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| www.murata-ps.com DMU-30DCV Series Ruggedized DC Voltmeters with Daylight Readable Auto-Dimming LED Displays FEATURES Measure and accurately display dc voltages in harsh environments Four input ranges: 200mVdc, 2Vdc, 20Vdc, and 200Vdc Daylight-readable LED display with automatic brightness adjustment Moisture & impact resistant package offers NEMA-4/IP65 protection Operates from universal 85-264Vac mains, or 110-300Vdc supplies Input circuit fully isolated from ac power supply UL certification pending Murata Power Solutions' DATEL branded DMU-30DCV series of daylight-readable dc voltmeters measure and display dc signals as low as 200mV and as high as 200V. Their large 0.56" (14.2mm) high super-bright red LED-display is readable in full sunlight. An auto-dimming circuit automatically adjusts the display brightness for all viewing conditions. DMU-30DCV series dc voltmeters are packaged in a rugged, one-piece polycarbonate plastic housing that features an integrated bezel and gasket assembly. In a typical installation, the housing is secured to a panel with six metallic threaded inserts, allowing the unit to meet NEMA-4 / IP65 requirements for moisture and impact resistance in outdoor applications. DMU-30DCV series dc voltmeters are available in a choice of four input ranges: 200mVdc (with 0.1mV resolution); 2Vdc (0.001V resolution); 20Vdc (0.01V resolution); and 200Vdc (0.1V resolution). The dc signal under measurement is electrically isolated from the unit's operating power source. DMU-30DCV series' miniature size and rugged package are perfect for industrial and high-reliability instrumentation, alternative power generators, and any other application which requires daylight readability and precise monitoring of dc voltages in harsh indoor / outdoor environments. Simply connect the input signal and an 85-264Vac source of operating power to the two rear-mounted terminal blocks and the unit is fully operational. TECHNICAL NOTES IMPORTANT! To ensure safe and reliable operation, DMU-30DCV dc voltmeters must be installed and serviced by qualified technical personnel. Contact Murata / DATEL if there is any doubt regarding installation and/or operation. 1. Measurement Type: All DMU-30DCV series dc voltmeters achieve their excellent performance by employing a precision integrating analog-to-digital converter, metal film resistor dividers, and a high-stability voltage reference IC. The LED display is updated approximately 2.5 to 3 times per second. However, while some input filtering is provided, noisy signals may cause the displayed reading to vary by a few counts. CAL BRIGHTNESS ADJUST 2. Wiring: All ac supply (TB1) and input signal (TB2) wiring must be adequately rated for the voltages and currents they will carry, and must comply with any code or applicationmandated requirements pertaining to the user's specific installation. 3. Power Supply Polarity, Fusing, and Grounding: The operating-supply terminals (TB1-1 and TB1-2) on DMU-30DCV voltmeters are not polarity sensitive, that is, they have no "AC LO" or "AC HI" designations. These units do not include or require a connection to earth/ chassis ground. Refer to Figure 1 for a typical wiring diagram. DMU-30DCV dc voltmeters are not internally fused. If fusing is required, it must be externally user-provided according to the supply wire's maximum amperage rating. 1 TB1 2 1 2 TB2 REAR VIEW 85-264Vac Power Source Input Signal Figure 1. DMU-30DCV wiring diagram For full details go to www.murata-ps.com/rohs 4. Calibration: Periodic recalibration of DMU-30DCV voltmeters is not required under normal indoor operating environments. However, operation in environments subject to vibration and/or extreme temperature variations should have their accuracy verified on a yearly basis. If recalibration is necessary, it should only be performed by qualified technical personnel. Calibration is performed with potentially lethal voltages applied to the DMU-30DCV and its associated wiring. A plastic, fully-insulated adjusting tool must be used to access the recessed calibration potentiometer located on the back of the unit (see Mechanical Specifications). Contact Murata / DATEL if additional information is required regarding calibration, setup, or any other technical issue pertaining to DMU-30DCV dc voltmeters. Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 MPM_DMU_30DCV.A05 Page 1 of 3 DMU-30DCV Series Ruggedized DC Voltmeters with Daylight Readable Auto-Dimming LED Displays TECHNICAL NOTES (continued) 5. Minimum-Intensity Adjustment Potentiometer: Users can adjust the DMU-30DCV's minimum LED display brightness to suit their indoor viewing requirements by adjusting the 3/4-turn, rear-mounted intensity adjustment potentiometer. Please note, this potentiometer will have minimal impact on display brightness in high ambient light environments. The intensity adjustment potentiometer is factory preset to its midpoint position. As viewed from the rear of the meter, and with the model number label facing up, turning the potentiometer clockwise increases the LED display's intensity. See the Mechanical Specifications section for potentiometer locations. 6. Operation with Power Supplies Lower than 85Vac: In indoor applications where daylight readability (i.e., maximum display brightness) is not required, DMU-30DCV meters will meet their specified accuracy with ac supply voltages (TB1) well below 85Vac. While performance is not guaranteed, DMU-30DCV voltmeters' remain easily readable and accurate with ac supplies as low as 20Vac. 7. Panel Installation: All electrical connections to DMU-30DCV must be made after the meter is securely attached to the panel and with all input and supply voltages de-energized (off). Care must be exercised when attaching conductors to terminal blocks TB1 and TB2. The installed wire-positions should be such that minimal forces are applied to the terminal blocks or the voltmeter. In high-vibration environments, adequate strain reliefs must be used on all input and supply wiring. To ensure a secure and moisture/vibration resistant installation, use only the supplied hardware. Following the four-step sequence shown--being careful not to apply excessive force or twisting motions--insert the voltmeter into the panel opening. Tighten all six M3 metric screws to 3 inch-pounds (0.34Nm). See the Mechanical Specifications section for panel cutout, drill dimensions, and panel installation information. Performance/Functional Specifications Typical at TA = +25C, unless otherwise noted. Input (TB2) Full Scale Input Range: DMU-30DCV-0-DR-C DMU-30DCV-1-DR-C DMU-30DCV-2-DR-C DMU-30DCV-3-DR-C Performance Sampling Rate Accuracy Zero Reading (within 30 sec.) Temperature Drift (0 to +60C) Breakdown Voltage (TB1 to TB2) Supply Voltage (TB1) DMU-30DCV Supply Current (TB1) c DMU-30DCV (total darkness) DMU-30DCV (full sunlight) Terminal Block Wiring (TB1 & TB2) Wire Size Insulation Strip Length Screw Tightening Torque Rated Voltage Display Display Type and Size Decimal Point Overrange Indication Physical/Environmental Operating Temperature Storage Temperature -25 -40 0 - - - +60 +75 85 C C % Daylight readable, auto-dimming, 31/2 digit, 0.56"/14.2mm high red LED Fixed, model dependent "1_ _ _ " 16-22 AWG, Solid or stranded 0.250 inches (6.35) 3.6 pound-inches (0.4Nm) 300Vac - - 4 40 6 50 mA/4763Hz mA/4763Hz 85 - 264 Vac/4763Hz "-001" - 2000 2.5 readings per second 0.4%FS 2 counts "000" 0.2 - "001" 0.4 - Cnts Cnts/C Vdc 0 0 0 0 - - - - 199.9 1.999 19.99 199.9 mVdc Vdc Vdc Vdc Min. Typ. Max. Units Ordering Information Model DMU-30DCV-0-DR-C DMU-30DCV-1-DR-C DMU-30DCV-2-DR-C DMU-30DCV-3-DR-C Input Range 0 to 199.9mVdc 0 to 1.999Vdc 0 to 19.99Vdc 0 to 199.9Vdc Humidity (non-condensing) Dimensions Weight See mechanical specifications 1.3 ounces (36 grams) nominal Display reading is set to "1888". Specified power supply currents are steady state; larger surge currents can occur at initial application of ac power. Power supply input (TB1) set to 120Vac/60 Hz. www.murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 MPM_DMU_30DCV.A05 Page 2 of 3 DMU-30DCV Series Ruggedized DC Voltmeters with Daylight Readable Auto-Dimming LED Displays Mechanical Dimensions: Inches (mm) Tolerances: 2 PL DEC 0.02 (0.51) 3 PL DEC 0.010 (0.254) 2.85 (72.39) 1.5 (38.1) M3 INSERT 0.10 (2.54) DEPTH 1.60 (40.64) CAL BRIGHTNESS ADJUST 1.97 (50.0) 0.26 (6.6) 1 TB1 2 1 2 TB2 FRONT VIEW PWR SUPPLY INPUT REAR VIEW VIN SIGNAL INPUT RECOMMENDED DRILL AND PANEL CUTOUT 2.118 (53.8) 0.136 (3.45) DIA (6 REQUIRED) Note: The supplied screws and washers will accommodate panel thicknesses from 0.060 to 0.090 inches (1.52 to 2.28 mm). 1.30 (33.02) PANEL CUTOUT 0.878 (22.3) 1.26 (32.00) 2.52 (64.00) INTERNAL CORNER RADII 0.032 (0.81) MAX. PANEL INSTALLATION Step 1. Step 2. Step 3. Step 4. USA: Canada: UK: France: Germany: Japan: China: Singapore: Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Munchen, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED 03/18/09 Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. (c) 2009 Murata Power Solutions, Inc. www.murata-ps.com MPM_DMU_30DCV.A05 Page 3 of 3 |
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