DCA-20PC

DCA-20PC MURATA-PS | Alldatasheet

Document overview

• Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
• PDF pages: 6

Technical content

Figure 1. Simplified Schematic

FEATURES

n Built-in shunts for digitally measuring dc currents from 200uA to 20A n Functionally complete – no additional components required n Wide power supply inputs: 5 to 40Vdc for 5V/12/24V/28V applications 36-75V option for telecom supplies n 8-36Vdc Isolated-supply models for high-side shunts n 20mV internal shunt minimizes power loss n Includes load connections for easy 3 or 4-wire operation n High resolution; Factory calibrated to ±0.1% accuracy n Large, easy-to-read, LED display with 0.37” (9.4mm) high digits n Available with red, blue or green LED displays n Small 1.38˝ x 0.88˝ x 1.0˝ package Murata Power Solutions’ new DCA-20PC Series are the first digital dc ammeters to include built-in shunts for measuring dc currents up to 20A. Six ranges provide for precision measurement of dc currents from 200uA to 20A. These ammeters are 100% self-contained; no calibration or user-supplied components are required—they even include terminal blocks for your external load circuit, a feature that enables simple 3-wire operation! Two shunt-configurations are offered: grounded-shunt (“low side”), 5-40V-powered models for cost-sensitive applications, and 8-36V isolated-supply models for high side or floating shunt applications. A versatile power supply design accommodates all popular supply voltages from 5 to 75Vdc. Reverse-polarity-protected supply inputs ensure trouble free installation. And, because many dc ammeters are installed in battery backup applications, power consumption is typically below 1 Watt for 8-36V models, and below 75mW for 5-40V models. To further reduce overall power con- sumption, the voltage dropped across its built-in series shunt is only 20mV! DCA-20PC Series ammeters are housed in subminiature, 1.38˝ x 0.88˝ (35mm x 22mm), rugged packages that feature a large, 0.37˝/9.4mm high, LED display. A built-in, high-contrast color filter ensures that legibility is not compromised: the display can be easily read at distances up to 15 feet (5 meters). Available LED-display colors include brilliant blue, bright green, and standard red. Built-in shunts, Precision electronics, miniature size, wide power supply inputs, low power consumption, and no-hassle 3-wire installation make DCA-20PC Series the ideal choice for all your 200uA to 20A ammeter-applications. A/D CONVERTER LED DISPLAY INPUT AMPLIFIER POWER CONVERTER TB1 –5V +5V TB2 POWER GROUND SIGNAL GROUND Open on isolated-supply models Applies to isolated-supply models only –V+VLOAD (+)+SHUNT BUILT-IN SHUNT –SHUNT (–V) – + – + EXTERNAL LOAD EXTERNAL DC SUPPLY 1 2 2 31 2 1 2 www.murata-ps.com www.murata-ps.com/support For full details go to www.murata-ps.com/rohs DCA-20PC Series LED Display, Subminiature DC Ammeters with Built-In Shunts MPM_DCA-20PC.C01 Page 1 of 6

