Introduction ISOLATED SIGNAL CONDITIONING can significantly increase

Transcription

1 Introduction ISOLATD SIGNAL CONDITIONING can significantly increase your system reliability here's how: Linearizes Thermocouple and RTD signals Reduces the demands on the software to linearize the signal Produces a voltage or current that is directly usable by a display device Provides sensor excitation for RTD s, strain gages and transmitters Simplifies system design and reduces parts and cost Increases reliability liminates ground loops More accurate data acquisition Shortens system start up time Isolates the field from the computer Protects operators Protects the data acquisition hardware and the computer Minimizes errors caused by common mode voltage Amplifies the low level sensor signal outside of the electrically noisy computer chassis Minimizes or eliminates errors caused by electro-magnetic interference Provides over-voltage protection Protects equipment and personnel from improper wiring, power surges and other faults Provides convenient screw terminals for field wiring Simplifies installation Reduces troubleshooting and repair time Filters out unwanted noise Reduces noise from AC power lines, florescent lights, motors, etc. Mixes and matches many sensor types on one backplane Minimizes initial outlay Facilitates future expansion Customizes the full range of the module to match the sensor signal range Maximizes the resolution and accuracy of the reading over small signal spans Whether your analog application calls for maximum flexibility, low cost, or high performance, you ll find it in the WRC s broad line of analog signal conditioners. ach offers a unique signal conditioning solution. The B Series is optimized for use in the process control industry. Features including redundant 2 V dc power, and 1 V rms isolation facilitate system design. High channel density applications are easily accommodated by the small size of the 7B Series module. Flexibility is a keynote of the 7B series these signal conditioners are the system designer s drop-in solution for interfacing to real-world signals. The WRC7 Series provides low-cost, low-isolation signal conditioning using the same pin-out and foot-print as the B Series. Modules operate from regulated 2Vdc power supplies and provide nominal 6 V isolation. Functional Block Diagram of a typical measurement and control loop using signal conditioning subsystems. SNSOR OR TRANSMITTR PROCSS ACTUATOR (xample: valve) mv, V, Thermocouple, Strain Gage, RTD, Frequency, LVDT, -2 ma, AD9 INPUT MODUL Input Input modules modules accept accept real world real world analog analog inputs inputs and provide two high and provide high level analog level analog outputs outputs SYSTM INTRFAC (xample: SmartMux) The RTI Series) PC, MICRO- PLC, DCS, or MICRO- PUTR PUTR 2-2 ma, ma 2 ±1 ma V 1 V OUTPUT MODUL Output modules accept high level voltage inputs and provide process current or voltage outputs phone: fax: sales@wrcakron.com 1

2 1781-7B Series B Series Input and Output Modules Features Accepts most process control input signals Powered current input provides 2 V for a transmitter Analog current output module Complete signal conditioning function: 12 V rms field wiring protection, filtering, amplification, 1 V rms galvanic isolation Pin compatible to industry standard solid-state relays Operates from 2 V dc (1 V dc to V dc) power Factory-calibrated accuracy to ±.1% Mix-and-match modularity B Series Input and Output Modules The B Series represents Western Reserve Control s ongoing commitment to provide cost-effective, isolation-based signal conditioning solutions for the process control industries. The B Series is a family of modular, singlechannel, plug-in signal conditioning modules that accept inputs from a wide range of process control transducers and signals while providing high-level output voltages or process control currents. Performance Optimized for Featuring a maximum nonlinearity of ±.2% and factory calibration that guarantees an initial accuracy specification of ±.1%, the B Series offers superior performance at a lower cost than existing multipurpose signal conditioners or in-house designs. Other family features include 16 db of commonmode rejection, 6 db of normal-mode rejection, up to 1 V rms of isolation, and 12 V rms of field wiring protection. Short circuit and input overvoltage protection are built-in and the proprietary isolation transformer circuit design of the B Series provides for true channel-to-channel isolation. C Approval uropean C approvals MC directive compliant. Low voltage directive is not applicable. Products comply with NG11-1 (IC11.) Rated to Operate in the Industrial nvironment All B Series modules are packaged in compact, rugged, 2.1" x 1.7" x.6" ( mm x 2 mm x 1 mm) plastic cases that readily accommodate high channel density applications. The modules are rated over the extended - C to 8 C industrial temperature range; and they may be operated in noncondensing, high humidity environments B Series modules can be removed and/or inserted into the backplane without damage to the modules when the power supplies are energized. Unregulated 2 V dc Linear Power Supplies The B Series is rated for a nominal power supply input of 2 V dc; and, for maximum flexibility, it will accept supply voltages in the 1 V dc to phone: fax: sales@wrcakron.com 2

