NANO www.murata-ps.com DMR20-1-FM Self-Powered, LED Display, AC Line Frequency Monitor FEATURES Self-powered from 85 to 264Vac / 45-65Hz supplies 0.01Hz resolution & quartz crystal accuracy and stability Installs in oiltight 1.20 inch (30.5mm) round cutouts Four-digit LED display with out-of-range indication Digital replacement for analog panel meters Self-resetting internal fuse for long-term reliability Supplied with EPDM rubber gasket and plastic hex nut E156931 Provides moisture ingress protection to IP67/NEMA 6 Murata Power Solutions new DMR20-1-FM is the worlds smallest, self-powered, ac line Screw-style input terminal block simplies installation frequency monitor. Simply connect 85 to 264Vac (45-65Hz) power and the meter is fully Knockout punches and tooling available operationalno additional components are required. The unit can also measure distorted Approvals to UL/cUL/IEC/ 61010-1 120Vrms power sources with triangle and square waveforms, as well as quasi sine wave outputs of dc to ac power inverters. Performance/Functional Speci cations An ultra-stable, quartz-crystal controlled microprocessor provides accuracies of 0.02Hz Typical at Ta = +25C, Vin = 250Vac / 60Hz sine wave, unless over the operating temperature range of -25 to +60C. DMR20-1-FM frequency moni- otherwise noted tors feature a large, 0.30/7.6mm, bright LED display that can be easily read from 10 feet away (3 meters). A built-in resettable fuse and out-of-range indication assures long term AC Input (TB1) Voltage Range reliability. 85 to 264Vac (45-65 Hz) Current Consumption 250Vac/60Hz: 12mA (max.) The DMR20-1-FM is housed in a rugged, round polycarbonate case that provides excellent UL/IEC61010-1 Measurement Category II protection against moisture, dust, shock and vibration. Panel installation is straightforward: Performance using available tooling, simply drill and punch a 1.2 inch (30.5mm) diameter hole and Sampling Rate 2-3 readings/second anti-rotation notch, insert the meter and gasket, and securely fasten the meter using the Resolution 0.01Hz supplied hex nut. The nut and gasket are designed to provide moisture ingress protection to Accuracy +25C 0.01Hz (typ.), 0.02Hz (max.) IP67/NEMA 6. Temperature Drift 0.0005Hz/C (25 to +60C) DMR20-1-FM is exactly the same size as Murata Power Solutions DMR20-1-ACV (ac volts), Mechanical DMR20-10-DCM (dc volts), and DMR20-1-TMP (temperature) digital panel meters. Dimensions 1.5 diameter x 1.1 depth (38 x 28mm) Display Type Four digit, LED, 0.30 high (7.6mm) Ordering Information Weight 0.9 ounces (25.5 grams) Case Material Polycarbonate DMR20-1-FM-R-C 85 to 264Vac frequency monitor (Red LED) Terminal Block Torque 2.2 lbin (0.25 Nm) 20% 2 Wire Size And Type Knockout Punches 18-22AWG (0.83-0.33mm ) copper, 1.2 (30.5mm) Round knockout punch solid or stranded DMR20-1-KP Wire Insulation Strip Length (no keying notch) 0.25 (6.4mm) 1.2 (30.5mm) Round knockout punch Environmental DMR20-2-KP (with four keying notches) Operating Temperature 25 to +60C 1/8 and 3/16 (3.2 and 4.7mm) Storage Temperature DMR20-3-KP 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 meter. The -C suf x denotes RoHS compliance. Operation and accuracy with ac inputs above or below this range are not specied. Operation from waveforms other than sine waves is limited to 120Vrms. See Technical Note 1 for additional information. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MPM DMR20-1-FM.A02 Page 1 of 3NANO DMR20-1-FM Self-Powered, LED Display, AC Line Frequency Monitor TECHNICAL NOTES IMPORTANT To ensure safe and reliable operation, DMR20-1-FM ac Panel Materials: frequency monitors must be installed and serviced by qualied 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 their installation or operation. surface on both sides of the cutout. The DMR-20-x-KP tools can be 1. Measurement Type: DMR20-1-FM meters are designed to be powered used with most panel materials except stainless steel or other hard- from sine wave ac supplies, over their rated input of 85-264Vac (45- ened metals. 65Hz). Operation from triangle, square, and quasi-sine waveforms is DMR20-1-FM has passed vibration testing combined with temperature limited to a maximum of 85 to 120rms (45-65Hz). cycling while mounted to the materials noted above, using the specied 2. Calibration: DMR20-1-FM frequency monitors are factory calibrated tightening torques. If the meter will be mounted to extremely smooth, there are no provisions for calibrating these meters in the eld. slippery surfaces, the user is advised to test the completed assembly under the environmental conditions encountered in the end application. 3. Operating Range: As the sine wave ac input voltage is lowered below 100Vac (50 or 60Hz), the DMR20-1-FMs display may begin to dim 5. AC Input Fusing and Wiring: DMR20-1-FM frequency monitors slightly, but the readings will remain accurate down to 85Vac. Input contain an internal, self-resettable fuse. However, the supply wires frequencies below 45Hz and above 65Hz will display as four dashes, connected to input terminals TB1-A and TB1-B must be fused with an indicating an out-of-range input condition. external, user supplied, 0.25A/300V time delay/time lag fuse, in accor- dance with applicable regulatory codes. 4. Panel Installation: All electrical connections to DMR20-1-FM must be made after the meter is securely attached to the panel, and with All supply wiring must be rated for the voltages and currents they will the input ac supply de-energized (off). In high-vibration environments, conduct and comply with any code or application-mandated require- adequate strain reliefs must be used on all supply wiring. See Figure 1 ments pertaining to the users specic installation. 300V, UL-rated for typical panel mounting details. hook-up wire suitable for the intended application is required. TB1 is to be used only for powering the meters internal circuitry it must not be Tightening Torque: used to supply power to external loads. The recommended tightening torque for the M30 x 1.5 plastic hex nut 2 The recommended TB1 supply wire size is 18AWG to 22AWG (0.83mm is 10 to 17 in-lbs (1.3 to 1.9 N-m). If a torque wrench is not available, 2 to 0.33mm ) solid or stranded copper wire. The supply wires must be this recommended range can be approximated by hand tightening the properly stripped and attached to TB1 such that their insulation is not hex nut SLOWLY until it just bottoms out against the panels rear sur- pinched by the screw terminal. Recommended insulation strip length is face. From this bottomed-out reference position, using a suitable tool, 0.25 (6.4mm). When using stranded wire, verify that there are no loose tightening the hex nut turn clockwise will produce approximately 10 or stray strands that could potentially cause a short circuit across the in-lbs (1.3 N-m) of torque tightening it 3/8 turn clockwise will produce ac supply input. approximately 17 in-lbs (1.9 N-m). 6. AC Input Polarity and Grounding: The ac supply inputs TB1-A and Check to make sure the housings anti-rotation key is aligned with the TB1-B terminals are not polarity sensitive, that is, neither terminal is notches on both the panel and the gasket before tightening the hex designated as AC LO or AC HI. DMR20-1-FM frequency monitors do nut. Over tightening the hex nut will distort the rubber gasket and may not include, nor require, a connection to earth/chassis ground. 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-FM 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 provides optimal resistance to vibration, dust, and moisture ingress. Figure 1. Panel Installation www.murata-ps.com/support MPM DMR20-1-FM.A02 Page 2 of 3