www.murata-ps.com DMS-20ACV Series 480V, Self-Powered, AC Line Monitor FEATURES PRODUCT OVERVIEW Self-powered, 2-Wire operation Murata Power Solutions DMS-20ACV-3 is a low-cost, self-powered, 2-wire digital AC voltmeter designed for monitoring 3-phase, 480Vac primary ac power sources. The DMS-20ACV-3s unique power-supply 350 to 600Vac (50/60Hz) measurement range design allows a single model to operate from 350 to 600Vac, at line frequencies of 50 to 60Hz. No user- Digital replacement for analog panel meters supplied external components or auxiliary power sources are needed for full operation. Its large, 0.40 inch Permanent, tamper-proof calibration (10.2mm), bright red or green LED display is easily readable under virtually all lighting conditions. DMS-20ACV-3 AC voltmeters employ a microprocessor driven, half-wave averaging, analog-to-digital Half-wave averaging, rms calibrated input converter to achieve a display resolution of 1Vac over its entire operating range. Also, the unit is per- Large, easy-to-read, bright red or green LED manently calibrated at the factory, ensuring stable, long-term accuracy by eliminating issues caused by display user-accessible adjustment potentiometers. Flashing display warns of overvoltage conditions The DMS-20ACV-3 measures only 1.94 wide x 1.27 high (49.3mm x 32.3mm), and has an installed behind-the-panel depth of less than 1.0 (25.4mm). Panel mounting is greatly simpli ed by the use of a Reliable screw-style terminal block simpli es bezel assembly that includes a color lter and secure metal fasteners. hookup This easy-to-use AC voltmeter is the ideal digital upgrade for fragile, less accurate, analog panel meters Rugged bezel assembly with secure metal used in 480Vac power distribution environments. It similarly excels in any new application requiring accu- fasteners rate, high-voltage, AC line monitoring. Simply connect the AC power source to its 2-position terminal block Small footprint: 1.94 x 1.27 (49mm x 32mm) and the unit is fully operational. MECHANICAL SPECIFICATIONS FRONT VIEW SIDE VIEW 1.260 (32.00) 1.930 0.28 (49.02) (7.1) 0.64 BACK VIEW (16.3) A MECHANICAL DIMENSIONS: Inches (mm) TOLERANCES: 2 PL DEC 0.02 (0.51) 3 PL DEC 0.010 (0.254) B TB1 For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MPM DMS-20ACV.B02 Page 1 of 4DMS-20ACV Series 480V, Self-Powered, AC Line Monitor TECHNICAL NOTES Performance/Functional Speci cations Typical at TA=+ 25C, 480Vac 60Hz, unless otherwise noted IMPORTANT To ensure safe and reliable operation, DMS-20ACV ac voltmeters must be installed and serviced by quali ed technical Input Supply Voltage (Vin TB1) Min. Typ. Max. Units personnel. Contact Murata Power Solutions if there is any doubt AC (rms) Voltage 47-63Hz 350 480 600 Volts AC regarding installation and/or operation. Performance 1. Measurement Type: DMS-20ACV series AC voltmeters employ a Sampling Rate 2 samples/sec precision analog-to-digital converter and a stable voltage reference to Voltage Accuracy 25 C 2 4 Volts measure and display the average value of sinusoidal AC mains voltages. Temperature Drift (0 to 60C) 0.05 Volts/C Input voltages of 601V and above will cause the display to ash on and Half-wave averaging, rms calibrated for off. Measurement Type sinusoidal inputs 2. Calibration: DMS-20ACV voltmeters are digitally calibrated at the fac- Supply Current tory there is no provision for calibrating units in the eld. 50Hz 8 11 mA 3. Power Supply Polarity, Fusing, Wiring, and Grounding: DMS-20ACV-3s 60Hz 9 13 mA TB1 ac-supply terminals are not polarity sensitive, that is, they have Display no AC LO or AC HI designations. These meters do not include nor Display Type 3 Digit LED require a connection to earth/chassis ground. Display Size 0.40 inches (10.16mm) high DMS-20ACV-3 AC voltmeters are not internally fused. Terminal block Overrange Indication Flashing display for Vin > 600 Volts TB1 is to be used only for powering the voltmeters internal circuitry it Physical/Environmental must not be used to supply power to external loads or auxiliary devices. Weight 1.0 ounces (28 grams) The supply wires connected to TB1 must be fused with a 0.25A/600V Operating Temperature -25 60 C time delay/time lag fuse, in accordance with applicable regulatory codes. Storage Temperature -40 75 C Relative Humidity (Non Condensing) 0 85 % All AC-supply wiring must be rated for the voltages and currents they will conduct and comply with any code or application-mandated requirements pertaining to the users speci c installation. 600V, UL- Ordering Information rated wire suitable for the intended application is required. DMS-20ACV-3-R-C 350 to 600Vac (50/60Hz) Red LED Display 2 The recommended AC supply wire size is 16AWG to 22AWG (1.31mm DMS-20ACV-3-G-C 350 to 600Vac (50/60Hz) Green LED Display 2 to 0.325mm ) stranded copper wire. The supply wires must be properly stripped and attached to TB1 such that their insulation is not pinched by the screw terminal. Recommended insulation strip length is 0.25 (6.4mm). Rated tightening torque for the TB1s screws is 7 pound- inches (0.8 N-m). BACK VIEW Fuse* 0.25A/600V A 350-600 Vac 47-63 Hz B TB1 Figure 1. Wiring Diagram *See technical note 3. www.murata-ps.com/support MPM DMS-20ACV.B02 Page 2 of 4