Model ACC18B Signal Converter
Contents
1. FREQ RC FREQUENCY COUNTER 5 7 DIGITAL A MILLIAMPMETER DIGITAL VOLT METER Adjust SPAN control fully counter clockwise or 20 turns Inject the test frequency equal to Fmax while adjusting SPAN for current equal to the desired Full Scale current output 1 e 20 mA or 50 mA Adjust ZERO control for desired zero current 1 20 mA or 50 mA See test setup shown in Figure 4 2 Iterate SPAN and ZERO adjustment for the desired current output until no change is observed 14 of 19 HP 209 5 MAINTENANCE 5 1 INTRODUCTION Hoffer Flow Controls flow measurement systems are constructed to give a long service life in the targeted measuring field and service environment However problems do occur from time to time and the following points should be considered for preventative maintenance and repairs The bearing type used in the flowmeter was chosen to give compromise between long life chemical resistance ease of maintenance and performance A preventative maintenance schedule should be established to determine the amount of wear which has occurred since last overhaul See user s manual for flowmeter for further instructions A spare parts list has been provided which at the discretion of the user may be user stocked Consult with the manufacturer if an abridged spare parts list is sought The recom2. 4 of 19 HP 209 Figure 1 3 Explosion Proof Case Style 3H O and 3B O NFT N Hi ai hs 5 1 57 SS rj MPT 1 ALL DIMENSIONS ABE IN INCHES Figure 1 4 NEMA 4 Case Style 5 ALL DIMENSIONS ARE IN INCHES ACC 18B 5 of 19 HP 209 16 SHIPPING AND HANDLING CAUTION The ACC18B is a static sensitive device and standard practice for static sensitive parts should be observed In the event of malfunctioning equipment the following guidelines should be observed for the preparation and shipment of the equipment Failure to do so may result in the material reaching its destination damaged The electronic unit due to its STATIC SENSITIVE nature should be wrapped in a material conforming to MIL B 81705 Type II and packaged in a heat sealable bag conforming to MIL P 81997 These steps are necessary to protect the equipment from electrostatic charge s that may occur during handling The package should then be marked with a sensitive electronic device caution label conforming to MIL STD 129 appendix C The equipment should then be wrapped in cushioning material and placed into a close fitting box conforming to PPP B 636 Domestic class The exterior shipping container should be marked with a sensitive electronic device caution label conforming to MIL STD 129 appendix C Clearly mark the factory prov
3. II 3280107 57 1913053 350949 d3HLO 83 SMOTOS SY OTH ANY 904 0350 do 2307004934 5970 OL 38 THS 40 01507050 38 01 LON 24H OMI 5109III0 WHL d3HIO 5391743101 S3H0I 014 93140 40 11434044 XIIIIMXIMII02 5II05I9II0 032305 SSN LIO HI38vZIl3 O14 TUT 0201 UA i RA 1 I I LAL 1 1 1 Ver RE tte anes i Ida 1S f aOd 2 X iz 9 1H I I 3 TEMS 1 iod BON ge qe ve i Pree Y m 20 wasn I k Gu TT3IHS 3PAGE G i i i 1 1 3 lt 3 ar g dd 3NOZ HP 209 18 of 19 ACC 18B REVISIONS REV DESCRIPTION MMI DW C DWG NO WAS 700 0130 000621 PER ECP 594 ADDED 6TH POSITION 2 FoR TERMINAL BLOCK ose as PCA 56 62 56 202 62 201 WHT GRN SIGNAL COMMON FLOWMETER SIGNAL WHT RED DC INPUT CURRENT OUTPUT BLK HT REPLACES 700 0130 w w Rh HOFFER FLOW CONTROLS INC 1 3 10 92 WIRING INTERNAL CASE ACC18B SIZE CODE DWG NO Scc 10 ACC 18B 19 of 19 HP 209
4. nominal e Trigger Sensitivity 10 millivolt RMS minimum 10 Hz to 1000 Hz Over voltage 120 volts RMS absolute max CURRENT OUTPUT Accuracy 05 of full scale e Temperature drift 200 PPM C Available range 4 20 Ma and 10 50 e Response time 0 5 seconds for 10 to 90 e Load Resistance Dependent on excitation voltage See Figure 1 R Vext 8 LOAD EXT Ty s Where Vexr Excitation Voltage Ips Full Scale Current Output ripple less than 0 2 of F S 1 of 19 HP 209 ACC 18B INPUT POWER e 8 35 VDC unregulated ENVIRONMENTAL Operating 0 70 C Storage 20 70 C ENCLOSURES General purpose standard Case NEMA 4 Explosion Proof Figure 1 1 Load Resistance TOTAL LOAD RESISTANCE REN EZE 0 20 30 40 v DC POWER SUPPLY 2 of 19 HP 209 13 ORDERING INFORMATION MODEL ACC18B ANALOG OUTPUT ENCLOSURE STYLE ANALOG OUTPUT MODEL ACC18B OPTION 1 4 20 UN ISOLATED 2 10 50 UN ISOLATED IT 4 20 ISOLATED ENCLOSURE STYLE MODEL 8 B OPTION 1 STYLE 1 GENERAL 3H O STYLE 3 CASE EXPLOSION PROOF WITH WATER TIGHT MEETS CLASS I GROUP D KILARK GECCT 3 STOCK 200 0400 200 0398 CLASS II GROUPS F amp G CLASS III 3B O STYLE 3 CASE GROUP B WITH WATER TIGHT O RING GROUP B ADALET HKB HK2D STOCK 200 04
