Related Manuals for Omega DRA-RTM-8
Summary of Contents for Omega DRA-RTM-8
- Page 1 User’s Guide http://www.omega.com e-mail: info@omega.com DRA-RTM-8 ANALOG MULTIPLEXER...
- Page 2 OMEGAnet http://www.omega.com USA: One Omega Drive, Box 4047 ISO 9001 Certified Stamford, CT 06907-0047 Tel: (203) 359-1660 FAX: (203) 359-7700 e-mail: info@omega.com USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGASM Customer Service: 1-800-622-2378 / 1-800-622-BESTSM Engineering Service: 1-800-872-9436 / 1-800-USA-WHENS M TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA Mexico and Latin America:...
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Page 3: Table Of Contents
Contents 1. GENERAL DESCRIPTION 2. MOUNTING INSTRUCTIONS 3. REPLACING FUSES 4. ASSEMBLY 5. CURRENT INPUTS 6. CONNECTING TRANSMITTERS TO THE MULTIPLEXER 7. CONNECTING Pt-100 TO THE MULTIPLEXER 8. CONNECTING THE MULTIPLEXER TO A PLC 9. CONTROL 9.1 Enable 9.2 Address 9.3 Address Polarity 9.4 Control Tables 10. -
Page 4: General Description
1. GENERAL DESCRIPTION The DRA-RTM-8 is a multiplexer for 16 analog inputs - eight of which, marked 1-8, are direct inputs for Pt-100 sensors, while the remaining (9-16), are for 4- 20mA current loops. The DRA-RTM-8 output format is a 4-20mA current loop, with a 28mA limitation. -
Page 5: Current Inputs
Insert the two printed cards into their slots. Connect the flat cable between them. Connect the front panel flat cables. The panel must be inserted into the grooves on both sides of the case while pressing down until a distinct "click" is heard. Assembly is completed by laying the terminal strips in place. -
Page 6: Connecting Pt-100 To The Multiplexer
The unit is enabled when a logical "1" (5V < E < 60V) is connected to the E Terminal. In a disabled state, the DRA-RTM-8 outputs no current and reflects a Hi-Z state. This feature allows the connection of several DRA-RTM-8 units by tying their outputs and control in parallel and addressing them by controlling the individual Enable terminals. -
Page 7: Address
9.2 ADDRESS The required channel is selected by four address lines. The operating voltages are: Logical "1" 5V < Vi < 60V Logical "0" 0V < Vi< 0.5V 9.3 ADDRESS POLARITY (see fig 6) Address polarity is controlled by three internal pins and a jumper over two of them, located on PN 7021 printed circuit board, accessible behind the Enable terminal. -
Page 8: Calibration
It is not recommended to alter these calibration potentiometers. 10. CALIBRATION To calibrate the DRA-RTM-8, the limits must be defined. Tmin is the temperature at which the output current is 4mA. Tmax is the temperature at which the output current is 20mA. -
Page 9: Calibration Tables
i. Change the address to the next channel to be calibrated. j. Repeat steps b to h * The calibrator is set according to DIN 43760 Pt-100 table (a = 0.00385) 10.2 CALIBRATION TABLES Note: Logic state of "0" is when the DIP switch lever is down. 10.2.1 "ZERO"... -
Page 10: Multidrop Configuration
In the disabled state (E=0), the multiplexer outputs no current and exhibits a high Z state. This mode allows the connection of several DRA-RTM-8 units to one PLC's analog input, by tying their output terminals and the address lines in parallel, and applying individual Enable lines to select the desired multiplexer by disabling all but one (see fig 7). - Page 11 WARRANTY/DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OMEGA Warranty adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product.
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