Current Transmitter - DC Powered User Manual
Contents
1. sent out To see the internal values you must have this link installed the unit is delivered with this link NOT installed danntech PROCESS INSTRUMENTATION 2012 Typically the info displayed will be True RMS Current Transmitter DC Powered at374 Copyright Danntech 2012 Firmware V200 Input Cal Mode Use Button to capture Input Minimum Input Midpoint and Inout Maximum Ain 2955 VR1 3727 VR2 857 SW1 24 Button 0 m 1 06 c 580 20 DACOut 3737 Output Range Selection Setup using DIP Switch SW1 DIP ra a m ON o o Output Setup This is cleverly done by using either the Zero and Span trimpots or by injecting a signal into the input to vary the output and then latching the minimum and maximum values desired Can also be used to invert the output making the maximum say 4mA and the minimum 20mA Use the following steps 1 danntech PROCESS INSTRUMENTATION 2012 SW2 7 is used to activate output calibration SW2 5 amp 8 must be off The LED will flash twice every 2 seconds JUL J LI LE lf SW2 6 is off then the input is used to activate the output If SW2 6 is on then the Zero and Span trimpots are used Adjust VR2 Zero if SW2 6 is on or vary the input until you get the output desired for the minimum output value Press and hold the button until the green LED stays on then release the button to latch the output as the minimum output value J ULL J UU Le Adjust VR1 Span if SW2 6 is on2. you disable the trimpots the values that you last adjusted are saved and used until the trimpots are enabled again OFF trimpots disabled ON trimpots enabled Zero and Span Normal Wide Range Adjustment Select Provides normal and wide trimpot adjustments for Zero and Span OFF Zero and Span adjustment are normal i e approx 10 over full trimpot range ON Zero and Span adjustment are wide i e approx 50 over trimpot range Note that you may need to adjust zero and span several times to get the best accuracy Filtering Select Selects the moving average filter step response time 3 C i Filter Step Response OFF SW2 3 C SW2 4 C Time seconds No filtering step response or Orr approximately 0 2 sec Input Calibration Calibrates the input circuit to take into account any component tolerances for the input range selected Using calibrate button to indicate the required input is present at the input You must follow the sequence and carry out all three steps in order Uses three values to fit polynomial to input calibration for highest accuracy operation Inject Minimum Input Value press and hold button until green LED Stops flashing and stays on then release button Inject Midrange Input Value press and hold button until green LED Stops flashing and stays on then release button Inject Maximum Input Value press and hold button until green LED Stops flashing and stays on then r
3. Filename Current Transmitter DC Powered User Manual docx Date 31 May 2012 Version 1 01 Current Transmitter DC Powered User Manual Description This current transmitter has been designed using a dedicated precision true RMS to DC converter in combination with the most recent low cost powerful microprocessor This enables us to offer flexibility reliability and accuracy at a good price in a small package Using miniature DIP switches a variety of standard inputs and outputs can be selected and with the one button calibration accurate operation in any configuration is assured After the required input and output ranges are selected these can be adjusted to be anything within the range using the one button calibration Output inversion is also easily accommodated Q p s z 5 The Zero and Span trimpots can be disabled or switched to a wider adjustment range using the DIP switches Filtering is also DIP switch selectable in four ranges up to 60 seconds Included in the design is a full wave rectifier and zero crossing detector These provide for current measurement on a per cycle basis for high speed applications and also accurate frequency measurement Firmware changes can be done if you have a special application that we have not catered for How it Works A description of how it works will be included here functional diagram to be inserted here GN wil ire i i Kij Dir d WIF a VN EE
