- 1 - User`s Manual: Series 250T AC Current Input
Contents
1. Actomag mixon 28 0 98 oe Rev ez RE ENCLOSURE 4X OPTION 2507 24501086 H 222 MOUNTING SCREWS 2 PLACES 6 20 THD 0 313 INCH 3 SERIES 2591 TRANSMITTER SHOWN INSTALLED IN ENCLOSURE WITH COVER REMOVED SERIES 250 TRANSMITTER WITH DISPLAY OPTION SHOWN REMOVED FROM ENCLOSURE NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS 4 875 123 83 1 000 25 40 1 000 ke 25 40 ENCLOSURE DIMENSIONS 4 OPTION ee E DIMPLE PROVIDED FOR DRILLING A 0 283 7 19 DIAMETER HOLE 2 PLACES OVER SOLID FRONT FACE 75 19 0 NPT 2 PLACES MICH mY 00 ENCLOSURE 4XDx OPTION o sr 1 1 4501 087 sas Acromag 28 sal KG KG DAE rev OR O RING GASKET FRONT FACE MOUNTING SCREWS 2 PLACES 6 32 THD 25 INCH SERIES 2591 TRANSMITTER SHOWN INSTALLED IN ENCLOSURE WITH COVER REMOVED 4 60 116 84 1 09 25 4 9 75 19 05 SERIES 2507 TRANSMITTER 2 PLACES ENCLOSURE ENCLOSURE DIMENSIONS OPTION MICH 98 90 TW ke Tene ore NOTE ALL DIMENSIONS ARE2. INTRODUCTION These instructions cover the model types listed in Table 1 below Supplementary sheets are attached for units with special options or features Table 1 A Model Number Format 250T Input Mounting Display Certification Typical Model Number 250T CACX XPD1 NCR Certification NCR Mounting Display Notes Table 1 1 All units are factory calibrated no suffix is needed 2 Consult the factory for current information on agency e g Canadian Standards Association etc approvals DESCRIPTION These two wire transmitters are used in conjunction with an external AC Current Sensor to condition an AC current input signal and convert this signal to a 4 to 20mA process current output An AC Current Sensor is supplied with each transmitter a highly accurate toroidal instrument transformer The AC Current Sensor is fully insulated and designed to mount near the source of the AC current It transmits a safe low level DC milliamp signal to the transmitter Both the AC Current Sensor and transmitter are isolated for up to 250V AC or 345V DC peak between input and output The transmitters are RFl protected operate over a wide temperature range and feature excellent temperature coefficients which minimize effects from the harsh plant environment The transmitter has various mounting and enclosure options available See Drawing 4501 3
3. Factory Mutual etc approvals NCR No Certification Required INSTALLATION The transmitter is packaged in a general purpose plastic housing and optionally mounted within a variety of protective enclosures The transmitter should be located in an area that is protected from dust moisture and corrosive atmospheres The enclosure type determines the protection afforded in a particular environment and location make sure that this is not compromised Maximum operating ambient temperature should be within 13 F to 185 F 25 C to 85 C for satisfactory performance Series 250T User s Manual AC Current Input External Sensor Two Wire Transmitter Factory calibrated units are ready for installation Connect as shown in Connection Drawing 4501 377 and 4501 380 Refer to the CALIBRATION section to verify calibration Mounting Mount transmitter assembly refer to appropriate outline drawing for mounting and clearance dimensions Determine which configuration is utilized and consult the proper mounting instructions listed below 1 DIN Rail Mounting Use suitable fastening hardware to secure the DIN rail to the designated mounting surface A transmitter ordered with the DIN Rail mounting option can be mounted to either the or Rail Installation of the transmitter to the rail depends on the type of DIN rail used see Drawing 4501 080 Units can be mounted side by side on 1 0 inch centers if required 2 S
4. SUPPLY OUTPUT TRANSMITTER 2 ADJUSTMENTS OPTIONAL RIPPLE FILTER OUTPUT CURRENT SENSE 1 TYPICAL NOTE A 10 OHM SERIES RESISTOR IS BUILT IN 0 17 25 MEASUREMENT RANGE 15 40 200 FOR 4 2 3 5 DISPLAY SPAN ADJUST Dz Je DISPLAY ZERO ADJUST Actomag Series 2501 DISPLAY 4 HeH ADJUSTMENTS SENSOR SIGNAL SENSOR SIGNAL mA DO mA DC 5 SERIES 250 5 ac AMPS lpg mA TRANSMITTER DISPLAY OPTION eS NPUT SEE DRAWING 4501 380 FOR MORE INFORMATION mA DC SERIES 250 AC CURRENT INPUT W EXTERNAL CURRENT SENSOR ELECTRICAL CONNECTIONS CAUTION DO NOT CONNECT AC CURRENT DIRECTLY TO INPUT TERMINALS aE Pest CURRENT L Acromag SENSOR 0 MICH ea W i MODEL 5020 350 ME SERIES 2507 CACX INPUT CONNECTION 1 2 37 De ts ee he G 250 28 T CACX 350 450 TRANSMITTER i INPUT FIGURE 1 CONNECTION 18 GA WIRE 5 OHMS AC CURRENT CAUTION DO NOT CONNECT ESAE AC CURRENT DIRECTLY TO TRANSMITTER INPUT TERMINALS NOTE ONE AC SENSOR IS INCLUDED WITH EACH FIGURE 2 550 MODULE PASSIE ROUGH CENTER HOLE TABLE 1 TURNS CHART SEE INPUT RANGE SELECTION TABLE INPUT RANGE SELECTION ACROMAG MODEL 5020 2550 AC CURRENT SENSOR CONNECTI
