the SDM CVO4 Table 1 Program 01 1 Execution Inte...

Page 22: ...ues and update the SDM CVO4 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 P5...

Page 23: ...structions in the example above 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 c...

Page 24: ...he SDM CVO4 into standby mode after the measurements are made An example program which show use of the SDM CVO4 as an isolated power supply for 4 sensors requiring 10 V drive and producing 0 100 mV si...

Page 25: ...eps 2 04 250 mV Slow Range 3 1 DIFF Channel 4 5 Loc Press_1 5 1 0 Mult 6 0 0 Offset Now turn o SDM CV ff the O4 by using the command with 0 reps 5 SDM AO4 P103 1 0 Reps 2 00 SDM Address 3 1 Loc Scale_...

Page 26: ...er of channels of all devices e g to set all four channels on two devices set the CVO4Reps parameter to 8 If the CVO4Reps parameter is set to 0 power to the device will be turned off SDMAddress The SD...

Page 27: ...0_540 Public Flag Public CVO4Output 4 Alias CVO4Output 1 WSOut Alias CVO4Output 2 WDOut Alias CVO4Output 3 TempOut Alias CVO4Output 4 RHOut Code for DataTable OneMin DataTable OneMin 1 1 DataInterval...

Page 28: ...V 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 RHOut RH 100 RH 0 100 RH 0 10000 mV Send mV outputs to SDM CVO4 u...

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Page 30: ...campbellsci com br suporte campbellsci com br Campbell Scientific Canada Corp CSC 11564 149th Street NW Edmonton Alberta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientifi...

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