5. flowmeter signal is then passed through a signal conditioning chain where it is filtered amplified and shaped into a train of digital pulses whose frequency is related to the volume flow rate and where each pulse represents a discrete volume of fluid The signal entering the frequency to voltage converter is passed through a combination of a divide by N and a DIP switch matrix The divide by N output is chosen whose pulse rate is between 75 and 150 Hz at the maximum flow rate measured This scaled pulse rate is then filtered into an analog voltage This voltage is proportional to volumetric flow rate The resulting output voltage related to flow is then fed into the output amplifier The output amplifier is a voltage to current amplifier and offers ZERO and SPAN adjustments and is available in standard process ranges of either 4 20mA or 10 50mA 9 of 19 HP 209 Figure 3 1 Block Diagram ACC 18B 10 of 19 HP 209 4 CALIBRATION PROCEDURE 41 INTRODUCTION In general all flow measurement systems supplied by Hoffer Flow Controls have been factory calibrated as specified by the user at the time of purchase free of charge All systems which underwent such a factory calibration have a calibration setup sheet included with the shipment This sheet contains the details of analog outputs as well as other useful calibration data Field calibration is only required when a change has occurred or is sought to the measuring system
6. 06 200 0405 NOTE INSERT X IN MODEL NUMBER FOR EVERY OPTION NOT SPECIFIED ACC 18B 3 of 19 HP 209 1 4 WARRANTY 1 5 Hoffer Flow Controls warrants that all equipment will be free from defects in workmanship and material provided that such equipment was properly selected for the service intended properly installed and not misused Equipment which is returned transportation prepaid to Hoffer Flow Controls within 12 months after delivery of goods or 18 months from date of shipment on equipment for destination outside the United States and is found by Hoffer Flow Controls inspection to be defective in workmanship or material will be repaired or replaced at Hoffer Flow Controls sole option free of charge and returned shipped using the lowest cost transportation prepaid In the event of product failure contact Hoffer Flow Controls at 919 331 1997 or 800 628 4584 for issuance of a Returned Material Authorization RMA number ENCLOSURE DETAIL ACC 18B The 18 is may be packaged in either the General Purpose case Style 1 in an Explosion Proof case Style 3H O or in the NEMA 4 case Style 5 Dimensions are given in Figures 1 2 1 3 and 1 4 Figure 1 2 General Purpose Case Style 1 ALL DIMENSIONS ARE IN INCHES IL HOFFER ELO I 5 CONTROLS IN EUZABETH
7. LLATERAL TO OR AFFECTING THE AGREEMENT PURCHASER S SOLE AND EXCLUSIVE REMEDY IS THE REPAIR AND OR REPLACEMENT OF NONCONFORMING GOODS AS PROVIDED IN THE PRECEDING PARAGRAPHS HFC SHALL NOT BE LIABLE FOR ANY OTHER DAMAGES WHATSOEVER INCLUDING INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES HFC 9708 Table of Contents Prelace e makacha fu i 1 Introduction aae eee eee e Sefa 1 1 1 1 1 2 Performance Characteritstics 1 1 3 Ordering Information eese 3 1 4 4 1 5 Enclosure Detall 4 1 6 Shipping and 6 R au ut hh n dei 7 2 1 Installation Wiring Layout for Interconnections 7 2 2 Installation of the ACC18B y 3 Functional Description ener ene ptr eaten 9 3 1 Introduction 9 3 2 Principle of Operation 9 4 Calibration Proced reuz un E 11 4 1 Introduction na 11 4 2 Required Test Equipment 11 4 3 Controls and Adjustments sese 12 4 4 Procedure e E au ha BAR EEE 13 5 Malntenance a 15 5 1 ___ 15 5 2 Trouble Shooting and Ma