5. Tour MICK TRANSMITTER DISPLAY ASSEMBLY 51 ie SERIES 2501 TRANSMITTER SHOWN IN ENCLOSURE WITH COVER OPEN NOTE ROOM 15 AVAILABLE FOR A SECOND UNIT WITH THE 5 SURFACE MOUNT OPTION ORDER SEPARATELY NOTE ALL DIMENSIONS ARE iN INCHES MILLIMETERS GROUND WIRE CONNECTION SEE NOTE 1 JESE NOTES 1 THESE SPECIFIC CLAMPS ON NEMA 4 ENCLOSURES ONLY CONDUIT MOUNTING HOLES AND FITTINGS ARE CUSTOMER SUPPLIED 0 313 7 9 DIA HOLE 4 PLACES 4 N12 OPTION ENCLOSURE DIMENSIONS 1 Acromag ore MICH L Keike rev oz ENCLOSURE 4 amp 12 OPTION p 250T 1 1 94501 83 L MOUNTING SCREWS 2 PLACES 6 20 THD 313 INCH SERIES 2507 TRANSMITTER SHOWN INSTALLED IN ENCLOSURE WITH COVER REMOVED OUTPUT SERIES 2501 TRANSMITTER SHOWN REMOVED FROM ENCLOSURE NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS Es gt Rr 4 875 123 83 6 312 160 32 25 40 ar ee 123 83 1 000 K ENCLOSURE DIMENSIONS 4 OPTION 25 40 4 125 104 78 9 75 19 0 NPT 2 PLACES DIMPLE PROVIDED FOR DRILLING A 0 283 7 19 DIAMETER HOLE 2 PLACES OVER SOLID FRONT FACE E
6. IN INCHES MILLIMETERS ENCLOSURE XP OPTION 094 25 1 4501 4 6 32 THD SERIES 2507 TRANSMITTER WITH DISPLAY OPTION SHOWN IN ENCLOSURE WITH COVER REMOVED SERIES 2501 TRANSMITTER WITH DISPLAY OPTION SHOWN REMOVED FROM ENCLOSURE NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS A C OUNTING SCREWS 2 PLACES O RING GASKET 0 25 INCH COVER GLASS WINDOW SHOWN WITH DISPLAY MODULE ENCLOSURE DIMENSIONS 0 75 NPT 19 05 0 8 2 PLACES O RING GASKET XPDx OPTION ere 9 _ Eno f cur ENCLOSURE OPTION OPPS 25 _ i 1 4501 085 G Acromag 9 Supplemental Instructions MODEL 5020 350 AC Current Input External Sensor Modules IMPORTANT SAFETY CONSIDERATIONS IMPROPER CONNECTIONS OR CONNECTING TO MODULE INPUTS FROM ANYTHING OTHER THAN THE SUPPLIED AC CURRENT SENSING TRANSFORMER COULD CAUSE PERMANENT DAMAGE TO THE MODULE AND CREATE A SAFETY HAZARD TO THE USER PLEASE READ THE FOLLOWING AND REFER TO THE CONNECTION DRAWINGS ON THE REVERSE SIDE BEFORE INSTALLATION This AC current input module is used in conjunction with an external AC Current Sensor to pre condition the AC current input signal The sensor is a highly accurate toroidal instrument transformer used to convert the AC current signal to a safe low level DC milliamper
7. be used with any AC Current Sensor Acromag Model 5020 350 The AC current input span is a simple function of the number of primary turns placed on the AC Current Sensor and the sensor transmitter calibration is not affected by this Refer to Applications A and B of Drawing 4501 380 This method of changing ranges is much easier more accurate and convenient TRANSMITTER OUTPUT 250T SENSOR PRIMARY TURNS AC CURRENT INPUT RANGE Oto 5Amps AC 0 to 20 Amps AC 0 to 10 Amps AC Oto 2 Amps Oto 1Amps AC The transmitter is available for DIN rail mounting Surface Mounting 3 inch SNAPTRACK plastic rail mounting or in various housings These housings include NEMA 4 12 4X and explosion proof enclosures The model number of the unit specifies the mounting enclosure type The transmitter mounted in the explosion proof enclosure is available with a 3 1 2 digit LCD readout 1 2 inch height to provide a visual indication of the transmitter s output The readout is available in percent of span or engineering units and is scaled to customer requirements Input wiring is inserted in the bottom of the unit while output wiring is inserted in the top of the unit Screws to secure the wiring are located on the front panel Connectors are screw clamp type and accept wire size up to 14 AWG SPECIFICATIONS Function This family of isolated two wire transmitters utilize an external AC Current Sensor t
8. the enclosure Position the unit at an angle that permits all wiring to be routed unobstructed through both ports If the transmitter has the display option make sure the orientation of the display allows for easy reading once installed Secure the transmitter assembly to enclosure using two screws Electrical Connections The wire size used to connect the unit to the control system is not critical All terminal strips can accommodate wire from 14 26 AWG Strip back wire insulation 1 4 inch on each lead before installing into the terminal block Input wiring may be shielded or unshielded twisted pair Output wires should be twisted pair Since common mode voltages can exist on signal wiring adequate wire insulation should be used and proper wiring practices followed It is recommended that output power wiring be separated from signal wiring for safety as well as for low noise pickup 1 Output Power Connect a DC power supply and load per Connection Drawing 4501 377 Power supply voltage is not critical and normally should be from 12 50V DC The supply voltage must not exceed 75 volts even instantaneously The power supply voltage must be adequate to furnish full scale current to the load s plus transmission line drop plus 12V DC terminal voltage to the transmitter Variations in power supply voltage or load resistance have negligible effect on transmitter accuracy Ripple and Noise Power supply ripple at 60 2 120 2 is reduced a
