DMS-20PC-3-LM www.murata-ps.com Self-Powered LED Display 480V AC Line Monitor OBSOLETE PRODUCT Contact Factory for Replacement Model FEATURES ■ Self-powered, two-terminal operation ■ 350 to 600Vac operating input range ■ Half-wave averaging, rms calibrated ■ Large, easy-to-read, bright red or green LED display ■ Rugged, epoxy-encapsulated construction ■ Built-in bezel for panel mounting ■ Reliable screw terminals for easy installation ■ Small 1.38˝ x 0.88˝ x 1.0˝ package Functional Specifications Input Voltage Range ➀ Current Consumption 350-600Vrms (47-63Hz) 50mArms (max.) Performance Sampling Rate Measurement Type DATEL’s DMS-20PC-3-LM is a low-cost, self-powered, 2-wire digital voltmeter designed for monitoring 480Vac 3-phase primary power. The DMS-20PC-3-LM’s unique power-supply design allows a single model to operate from 350 to 600Vac (47-63Hz). The meter requires no external components or auxiliary power for full operation! Its large, 0.37˝/9.4mm, bright red or green LED display is easily readable under virtually all lighting conditions. DMS-20PC-3-LM employs rms calibrated, half-wave sinusoidal averaging to achieve a display resolution of 1Vac over its full operating range. Packaged in a subminiature (1.38˝ x 0.88˝ x 1.0˝) red-filter case with a built-in bezel, the meter is epoxy encapsulated for ruggedness. An optional bezel assembly, featuring metal fasteners, simplifies panel mounting. This easy-to-use, vibration-proof voltmeter is the ideal digital upgrade for fragile analog-style panel meters in 480Vac power distribution equipment. It similarly excels in any new application requiring accurate, high-voltage, ac line monitoring. 2.5 readings/second Half-wave average, rms calibrated for sinusoidal input ±1V (typ.), ±2V (max.) Accuracy @ +25°C Temperature Drift (–25 to +60°C) Typical panel mount installation and suggested wiring (user supplied) Ordering Information ±0.15 Volts/°C (max.) Mechanical Dimensions Display Type Weight Case Material 6-32 screw torque Environmental Operating Temperature Storage Temperature Humidity (Non-condensing) 1.38˝ x 0.88˝ x 1.00˝ 3 digit LED, 0.37˝/9.4mm 1 ounce (28 grams) Polycarbonate 6-8 in-lb (0.7 – 0.9N-m) DMS-20PC-3-LM-C DMS-20PC-3-LM-G-C DMS-BZL3-C DMS-BZL4-C DMS-20-CP Red LED display Green LED display Panel mount bezel Panel mount bezel with sealing gasket Panel cutout punch Brass screws (6-32 thread) and a panel-mount retaining clip are supplied with each meter –25 to +60°C –40 to +75°C 0 to 95% ➀ Operation and accuracy at inputs above or below this range are not specified. FUSED AC POWER SUPPLY For full details go to www.murata-ps.com/rohs Typical Connection Diagram www.murata-ps.com/support MPM_DMS-20PC-3LM_D07 Page 1 of 2 DMS-20PC-3-LM Self-Powered LED Display 480V AC Line Monitor Power Supply Polarity, Fusing, Wiring, and Grounding: DMS-20PC-3-LM’s ac-supply terminals are not polarity sensitive, that is, they have no “AC LO” or “AC HI” designations. These meters do not include nor require a connection to earth/chassis ground. standoff input-terminals are to be used only for powering the voltmeter’s internal circuitry; they must not be used to supply power to external loads. The supply wires feeding these voltmeters must be fused with a 0.25A/600V time delay/time lag fuse, in accordance with applicable regulatory codes. 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 user’s specific installation. 600V UL rated wire suitable for the intended application is required. The recommended wire size is 16AWG to 20AWG (1.31mm2 to 0.52mm2) stranded copper wire. Wires must be properly stripped and attached to the threaded standoffs such that their insulation is not pinched by the supplied 6-32 screws. Rated tightening torque for the 6-32 screws is 7 to 8 poundinches (0.8 to 0.9N-m). DMS-20PC-3-LM ac voltmeters are not internally fused. The rear threaded 1.30 (33.0) Dimensions in inches (millimeters) Tolerances: 2 PL Dec ±0.02 (±0.51) 3 PL Dec ±0.010 (±0.254) Recommended panel cutout dimensions: 1.336 (33.93)W × 0.838 (21.29)H Internal corner radii 0.032 (0.81) Max. DMS-20PC-3-LM ® 0.04 (1.016) #6-32 UNC THD 0.44 (11.2) 0.80 (20.3) 0.32 (8.1) 0.75 (19.1) ISO 9001 and 14001 REGISTERED 0.04 (1.016) 0.88 (22.4) 1.38 (35.1) 0.37 (9.4) 1.00 (25.4) #2-56 INSERT 0.156 (3.96) DEEP Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ® 0.04 (1.016) 1.07 (27.2) DMS-BZL3-C Optional Bezel 0.10 (2.5) 1.63 (41.4) 0.19 (4.8) 1.28 (32.5) 0.10 (2.5) 1.83 (46.5) 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. © 2012 Murata Power Solutions, Inc. www.murata-ps.com/support MPM_DMS-20PC-3LM_D07 Page 2 of 2