3 1781-7B Series V dc range. Consequently, system performance will not degrade with the use of unregulated supplies. Linear supplies are recommended for better noise rejection. Redundant power supply configurations are available. Hardware The B Series is complemented by a full line of backplanes (1, -, 8-, 16- channel) and rackmount hardware. ach backplane contains screw terminals for field wiring connections, and a miniature cold junction compensation thermistor is installed under the screw terminal blocks for each channel. The B Series simplified pinout ensures that this thermistor compensates the input signals for the thermocouple modules only. Consequently, any module type may be used in any channel on the backplane. Model Sensor Type B21 dc V input B22 dc V output B dc mv/v input B1 dc V input B2 dc ma input B dc V input B/N 1 Ω platinum or nickle RTD B dc ma with loop power: two-wire transmitter B7 Isolated J, K, T,, R, S, B, N thermocouple B9 dc ma output B7 Isolated J, K, T,, R, S, B thermocouple B Series Accuracy ±.1% Power Supply Requirements Configurability FM Approval Field Wiring Protection Isolation Voltage Common-Mode or 6Hz Normal-Mode or 6Hz Backplanes Rated Temperature Range Gain Adjustment Offset Adjustment Package Size Packaging Style Special Features Short Circuit Protection (Voltage Outputs) 1 V dc to V dc Factory Configured and Trimmed No Up to 12 V rms, continuous 1 V rms 12 db or better ( Hz modules only) 6 db 1,, 8, and 16 channel with built-in CJC sensor C to 8 C None Available to the User None Available to the User 1.66" x 2.11" x.6" (2.2mm x.6mm x 1.mm) Module Simple pinout, compact package Continuous short to ground phone: fax: sales@wrcakron.com

4 1781-7B Series B21 Isolated Analog Input Modules Module Input Range B21 ±1 V Input Resistance - Normal 2 MΩ minimum Bandwidth, - db Hz B Isolated Analog Input Modules Module Input Range B-1 to 1 mv B-2 to 1 mv B- to 1 V B- 1 to V B-6 ±1 mv B-7 ±1 mv B-8 ± 1 V Input Resistance - Normal MΩ minimum Bandwidth, - db Hz B1 Isolated Analog Input Modules Module Input Range B1-1 to 1 V B1-2 ± V B1- ±1 V B1- to V Input Resistance - Normal kω minimum Bandwidth, - db Hz V IN R T * 2 Surge Suppression and Protection NC R T is a backpanel option for current to voltage voltage conversion conversion using using either either WRC Dataforth P/N (2Ω) P/N *R T is a backpanel option for current to V V or a SCM7BR1 user-provided (2Ω) resistor a user provided resistor. 1 (1 pole) Iso-Chopper II ( pole) / Common Specifications Accuracy ±.1% span max., ±.% span typical Supply Voltage 1 to Vdc Current ma maximum Output Ranges Available Range Part # modifier xample to 1 V none B-1 1 to V D B-1D Includes the effects of repeatability, hysterisis and linearity Output range and supply current specifications are based on minimum output load resistance. Minimum output load resistance is calculated by V OUT2 /P where P is the Output ffective Available Power that guarantees output range, accuracy and linearity specifications. V OUT (1-V dc) B22 Isolated Output (bipolar) Module Input Range Output Range B22 ± 1 V ±1 V Output Resistance <1 Ω Input Resistance 2 MΩ minimum Accuracy* ±.1% span max. ±.% span typical Bandwidth, - db Hz Supply Voltage 19 to 29 Vdc Current** ma maximum * Includes the effects of repeatability, hysterisis and linearity ** Output range and supply current specifications are based on minimum output load resistance. Minimum output load resistance is calculated by V OUT2 /P where P is the Output ffective Available Power that guarantees output range, accuracy and linearity specifications. V IN /I IN R T * 2 NC Surge Suppression and Protection R *R T is a backpanel option for current to voltage T is a backpanel option for current to voltage conversion using either Dataforth WRC P/N P/N (2Ω, SCM7BR1.1%) (2Ω, or a user-provided.1%) or a resistor. provided resistor. **R R INT is the SCM7B2 only. INT is installed internal to the B2 only. 1 R INT ** (1 pole) V V Iso-Chopper II ( pole) / V OUT (1-V dc) phone: fax: sales@wrcakron.com