9. these output wires are attached to one end of a cable user supplied and the other end connects to the transmitter s input and terminals Input Burden A function of the wire gauge resistance used for the primary turns Input Overload The AC Current Sensor withstands overloads as follows 20 times full scale for 0 01 second 10 times full scale for 0 1 second 5 times full scale for 1 0 second AC Current Sensor to Transmitter Wiring Distance 400 feet maximum for 18 AWG wire gauge Other wire gauges can be used as long as the resistance of both wires is less than 5 0 ohms Series 250T User s Manual AC Current Input External Sensor Two Wire Transmitter Transmitter 250T CACX CACX Input is DC milliamperes from the AC Current Sensor supplied with the transmitter The Input to the transmitter is 0 to 11 17mA DC output of the AC Current Sensor This signal represents 0 to 5 Amps AC with 4 primary turns at the input to the AC Current Sensor or any other AC current range a function of primary turns Changing the number of primary turns does not change the calibration of the transmitter only the input range is affected Isolation Both Sensor and Transmitter The input circuit is electrically isolated from the output allowing the input to operate at up to 250V AC or 354V DC off ground on a continuous basis will withstand 1500V AC dielectric strength test for one minute without breakdown This compl
10. 83 for a simplified schematic Series 250T User s Manual AC Current Input External Sensor Two Wire Transmitter Following basic two wire design the output and the DC power share the same pair of twisted copper wires The transmitter acts similar to a variable resistor in series with the load and DC supply and provides an output loop current proportional to the input sensor signal See Drawing 4501 383 for a typical installation The benefits to using an external sensor external from the transmitter enclosure include the following 1 Low losses It is not practical to run AC currents over long distances because of significant resistance voltage drops at high currents However a low level DC milliampere signal is output from the AC Current Sensor and can be transmitted safely over long distances allowing the transmitter to be remotely located some distance from the AC power wiring 2 Safety The AC Current Sensor s output leads can be open or short circuited and these conditions do not affect the AC current loop or cause damage to the sensor Likewise the wires connecting the AC Current Sensor to the transmitter can be easily removed from the transmitter s input terminals without concern or hazard 3 Ease of Calibration The AC current input range can be easily scaled in the field by simply changing the number of primary turns at the sensor with no additional calibration required The transmitter is factory calibrated and can
11. 9 3 55 90 17 SCREWDRIVER SLOT FOR REMOVAL FROM RAIL 5 6 Acromag Dare Rev ECW or enc fa ME 25 T HOUSING DIN RAIL MOUNT ENCLOSURE DIMENSIONS DIN RAIL MOUNTING OPTION NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS 1 1 4501 080 5 A B I ral D I E F NOTE PLASTIC ENCLOSURE SNAPS NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS TOGETHER AT SEAMS WIRE INSERTION SCREWDRIVER WIRE INSERTION LOCATION 2 PLACES LOCATION 2 PLACES MOVAL 2 89 gt 73 41 1 3 10 3 30 78 75 83 82 MTG SLOTS 148 3 756 WIDE 3 80 TO CLEAR 6 SCREWS 2 PLACES 96 52 NOTE 1 PLASTIC RAIL ENCLOSURE DIMENSIONS ENCLOSURE DIMENSIONS AEN a SURFACE MOUNTING SNAPTRACK MOUNTING SM OPTION 5 OPTION ee virom wien 29 AUG oo eno Tow NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS me HOUSING SM 5 OPTION 28 2971 191 4501 081 2501 TRANSMITTER ASSEMBLY FOR XPDx ENCLOSURES NOTE TO REMOVE TRANSMITTER FROM DISPLAY ASSEMBLY PROCEED AS FOLLOWS A REMOVE SCREWS ITEM A 2 PLACES PULL DISPLAY ASSEMBLY AND DISPLAY MTG BRACKET FROM TRANSMITTER A SIX PIN CONNECTOR WILL DISCONNECT FROM TRANSMITTER FOR ACCESS TO INTERNAL CONFIGURATION JUMPERS TAKE PLASTIC ENCLOSURE APART AT S
12. ATION TITLE AC CURRENT SENSOR ELEC CONNECTIONS SERIES 5020 530 1 or 1 4501 636 on
13. Acromag S User s Manual Series 250T AC Current Input External Sensor Two Wire Transmitters Table of Contents Introduction List of Drawings Typical Installation 8 Simplified Schematic 4501 383 7 Electrical Connections CACX Input 4501 377 si 8 Electrical Connections AC Current Sensor 4501 380 9 Dimensions DIN Rail Mounting 4501 080 1 Dimensions Surface amp Snaptrack Mounting 4501 081 4 Mechanical Assembly Mounting amp 4X Enclosures 4501 082 12 NEMA 4 amp 12 Enclosures 4501 083 1 13 NEMA 4X Enclosure 4501 086 14 NEMA 4X Enclosure with Window 4501 087 15 Explosion Proof Enclosure 4501 084 dd 16 Explosion Proof Enclosure with Window 4501 085 2 17 IMPORTANT SAFETY CONSIDERATIONS It is very important for the user to consider the possible adverse effects of power wiring component sensor or software failures in designing any type of control or monitoring system This is especially important where economic property loss or human life is involved It is important that the user employ satisfactory overall system design It is agreed between the Buyer and Acromag that this is the Buyer s responsibility Acromag Inc 30765 Wixom Road P O Box 437 Wixom Michigan 48393 7037 USA Tel 248 624 1541 FAX 248 624 9234 Copyright 1994 Acromag Inc Printed in the USA Data and specifications are subject to change without notice 8500 501 A94A000
