www.murata-ps.com DMU-30ACV Series Ruggedized True-rms ac Voltmeters with Daylight Readable, Auto-Dimming LED Displays Murata Power Solutions DMU-30ACV series of daylight-readable ac voltmeters mea- sure and display the true-rms values of complex ac waveforms. 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. And all DMU-30ACV ac voltmeters are packaged in a plastic package with an integrated bezel and gasket assembly designed to meet NEMA-4/IP65 for moisture resistance in outdoor applications. DMU-30ACV series rms voltmeters are available in a choice of three input ranges: 20Vac (with 0.01V resolution) 200Vac (0.1V resolution) and 300Vac (1V resolution). Because the input circuitry is electrically isolated from the units operating power source, these voltmeters can measure ac signals down to zero volts. An input frequency range of 47-1kHz makes these voltmeters ideal for all ac voltage monitoring applications. And, unlike conventional average-responding designs, these meters can measure and accurately FEATURES display the true-rms value of triangle waves, square waves, or any other irregularly shaped waveform, with 0.4% full-scale accuracy. Measures and displays the true-rms value of complex DMU-30ACV series miniature size and ruggedized package is perfect for all industrial ac voltages and high-reliability instrumentation, alternative power generators, and any other application Three input ranges: 20Vac, 200Vac and 300Vac which requires precise ac line monitoring in harsh indoor/outdoor environments. Simply Daylight-readable LED display with automatic connect the input signal and an 85-264Vac source of operating power to the two rear- brightness adjustment mounted terminal blocks and the unit is fully operational. Moisture & impact resistant package offers NEMA-4/IP65 protection Operates from universal 85-264Vac or 110-300Vdc Input circuit fully isolated from operating ac power source TECHNICAL NOTES 47-1kHz input frequency range with crest factors IMPORTANT To ensure safe and reliable operation, DMU-30ACV ac voltmeters must up to 5 be installed and serviced by quali ed technical personnel. Contact Murata Power Solutions if there is any doubt regarding installation and/or operation. 1. Measurement Type: DMU-30ACV series ac voltmeters employ a precision rms-to-dc con- verter and a stable voltage reference to measure and display the rms value of complex ac waveforms. Crest factors as high as 5 produce minimal additional errors (see Perfor- mance Speci cations). 2. Wiring: All ac supply and input signal wiring must be adequately rated for the voltages CAL BRIGHTNESS and currents they will carry, and must comply with any code or application-mandated ADJUST requirements pertaining to the users speci c installation. 3. Power Supply Polarity, Fusing, Wiring and Grounding: The power supply inputs (TB1-1 and TB1-2) on DMU-30ACV 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/ 1 2 1 2 chassis ground. Refer to Figure 1 for a typical wiring diagram. TB1 TB2 Wires speci ed in the Functional Speci cations section must be used for making connec- tions to DMU-30ACV series voltmeters. All power-supply and load wiring must be rated REAR VIEW for the supply voltages and currents they will conduct and must comply with any code or application-mandated requirements pertaining to the users speci c installation. 85-264Vac Input Signal Power Source DMU-30ACV voltmeters are not internally fused. Terminal block TB1 is to be used only for powering the power meters internal circuitry it must not be used to supply power Figure 1. DMU-30ACV wiring diagram to external loads. The supply wires feeding these power meters must be fused with a 0.5A/250V time delay/time lag fuse, in accordance with applicable regulatory codes. Wire insulation must be stripped to within 10% of the stated dimensions, and wires should be inserted into TB1 such that their insulation is not pinched by the screw terminal. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MPM DMU-30ACV.C02 Page 1 of 3DMU-30ACV Series Ruggedized True-rms ac Voltmeters with Daylight Readable, Auto-Dimming LED Displays Performance/Functional Speci cations TECHNICAL NOTES (continued) Typical at TA = +25C, 60Hz sine-wave input, unless otherwise noted. 4. Calibration: Periodic recalibration of DMU-30ACV voltmeters is Input (TB2) Min. Typ. Max. Units not required under most indoor operating environments. However, Full Scale Input Range: units operating in environments subject to vibration and/or extreme DMU-30ACV-0 0 19.99 Vac temperature variations should have their accuracy veri ed on a yearly DMU-30ACV-1 0 199.9 Vac basis. If recalibration is necessary, it should only be performed by quali ed technical personnel. Calibration is performed with potentially DMU-30ACV-2 0 300 Vac lethal voltages applied to the DMU-30ACV and its associated wiring. Input-Voltage Frequency Range 47 60 1000 Hz A plastic, fully-insulated adjusting tool must be used to access the re- Performance cessed potentiometers located on the back of the unit (see Mechanical Sampling Rate 2.5 readings per second Speci cations). Contact Murata Power Solutions if additional informa- Accuracy 0.4%FS 2 counts w/ 60Hz tion is required regarding calibration, setup, or any other technical sine-wave input issue pertaining to DMU-30ACV ac voltmeters. Measurement Type RMS responding, Crest Factors of 1-5 5. Minimum-Intensity Adjustment Potentiometer: Users can adjust Zero Reading (within 30 sec.) 002 000 002 Cnts the DMU-30ACVs minimum LED display brightness to suit their indoor Temperature Drift (0 to +60C) 0.2 0.4 Cnts/C viewing requirements by adjusting the -turn, rear-mounted intensity adjustment potentiometer. Please note, this potentiometer will have Breakdown Voltage (TB1 to TB2) 2000 Vdc minimal impact on display brightness in high ambient light environ- Supply Voltage (TB1) ments. DMU-30ACV 85 264 Vac/47- 63Hz The intensity adjustment potentiometer is factory preset to its mid- point position. As viewed from the rear of the meter, and with the Supply Current (TB1) model number label facing up, turning the potentiometer clockwise DMU-30ACV (total darkness) 4 6 mA/47- increases the LED displays intensity. See the Mechanical Speci ca- 63Hz tions section for potentiometer locations. DMU-30ACV (full sunlight) 40 50 mA/47- 63Hz 6. 2-Wire Operation: In indoor applications where daylight readability Terminal Block Wiring (TB1 & TB2) (i.e., maximum display brightness) is not required, DMU-30ACV meters will meet their speci ed accuracy with ac supply voltages (TB1) well Wire Size 16-22 AWG, Solid or stranded below 85Vac. While performance is not guaranteed, DMU-30ACV Insulation Strip Length 0.250 inches (6.35) voltmeters remain easily readable and accurate with ac supplies as Screw Tightening Torque 2.2 lbin (0.25 Nm) 20% low as 20Vac in most indoor environments. Rated Voltage 300Vac Please note, when operated indoors in a 2-wire mode (i.e., TB1 and Display TB2 are connected to the same ac voltage), DMU-30ACV series input Display Type and Size Daylight readable, auto-dimming, current will increase as the input supply is decreased. At 20Vac, the 3 digit, 0.56 /14.2mm high red LED input supply current will be approximately 30mA. Decimal Point Fixed, model dependent Overrange Indication1 Physical/Environmental Operating Temperature 25 +60 C Ordering Information Storage Temperature 40 +75 C Model Input Range Humidity (non-condensing) 0 85 % Dimensions See mechanical speci cations DMU-30ACV-0-DR-C 0 to 19.99Vac DMU-30ACV-1-DR-C 0 to 199.9Vac Weight 1.3 ounces (36 grams) nominal DMU-30ACV-2-DR-C 0 to 300Vac See www.murata-ps.com/dpm-availability for model-speci c availability. Speci ed accuracy applies to inputs with crest factors (CF) up to 2.0, where CF = Vpeak/ Vrms. Crest factors of 2-5 introduce an additional eror of 3% of full scale. Voltmeters are calibrated with near full-scale, 60Hz sine-wave input. Display reading is set to 1888. Speci ed 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/support MPM DMU-30ACV.C02 Page 2 of 3