5 1781-7B Series B2 Process Current Input Module Input Range B2-1 to 2 ma B2-2 to 2 ma Input Resistance - Normal <1 Ω B Process Voltage Input Module Input Range B-1 1 to V B-2 to V Output Ranges Available Range Part # modifier xample to 1 V none B-1 1 to V D B-1D Input Resistance - Normal 2 MΩ I LOAD 1 Iso-Chopper II Surge Input Input Suppression (2 (2 pole) Protection/ Protection (1 (1 pole) Protection. and Conversion 2 (2 (2 pole) NC Common Specifications Accuracy* ±.1% span max., ±.% span typical Bandwidth, - db 1 Hz Supply Voltage 1 to Vdc Current** ma maximum V V / * Includes the effects of repeatability, hysterisis and linearity ** Output range and supply current specifications are based on minimum output load resistance. Minimum output load resistance is calculated by V OUT2 /P where P is the Output ffective Available Power that guarantees output range, accuracy and linearity specifications. V IN IN, I IN (19-29V (1-V dc) B/N RTD Input Modules Module Input Accuracy* Non-** Range conformity 1Ω Pt (alpha =.8) B-1 ±1 C ±.1% ±.% B-2 to 1 C ±.2% ±.% B- to 2 C ±.1% ±.% B- to 1 C ±.1% ±.% B- - C to C ±.1% ±.% 1Ω Ni (alpha =.672) B-1N to C ±.% ±.12% B-2N to 2 C ±.% ±.1% Lead Resistance ffect Sensor xcitation Current Bandwidth, - db Supply Voltage Current ±.2 C/Ω 2 µa Hx 1 to Vdc ma maximum Output Ranges Available Range Part # modifier xample to 1 V none B-1 1 to V D B-1D RTD Shield* NOT: For 2-wire operation, jumper the () and (x) connections on the backpanel term block. * Shield ground-tie shown for ungrounded RTD sensor configuration. 1 Surge Suppression, Protection, Lead Compensation, 2 (1 pole), and RTD Current Stimulus Linearization V V Iso-Chopper II * Includes the effects of repeatability, hysterisis and conformity. Accuracy is given as a maximum. The typical value is half the maximum. ** Nonconformity is calculated using the best-fit stright-line method. Nonconformity is given as a maximum. The typical value is half the maximum. Output range and supply current specifications are based on minimum output load resistance. Minimum output load resistance is calculated by V OUT2 /P where P is the Output ffective Available Power that guarantees output range, accuracy and linearity specifications. ( pole) / V OUT (1-V dc) phone: fax: sales@wrcakron.com