14. EAMS USING A FLAT BLADE SCREWDRIVER 0 MOUNTING BRACKET ITEM 15 HELD IN PLACE BY THE TWO HALVES OF THE PLASTIC ENCLOSURE OUTPUT Acromag Series 250T TRANSMITTER ASSEMBLY WITH DISPLAY ASSEMBLY MOUNTED DISPLAY ASSEMBLY REMOVED DISPLAY ASSEMBLY SHOWN PARTIALLY REMOVED FROM TRANSMITTER DISPLAY ASSEMBLY COMPONENT PARTS A FACTORY UNIT ASSEMBLY BLACK PLASTIC DISPLAY TRANSMITTER ASSEMBLY 2 ENCLOSURE REMQVAL NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS OUTPUT TERMINALS DISPLAY ELECTRICAL CONNECTION NOTE DO NOT REMOVE BLACK SCREWS 2 PLACES DISPLAY ASSEMBLY TO TRANSMITTER 6 HOLES SCREW 6 29 PAN HEAD REMOVAL DISPLAY ASSEMBLY CONNECTION PINS STEEL THREAD CUTTING SHOWN EXTRACTED FROM PART 1010 5349 TRANSMITTER 6 PINS ALUMINUM DISPLAY 2 PLACES MTG BRACKET SCREW 2 PLACES OUTPUT 6 32 THD 0 25 INCH S DISPLAY OUTPUT CIRCUIT TERMINALS ASSEMBLY DISPLAY ELECTRICAL CONNECTIONS MOUNTING DISPLAY TRANSMITTER To ELECTRICAL CONNECTIONS BRACKET TRANSMITTER 6 PINS DISPLAY SPAN ADJUST DISPLAY ZERO ADJUST DISPLAY ASSEMBLY SHOWN ASSEMBLED TO TRANSMITTER AND SECURED BY TWO SCREWS INPUT TERMINALS TRANSMITTER ASSEMBLY WITH r 14 APR 94 40007 TAV 28 AUG 98 TTav Ke
15. O DISPLAY WINDOW or Drawing 4501 085 WITH DISPLAY WINDOW for outline and clearance dimensions Enclosure Materials Body and cover Copper free aluminum less than 0 4 Glass lens Heat tempered glass Gasket Neoprene Finish Corro free epoxy powder coat color gray Hub size 0 75 inch Quantity 2 Housing meets Class Groups B C amp D Class II Groups E F amp G Class III and NEMA 4 water tight requirements Transmitter is mounted within the enclosure at the factory XP Explosion Proof Water Tight Enclosure No Window Shipping weight 5 pounds 2 3 Kg packed XPD1 Explosion Proof Water Tight Enclosure With Window Includes the Standard Display Option D1 Shipping weight 6 pounds 2 7 Kg packed XPD2 Explosion Proof Water Tight Enclosure With Window Includes the Temperature Display Option D2 Shipping weight 6 pounds 2 7 Kg packed XPD3 Explosion Proof Water Tight Enclosure With Window Includes the Engineering Units Display Option D3 Shipping weight 6 pounds 2 7 Kg packed DISPLAY OPTION The Display is available as an option when specifying the 4X XP Housing The linear display option assembly includes zero and span trim adjustments Display Options include xxD1 Standard Display Option D1 The minimum and maxi mum input any calibration is represented by 00 0 and 100 0 on the display normalized This represents the 4 to 20mA transmitter output w
16. ONS APPLICATION EXAMPLE A AC CURRENT TRANSFORMER C T USER SUPPUED AC CURRENT TRANSFORMER 250T CACX 280T CACX 550 450 INPUT CONNECTIONS INADVERTANT w CAUTION CONNECT TO 4 AC CURRENT SENSOR SENSOR ONLY DANGER AC CURRENT TRANSFORMER C T CONNECTIONS DO NOT CONNECT DISCONNECT POWER OR SHORT OUTPUT OF AC CURRENT BEFORE REMOVING INPUT CONNECTIONS TO AC CURRENT DIRECTLY TO SENSOR IF THIS PROCEDURE IS NOT FOLLOWED AN OPEN INPUT TERMINALS CIRCUIT C T WILL GENERATE HIGH VOLTAGES AND POSSIBLE DAMAGE WILL RESULT L APPLICATION EXAMPLE B 115V 23 VAC ELECTRICAL CIRCUIT 250 280 550 450 INPUT CONNECTIONS CAUTION CONNECT TO AC CURRENT SENSOR ONLY DO NOT CONNECT HIGH VOLTAGE AC CURRENT DIRECTLY TO INPUT TERMINALS NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS 0 984 2 45 25 0 11 43 2 1 WIRE INSERTION CLAMPS 6 PLACES 1 1 a RAIL DIN MOUNTING RAIL DIN MOUNTING SHOWN THIS SIDE SHOWN THIS SIDE 3 DIN EN 50035 32mm DIN EN 50022 35mm 0 RAIL DIN MOUNTING SHOWN HERE DIN EN 50035 32mm RAIL DIN MOUNTING SHOWN HERE DIN EN 50022 35mm 3 14 79 0 1 55 1 55 4 39 4 39 4 NOTE ADJACENT UNITS MOUNTED 2 89 ON 1 0 INCH 25 4mm CENTERS 73 41 3 35 85 0
17. TTER All sensors and transmitters are checked and calibrated for proper performance at the factory before they are shipped The calibration example below is provided for reference Adjustment Procedure Connect the transmitter as shown in Calibration Connection Drawing 4501 383 To simplify transmitter adjustment it is recommended that a DC current method be used For best results the signal current source should be adjustable over the entire input range of the unit and settable to an accuracy of 0 1 or better The power supply voltage must be adequate to furnish full scale current to the load plus wire drop plus 12V DC terminal voltage to the transmitter The output current must be measured to 0 1 accuracy or better for proper results The Zero and Span adjustments are accessible on the front panel of the transmitter see Drawing 4501 383 for location The screwdriver blade used to adjust the potentiometers should not be more than 0 1 inch 2 54mm wide There are no internal jumpers or switches to configure Transmitter Calibration Example MODEL 250T CACX VO DIN NCR Output 4 to 20mA DC Input 0 to 11 17mA DC Note The DC current range that the AC Current Sensor provides to the transmitter is independent of the number of primary turns 1 Setthe input source to 0 000 DC Adjust the Zero 2 pot until the output reads 4 000mA DC 2 Set the input source to 11 17mA DC Adjust the Span 5 pot until the output re
