User’s Guide Shop online at www.omega.com e-mail: info@omega.
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TABLE OF CONTENTS QUICK SET-UP GUIDE ..................................................................................................... ii SPECIFICATIONS ............................................................................................................. 1 HOW TO MOUNT THE UNIT ............................................................................................. 2 WIRING ......................................................................................................................
QUICK SET-UP GUIDE 1) Determine what function the panel meter is to perform, e.g., rate display with alarm, batch control, totalizer, etc. 2) Ensure compatibility with sensor. The DPF70 panel meters require a pulse (or contact closure) input. The pulse must exceed 3 VDC and drop below 1 VDC. If necessary, as in the case of paddle wheel, turbine meter or other types of inductive pick-up sensors, a signal conditioner or pulse amplifier (such as FLSC-AMP) can be used.
COUNTER STEP 2: DPF75, DPF76: A,) B.) C.) D.) Reset to zero "rST 0" will allow us to count up. "SET Pr" counts down from the preset value. To read the total in whole gallons, set the decimal point to the far right. Since you do not want to sum or take the difference of two inputs, choose "A SEP B" (DPF75 only). The frequency will exceed 40 Hz, so you will need to select "HI CPS". "LO CPS" provides debounce filtering for contact closures. RATE STEP 3: DPF75, DPF78 A.) B.) C.) D.) E.
DESCRIPTION & SPECIFICATIONS DESCRIPTION: The OMEGA DPF70 is a dual input (channel A and B) counter/ ratemeter, each with its own 5 digit dividing scale factor. The two 5 AMP preset relay outputs can be programmed by the user to apply to the "A" total counter, the "A" ratemeter, or the "B" counter or the net total of A and B inputs. The user can view the Net Total of "A+B", the Net Total of "A-B", the rate of A, or A and B counters separately. The "DPF75" version shows rate and total (as described above).
HOW TO MOUNT THE UNIT The unit is designed to be mounted with a gasket providing a water tight seal. Two mounting brackets are provided to secure the unit to the panel. A panel less than .1" may distort if the clamps are screwed too tightly. Slide the body of the unit through the rubber gasket. Insert the unit into the panel. As shown in "FIG. A", slide the brackets up the groove to press against the back of the panel. Insert screws into rear of brackets and tighten them evenly and alternately.
WIRING The rear terminal contains 12 screw terminals for connecting #14 to #28 gauge wire. The unit is controlled by a microprocessor and, therefore, an electrically "noisy" environment could cause operating problems. The input power line should not be common to power lines for motors, pumps, contactors, etc. The unit is designed to be immune from line or RF voltage interference. In some environments voltage spikes of over 100 volts, even 1000 volts, can occur.
CONNECTING AC / DC POWER NOTE: Connect power only after other connections are finished. Do not touch the live AC power terminals! The unit has been designed with an isolated AC input. Thus, polarity is not a concern for the AC input. The chassis is plastic, therefore earth ground is not used. For D.C. operation, connect + 12V to pin 7 and - D.C. to pin 8.
WHAT CAN YOU VIEW? 1) "A sub B" - If you have selected the "A sub B" mode, pressing "view" shows: A) The net result of subtracting input B from input A. Pulses on input B will subtract (count down). Pulses on input A will add (count up) if "reset to 0" is selected, if "set to preset" is selected, input A will subtract (count down). B) The rate of input A. 2) "A add B" - If you have selected "A add B" mode, pressing "view" shows: A) The net result of adding "A" and "B" inputs.
OPERATING THE FRONT PANEL RST Press to ENTER in the programming mode. Press to RESET displayed total in operating mode. Press to "enter" LOCK code to LOCK and UNLOCK front panel. Press to view or change Preset A E D C B A ENTER LOCK PRE A PRE B VIEW PRGM Press to view or change Preset B Press to alternately view A Rate& Net Total or A Rate, A Total & B Total. Use keys A, B, C, D, & E to advance digits during a numeric entry sequence.
PROGRAM CODES AND DESCRIPTIONS The following is a list of abbreviations as they appear on the display and front panel of the unit. ABBREVIATION DESCRIPTION FACTOR SCALING FACTOR - For A and B Inputs. Each input has a separate 5 digit dividing scale factor. DP F A DECIMAL POINT FOR FACTOR A - Enter location of decimal point for scaling Factor A by pressing the button under the digit where the decimal is desired.
LOC LOCK - This portion of the menu allows you to: 1) lock the program (presets are still accessible) 2) lock all (presets and program are locked). LC PRG LOCK PROGRAM - This will lock the program and allow the presets to be changed when the unit is in the lock mode. LC ALL LOCK ALL - This will lock the program and the presets when the unit is in the locked mode. The presets can be viewed, but not changed. CODE LOCK CODE - This message (code) will flash on display for approximately 3 seconds.
CALCULATING SCALE FACTORS There are two separate dividing scale factors, one for input "A" and one for input "B". The factor to enter is the number of pulses per the desired unit of measurement. The factor ranges from 0.0001 to 99999. The factor is the same for rate and count on input "A". Because the "units per second", "minute", or "hour" are field programmable from the keypad, scale factor calculations for the ratemeter are easy.