6 1781-7B Series B Transmitter Input Modules (2-Wire with Loop Power and Sense Resistor) Module Input Range Output Range B-1D to 2 ma 1 to V B-1 to 2 ma to 1 V Loop Voltage 2 Vdc* Bandwidth, - db 1 Hz Supply Voltage 18 to Vdc Current** 7 ma Output Ranges Available Range Part # modifier xample to 1 V none B-1 1 to V D B-1D 2-wire Transmitter Surge 1 Suppression, Protection 2 Surge Suppression, Protection NC V loop V V V loop & I-V Loop Supply Iso-Chopper II ( pole) / * 2 Vdc will be supplied to the loop for an open loop condition. Approximately 22 V to 16 V will be supplied for a corresponding MA to v2 ma input. Loop voltage is independant of supply voltage. ** Output range and supply current specifications are based on minimum output load resistance. Minimum output load resistance is calculated by V OUT2 /P where P is the Output ffective Available Power that guarantees output range, accuracy and linearity specifications. V OUT (18-V dc) B7 Thermocouple Input Modules Model Number InputRange B7-J-1-1 C to 76 C B7-J-1 C to 2 C B7-J-11 C to C B7-J-12 C to 6 C Thermocouple B7-J-1 C to 6 C B7-K-2-1 C to 1 C B7-K-2 C to C B7-K-21 C to 6 C B7-K-22 C to 12 C B7-K-2 C to 18 C B7-T- -1 C to C B7-- C to 9 C B7-R- C to 17 C B7-S-6 C to 17 C B7-B-7-1 C to 18 C Input Resistance - normal MΩ Accuracy* ±.1% span max, ±.% span typical Open Input Response Upscale Open Input Detection Time 1 s maximum Bandwidth, -db Hz Supply Voltage 1 to Vdc Current** ma maximum Shield** R T * *R T is a backpanel mounted NTC thermistor used as a cold junction compensation (CJC) sense element. **Shield ground-tie shown for ungrounded thermocouple configuration. 1 2 Surge Suppression, Protection, (1 pole), Open Detection and CJC V V Iso-Chopper II Output Ranges Available Range Part # modifier xample to 1 V none B-1 1 to V D B-1D ( pole) / V OUT (1-V dc) phone: fax: sales@wrcakron.com 6

7 1781-7B Series B9 Process Current Output Module Input Range Output Range B9-2 to 1 V to 2 ma B9-2D 1 to V to 2 ma B9-1 to 1 V -2 ma Output ffective Available Power 2 mw Output Current Limit 2 ma Accuracy *(see -7B7) ±.1% span max. ±.% span typical Bandwidth, - db 1 Hz Supply Voltage 18 to Vdc Current **(see -7B7) 7 ma maximum I LOAD 1 Iso-Chopper II Input (2 pole) (1 pole) 2 Surge Suppression Protection. and (2 pole) NC V V Protection/ Conversion / V IN, I IN (1-V dc) B7 Linearized Thermocouple Input Module Input Range Accuracy B7-J-1 C to 76 C ±.2% span B7-J-2-1 C to C ±.% span B7-K- C to 1 C ±.2% span B7-K- C to 6 C ±.18% span B7-T- C to C ±.8% span B7-T-6-1 C to 2 C ±.7% span B7--7 C to 9 C ±.% span B7-R-8 C to 17 C ±.% span B7-S-9 7 C to 17 C ±.2% span B7-B-1 8 C to 18 C ±.% span B7-N-11 2 C to 1 C ±.27% span Input Resistance - normal MΩ Accuracy* ±.1% span max, ±.% span typical Open Input Response Upscale Open Input Detection Time 1 s maximum Bandwidth, -db Hz Supply Voltage 1 to Vdc Current** ma maximum Thermocouple Shield** R T * *R T is a backpanel mounted NTC thermistor used as a cold junction compensation (CJC) sense element. **Shield ground-tie shown for ungrounded thermocouple configuration. 1 2 Surge Suppression, Protection, (1 pole), Open Detection and CJC V V Iso-Chopper II Output Ranges Available Range Part # modifier xample to 1 V none B-1 1 to V D B-1D ( pole) and Linearization / * Includes the effects of repeatability, hysterisis and linearity ** Output range and supply current specifications are based on minimum output load resistance. Minimum output load resistance is calculated by V OUT2 /P where P is the Output ffective Available Power that guarantees output range, accuracy and linearity specifications. V OUT (1-V dc) phone: fax: sales@wrcakron.com 7