18. Y DISCONNECT POWER TO C T OR SHORT OUTPUT OF C T TO MODULE INPUT BEFORE REMOVING INPUT CONNECTIONS TO AC CURRENT TERMINALS SENSOR IF THIS PROCEDURE IS NOT FOLLOWED AN OPEN CIRCUIT C T WILL GENERATE HIGH VOLTAGES AND POSSIBLE C T DAMAGE WILL RESULT AC CURRENT S AMPS FULL SCALE 4 TURNS FIGURE 2 INSULATED WIRE eee RED APPLICATION EXAMPLE B 115V 230VAC ELECTRICAL CIRCUIT TURN COUNT NUMBER OF WIRES PASSING THROUGH CENTER HOLE SEE INPUT RANGE SELECTION TABLE AC SENSOR 135 gt 4 TIIRNG CHART WIRE NUT TABLE 1 TURNS CHART NOTE DESIGN ALLOWS our INADVERTANT CAUTION OPENSOR SHORTS CONNECTIONS CONNECT MODULE Hm CURRENT SENSOR N ONLY INPUT RANGE SELECTION INPUT RANGE RMS TURNS MIN OTO 10a 2 BLACK ACE es a DO NOT CONNECT Faire s rere Sow AC CURRENT AC CURRENT DIRECTLY FIGURE 3 MODEL 5020 350 MODULE S INPUT HIGH VOLTAGE TERMINALS ACROMAG MODEL 5020 360 6 Acromag 21 96 WIXOM MICH DATE THIS SENSOR IS USED WITH VARIOUS ACROMAG INPUT MODULES tase MODEL 5020 350 AC CURRENT SENSOR REFERENCE THE USER S MANUAL FORTHE ELECTRICAL CONNECTIONS MODULE FOR ADDITIONAL INFORM
19. ads 20 000mA DC 3 Repeat steps 1 and 2 until the readings converge The instrument is now calibrated Several mid point values should also be checked to verify proper operation of the transmitter B DISPLAY Display Adjustment Procedure If your unit has the display option the display is calibrated separately from the transmitter However calibration of the transmitter must be verified FIRST see above procedure before verifying display calibration Refer to Drawing 4501 377 for location of the transmitter s Zero and Span adjustments and the location of the display s Zero and Span adjustments NOTE The display option is factory configured for a particular customer specified range the Zero DZ and Span DS adjustments are trim adjustments only Display Calibration Example MODEL 250T CACX XPD1 NCR Input 0 to 11 17mA DC direct DC mA input to transmitter Display 0 to 100 0 1 Set the input source to 0 000mA DC the Zero point of the transmitter s span Adjust the Zero DZ pot of the Display module for the zero of the display range 0 0 in this example 2 Set the input source to 11 17mA DC the full scale point of the transmitter s span Adjust the Span DS pot on the Display module for the correct full scale display reading 100 0 in this example 3 Repeat steps 1 and 2 until the readings converge The display is now calibrated GENERAL MAINTENANCE The transmitter contains solid state compone
20. d with an AC Current Transformer C T disconnect power to the C T or short the output of the C T before removing the wire going through the AC Current Sensor If this is not done an open circuited C T will generate high voltages hazardous and possible C T damage Series 250T User s Manual AC Current Input External Sensor Two Wire Transmitter The sensor output wires should be connected to the extension cable wires using wire nuts or equivalent Sensor output wires are color coded RED and BLACK proper polarity must be observed B Transmitter Connect the Current Sensor output leads to the transmitter Red to the Transmitter plus terminal Black to the Transmitter minus terminal WARNING The input to the transmitter can only come from the AC Current Sensor output wires Red Black If AC current is directly attached to the transmitter input terminals the transmitter will be destroyed NOTE The transmitter s input circuit is electrically isolated from the output power circuit for voltages up to 250V AC or 354V DC off ground on a continuous basis In this application it is recommended that the minus transmitter input terminal be connected to an earth ground The connections between the AC Current Sensor would be floating if not grounded Grounding eliminates the risk of high common mode voltages from showing up on the wires and reduces noise pickup CALIBRATION A TRANSMI
21. e signal 0 to 11 17mA The module only accepts the isolated low level signal produced by the AC current sensing transformer and cannot be connected directly to the source of AC power without damage or safety risk The AC Current Sensor is fully insulated and designed to mount near the source of the AC current The input AC current range is a simple function of the number of turns placed on the AC Current Sensor see the table below The benefits to using an external sensor external from the module enclosure include the following Low losses It is not practical to run AC currents over long distances because of significant resistance voltage drops at high currents The low level DC milliampere signal output from the AC Current Sensor can be transmitted safely over long distances allowing the transmitter to be remotely located from the AC power wiring e Safety The AC Current Sensor s output leads be open or short circuited and these conditions do not affect the AC current loop or cause damage to the sensor Likewise the wires connecting the AC Current Sensor to the transmitter can be easily removed from the transmitter s input terminals without concern or hazard Ease of Calibration The AC current input range can be easily scaled in the field by simply changing the number of primary turns at the sensor with no additional calibration required That is the AC current input span is a simple function of the number of primary turns placed on t