8. M expected by the application term this GPM MAX GPM MAX may be calculated based on the analog output scale requirements or may be the maximum flow rate listed on the flowmeter s calibration sheet From the calibration constant or K Factor listed on the data sheet for the flowmeter obtain the frequency corresponding to GPM MAX using Equation 1 and designate this frequency F MAX Equation 1 yx X MAX 60 Where Fax is the maximum input frequency Kavez is the average calibration factor The analog output of the ACC18B may be calibrated with the aid of an external oscillator used in conjunction with a frequency counter The external oscillator is used to supply a test frequency In this method the external oscillator is connected to the signal input terminals as shown in Figure 4 2 The oscillator s output frequency is set to equal F MAX as indicated on the frequency counter The course range adjustment is accomplished by selecting a switch position on a DIP switch located on the PCA 62 printed circuit card See Table 4 1 to determine required switch position and set into switch as shown in Figure 4 1 for anticipated Fmax ACC 18B 13 of 19 HP 209 ACC 18B Table 4 1 Range Select INPUT FREQUENCY FMAX 75 TO 150 Hz 150 TO 300 Hz 300 TO 600 Hz 600 TO 1200 Hz 1200 TO 2400 Hz Connect a digital milliampmeter or digital voltmeter as shown in Figure 4 2 Figure 4 2 Test Setup
9. Model ACCISB Signal Conditioner Two Wire Frequency to Analog Current Transmitter USER S MANUAL October 2012 PERFECTING MEASUREMENT H HOFFER FLOW CONTROLS INC 107 Kitty Hawk Lane P O Box 2145 Elizabeth City NC 27906 2145 800 628 4584 252 331 1997 FAX 252 331 2886 www hofferflow com E mail info hofferflow com NOTICE HOFFER FLOW CONTROLS INC 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 This manual has been proyided as an aid in installing calibrating operating and servicing this unit Every precaution for accuracy has been taken in the preparation of this manual however HOFFER FLOW CONTROLS INC neither assumes responsibility for any omissions or errors that may appear nor assumes liability for any damages that may result from the use of the products in accordance with information contained in the manual HOFFER FLOW CONTROLS policy is to provide a user manual for each item supplied Therefore all applicable user manuals should be examined before attempting to install or otherwise connect a number of related subsystems During installation care must be taken to select the correct interconnecting wiring drawing The choice of an incorrect connection drawing may result in damage to the system and or one of the components Please review the complete model number of ea
10. Such a change may be due to repair replacement or recalibration of the flowmeter or perhaps a change in the analog output span 42 REQUIRED TEST EQUIPMENT In order to calibrate and troubleshoot the 18 the following suggested equipment list is provided PART MANUFACTURER NUMBER DESCRIPTION Fluke 8060A True RMS Multimeter Simpson 420 Function Generator Viz WD 755 Multi Function Counter Spectrol 8 T000 Adjustment Tool ACC 18B 11 of 19 HP 209 43 CONTROLS AND ADJUSTMENTS SENSITIVITY RANGE SPAN ZERO A twenty turn control used to set the threshold sensitivity level above the ambient noise pickup A dual in line DIP switch located within the enclosure which is used to program the module to accept an input frequency range A multiple turn adjustment which is used to set the current output signal to the desired span corresponding to the equivalent flow range 1 4 to 20 mA corresponding to 0 100 GPM A multiple turn adjustment which is used to set output signal with no flow to the desired zero value i e 4 mA IT IS NECESSARY TO OPEN THE COVER OF THE ENCLOSURE BY REMOVING TWO SCREWS ON SIDE OF BOX AND LIFTING COVER TWO PRINTED CIRCUIT CARDS ARE ATTACHED THE RANGE DIP SWITCH MAY BE PROGRAMMED WITH A PEN Figure 4 1 Control and Adjustment Detail ACC 18B 12 of 19 HP 209 44 PROCEDURE Begin by determining the equivalent maximum volumetric flow rate in GP