PROGRAMMING STEP 1 SETTING SCALING FACTORS PRESS PRGM REMARKS This section of the menu is used to set up the scaling factors for inputs A & B. DISPLAY factor This sets the decimal for factor A. Press the arrow key under the digit where the decimal is desired. To clear the decimal, press the arrow key furthest to the right (PRGM) . dp f a ENTER This is the scaling factor for input A. To change, press the arrow key under the digit(s) to change. Press ENTER to enter the displayed value.
STEP 2 SETTING THE COUNTER DPF75 & DPF76 ONLY PRESS DISPLAY PRGM factor PRGM REMARKS This section of the menu sets up the counter information. count rst 0 Press the PRGM key to choose RST 0 (reset to 0, count up) or SET PR (set to preset, count down), press the ENTER key to enter the displayed choice. or ENTER set pr This sets the decimal location for the A & B counters. Press the arrow key under the desired digit location. To clear the decimal, press the arrow key furthest to the right.
PRESS STEP 3 SETTING THE RATE DPF75 & DPF78 ONLY PRGM PRGM DISPLAY factor count rate This section of the menu is used to set up the rate information. rps Press the PRGM key to choose RPS (rate per second) or SCALE (RPM, RPH). Press ENTER to enter displayed choice. PRGM or ENTER scale z 60 or ENTER REMARKS z 3600 Press PRGM to choose ÷60 (RPM) or ÷3600 (RPH). Press ENTER to enter displayed choice. nor ## ENTER This sets the normalizing (averaging) factor.
STEP 4 SETTING LOCK PRESS DISPLAY PRGM factor PRGM PRGM count rate loc PRGM LC PG or ENTER LC ALL CoDE ENTER Flashes followed by: ##### CoDE SETTING THE LOCK STATUS LOCK Flashes followed by: 0 LoC or ENTER REMARKS uN LoC This section of the menu is used to set up the lockout type and code. LC PG = Locks program but presets and reset are accessible. LC ALL= Locks entire keypad. Press the PRGM button to toggle between choices; Press ENTER to enter displayed choice.
PRESS DISPLAY PRGM factor PRGM count PRGM rate PRGM loc STEP 5 SETTING THE RELAYS PRGM This step will only appear on DPF75 ENTER This step will only appear on DPF75 relay This section sets up the relay information. a tot Press the PRGM key to choose A TOT (A assigned to total) or A RATE (A assigned to rate). Press ENTER when the desired choice is displayed. or ENTER a rate A ##.# b tot or ENTER b rate b ##.
OUTPUT WIRING The following diagrams detail the connection of the relay and analog output options. Each relay consist of a form A contact (Normally Open). NPN transistor or Normally Closed contacts are available with solder jumpers (see Jumper Options). SOLENOID (Single Stage) Use Relay A (pins 1 & 2) for single stage preset. When the count or rate (selectable) reaches Preset A, Relay A will energize. When Relay A closes, current passes through the solenoid for activation.
ANALOG OUTPUT OPTION Description: An optional 4-20mA (0-20mA) output has been added to the DPF70 series. The output can be programmed to track rate or total. This feature is available by adding suffix A to the part number. Connections are via a 2 terminal pluggable screw connector. SWITCH 4: Calibrate (normally off) Switch 4 is used for calibration. Calibration is done at the factory and should not be needed (see SWITCH 1 to enter high and low values).
INTERFACE CARD RS 232/422 OPERATION RS 232/422 SET-UP: All serial communication mode changes must be done through serial communications. Mode changes cannot be done through the front panel. To initialize the unit, place a jumper between pin 7(+12V )[bottom board] and pin 1(init) [DB -9 connector] on initial power up. The unit defaults to: 300 baud rate,"MARK" parity and device number 01. To enter the program mode you must set your terminal for 300 baud rate and "MARK" parity.
SERIAL INPUT COMMANDS: To get a unit on line you must address it by its device number. This is done by typing DXX(S), XX= device number. The unit comes on line and echoes back DEVICE# XX. Insure that "DEVICE# XX:" is received before requests are sent. The unit is now ready to receive a command or string of commands separated by a space. A carriage return (enter) will enter the commands and processing of requests begins. The carriage return (Hex Code "D") puts the unit "off line" after data is processed.
RS232 / RS422 WIRING RS 232 COMPUTER HOOKUP: RS 232: When connecting the unit to a computer with RS 232 communication, only three connections are needed. These connections are: Receive data, Transmit data and Ground.
TROUBLESHOOTING GUIDE PROBLEM POSSIBLE CAUSES Power is applied to unit but the display does not light. 1. AC or DC power wiring is incorrect. 1. Recheck power wiring Unit works, but occasionally the display freezes or skips counts. 1. Line noise is affecting the processor due to a current spike or surge. 1. Use a different power supply or install a surge suppressor. Input signal is connected but the unit does not count or display rate. 1. 2. 3. 4. 5. Input wiring is incorrect.
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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’s 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. If the unit malfunctions, it must be returned to the factory for evaluation.
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