- 1 - User`s Manual: Series 450T Potentiometer/Slidewire
Contents
1. User s Manual Series 450T Potentiometer Slidewire Input AC Powered Transmitters Table of Contents Page IATFOGUCTION uth Ns ee ates fests Mati 1 Description ees 1 aa LL 2 w o Sie ance an aA EE AAAA AA a 3 Calibration O hfC fO aa L 3 General Maintenance ss LLL 3 List of Drawings Page Electrical Connections Pot Slidewire Input 4501 419 4 Dimensions DIN Rail Mounting 4501 348 5 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 51 1 A94A000 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 450T2. Noise Rejection Common Mode Better than 130dB at 60 Hz typical 100 ohm unbalance Normal Mode 50 at 60Hz typical RFI Resistance Less than 0 5 of output span effect with RFI 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 a standardized test waveform that is representative of surges high frequency transient electrical interference observed in actual installations Construction 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 extinguishing NYLON Type 6 6 polyamide thermoplastic UL94 V 2 color black General Purpose NEMA Type 1 enclosure Series 450T User s Manual Potentiometer Slidewire Input MOUNTING DIN General Purpose Housing DIN Rail Mount G amp rails G Rail 832mm EN50035 Rail 35mm Type EN50022 Refer to Drawing 4501 348 for outline and clearance dimensions Shipping Weight 1 pound 0 45 Kg packed CERTIFICATION Consult the factory for current information on the availability of agency e g Canadian Standards Association Factory Mutual
3. etc approvals NCR No Certification Required INSTALLATION The transmitter is packaged in a general purpose enclosure Use an auxiliary enclosure to protect against unfavorable environments and locations Maximum operating ambient temperatures should be within 13 F to 185 F 25 C to 85 C for satisfactory performance Factory calibrated units are ready for installation Connect as shown in the connection Drawing 4501 419 If the unit is not factory calibrated refer to the CALIBRATION section Mounting Mount transmitter assembly refer to Drawing 4501 348 for mounting and clearance dimensions DIN Rail Mounting Use suitable fastening hardware to secure the DIN rail to the designated mounting surface A transmitter can be mounted to either the G Rail Installation of the transmitter to the rail depends on the type of DIN rail used see Drawing 4501 348 Units can be mounted side by side on 1 0 inch centers if required 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 recommend
4. is highly recommended that a non functioning transmitter be returned to Acromag for repair since Acromag makes use of 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 VOLTAGE 0 5 CURRENT OUTPUT 450T IMPLIFIED S POTENTIOMETER SLIDEWIRE INPUT NOTE 1 FOR PROCESS CURRENT OUTPUT UNITS Y A PRECISION 10 OHM RESISTOR IS PLACED IN SERIES WITH THE OUTPUT MAX TERMINAL 0 1 25ppm A DVM MAY CONNECTED BETWEEN THE OUTPUT S AND TERMINAL TO MONITOR THE LOOP CURRENT THUS A SOEWIRE Beer MEASUREMENT OF IS EQUIVALENT TO AND SERIES 45 T POTENTIOMETER For vue OUTPUT unre Cs OUT SLIDEWIRE INPUT 8 ELECTRICALLY EQUNALENT TO THE OUTPUT orpona L ELECTRICAL CONNECTIONS INPUT CONNECTIONS WIXOM MICH DATE Rev ecn 0A ME POTENTIOMETER SLIDEWIRE INPUT CONNECTIONS oF 1 RBS 4501 419 NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS WIRE INSERTION CLAMPS 12 PLACES G RAIL DIN MOUNTING T RAIL DIN MOUNTING SHOWN THIS SIDE SHOWN THIS SIDE XN DIN EN 50035 32mm DIN EN 5 022 35mm RAIL DIN MO
5. provides the user with a modular approach to the varied applications in the field Other 450T transmitters are available to condition DC voltage DC current thermocouples frequency RTD AC current and AC voltage inputs The Series 450T complements the Acromag Series 350T DC powered transmitters providing the same input conditioning for AC powered applications An entire family of Acromag flat pack DIN rail transmitters alarms and isolators are available providing a flexible and modular solution for a wide range of field applications Series 450T User s Manual Potentiometer Slidewire Input The 450T transmitter is EMI and RFI protected operates over a wide temperature range and features excellent temperature coefficients which minimize effects from harsh plant environments In addition the safe compact rugged and reliable design of this transmitter allow it to be used in control room or field locations Input wiring is inserted in the bottom of the unit while output and power wiring is inserted at 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 three way isolated AC powered transmitters condition a three wire potentiometer or slidewire input using constant voltage excitation and convert this signal to process current or voltage output Wide range zero and span adjustments ut
6. Input Output Power Mounting Certification Typical Model Number 450T P Y 1 DIN NCR Series Input_ Output_ Power_ Mtg Cert ssor P y 1 DIN NcR__ pot Approval Notes Table 1 1 Unit cannot be factory calibrated to customer s specifications no suffix required 2 Consult the factory for current information on agency e g Canadian Standards Association etc approvals DESCRIPTION The Series 450T is an AC powered DIN rail mounted transmitter family This model conditions a direct three wire potentiometer or slidewire input and converts the wiper rotation or position to a high level process current or voltage output The transmitter provides constant voltage excitation to the sensor and allows the use of potentiometers or slidewires with values from 100 ohms to 10K ohms Applications for this device include the manual control of valves position sensing for actuators level sensors and test equipment Three way isolation is provided between the input output and power The unit includes wide range zero and span adjustments Series 450T transmitters are available for 115V or 230V AC power for DC power applications see the Acromag Series 350T transmitter family The versatile DIN rail mount can accommodate a variety of mounting applications See Drawing 4501 419 for a simplified schematic The Series 450T transmitters are designed as another functional component that