11. Y TURN WITH NO FLOW SENS POT CCW UNTIL FALSE INDICATION STOPS NOTE THAT IN FULL CCW POSITION THE UNIT WILL NOT FUNCTION REPLACE FLOWMETER PICKUP COIL DEFECTIVE UNIT REPAIR OR REPLACE INCORRECT ZERO VERIFY THAT POWER SUPPLY READING WITH NO VOLTAGE IS SUFFICIENT FOR THE FLOW REQUIRED LOAD RESISTANCE UNIT IS OUT OF CALIBRATION RECALIBRATE DEFECTIVE UNIT REPAIR OR REPLACE CURRENT OUTPUT FLOWMETER BEING USED BEYOND EXCEEDS DESIRED CALIBRATED SPAN OF THE UNIT SPAN CALIBRATION INCORRECT RECALIBRATE DEFECTIVE UNIT REPAIR OR REPLACE NO OUTPUT CURRENT POWER SUPPLY POLARITY REVERSED VERIFY INSTALLATION WIRING SHORT ON FLOWMETER PICKUP COIL OR SHIELD REPLACE COIL AND CHECK WIRING DEFECTIVE UNIT REPAIR OR REPLACE ACC 18B 16 of 19 HP 209 53 REPLACEMENT PARTS PART NUMBER DESCRIPTION ACC18B 1 1 4 TO 20 mA OUTPUT ASSEMBLY ACC18B 2 1 10 TO 50 mA OUTPUT ASSEMBLY ACC 18B 17 of 19 HP 209 I 110031 403 3504904 83410 dO 3040 40 HOLIdHOO MO gt WON Jon NG 38 151 34H AE 5 NO d35h WDO 39714
12. ackage and on any correspondence FOR WARRANTY RETURNS please FOR NON WARRANTY REPAIRS OR have the following information available CALIBRATIONS consult HOFFER FLOW BEFORE contacting HOFFER FLOW CONTROLS for current repair calibration CONTROLS charges Have the following information 1 P O number under which the product available BEFORE contacting HOFFER FLOW was PURCHASED CONTROLS 2 Model and serial number of the 1 P O number to cover the COST of the product under warranty and repair calibration 3 Repair instructions and or specific 2 Model and serial number of the product and problems relative to the product 3 Repair instructions and or specific problems relative to the product HFC 9708 LIMITED WARRANTY HOFFER FLOW CONTROLS INC HFC warrants HFC s products goods described in the specifications incorporated in this manual to be free from defects in material and workmanship under normal use and service but only if such goods have been properly selected for the service intended properly installed and properly operated and maintained This warranty shall extend for a period of one 1 year from the date of delivery to the original purchaser or eighteen 18 months if the delivery to the original purchaser occurred outside the continental United States This warranty is extended only to the original purchaser Purchaser Purchaser s sole and exclusive remedy is the repair and or replacement of nonconfor
13. ch item to be connected and locate the appropriate manual s and or drawing s Identify all model numbers exactly before making any connections A number of options nd accessories may be added to the main instrument which are not shown on the basic user wiring Consult the appropriate option or accessory user manual before connecting it to the system In many cases a system wiring drawing is available and may be requested from HOFFER FLOW CONTROLS This document contains proprietary information which is protected by copyright All rights are rese VE Ko art of this document may be photocopied reproduced or translated to another language without the prior written consent of HOFFER FLOW CONTROLS INC HOFFER FLOW CONTROLS policy is to make running changes not model changes whenever an improvement is possible This affords our customers the latest in technology and engineering The information contained in this document is subject to change without notice RETURN REQUESTS INQUIRIES Direct all warranty and repair requests inquiries to the Hoffer Flow Controls Customer Service Department telephone number 252 331 1997 or 1 800 628 4584 BEFORE RETURNING ANY PRODUCT S TO HOFFER FLOW CONTROLS PURCHASER MUST OBTAIN A RETURNED MATERIAL AUTHORIZATION RMA NUMBER FROM HOFFER FLOW CONTROLS CUSTOMER SERVICE DEPARTMENT IN ORDER TO AVOID PROCESSING DELAYS The assigned RMA number should then be marked on the outside of the return p
