NANO DMR20-1-ACV www.murata-ps.com Self-Powered, 85 to 264Vac, LED Display Line Monitor FEATURES Universal 85 to 264Vac measurement range Self-powered directly from the AC supply Installs in oiltight1.20 inch (30.5mm) round cutouts Four-digit LED display with overvoltage indication Reads true-rms value to 0.1V resolution Knockout punches and tooling available Digital replacement for analog panel meters Screw-style terminal block simpli es installation Self-resetting internal fuse for long-term reliability Provides moisture resistance to IP67/NEMA 6 Murata Power Solutions new DMR20-1-ACV self-powered, AC line-voltage monitors are Supplied with EPDM rubber gasket and plastic hex nut designed to measure and display the true-rms voltage of AC power systems. Simply con- nect any 85 to 264Vac 50/60Hz power source and these meters are fully operationalno UL/CSA approvals pending additional components or power sources are required. The unit can also measure distorted AC power sources including triangle, square, and the quasi-sine output of many DC to AC power inverters. Performance/Functional Speci cations Typical at Ta = +25C, n = 60Hz The DMR20-1-ACV is housed in a rugged, round polycarbonate case that provides excellent protection against moisture, dust, shock and vibration. Panel installation is straightforward: AC Input (TB1) Using readily available tooling, simply drill and punch a 1.2 inch (30.5mm) diameter hole and Voltage Range 85 to 264Vac (47-63 Hz) anti-rotation notch, insert the meter and gasket, and securely fasten the meter using the sup- Current Consumption Vin = 250Vac: 30mA (max.) plied hex nut. The supplied hardware is designed to provide protection to IP67/NEMA 6. Vin = 120Vac: 15mA (max.) Their large, 0.30 /7.6mm, bright LED displays can be easily read from 10 feet away (3 Performance Sampling Rate 2.5 readings/second meters). These meters accurately display ac voltages with 0.1V resolution. A built-in reset- Resolution 0.1Vdc table fuse assures long term reliability. All DMR20-1-ACVs employ a 13-bit A/D converter Accuracy +25C .1V (typ.), .2V (max.) and precision metal- lm resistors to achieve outstanding performance over an operating Temperature Drift (25 to +60C) 0.05V/C (max.) temperature range of 25 to +60C. Mechanical Dimensions 1.50 diameter x 1.15 dept (38.1 x 29.2mm) Display Type Four digit, LED, 0.30 high (7.6mm) Ordering Information Weight 0.8 ounce (23 grams) DMR20-1-ACV-R-C 85 to 264Vac voltage monitor (Red LED) Case Material Polycarbonate Terminal Block Torque 3.6 in-lbs (0.4 N-m) 2 Knockout Punches Wire Size And Type 18-22AWG (0.83-0.33mm ) copper, DMR20-1-KP 1.2 (30.5mm) Round knockout punch solid or stranded (no keying notch) Wire Insulation Strip Length 0.25 (6.4mm) DMR20-2-KP 1.2 (30.5mm) Round knockout punch Environmental (with four keying notches) Operating Temperature 25 to +60C DMR20-3-KP 1/8 and 3/16 (3.2 and 4.7mm) Storage Temperature 40 to +75C key-notch nibbler tool Humidity (non-condensing) 0 to 85% Note: An M30 x 1.5 nylon hex nut and EPDM sealing gasket are supplied with each Operation and accuracy at inputs above or below these ranges are not speci ed. meter. The -C suf x denotes RoHS compliance. For full details go to www.murata-ps.com/rohs (pending) (pending) www.murata-ps.com/support MPM DMR20-1-ACV.A02 Page 1 of 4NANO DMR20-1-ACV Self-Powered, 85 to 264Vac, LED Display Line Monitor TECHNICAL NOTES IMPORTANT To ensure safe and reliable operation, DMR20-1-ACV Panel Materials: AC voltage monitors must be installed and serviced by quali ed Acceptable panel materials include aluminum, mild steels, plastics, technical personnel. Contact Murata Power Solutions if there is FR-4 pc-board ( berglass), and many other materials with a at matte any doubt regarding installation or operation. surface on both sides of the cutout. The DMR-20-x-KP tools can be 1. Measurement Type: DMR20-1-ACV series AC voltmeters employ a used with most panel materials except for stainless steel or other precision true-rms signal conditioning IC, a 13-bit analog-to-digital hardened metals. converter, and a stable voltage reference to measure and display 85 to DMR20-1-ACV has passed