22. guishing NYLON Type 6 6 polyamide black thermo plastic UL94 V 2 General Purpose NEMA Type 1 enclosure MOUNTING DISPLAY A wide variety of mounting options and enclosures are available to meet the needs of the installation Available models are listed below The transmitter is shipped as a complete assembly General Purpose Housing Available with various mounting options listed below Case Self extinguishing NYLON Type 6 6 polyamide thermoplastic UL94 V 2 color black DIN General Purpose Housing DIN Rail Mount G amp T rails Rail 32mm EN50035 Rail 35mm Type EN5022 Refer to Drawing 4501 080 for outline amp clearance dimensions Shipping Weight 1 pound 0 45 Kg packed SM General Purpose Housing Surface Mount Refer to Drawing 4501 081 for outline amp clearance dimensions Shipping Weight 1 pound 0 45 Kg packed ST General Purpose Housing SNAPTRACK Refer to Drawing 4501 081 for outline amp clearance dimensions Shipping Weight 1 pound 0 45 Kg packed SNAPTRACK is a registered trademark of Reed Devices Inc Series 250T User s Manual AC Current Input External Sensor Two Wire Transmitter NEMA 4 and 12 Enclosures Option types listed below Refer to Drawing 4501 083 for outline and clearance dimensions Transmitter is mounted within the enclosure at the factory These enclosures may accommodate a second Series 250T transmitter with the surface mount option SM opt
23. he AC Current Sensor and sensor transmitter calibration is not affected by this Refer to Applications A amp of the Drawings on the back SENSOR PRIMARY TURNS AC CURRENT INPUT RANGE SENSOR OUTPUT RED BLACK WIRES 0 to 20 Amps AC 0 to 11 17mA DC 0 to 10 Amps AC 0 to 11 17mA DC 010 5 Amps AC 0 to 11 17mA DC Oto 2 Amps AC 0 to 11 17mA DC Oto 1 Amps AC 01011 17 DC The AC Current Sensor is isolated and can be used in AC circuits up to 250V AC 50 or 60 Hz It is designed to be mounted at the source of the AC current to be measured The module can be located remotely from the AC signal and wired using small gauge wire The sensor s output wires can be shorted open circuited or removed from the transmitter s input terminals without hazard to personnel or the AC Current Sensor DANGER If the AC Current Sensor is used with an AC Current Transformer C T disconnect power to the C T or short the output of the C T before removing the wire going through the AC Current Sensor If this is not done an open circuited C T will generate high voltages hazardous and possible C T damage The output wires of the sensor are polarized the Red wire is plus and the Black wire is minus Normally these output wires are attached to one end of a cable user supplied and the other end connects to the module s input Connect the Current Sensor output leads to the module input by connecting Red to the module s plus termi
24. ies with test requirements outlined in ANSI ISA S82 01 1988 for the voltage rating specified Output 4 20mA DC output Note A voltage test signal of 40mV to 200mV is available at the output terminals see Drawing 4501 377 and it represents 4 to 20mA of output current Power An external loop power supply is required 12V DC minimum 50V DC maximum Under no circumstances must the DC supply ever exceed 75 volts peak instantaneously Unit has reverse polarity protection Output Limits typical 3 8mA DC to 26mA DC Load Resistance Range Equation R Load Maximum V supply 12V 20 At 24V supply R Load 0 to 600 ohms Power Supply Effect DC Volts 0 001 of output span per volt DC 60 120 Hz ripple 0 01 of output span per volt peak to peak of power supply ripple Reference Test Conditions Input 0 to 5 Amps AC 60Hz 4 turn primary output 4 20mA into 500 ohm load 77 F 25 C 24V DC supply Accuracy Better than 0 5 of calibrated span This error includes the combined effects of transmitter repeatability hysteresis terminal point linearity adjustment resolution and AC sensor error Ambient Temperature Range 13 F to 185 F 25 C to 85 C Ambient Temperature Effect Less than 0 01 of output span per 0 018 per C over the ambient temperature range for reference test conditions specification includes the combined effects of zero and span over temperature Load Resista