8 Low-Cost WRC7 Series WRC s SmartMux, SmartMux-Lite, SmartMux-Plus and SmartPMux remote adapters all use B and/or WRC7 series of analog I/O modules for signal conditioning. The B modules provide cold-junction compensation; filtering; provide isolated sense currents; isolation; and amplification of the field signal to a standard -1 Vdc logic signal. Many applications do not require all of these features, especially point-to-point isolation. WRC7 Series of analog signal conditioning modules provide differential, signal conditioning in a manner which is compatible with WRC s SmartMux and SmartMux-Lite, SmartMux-Plus and SmartPMux. WRC7-9 Common Specifications: Package:.6 x 1.7 x 1.2 blue module case Pin-out: per standard/slim modules Power: 2Vdc /- 1% Isolation: when used with WRC SmartMux products, 6 V channel to channel; 1 V channel to network Common Mode Rejection: 12 db or better Normal Mode Rejection: 6 db Accuracy:.2% Logic side signal: - 1 Vdc Bandwidth: >2 KHz WRC7 SRIS WRC7 V DC Model Current WRC7-2 ma WRC7-1 2 ma WRC7-2 2 ma ma ma WRC7-6 2 ma WRC7-9 ma WRC7-9: ma Output Module WRC ma WRC ma Output Module WRC7-9-1 WRC7-9-2 Output Configuration 2 wire (&-) 2 wire (&-) Output Current Range - 2 ma - 2 ma ***Output Protection 12 VAC 12 VAC Output Power Avail. mw mw **Output Accuracy /-.2% /-.2% **Non-Linearity /-.2% /-.2% **Stability 1 ppm/c 1 ppm/c Output Compliance 1 V 1 V Voltage Limit Input Voltage Range to 1 V to 1 V Input Resistance >1 MΩ >1 MΩ * 2C ** (of Span) *** Hi to Lo: V Lo to GND phone: fax: sales@wrcakron.com 8

9 WRC7-/1: Voltage Input Module WRC mv WRC V WRC V WRC V WRC V WRC7--8 /- 1 V WRC7-1-2 /- V WRC7-1- /- 1 V WRC7-2: ma Input Module for externally powered field transmitters WRC ma WRC ma Input Module WRC7- WRC7-1 WRC7-2 Input Configuration 2 wire (&-) 2 wire (&-) 2 wire (&-) Input Resistance Normal 1M Ω 1M Ω 2 Ω Power Off 1M Ω 1M Ω 2 Ω Overload 1M Ω 1M Ω 2 Ω Input Protection Normal Mode 12 Vrms 12 Vrms ma Common Mode 12 Vrms 12 Vrms 12 Vrms Output Voltage Range to 1 V to 1 V to 1 V Output Resistance <1 Ω <1 Ω <1 Ω Output Protection Cont. Short Cont. Short Cont. Short Output Current Limit 1mA 1 ma 1 ma **Accuracy /-.2% /-.2% /-.2% ** Non-Linearity /-.2% /-.2% /-.2% ** Stability 1 ppm/c 1 ppm/c 1 ppm/c Frequency Response Hz Hz Hz * 2C ** (of Span) *** Hi to Lo: V Lo to GND WRC7-167: -1 V Input or Output Module (pass through with signal clamping) phone: fax: sales@wrcakron.com 9

10 Sourcing Input Module WRC7- WRC7-6 WRC7-7 Input Resistance 1 MΩ 1 MΩ 1 MΩ xcitation Current Input.2 ma.2 ma.2 ma -Input.2 ma.2 ma.2 ma Lead resistance effect qual Resistance.1 Ω/Ω.1 Ω/Ω.1 Ω/Ω &- Lead Unequal Resistance 1 Ω/Ω of DR 1 Ω/Ω of DR 1 Ω/Ω of DR &- Lead Lead Resistance.2 Ω/Ω.2 Ω/Ω.2 Ω/Ω Maximum Lead 1 Ω 1 Ω 1 Ω Resistance (Total) Input protection to ground 1/8A Fuse 1/8A Fuse 1/8A Fuse Normal Mode ( to -) 12 VAC 12 VAC 12 VAC Common Mode(&- to ) 12 VAC 12 VAC 12 VAC **Accuracy /-.2% /-.2% /-.2% **Non-Linearity /-.2% /-.2% /-.2% **Stability 1 ppm/c 1 ppm/c 1 ppm/c Frequency Response Hz Hz Hz Output Voltage Range to 1V to 1V to 1V Output Resistance <1 Ω <1 Ω <1 Ω Output Protection Cont. Short Cont. Short Cont. Short Output Current Limit 1 ma 1 ma 1 ma WRC7-: RTD Input Module WRC7--1 ±1 C Pt WRC C Pt WRC C Pt WRC C Pt WRC7--N-1 - C Ni WRC7--C-1-12 C Cu WRC7-6: Potentiometer Input Module WRC Ω WRC Ω WRC KΩ WRC KΩ WRC ma WRC7-7-1: Thermister Input Module 1K ohm NI * 2C ** (of Span) *** Hi to Lo: V Lo to GND phone: fax: sales@wrcakron.com 1