14. ided RMA number on all paperwork and shipping packaging ACC 18B 6 of 19 HP 209 2 INSTALLATION 2 1 INSTALLATION WIRING LAYOUT FOR INTERCONNECTIONS In considering the interconnections between the flowmeter and the flow measurement system some attention must be given to anticipated noise sources and to the coupling of these noise sources to the interconnecting wiring Noise signals may be coupled inductively or capacitively into the wiring between the sensor and the electronic measuring systems In general utilizing a shielded twisted pair for the interconnection greatly reduces this coupling The shield should be grounded on one end of the cable only In general grounding only on the electronic measuring system is best However even with proper interconnecting cabling cross talk with other signal lines or power lines may still occur and should be avoided Physical isolation of the wiring reduces the chance of potential problems INSTALLATION OF THE 18 ACC 18B The model ACC18B should be placed in a convenient location which maintains access to the unit should repairs or readjustment be required Refer to wiring installation Figure 2 1 for appropriate terminals for interconnections Connections to the terminal block should be carefully dressed to avoid having bare wires extending past the screw clamp on the terminal block This is particularly important for units mounted within the explosion proof enclos
15. intenance 15 5 3 Replacement 17 ACC 18B HP 209 This page intentionally left blank ACC 18B HP 209 PREFACE ACC 18B This manual provides all the necessary information to correctly install operate maintain and troubleshoot the Model ACC 18B two wire current transmitter The ACC 18B is intended to provide the user with a suitable interface between a frequency generating device and a data acquisition system This manual is organized to provide ease of use Individual sections are provided to cover the Introduction Installation Functional Description Calibration Maintenance and Troubleshooting Illustrations have been used to improve the clarity of information provided in this manual i HP 209 This page intentionally left blank ACC 18B ii HP 209 1 INTRODUCTION 1 1 INTRODUCTION The Model ACC18B is a two wire frequency to current transmitter that allows convenient interfacing to the turbine flowmeter which provides an analog current output proportional to flow rate The input signal conditioning circuitry is designed to accept the low level turbine flowmeter signal while providing rejection of unwanted noise and spurious signals The output signal is a DC current which is proportional to flow rate PERFORMANCE CHARACTERISTICS ACC 18B INPUT e Input protected RF and band pass filtered adjustable trigger level Input Impedance 40 kilo ohm
16. mended spare list may be found following this section and in the user s manual for the flowmeter In case the flow measurement system malfunctions or becomes inoperative a trouble shooting procedure follows Factory consultation is available to assist in diagnosing problems In addition factory repair parts and service are available for individuals who wish to utilize this service TROUBLE SHOOTING AND MAINTENANCE ACC 18B ALL PRINTED CIRCUIT CARDS ARE WARRANTED FOR ONE YEAR AFTER DATE OF SALE ALL PRINTED CIRCUIT CARDS MAY BEFACTORY REPAIRED AT A NOMINAL FEE FOR PARTS AND LABOR AFTER WARRANTY PERIOD In case of an inoperable or malfunctioning system the following procedures can be used to isolate the faulty wiring printed circuit boards and or alternate causes The majority of repairs can be made in the field thereby reducing the time a unit is out of service 15 of 19 HP 209 The necessary documentation is contained within this manual with the exception of the calibration data sheet for the turbine flowmeter This calibration is supplied separately Factory consultation is available to assist in diagnosing problems Please note that in some cases factory repairs can be performed more easily than can be accomplished in the field Failure conditions are listed and the possible corrective actions given to eliminate the observed problem OBSERVED CONDITION CORRECTION ACTION ANALOG OUTPUT NOISE ON INPUT SLOWL
