Model ACC27 Signal Conditioner
Contents
1. REPAIR OR REPLACE PART NUMBER DESCRIPTION ACC27 1 1 C 1 OPEN COLLECTOR PULSE OUTPUT ACC27 2 1 1 TTL CMOS PULSE OUTPUT ACC27 3 1D C 1 AC SQUARE WAVE ACC27 5 1 CO 1 0 TO 10 VDC PULSE OUTPUT ACC 27 Page 14 of 14 HP 2462. 46 Figure 1 3 Explosion Proof Case Style 3 1 NPT 3 13 16 ALL DIMENSIONS ARE IN INCHES Figure 1 4 NEMA 4 Case Style 5 ALL DIMENSIONS ARE IN INCHES ACC 27 Page 4 of 14 HP 246 1 6 ACC 27 SHIPPING AND HANDLING CAUTION The ACC27 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 itsSTATIC 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 provided RMA number on all paperwork and shipping boxes Page 5 of 14 HP 246 THIS PAGE LEFT INTENTIONALLY BLANK ACC 27 Page 6 of 14 HP 246 2 24 INSTALLATION INSTA
3. ACC 27 SIGNAL CONDITIONER USER S MANUAL HP 246 August 2004 HOFFER FLOW CONTROLS INC The Turbine Flowmeter Company 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 CONTROLES 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 provided as an aid in installing connecting 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 each item to be connected and locate the appropriat
4. HE 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 Preface ein ED II ILI ILI 1 l Introduction A AN 1 1 1 Introduction es AE AS A NA 1 1 2 Performance Characteristics eese bs m ern en 1 1 3 Ordering Information 03 346 ee ee eb 2 Li A ee ee ee 3 1 5 Enelosure Details 232 ato sei ela Ban tan aD al ea el Be di 3 1 6 Shipping and Handling aii DI os 5 2 A AAA ee eub tar Sed ed retis thu p hri ard ipsc Dean tct dg 7 21 Installation Wiring Layout for Interconnections 0 ee eee eee eee ooo 7 2 2 Installation of the ACC 27 see era da A Ira a 7 3 Punctional Descipti n IS A AAA A 9 3 1 Intr duelion viva a ihn E E dde dus 9 3 2 Principle of Operation oa Rieke SEE E ame iaia 9 4 Calibration Procedure LA ae Qe nta 11 4 1 Introduction vici A ra ea ae 11 4 2 Required Test Equipment 235 rar Sa e x SOIN en x x RO e CRISIS 11 4 3 Conttols and Adjustments assai Hz 11 MERCI EET TEES TL ROT MOT atta 13 5 1 Introducir oth od E E eat 13 5 2 Trouble Shooting and Maintenance LL 13 5 3 Replacement Pats yes rer e pi 14 ACC 27 HP 246 THIS PAGE LEFT INTENTIONALLY BLANK ACC 27 HP 246 PREFACE ACC 27 This manual provides all the necessary information to correctly install operate maintain and troubleshoot the Model ACC 27 signal con
5. I NEMA 3 4 7 B C D 9 E F G CERTIFIED CENELEC CSA UL FM BODY KILARK HKB STOCK 4200 0406 DOME COVER STOCK 5200 0405 KILARK HK2D NOTE INSERT X IN MODEL NUMBER FOR EVERY OPTION NOT SPECIFIED ACC 27 Page2 of 14 HP 246 1 4 WARRANTY 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 252 331 1997 or 800 628 4584 for issuance of a Returned Material Authorization RMA number 1 5 ENCLOSURE DETAIL The ACC27 may be packaged in either the General Purpose case Style 1 in an Explosion Proof case Style 3 or in the Nema 4 case Style 5 Dimensions are given in Figures 1 2 1 3 1 4 and 1 5 Figure 1 2 General Purpose Case Style 1 ALL DIMENSIONS ARE IN INCHES 125345 RR H FLOW CONTROLS INC ELIZABETH CITY NC ACC 27 Page 3 of 14 HP 2
6. LLATION 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 flowmeter 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 The turbine flowmeter equipped with Modulated Carrier Pickup MCP should not be located more than 100 feet from the Modulated Carrier Conditioner It is recommended that the Modulated Carrier Conditioner be installed on or near the flowmeter to assure proper operation 2 2 INSTALLATION OF ACC 27 ACC 27 The Model ACC 27 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 the appropriate terminals for interconnections Connections to the terminal block should be carefully dressed to avoid having bare wi
7. S please have the FOR NON WARRANTY REPAIRS OR following information available BEFORE contacting CALIBRATIONS consult HOFFER FLOW HOFFER FLOW CONTROLS CONTROLS for current repair calibration charges Have 1 P O number under which the product was the following information available BEFORE contacting PURCHASED HOFFER FLOW CONTROLS 2 Model and serial number of the product under 1 P O number to cover the COST of the warranty and repair calibration 3 Repair instructions and or specific problems relative 2 Model and serial number of the product and to the product HFC 9708 3 Repair instructions and or specific problems relative to the product 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 nonconforming goods as provided in the following paragraphs In the even
