Instruction/ maintenance manual of the product DRA-DCC-8 Omega
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DRA-DCC-8 DIGIT AL TO 8 CURRENT LOOP CONVERTER User’s Guide http://www .omega.com e-mail: info@omega.com.
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C o n t e n t s 1. MOUNTING INSTRUCTIONS 2. REPLACING FUSES 3. ASSEMBL Y 4. SUPPL Y VOL T AGE 5. MODES OF OPERA TION 5.1 0-20 or 4-20mA output current selection 5.2 Switch Settings 6. P ARALLEL CONTROL MODE 6.1 PLC Inter face 6.2 The "E" (ENABLE) T erminal 7.
1. MOUNTING INSTRUCTIONS 2 The DRA-DCC-8 is designed for standard DIN rail mounting. Place the unit on the upper par t of the mounting rail with the fastening tab facing down. Using a suitable flat screwdriver loosen the tab slightly and attach the unit to the rail.
3 The DRA-DCC-8 is powered by a DC power supply at a range of 15-32Vdc. In order to determine the minimum supply voltage, use the following equation: Vmin = 8 + Rload( Ω ) * 0.02 where: Vmin is the minimum required supply voltage. Rload( Ω ) is the maximum output load including the leads resistance.
4 Figure 2. SW5 MSB Self T est Mode * according to para #5.2 6. P ARALLEL CONTROL MODE * according to para #5.2 In the parallel control mode, the DRA-DCC-8 unit is controlled via a 15 bit bus. Three Address bits (A0-A3) select the proper current output channel and 12 Data bits (D0-D11) determine its value (A0 and D0 are MSB).
5 6.2 THE "E" (ENABLE) TERMINAL For E="1" the unit is enabled, which means that all input vectors are received and the output is updated. When E="0" the unit ignores any new input vector . The E terminal is recommended to be used as a strobe for parallel data which has a long setup time.
6 7.4.1 BAUD RA TE SELECT SW1 and SW2 select one out of four available baud rates. 300 BPS 4800 BPS 9600 BPS 19200 BPS OFF SW1 SW2 OFF ON OFF OFF ON ON ON 7.4.2 ID CODE Up to eight DRA-DCC-8s can be connected in a multidrop configuration. Switches SW3, SW4, and SW5 (MSB) set the ID code.
7 Note: If the value is omitted it will be treated as zero. Separators such as blanks or commas are not allowed. Example: Channel 4 in DRA-DCC-8 no. 7 has to receive the value of 981.
8 8.1 SELF TEST #1 (Communication Por ts T est) In order to test the serial communication por ts, this test mode converts the unit to a transponder for ASCII characters. Any transmitted character will be echoed to the host terminal. The host parameters should be set to: Baud rate : 4800, W ord length: 8 bits, Parity: even, Stop bit: 1 8.
9 11. DRA-DCC-8 CALIBRA TION Generally there is no need to calibrate the DRA-DCC-8 unit. However if calibration is required, the following steps should be carried out: T wo potentiometer trimmers, one for "Zero" and the other for "Span" are located on printed card 7040.
10 INPUTS: P ARALLEL INPUTS LOGIC LEVELS: DA T A HOLD TIME: MAXIMUM P ARALLEL INPUT RA TE: SERIAL COMMUNICA TION BAUD RA TES: P ARITY : STOP BIT : ST A TUS REPORT : MUL TIDROP CAP ABILITY : OUTPUTS: O.
RETURN REQUESTS / INQUIRIES Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBT AIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SER VICE DEP ARTMENT (IN ORDER TO A VOID PROCESSING DELA YS).
Where Do I Find Ever ything I Need for Pr ocess Measurement and Control? OMEGA…Of Course! TEMPERA TURE ⻬ Thermocouple, R TD & Thermistor Probes, Connectors, Panels & Assemblies ⻬ W ire: .
An important point after buying a device Omega DRA-DCC-8 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Omega DRA-DCC-8 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Omega DRA-DCC-8 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Omega DRA-DCC-8 you will learn all the available features of the product, as well as information on its operation. The information that you get Omega DRA-DCC-8 will certainly help you make a decision on the purchase.
If you already are a holder of Omega DRA-DCC-8, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Omega DRA-DCC-8.
However, one of the most important roles played by the user manual is to help in solving problems with Omega DRA-DCC-8. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Omega DRA-DCC-8 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