25. ion ordered separately Conduit mounting holes and fittings are customer supplied 4 Water Tight Enclosure NEMA 4 Enclosure material and finish 0 075 and 0 060 inch thick steel with gray hammertone enamel finish inside and out Shipping weight 6 pounds 2 7 Kg packed N12 Oil Tight Enclosure NEMA 12 Enclosure material and finish 0 075 and 0 060 inch thick steel with gray hammertone enamel finish inside and out Shipping weight 6 pounds 2 7 Kg packed Non Corrosive Water Tight Enclosures NEMA 4X Option types listed below Refer to Drawing 4501 086 NO DISPLAY WINDOW or Drawing 4501 087 WITH DISPLAY WINDOW for outline and clearance dimensions Enclosure material ADALEX Finish Gelcoat Transmitter is mounted within enclosure at factory 4 Water Tight Enclosure Non corrosive NEMA 4X Window Shipping weight 5 pounds 2 3 Kg packed 4XD1 Water Tight Enclosure Non corrosive NEMA 4X With Window Includes the Standard Display Option D1 Shipping weight 6 pounds 2 7 Kg packed 4XD2 Water Tight Enclosure Non corrosive NEMA 4X With Window Includes the Temperature Display Option D2 Shipping weight 6 pounds 2 7 Kg packed 4XD3 Water Tight Enclosure Non corrosive NEMA 4X With Window Includes the Engineering Units Display Option D3 Shipping weight 6 pounds 2 7 Kg packed Explosion Proof Water Tight Enclosures Option types listed below Refer to Drawing 4501 084 N
26. ith a resolution of 0 1 of span xxD2 Temperature Display Option D2 Not applicable xxD3 Engineering Units Display Option D3 The minimum and maximum display readings correspond to the minimum and maximum display readings specified for the unit by the customer Display Range The minimum display reading can be from 1999 to 1999 counts while the span range can be from 100 to 2000 counts span counts maximum counts minus minimum counts Note mentally remove the decimal point to determine the display counts The decimal point is configured as required such as 00 0 to 100 0 Display Characteristics The 7 segment reflective Liquid Crystal Display LCD contains 3 1 2 digits 1999 with 1 2 inch character height Also includes a factory programmed 3 position decimal point Optimal view angle is 60 degrees No Output Burden Provides a visual indication of the transmitter output without reducing the output compliance the allowable load resistance range Display Ambient Temperature Range Operating 0 to 50 C 32 to 122 F Storage 20 to 70 C 4 to 158 F Over range The 3 lower order digits blank for gt 1999 counts Display Accuracy 0 1 of reading 2 counts Display Ambient Temperature Effect 0 02 per C 40 012 per typical Conversion Rate 2 5 per second CERTIFICATION Consult the factory for current information on the availability of agency e g Canadian Standards Association
27. nal and Black to the module s minus terminal Proper polarity must be observed For most applications it is recommended that the minus module input terminal be connected to an earth ground The connections between the AC Current Sensor would be floating if not grounded Grounding eliminates the risk of high common mode voltages from showing up on the wires and reduces noise pickup ACROMAG INCORPORATED 30765 South Wixom Road PO Box 437 Wixom MI 48393 7037 USA Tel 248 624 1541 FAX 248 624 9234 Copyright 1988 1994 Acromag Inc Printed in the USA Data and specifications are subject to change without notice 8500 239 B96L001 A ii B L D G H APPLICATION EXAMPLE A AC CURRENT TRANSFORMER C T AC CURRENT 5 AMPS FULL SCALE 4 TURNS CAUTION DO NOT CONNECT AC CURRENT _ AC CURRENT DIRECTLY SOURCE TO MODULE INPUT TERMINALS USER SUPPLIED AC CURRENT TRANSFORMER WIRE NUT MODULE Ns INPUT OPENS OR SHORTS CONNECTIONS MOUNTED IN POWER AREA Nore ogsicnacows MODULE LEADS IN CAUTION aie Aj INPUT Bm CONNECT MODULE TO AC FIGURE 1 ane NNECTIONS CURRENT SENSOR SENSOR 1 ONLY T SENSOR l MONTERN DANGER DO NOT CONNECT AC CURRENT TRANSFORMER C T CONNECTIONS AC CURRENT DIRECTL
28. nce Effect Less than 0 005 of output span change for a 100 ohm load change Output Ripple Less than 0 25 of the maximum output span Can be reduced to less than 0 1 by adding a 1uF capacitor across the load resistor Some loads such as E P and I P devices may require a 0 1uF capacitor to be inserted across the load Bandwidth 3dB at 2 Hz typical transmitter only Response Time For a step input the output reaches 98 of its transition in 300ms typical transmitter only Noise Rejection Common Mode Better than 130dB at 60 Hz typical 100 ohm unbalance transmitter only Normal Mode Not applicable RFI Resistance Less than 0 5 of output span effect with field strengths of up to 10V meter at frequencies of 27MHz 151MHz and 467MHz EMI Resistance Less than 0 25 of output span effect with switching solenoids or commutator motors Surge Withstand Capability SWC Input Output terminations rated per ANSI IEEE C37 90 1978 Unit is tested to standardized test waveform that is representative of surges high frequency transient electrical interference observed in actual installations Construction Basic Transmitter AC Current Sensor Epoxy dipped and baked Circuit Boards Military grade FR 4 epoxy glass circuit board Circuit Board Coating Fungus resistant acrylic conformal coat Terminals Compression type wire size 14 AWG maximum Mounting Position Position insensitive Case Self extin