17. ming goods as provided in the following paragraphs In the event Purchaser believes the goods are defective the goods must be returned to HFC transportation prepaid by Purchaser within twelve 12 months after delivery of goods or eighteen 18 months for goods delivered outside he continental nited States for inspection by HFC If HFC s inspection determines that the workmanship or materials are defective the goods will be either repaired or replaced at HFC s sole determination free of additional charge and the goods will be returned transportation paid by HFC using he lowest cost transportation available Prior to returning the goods to HFC Purchaser must obtain a Returned Material Authorization RMA Number from HFC s Customer Service Department within 30 days after discovery of a purported breach of warranty but no later than the warranty period otherwise such claims shall be deemed waived See the Return Requests Inquiries Section of this manual If HFC s inspection reveals the goods are free of defects in material and workmanship or such inspection reveals the goods were improperly used improperly installed and or improperly selected for service intended HFC will notify the purchaser in writing and will deliver the goods back to Purchaser upon i receipt of Purchaser s written instructions and ii the cost of transportation If Purchaser does not respond within thirty 30 days after notice from HFC the goods will be dis
18. posed of in HFC s discretion HFC does not warrant these goods to meet the requirements of any safety code of any state municipality or other jurisdiction and Purchaser assumes all risk and liability whatsoever resulting from the use thereof whether used singly or in combination with other machines or apparatus This warranty shall not a ly to any HFC goods or parts thereof which have been repaired outside HFC s factory or altered in any way or have been subject to misuse negligence or accident or have not been operated in accordance with HFC s printed instructions or have been operated under conditions more severe than or otherwise exceeding those set forth in the specifications for such goods THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESSED IMPLIED INCLUDING ANY IMPLIED WARRANTY MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE HFC SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OR LOSS OF USE OF THE GOODS WITHOUT LIMITING THE GENERALITY OF THE FOREGOING THIS EXCLUSION FROM LIABILITY EMBRACES THE PURCHASER S EXPENSES FOR DOWNTIME OR FOR MAKING UP DOWNTIME DAMAGES FOR WHICH THE PURCHASER MAY BE LIABLE TO OTHER PERSONS DAMAGES TO PROPERTY AND INJURY TO OR DEATH OF ANY PERSONS HFC NEITHER ASSUMES NOR AUTHORIZES ANY PERSON TO ASSUME FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE OR USE OF HFC S GOODS AND THERE ARE NO ORAL AGREEMENTS OR WARRANTIES CO
19. ure Wires should be neatly dressed near the bottom of the enclosure to prevent problems when the cover is installed Connect two conductor shielded cable from the flowmeter Connect shield to ACC18B only 7 of 19 HP 209 Unit is powered by a DC voltage which must be within 8 to 35 volts Connect power as outlined in installation drawing Figure 2 1 Installation wiring 0 POWER ACC T8B 5 A OUTPUT SHIELD ACC 18B 8 of 19 HP 209 3 FUNCTIONAL DESCRIPTION 3 1 INTRODUCTION The ACC18B is a two wire current transmitter which will provide an analog output current proportional to rate of flow The unit is intended to provide the user with a suitable interface between a flow measurement sensor and a data acquisition system PRINCIPLE OF OPERATION ACC 18B A block diagram showing functional blocks of the unit is depicted in Figure 3 1 The principle of operation is as follows The electronics unit receives the signal form the flowmeter pickup coil and converts it to a current output proportional to flow rate The electronics unit requires loop power of 8 to 35 VDC The frequency signal which is generated from the flowmeter is connected to the ACC18B with a twisted shielded pair cable The signal enters the SENSITIVITY control which is used to reject unwanted noise by raising the trigger threshold above the background noise present The low level
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