vibration testing combined with temperature 264Vac 50/60Hz AC supplies. DMR20-1-ACV voltmeters can be pow- cycling while mounted to the materials noted above, using the speci- ered fromand accurately measureAC supplies with sine, triangle, ed tightening torques. If the voltmeter will be mounted to extremely square, and quasi-sine waveforms. High-frequency harmonic compo- smooth, slippery surfaces, the user is advised to test the completed nents up to 65kHz will be measured with minimal additional error. assembly under the environmental conditions encountered in the end 2. Calibration: DMR20-1-ACV voltmeters are factory calibrated there are application. no provisions for calibrating these meters in the eld. 5. AC Input Fusing and Wiring: DMR20-1-ACV voltmeters contain an 3. Operating Range: As the AC input voltage is lowered to 95.0Vac (50 or internal, self-resettable fuse. However, the supply wires connected to 60Hz) or below, the DMR20-1-ACVs display will begin to dim slightly, input terminals TB1-A and TB1-B must be fused with an external, user but it will remain accurate down to its 85Vac rating. Input voltages supplied, 0.25A/300V time delay/time lag fuse, in accordance with above 265Vac will cause the display to ash on and off at approxi- applicable regulatory codes. mately one-second intervals. All supply wiring must be rated for the voltages and currents they will 4. Panel Installation: All electrical connections to DMR20-1-ACV must conduct and comply with any code or application-mandated require- be made after the voltmeter is securely attached to the panel, and with ments pertaining to the users speci c installation. 300V, UL-rated the input AC supply de-energized (off). In high-vibration environments, hook-up wire suitable for the intended application is required. TB1 is to adequate strain reliefs must be used on all supply wiring. See Figure 1 be used only for powering the meters internal circuitry it must not be for typical panel mounting details. used to supply power to external loads. 2 Tightening Torque: The recommended TB1 supply wire size is 18AWG to 22AWG (0.83mm 2 to 0.33mm ) solid or stranded copper wire. The supply wires must be The recommended tightening torque for the M30 x 1.5 plastic hex nut properly stripped and attached to TB1 such that their insulation is not is 10 to 17 in-lbs (1.3 to 1.9 N-m). If a torque wrench is not available, pinched by the screw terminal. Recommended insulation strip length is this recommended range can be approximated by hand tightening the 0.25 (6.4mm). When using stranded wire, verify that there are no loose hex nut SLOWLY until it just bottoms out against the panels rear sur- or stray strands that could potentially cause a short circuit across the face. From this bottomed-out reference position, using a suitable tool, AC supply input. tightening the hex nut turn clockwise will produce approximately 10 in-lbs (1.3 N-m) of torque tightening it 3/8 turn clockwise will produce 6. AC Input Polarity and Grounding: The AC supply inputs TB1-A and approximately 17 in-lbs (1.9 N-m). TB1-B terminals are not polarity sensitive, that is, neither terminal is designated as AC LO or AC HI. DMR20-1-ACV voltmeters do not Check to make sure the housings anti-rotation key is aligned with the include, nor require, a connection to earth/chassis ground. notches on both the panel and the gasket before tightening the hex nut. Over tightening the hex nut will distort the rubber gasket and may damage the threads on both the nut and the housing, thereby compro- mising the installations mechanical integrity and its ability to protect against environmental effects. Panel Thickness: When using both the factory supplied EPDM gasket and hex nut (the recommended standard installation method), the DMR20-1-ACV can be mounted in panels ranging from 0.032 to 0.250 (0.8 to 6.4mm) thick. When the gasket is not used, the panel thickness range is 0.075 to 0.325 (1.9 to 8.3mm). However, using the factory supplied hardware and tightening torque recommendations results in optimal resistance to vibration, dust, and moisture ingress. Figure 1. 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