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DMS-20PC-9-DCM www.murata-ps.com 380V, Self-Powered, LED-Display DC Voltage Monitor FEATURES Self-powered, requires only two connections 160 to 430Vdc measurement range Ideal for 380V DC power distribution systems Digital replacement for analog panel meters DATEL's DMS-20PC-9-DCM self-powered, high voltage DC monitors are specifically designed to measure and display voltages in 380V DC power-distribution systems or battery banks. Simply connect any 160 to 430Vdc source across its rear terminals and the meters are fully operational—no additional components or power supplies are required. Large, easy-to-read, bright red LED display Screw-style terminal connections simplify installation Rugged silicone-encapsulated plastic package Their large, 0.37"/9.4mm, red LED display can be easily read from 15 feet away (5 meters). These meters accurately display dc bus voltages with 1Vdc resolution. Built-in reverse polarity protection assures simple, trouble-free installation. All DMS-20PC-9-DCMs employ a 3½ digit A/D converter and precision metal-film resistors to achieve outstanding performance over an operating temperature range of –25 to +60°C. Reverse polarity protected to –430Vdc Functional Specifications Input Voltage Range ➀ Current Consumption @Vin = 430Vdc Reverse Polarity Protection Performance Sampling Rate Resolution Accuracy @ +25°C Temperature Drift (–25 to +60°C) Mechanical Dimensions Display Type Weight Case Material 6-32 screw torque Environmental Operating Temperature Storage Temperature Humidity (Non-condensing) +160 to +430Vdc 3mA (max.) -430Vdc (max.) The meter’s electronics are housed in an encapsulated, polycarbonate case that also provides excellent protection against moisture, shock, and vibration. The DMS-20PC-9-DCM is designed to fit in the same panel cutout as many of DATEL's AC and DC voltage monitors and AC and DC ammeters; all of your voltage and current monitoring instrumentation can now be sourced from one supplier. 2.5 readings/second 1Vdc ±1V (typ.), ±2V (max.) ±0.4 V/°C (max.) Typical panel mount installation and suggested wiring (user supplied) 1.38" x 0.88" x 1.00" 3 digit, red LED, 0.37"/9.4mm 1 ounce (28 grams) Polycarbonate 6-8 in-lbs (0.7 – 0.9N-m) Ordering Information –25 to +60°C –40 to +75°C 0 to 85% DMS-20PC-9-DCM-C 160 to 430V DC voltage monitor (Red LED) DMS-BZL4-C Optional panel mount bezel with sealing gasket DMS-20-CP Panel cutout punch Note: Brass screws (6-32 thread) and a panel-mount retaining clip are supplied with each meter. The ‘-C’ suffix denotes RoHS compliance. ➀ Operation and accuracy at inputs above or below this range are not specified. TECHNICAL NOTES ! IMPORTANT! To ensure safe and reliable operation, DMS-20PC-9-DCM high voltage monitors must be installed and serviced by qualified technical personnel. Contact Murata Power Solutions if there is any doubt regarding installation or operation. 1. Measurement Type: DMS-20PC-9-DCM AC voltmeters employ a precision analog-todigital converter and a stable voltage reference to measure and display voltages from +160Vdc to +430Vdc. 2. Calibration: DMS-20PC-9-DCM voltmeters are factory calibrated; there is no provision for calibrating units in the field. For full details go to www.murata-ps.com/rohs 3. Panel Installation: All electrical connections to DMS-20PC-9-DCM must be made after the voltmeter is securely attached to the panel, and with the input DC supply de-energized (off). In high-vibration environments, adequate strain reliefs must be used on all supply wiring. While the supplied brass retaining clip is adequate for most installations, the DMS-BZL4-C optional bezel assembly is recommended for demanding environmental installations. (Continued on next page.) www.murata-ps.com/support MPM_DMS-20PC-9-DCM.A01 Page 1 of 2 DMS-20PC-9-DCM 380V, Self-Powered, LED-Display DC Voltage Monitor TECHNICAL NOTES, CONT. 4. Power Supply Fusing and Wiring: DMS-20PC-9-DCM DC voltmeters are not internally fused. The supply wires connected to its input terminals must be fused with a 0.25A/600V time delay/time lag fuse, in accordance with applicable regulatory codes. All 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 hook-up wire suitable for the intended application is required. The rear threaded standoff input-terminals are to be used only for powering the meter’s internal circuitry; they must not be used to supply power to external loads. The recommended supply wire size is 18AWG to 22AWG (0.83mm2 to 0.325mm2) solid or stranded copper wire. The supply wires must be properly stripped and attached to the meter’s rear terminals such that their insulation is not pinched by the screw terminal. Recommended insulation strip length is 0.60" (15.2mm). MECHANICAL SPECIFICATIONS 1.30 (33.0) – + DMS-20PC-9-DCM ® ® 0.04 (1.016) 0.04 (1.016) #6-32 UNC THD 0.44 (11.2) 0.80 (20.3) 0.32 (8.1) + – 0.75 (19.1) 0.88 (22.4) 1.07 (27.2) DMS-BZL4-C Optional Bezel 0.10 (2.5) 1.63 (41.4) Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED 1.38 (35.1) 0.37 (9.4) 1.00 (25.4) #2-56 INSERT 0.156 (3.96) DEEP 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. 0.04 (1.016) 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. © 2013 Murata Power Solutions, Inc. www.murata-ps.com/support MPM_DMS-20PC-9-DCM.A01 Page 2 of 2