11 1782-7BAS BAS mounting board accepts one B or WRC7 compatible module in a convenient DIN-rail mount package. A temperature sensor is mounted on board to provide cold junction compensation for thermocouple modules. Field connections are terminated with screw terminals. Logic side connections are terminated with screw terminations. MOUNTING DIMNSIONS. SCHMATIC DIAGRAM phone: fax: sales@wrcakron.com 11

12 1781-7B & B The Panel-Mount B and DIN-Rail Mount B are -channel backplanes for use with the B Series, WRC7 Series or compatible signal conditioner line. Both backplanes are powered by a user supplied 2 V dc power supply with primary and secondary recepticles for uninterrupted operation. One 2-pin D-type connector provides a connection to the logic side of the B. Field-side terminations are achieved with screw terminations. For the B, /" standoffs are provided for panel mounting. DIN-rail mounting is provided for the B. The B Mounting Board is fuse protected through F1. If the input supply voltage connection is reversed, diode DI will be forward biased to protect the modules. Provision is available for a user-provided, second, 2-pin, D-type connector. MOUNTING DIMNSIONS B B SCHMATIC DIAGRAM Note: P2 provided by user phone: fax: sales@wrcakron.com 12

13 1781-7B8 & B8 The panel-mount B8 and DIN-rail mount B8 are 8-channel backplanes for use with the B, WRC7, or compatible module line. Both backplanes are powered by a user supplied 2 V dc power supply with primary and secondary recepticles for uninterrupted operation. One 2-pin D-type connector provides a connection to the logic side of the B8. Field-side terminations are achieved with screw terminations. For the B8, /" standoffs are provided for panel mounting. DIN-rail mounting is provided for the B8. The B8 Mounting Board is fuse protected through F1. If the input supply voltage connection is reversed, diode DI will protect the modules. Provision is available for a user-provided second 2-pin D-type connector. MOUNTING DIMNSIONS B B8 SCHMATIC DIAGRAM Note: P2 provided by user phone: fax: sales@wrcakron.com 1

14 1781-7B16 The B16 is a 16-channel panel-mount backplane for use with the B, WRC7, or compatible module line. The B16 is powered by a user supplied 2 V dc power supply with primary and secondary recepticles for uninterrupted operation. One 2-pin D-type connector provides a connection to the logic side of the B16. Field side terminations are achieved with screw terminations. /" standoffs are provided for panel mounting. DIN-Rail Mounting is not available. The B16 Mounting Board is fuse protected through F1. If the input supply voltage connection is reversed, diode DI will protect the modules. Provision is available for a user-provided, second, 2-pin, D-type connector. MOUNTING DIMNSIONS SCHMATIC DIAGRAM Note: P2 provided by user phone: fax: sales@wrcakron.com 1

15 1781-STB-TC The 1781-STB-TC is a special analog termination board for use only with 1781-JxA SmartMux adapters. The 1781-STB-TC provides a low-cost means to provide 1 thermocouple measurements of the same type and range with a SmartMux. The 1781-STB-TC electrically looks like a 1781-B16 analog input mounting rack to the SmartMux, but it is dedicated to use with a single thermocouple type and range. Applications should be limited to those where isolation between thermocouples is not required. For those applications requiring multiple thermocouple types or isolation between thermocouples, consider the 1781-B or B series of input modules. The 16th. thermocouple input channel is dedicated for cold junction compensation. APPLYING MOUNTING BOARD Number of Channels 1 differential thermocouples Plus one input for CJC Input Voltage Range /-V, /-1 mv, /- mv, /-2 mv, /- 1 mv, /- mv Input Over-voltage Protection /- V Input Resistance 1 Gig Ohm Gain Accuracy /-.% Input Offset /- 1 micro-volt Output Offset /- 2. milli-volts CJC Accuracy /- 1 degree C Low Pass Filter Frequency 8 Hz, removable by customer Common Mode Rejection 1 db Power Requirements 2 ma Physical Dimensions 8.2" x 6.8" x 1.97" (2.9 cm x cm x. cm) Operating Temperature Range to 6 degree C 1781-STB-TC phone: fax: sales@wrcakron.com 1