7. UNTING SHOWN H DIN EN 50035 32mm RAIL DIN MOUNTING SHOWN HERE DIN EN 50022 35mm SCREWDRIVER SLOT FOR REMOVAL FROM 7 RAIL NOTE ADJACENT UNITS CAN BE MOUNTED ON 1 6 INCH 48mm CENTERS ENCLOSURE DIMENSIONS FOR DIN RAIL MOUNTING Acromag wikom MICH om pej SERIES 450T HOUSING DIN RAIL MOUNT fo asor 1 1 94501 48 NOTE ALL DIMENSIONS ARE IN INCHES MILUMETERS
8. ed that output and power wiring be separated from the signal wiring for safety as well as for low noise pickup 1 Power The label on the unit specifies the AC power requirements Connect AC power as shown in the Connection Drawing 4501 419 Use suitable wire per applicable codes For 115V AC units connect the AC HOT power lead to the L1 terminal and the AC NEUTRAL power lead to the terminal marked W For 230V AC units connect the AC L1 power lead to the L1 terminal and AC L2 power lead to the terminal marked L2 Connect the AC GROUND lead to the G terminal the AC Ground terminal is not connected internally 2 Grounding The transmitter housing is plastic and does not require an earth ground connection If the transmitter is mounted in a metal housing a ground wire connection is required Connect the ground terminal of the metal housing Green Screw to a suitable earth ground using appropriate wire per applicable codes 3 Output Connect output per Connection Drawing 4501 419 Load range is a function of the module s output type refer to Output in the preceding SPECIFICATIONS section The output is isolated from the input and power circuits 4 Input Connect input per Connection Drawing 4501 419 NOTE The input circuit is electrically isolated from the output and power circuits allowing the input to operate up to 250V AC or 354V DC off ground on a continuous basis CALIBRATION The calibration example below
9. ilize 22 turn pots accessible from the front of the unit Optional 115V AC or 230V AC power is available This transmitter is DIN rail mounted MODEL SERIES 450T Color coded with a white label INPUT P 100 ohm to 10 000 ohm three wire potentiometer or slidewire Excitation 0 175V DC nominal constant voltage current limited to 2 0mA nominal Adjustments Zero Adjustment 0 to 75 of slidewire resistance Span Adjustment 25 to 100 of slidewire resistance Isolation Three way isolation is provided between the input output and power circuits for common mode voltages 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 complies with test requirements outlined in ANSI ISA S82 01 1988 for the voltage rating specified OUTPUT Process Current or Voltage output Voltage outputs are designed to provide true voltage output with zero volts included and to be stable with capacitive loads Y 4to 20mA DC R Load 0 to 550 ohms 0 0 to 10V DC into 10 000 ohms or greater V5 0 to 5V DC into 5 000 ohms or greater NOTE For process current output Y units the loop current may be monitored by placing a DVM between the Output S and Output terminal This connection measures the current drop through a precision 10 ohm resistor placed in series with the Output terminal 0 1 25ppm Thus a DVM measurement of 40mV c
10. is used for reference only Calibration is essentially the same for units with other input spans Adjustment Procedure Connect transmitter as shown in Connection Drawing 4501 419 The unit should be calibrated using the actual slidewire or potentiometer used in the end system The output voltage or current must be measured to 0 05 accuracy or better for proper results The Zero and Span adjustments are accessible on the front panel of the transmitter see Drawing 4501 419 for their location The screwdriver blade used to adjust the potentiometers should not be more than 0 1 inch 2 54mm wide Transmitter Calibration Example MODEL 450T P Y 1 DIN NCR Input Slidewire 0 to 10K ohms Output 4 20mA DC Power 115V AC 1 Set the slidewire to its minimum position for your application Adjust the Zero Z pot until the output reads 4 000mA DC 2 Set the slidewire to its maximum position for your application Adjust the Span S pot until the output reads 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 GENERAL MAINTENANCE The transmitter contains solid state components 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 It
11. orresponds to 4mA 200mV corresponds to 20mA of loop current For voltage outputs Vx units the Output S terminal is electrically equivalent to the Output terminal Output Limiting Voltage units Vx 120 of full scale output nominal Current unit Y 125 of full scale output 24mA nominal Output Ripple Less than 0 1 of the maximum output span POWER 1 115V AC 10 50 60Hz 0 05A Y units 0 020A Vx units 2 230V AC 10 50 60Hz 0 025A Y units 0 010A Vx units Power Supply Effect Less than 0 05 of output span for rated supply variations Reference Test Conditions Input 100 ohm slidewire with a 100 ohm span Output Y units 4 20mA DC 500 ohm load Output Vx units 0 10V DC into 10K ohms or greater Ambient 77 F 25 C 115V AC supply Accuracy Better than 0 1 of calibrated span This error includes the combined effects of transmitter repeatability hysteresis terminal point linearity and adjustment resolution Does not include 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 Bandwidth at 2HZz typical Response Time For a step input the output reaches 98 of output span in 300ms typical
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