8. T Pickup Type compatible with Series MCP pickoff Transmission distance dependent on output waveform and drive requirements Cable type Belden 8422 Modulation frequency range 10 5 Hz to 3500 Hz PULSE OUTPUT Open collector VMOS transistor 2N6660 Maximum OFF state voltage 60 VDC Maximum ON current 1 0 amps TTL CMOS fanout of 10 TTL CMOS loads AC capacitively coupled square wave POWER INPUT 10 5 TO 35 VDC AT 45 Ma PHYSICAL Operating 0 70EC Storage 20 70EC ENCLOSURE General purpose case standard Nema 4 Explosion Proof enclosure Page 1 of 14 HP 246 1 5 ORDERING INFORMATION BASIC MODEL ACC27 IC PULSE OUTPUT INPUT POWER ENCLOSURE STYLE PULSE OUTPUT MODEL ACC27 OPTION 1 OPEN COLLECTOR 2 TTL CMOS 3 A C SQUARE WAVE 5 0 10 V SQUARE WAVE INPUT POWER MODEL ACC27 0 C OPTION 1 D C VOLTAGE 15 35 VDC OPTIONAL FEATURE MODEL ACC27 C OPTION PS PULSE SCALING DIVIDE BY 2 4 8 16 32 64 128 256 ENCLOSURE STYLE MODEL ACC27 9 4 IC OPTION 1 STYLE 1 CASE GENERAL PURPOSE 3H O MEETS CLASS 1 DIV 1 AND 2 GROUP D ONLY CLASS IL GROUPS E F G CLASS III NEMA 4X WITH O RING CERTIFIED CSA UL BODY KILARK GECCT 3 STOCK 200 0945 FLAT COVER STOCK 3200 0533 KILARK GECBC 3BH O MEETS CLASS I DIV 1 AND 2 GROUPS A B C D CLASS 1 ZONES 1 AND 2 GROUPS IIB H2 ITA CLASS II DIV 1 AND 2 GROUPS E F G CLASS I
9. ajority of repairs can be made in the field thereby reducing the time a unit is out of service 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 ACC 27 Page 13 of 14 HP 246 OBSERVED CONDITION POSSIBLE CAUSE CORRECTIVE ACTION UNIT DOES NOT PRODUCE A PULSE OUTPUT WITH FLOW PRESENT PULSE OUTPUT WITH NO FLOW PRESENT POWER LOSS BAD PICKUP COIL OR CABLE STALLED TURBINE FLOWMETER BAD ACC27 SENSITIVITY ADJUSTED FULLY COUNTER CLOCKWISE INPUT NOISE BAD PICKUP COIL OR CABLE EXTREME SHOCK OR VIBRATION OF PIPING POWER SUPPLY MALFUNCTION BAD ACC27 5 3 REPLACEMENT PARTS CHECK INTERCONNECTING WIRING AND HOST SYSTEM CHECK PICKUP COIL AND CABLE FOR CONTINUITY AND LEAKAGE REPLACE AS REQUIRED REMOVE FLOWMETER AND REPAIR AS REQUIRED BY MANUFACTURERS RECOMMENDATIONS REPAIR OR REPLACE ADJUST SENSITIVITY TURN SENSITIVITY CCW UNTIL FALSE OUTPUT STOPS CHECK PICKUP COIL AND CABLE FOR CONTINUITY ANDLEAKAGE REPLACE AS REQUIRED DAMPEN OR RELOCATE PIPING CHECK AND REPAIR AS REQUIRED
10. d sensitivity level above the ambient noise pickup PULSE SCALING A six position dip switch used to provide a scaled pulse output of 2 24 8 16 and 32 as selected by the manual depression of switch Other scaling factors may be optionally selected through a factory wired jumper option These additional factors are 64 standard if not specified 128 and 256 NOTE IT IS NECESSARY TO OPEN THE COVER OF THE ENCLOSURE BY REMOVING TWO SCREWS ON SIDE OF BOX AND LIFTING COVER THE PRINTED CIRCUIT CARD IS ATTACHED THE PULSE SCALING DIP SWITCH MAY BE PROGRAMMED WITH A PEN INPUT POWER SHOULD BE REMOVED DURING THIS STEP ACC 27 Page 11 of 14 HP 246 Figure 4 1 Control and Adjustment Detail NOTE SELECT ONE SWITCH ONLY ALL OTHER SWIICHES MUST BE OFF INSTRUCTIONS FOR SELECTING A SWITCH 1 REMOVE COVER PRINTED CIRCUIT ASSEMBLY 2 SWITCH BY USING TURN DN DESIRED A BALL POINT PEN OR SIMILAR OBJECT SEE CHART BELOW 3 REASSEMBLE IN LOWER CASE TABLE ONE li ss ie a SWITCH 2 IS DEPRESSED FOR ILLUSTRATIVE PURPOSES ONLY 1 Figure 4 2 Test Setup OSCILLOSCOPE FREQUENCY COUNTER COM INPUT COM INPUT TB ACC 27 gt Ta 10 100uF AUDIO OSCILLATOR Dei CAPACITOR THz 2KHz 20mVp p COM LOLA ON DE DC POWER SUPPLY ACC 27 Page 12 of 14 HP 246 5 MAINTENANCE 5 1 INTRODUCTION Hoffer Flow Controls flow measurement systems are constructed to give a long service life in the targeted meas
11. ditioner The ACC 27 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 and Maintenance and Troubleshooting Illustrations have been used to improve the clarity of information provided in this manual ST HP 246 THIS PAGE LEFT INTENTIONALLY BLANK ACC 27 iii HP 246 1 INTRODUCTION 1 1 INTRODUCTION The ACC 27 Modulated Carrier Conditioner Converter is an active pickoff accessory for the turbine flowmeter which provides a pulse output proportional to flow rate The Modulated Carrier eliminates the pickoff drag associated with conventional magnetic pickoffs resulting in a significant increase in the usable range of a turbine flowmeter at lower flow rates The ACC 27 excites a series MCP pickup mounted on the turbine flowmeter Sensed through the flowmeter body the motion of the turbine rotor modulates the coil field subsequent conditioning provides a pulse output signal where each pulse is representative of a discrete volume of fluid and where the frequency is proportional to flow rate Flowmeters compatible with the ACC 27 are available in nominal sizes below two inches Larger flowmeters do not benefit from a modulated carrier pickup 1 2 PERFORMANCE CHARACTERISTICS ACC 27 INPU