4. LEEEEHETTTTET 2345678 L232 454 78 Figure 1 DIP Switches for Range Selection and Options Accessible beneath side cover decal danntech PROCESS INSTRUMENTATION 2012 1 Input Range Selection Set with DIP Switch SW1 0 5A 0R025 closed open open open closed Input Setup This is cleverly done with the following steps injecting minimum midrange and maximum values This to allow polynomial linearization to improve the overall device accuracy 1 SW2 5 is used to activate input calibration SW2 6 7 amp 8 must all be off LED will flash twice every 2 seconds dU JTUL 2 Inject the minimum input you require 3 Press and hold the button until the green LED stays on then release the button to latch the input value as the minimum input calibration LI Lo LI LI 4 Now inject the midrange value 50 value 5 Press and hold the button until the green LED stays on then release the button to latch the input as the midrange value JU UU oop 6 Inject the maximum value 7 Press and hold the button until the green LED stays on then release the button to latch the input as the maximum value JL LE 8 Switch SW2 5 off to complete the process While doing the input calibration information can be observed using the RS232 jack socket connection This works at 9600 8 N 1 no flow control Without the link installed between CN2 programming header pins 1 amp 2 only the header line will be
5. d danntech cc Co No 6510211 Reg No CK1986 15338 23 15 College Close Hamble le Rice Tel International 27 11 7921239 Southampton Hampshire Tel National 011 7921239 SO31 4QU Fax International 27 11 7924687 United Kingdom Fax National 011 7924687 Tel 075 9069 1824 Z am E Lu ce Vv Vv Vv uJ U O a a sn Y Oo aie a G e mail sales danntech com P O Box 1023 Fontainebleau 2032 www uk danntech info Republic of South Africa www danntech com e mail sales danntech info cc Danntech makes no warranty of any kind with regard to this material including but not limited to the implied warranties of merchantability and fitness for a particular purpose Danntech shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing performance or use of this material This document contains proprietary information which is protected by copyright No part of this document may be photocopied reproduced or translated into another language without the prior written consent of Danntech The information in this document is subject to change without notice danntech PROCESS INSTRUMENTATION 2012 9
6. elease button danntech PROCESS INSTRUMENTATION 2012 6 Output Calibration Activation Source Select 6 F OFF Input is selected as the output activation source OFF ON Zero and Span trimpots selected as the output activation source for minimum and maximum output values Output Calibration Calibrates the output circuit to take into account any component tolerances for the input range selected and the output range required Uses the calibrate button to indicate the required output is present at the output You must follow the sequence and carry out both steps in order The output can be set using the input SW2 6 F OFF or the values are set using the Zero and Span trimpots 7G SW2 6 F ON select output activation source Ain or trimpots Set input or Zero trimpot for the minimum output required press and hold button until green LED stops flashing and stays on then release button Set input or Span trimpot for the maximum output required press and hold button until green LED stops flashing and stays on then release button Test Built in test function which is activated by switching on SW2 8 H with switches SW2 5 E SW2 6 F amp SW2 7 G off In Test mode the output can be switched in sequence from 1 following the input to 2 minimum possible output value to avalue for approximately 4mA output if the output is set for current otherwise approximately 2 volts then 12 mA 50 output then 20
7. he button is pressed The LED will flash once every 2 seconds and the output will be as per normal determined by the input without the Zero and Span adjustments JL LE First press output zero J LL LI second press output calibrated minimum d OUL T OUL Third press output calibrated maximum calibrated minimum 2 calibrated minimum Fourth press output calibrated maximum danntech PROCESS INSTRUMENTATION 2012 Fifth press output maximum Sixth press output normal and follows input without Zero and Span adjustments JL LE While doing the input calibration information can be observed using the RS232 jack socket connection This works at 9600 8 N 1 no flow control Without the link installed between CN2 programming header pins 1 amp 2 only the header line will be sent out To see the internal values you must have this link installed Typically the info displayed will be True RMS Current Transmitter DC Powered at374 Firmware V2 00 Copyright Danntech 2012 Use Button to Cycle through outputs gt 0 min max min 2 max 4095 Ain 536 VR1 3727 VR2 858 SW1 136 Button 0 m 1 07 c 285 11 DACOut 859 Tm 1 00 Tc 0 00 Runtime 122 danntech PROCESS INSTRUMENTATION 2012 5 DIP SW2 Operational Settings Zero and Span Trimpot Enable Enables the operation of the Zero and Span trimpots on the front panel You can enable the trimpots make your adjustments and then when