29. nts and requires no maintenance except for periodic cleaning and calibration verification When a failure is suspected a convenient method for identifying a faulty transmitter is to exchange it with a known good unit Itis highly recommended that a non functioning transmitter be returned to Acromag for repair since Acromag used tested and burned in parts and in some cases parts that have been selected for characteristics beyond that specified by the manufacturer Further Acromag has automated test equipment that thoroughly checks the performance of each transmitter DC SUPPLY OPTIONAL 5 DIGIT GROUND O DVM CONTROL TYPICAL SERIES 250 PROCESS LOOP eoo TRANSMITTER ADJUSTMENTS REVERSE POLARY DVM TEST SIGNAL 40 200 ZERO SPAN HM ADJUST ADJUST gore 9 1 25ppm 4 29 LOW PASS SIGNAL OUTPUT FILTER AMPLIFIER AMPLIFIER SIGNAL OPTIONAL AC ISOLATION DISPLAY CURRENT SENSOR mA DC RECOMMENDED CURRENT CALIBRATION SETUP SOURCE DC INPUT CURRENT METHOD mA DC tac E SUPPLY INPUT SER SUPPLY POWER SEE DRAWING ISOLATION 4501 380 FOR MORE DETAIL SERIES 2591 SIMPLIFIED SCHEMATIC AC CURRENT SENSOR Se Basse INPUT CONNECTIONS TO THE TRANSMITTER WILL OCCUR wixow MICH ME SIMPLIFIED SCHEMATIC TYPICAL INST 5 rer 5 A Fs 0 1
30. o condition an AC current input signal and convert this signal to a 4 to 20mA process current output The sensor is designed to be field mounted near the AC current it is measuring and transmits a low level DC milliamp signal to the transmitter s input The sensor transmitter are each isolated between input and output Transmitter zero and span adjustments utilize 22 turn potentiometers accessible from the front of the unit This transmitter has various mounting and enclosure options available MODEL SERIES 250T Color Coded with a White Label INPUT Sensor and Transmitter AC Current Sensor 5020 350 One sensor is supplied with each Model 250T CACX transmitter The sensor is a highly accurate toroidal instrument transformer used to convert an AC current signal to a low level DC milliampere signal 0 to 11 17mA The input AC current range is a simple function of the number of turns placed on the AC Current Sensor see the table below The user configures the AC current sensor with the required number of primary turns to obtain the desired input span AC CURRENT INPUT RANGE PRIMARY TURNS SENSOR OUTPUT RED BLACK WIRES Oto 5Amps 0 to 11 17mA DC 0 to 11 17mA DC 0 to 11 17mA 0 to 11 17mA DC to 11 17mA DC 0 to 20 Amps AC 0 to 10 Amps AC Oto 2Amps AC Oto 1Amps AC The output wires on the sensor are polarized the Red wire is plus and Black wire is minus Normally
31. t the load by the transmitter The ripple at the load will be 0 01 of span per volt peak to peak of power supply ripple The unit may have up to 0 25 percent of internally generated ripple connect an external luf capacitor across the load to reduce this ripple to less than 0 1 percent if desired 2 Grounding The two wire transmitter is packaged in the General Purpose plastic Housing and does not require an earth ground connection If the transmitter is mounted a metal housing a ground wire connection is required to the housing Connect the ground terminal Green Screw to earth ground using suitable wire per applicable codes 3 Input The AC Current Sensor is isolated and can be used in AC circuits up to 250V AC 50 or 60 Hz It is designed to be mounted at the source of the AC current to be measured The sensor outputs a low level DC milliampere signal allowing the transmitter to be mounted remote from the AC signal using small gauge wires The sensor s output Red Black wires can be shorted open circuited or removed from the transmitter s input terminals without hazard to personnel or the AC Current Sensor A AC Current Sensor Per the Input Range chart in the Specifications Section loop the required number of turns through the toriod for the full scale range that you need in your application Use the cable tie provided to mechanically secure the sensor Refer to Drawing 4501 380 DANGER If the AC Current Sensor is use
32. urface Mounting Secure the transmitter to the designated mounting surface using two 6 32 screws Note that the mounting bracket has screw slots to facilitate mounting Units can be mounted side by side on 1 0 inch centers if required 3 SNAPTRACK Mounting Secure the SNAPTRACK mounting channel to the designated mounting surface using suitable fastening hardware To install the unit in the mounting channel place the bottom end of the mounting bracket between the rails and press the top notched end firmly until the bracket snaps into place To remove the transmitter insert a screwdriver into the upper arm of the connector and twist to release the unit from the track while tipping the unit out Units can be mounted side by side on 1 0 inch centers if required 4 NEMA 4 amp 12 Enclosure Mounting Secure the enclosure assembly to the designated mounting surface using appropriate hardware The transmitter is secured within this enclosure using two screws See Note Below 5 NEMA 4X and Explosion Proof Mounting Secure the enclosure assembly to the designated mounting position using appropriate hardware Note It is recommended that the transmitter be removed from the enclosure during the process of drilling holes installing fittings and mounting the enclosure To remove the unit from the enclosure remove two screws securing it to the bottom of the enclosure After the enclosure is installed install the transmitter into
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