12. e manual s and or drawing s Identify all model numbers exactly before making any connections A number of options and 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 AII rights are reserved No part 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 package and on any correspondence FOR WARRANTY RETURN
13. he 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 apply 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 OR IMPLIED INCLUDING ANY IMPLIED WARRANTY OF 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 COLLATERAL TO OR AFFECTING THE AGREEMENT PURCHASER S SOLE AND EXCLUSIVE REMEDY IS T
14. res extend pass the screw clamp on the terminal block This is particularly important for units mounted within the explosion proof enclosure Wires should be neatly dressed near bottom of enclosure to prevent problems when cover is installed Connect two conductor shielded cable from flowmeter to terminals 1 and 2 Connect the shield to terminal 3 Ground the shield at one end only Unit is powered by a DC voltage which must be within 10 5 35 VDC Connect the plus voltage to terminal 6 and the power return to terminal 5 The output signal from the ACC27 is available in several forms see model number designation for output type specified For pulse output connect wire to terminal 4 and connect pulse common to terminal 5 Page 7 of 14 HP 246 Figure 2 1 Installation Wiring CNI MS 3106A 105L 35 TO FLOWMETER PICKUP COIL PULSE OUTPUT POWER COMMON POWER OUTPUT oc PONER INPUT ACC 27 Page 8 of 14 HP 246 3 FUNCTIONAL DESCRIPTION 3 1 INTRODUCTION The ACC27 is a preamplifier which will provide a frequency pulse output 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 3 2 PRINCIPLE OF OPERATION A block diagram showing functional blocks of the unit is depicted in Figure 3 1 The principle of operation is as follows The MCP pickup on the turbine flowmeter is connected to the ACC27 and forms part of an o
15. scillator circuit which is excited by the ACC27 Motion of the turbine flowmeter rotor modulates the oscillator output A demodulator circuit converts the AM signal to a signal at a frequency proportional to the flowrate The low level demodulated 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 pulse scaling option provides an eight stage binary divider to scale down the output frequency to a slower repetition rate The scaling factor may be optionally selected as the pulse train is then fed into the output stage which will generate the required pulse output level desired Figure 3 1 Block Diagram 10 5 35 voc ACC 27 Page 9 of 14 HP 246 THIS PAGE LEFT INTENTIONALLY BLANK ACC 27 Page 10 of 14 HP 246 4 CALIBRATION PROCEDURE 4 1 INTRODUCTION In general all flow measurement systems supplied by Hoffer Flow Controls have been factory tested and configured as specified by the user at the time of purchase free of charge The ACC27 requires no field calibration 4 2 REQUIRED TEST EQUIPMENT In order to adjust the Sensitivity and troubleshoot the ACC27 the following suggested equipment list is provided MANUFACTURE PART NUMBER DESCRIPTION 4 3 CONTROLS AND ADJUSTMENTS SENSITIVITY A twenty turn control used to set the threshol
16. t 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 United 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 1 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 disposed of in HFC s discretion HFC does not warrant these goods to meet t
17. uring field and service environment However problems do occur from time to time and the following points should be considered for preventive 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 preventive maintenance schedule should be established to determine the amount of wear which has occurred since last overhaul See users 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 recommended spare parts list may be found following this section and in the users 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 5 2 TROUBLE SHOOTING AND MAINTENANCE Es ALL PRINTED CIRCUIT CARDS ARE WARRANTED FOR ONE YEAR AFTER DATE OF SALE ALL PRINTED CIRCUIT CARDS MAY BE FACTORY 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 m
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