8. mA 100 output and then 22mA maximum output value then back to following the input step 1 8 H Using the calibrate button you can cycle through these outputs The cycle is repeated as the button is pressed Power Up On power up the following is sent to the RS2382 port irrespective of the CN2 link True RMS Current Transmitter DC Powered dt374 Copyright Danntech 2012 Firmware V200 Normal power up lf the device has restarted due to a watchdog reset then instead of Normal power up The following will be displayed instead True RMS Current Transmitter DC Powered dt374 Copyright Danntech 2012 Firmware V200 Restarted processor because of watchdog timeout danntech PROCESS INSTRUMENTATION 2012 7 Specifications 1 10 11 12 13 14 15 16 17 Standard inputs 0 1A 0 5A others possible Can also be used with clamp on current transformer for AC current measurements 0 up to 75 A Standard outputs DIP switch selectable 4 20 mA 0 20 mA 0 5 V 0 10 V 10 V True RMS conversion from DC up to 10 kHz Isolation 1000 V AC RMS three way isolation between input output and auxiliary power supply Response time approximately 200 mS with filter off Optional filtering selection with DIP switches 0 1 1 10 and 60 seconds step responses to eliminate noise if required High speed option available per cycle response Internal trimpot adjustment of output minimum and ma
9. or vary the input until you get the output desired for the maximum output value Press and hold the button until the green LED stays on then release the button to latch the output as the maximum output value JL 7 Switch SW2 7 and 6 off to complete the process While doing the input calibration information can be observed using the RS232 jack socket connection This works at 9600 8 N 1 no flow control Without the link installed between CN2 programming header pins 1 amp 2 only the header line will be sent out To see the internal values you must have this link installed Typically the info displayed will be would be nice to have activation source indicated i e state of SW 2 6 True RMS Current Transmitter DC Powered dt374 Copyright Danntech 2012 Firmware V200 Output Cal Mode Use Button to capture Output Min and Max lt SW2 6 OFF Ain ON POTs top zero bot span gt Ain 535 VR1 3727 VR2 857 SW1 104 Button 0 m 1 07 c 285 11 DACOut 857 Test There is a test function built in which is activated by switching on SW2 8 with switches SW2 5 SW2 6 amp SW2 7 off In Test mode the output can be switched from following the input to minimum output value to a value for approximately 4mA output if the output is set for current otherwise approximately 2 volts then 12 mA 50 output then 20mA 100 output and then 22mA maximum output value Using the button you can cycle through these outputs The cycle is repeated as t
10. ximum which can be locked using DIP switch Power On LED indication Microprocessor based latest architecture Smart input and output calibration re ranging using push button switch and LED Linearity better than 0 2 of full scale Auxiliary supplies 12 VDC and 24 VDC 10 Auxiliary supply current 12 VDC at 80mA lout 24 VDC at 45mA lout Operating temperature 10 C to 70 C DIN rail mounting with flame proof high quality enclosure Screw terminal connections for wire diameter 2 5 mm Dimensions 25 x 80 x 85 mm W x H x D danntech PROCESS INSTRUMENTATION 2012 Part Numbering see the document Current Transmitters Part Numbering for more details OUTPUT I CURRENT V VOLTAGE piaia i Customized inputs ee and outputs available on request Mains amp DC Powered CURRENT A 4 20 mA _ OUTPUT B 0 20mA Relay Alarms Optional etc 40mm Wide INPUT i A 0 10V O z ch lt DC Powered 1 25mm Wide SELECTION mm wy lly aby apy a li dna A lt lt A 0 1 AAC POWER at SUPPLY B 0 5AAC OUTPUT CURRENT C 0 10 AAC SSC INPUT 5 0 20 mAAC i TRUE RMS for clamp on sensor 0 75A T 0 4mAAC D aa E E nerna 22 relay outputs True RMS Current Transmitter CONFIGURATION test acon 5 0 5 A in 4 20 mA out left out if not required g 24 VDC auxiliary power i alarm relay outputs danntech lt
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