Performance/Functional Specifications Typical at TA = +25°C, unless otherwise noted. Input Range: Full-scale load current 1 = 199.9µA 2 = 1.999mA 3 = 19.99mA 4 = 199.9mA 5 = 1.999A 6 = 19.99A DCA-20PC - 1 - DC1 - R L - C Accessories: DMS-20-CP Panel Cutout Punch ➀ The noted full-scale values are the external load currents that the ammeter is designed to measure. This current enters TB-1 (-SHUNT), passes through the am- meter’s built-in shunt and exits via TB1-2 (+SHUNT). For all models, this same full- scale load current can also be routed, if the user so chooses, through TB2-1 and TB2-2 (connection to positive rail of power supply). See detailed wiring diagrams. Measuring positive and negative currents (bipolar operation): In applications where both positive and negative currents must be measured, Murata Power Solu- tions recommends using ‘-DC4’ 8-36V isolated supply models. Negative current flow is denoted by the illumination of the display’s negative (-) sign; the absence of a negative sign implies positive current flow. Contact MPS if you have any ques- tions regarding bipolar operation of DCA-20PC ammeters. ➀ For all models, the application of 1.5 times the rated full-scale load current is permissible as long as this overcurrent condition does not exceed 6 seconds and occurs no more than once in a 60 second interval (10% duty cycle). ➀ Breakdown (isolation) voltage applies only to ‘-DC4’ isolated-power models. Break- down voltage is tested with TB1-1 tied to TB1-2 (-SHUNT shorted to +SHUNT), and TB2-1, TB2-2, and TB2-3 all tied together (+V shorted to -V). 500Vdc is then applied between the two shorted terminal-block pairs; the maximum permissible leakage current is 5uA. ➀ Zero reading is measured with TB1-1 (-SHUNT) shorted to TB1-2 (+SHUNT). ➀ The Operating power supply voltage is applied to TB2-1-2 (+V) and TB2-3 (-V) on ‘-DC4’ models, and to TB1-1 (-SHUNT) and TB2-2 (+V) on ‘-DC1’ models. On all models, TB2-1 and TB2-2 are internally tied together (+V). Operating supply current is the current which powers the meter’s analog and digital circuits; it is measured with zero load-current passing through the ammeter’s built-in shunt (i.e., with the display reading “000” and one decimal point enabled). On 5-40Vdc powered (‘-DC1’), grounded-shunt models, the ammeter’s operating supply current enters TB1-1 (-Shunt) but is not included in the displayed reading (i.e., it does not pass through the built-in shunt). A DMS-BZL4-C bezel assembly with sealing gasket is supplied with each ammeter. Full Scale Load Current ➀ Min. Typ. Max. Units DCA-20PC-1 – – 199.9 µAdc DCA-20PC-2 – – 1.999 mAdc DCA-20PC-3 – – 19.99 mAdc DCA-20PC-4 – – 199.9 mAdc DCA-20PC-5 – – 1.999 Adc DCA-20PC-6 – – 19.99 Adc Overcurrent Rating (<6 sec.) ➀ 1.5x rated full-scale load current Internal Shunt Resistance DCA-20PC-1 – – 100 Ohms DCA-20PC-2 – – 10 Ohms DCA-20PC-3 – – 1.0 Ohm DCA-20PC-4 – – 0.1 Ohm DCA-20PC-5 – – 0.01 Ohm DCA-20PC-6 – – 0.001 Ohm Shunt Input to Power Supply Isolation ➀ DCA-20PC-X-DC4 models only 500 – – Volts Performance Sampling Rate 2.5 reading per second Accuracy ±0.15%FS Zero-Current Reading ➀ “–001” “000” “001” Counts Temperature Drift (0 = +60°C) – ±0.2 ±0.4 Cnts/°C Operating Supply Voltage (TB2 Terminals 1, 2 and 3) ➀ DCA-20PC-X-DC1-XX +5.0 – +40 Vdc DCA-20PC-X-DC4-XX +8 – +36 Vdc Operating Supply Current (TB2 Terminals 1, 2 and 3) ➀ DCA-20PC-X-DC1-XX (@ 5-40V) – 10 15 mAdc DCA-20PC-X-DC4-XX (@ 8V) – 100 150 mAdc DCA-20PC-X-DC4-XX (@ 36V) – 25 40 mAdc TB1 and TB2 Terminal Blocks Wire Size 12-20AWG, (solid) 14-20AWG, (stranded) copper wire Insulation Strip Length 0.250 inches Screw Tightening Torque 4.4 pound/inches (0.5Nm) Rated Current 20A with 12AWG solid copper wire; 15A with 14AWG solid or stranded copper wire Display Display Type and Size 3½ digit, 0.37"/9.4mm high red, blue or green LED Overrange Indication "–1_ _ _" for negative Vin "1_ _ _" for positive Vin Display Reading/Decimal Point Model dependent Physical/Environmental Operating Temperature 0 – +60 °C Storage Temperature –20 – +75 °C Add -C for RoHS

Ordering Information

Physical/Environmental (continued) Humidity (non-condensing) 0 – 85 % Case Material Polycarbonate Dimensions 1.38"W x 0.88" x 1.0" nominal Weight 0.6 ounces (17 grams) Power Supply: DC1 = +5-40Vdc, non-isolated power (available with -RL, -BL, or -PGL LEDs) DC4 = +8-36Vdc, isolated power (available with -RL, -BS, or -GS LEDs) LED Color: BL = Low-Power Blue BS = Super Blue GS = Standard Green PGL = Low-Power Green RL = Low-Power Red See www.murata.com/products/power for model-specific availability. www.murata-ps.com/support DCA-20PC Series LED Display, Subminiature DC Ammeters with Built-In Shunts MPM_DCA-20PC.C01 Page 2 of 6

MECHANICAL DIMENSIONS: Inches (mm) TOLERANCES: 2 PL DEC ±0.02 (±0.51) 3 PL DEC ±0.010 (±0.254) 0.80 (20.3) 0.88 (22.4) 1.30 (33.0) 0.040 (1.02) 1.04 (26.4) 0.475 (12.1) 0.040 (1.02) 1.38 (35.1) 1.42 (36.1) CAL 1 2TB2 1 2 TB1 CAL 1 2 3TB2 1 2TB1 FRONT VIEW ALL MODELS BACK VIEW DCA-20PC-X-DC4 MODELS –SHUNT DP1 DP2 DP3 SG1 SG2 SG3 SG1 SG2 SG3 –SHUNT +SHUNT +SHUNT+V –V+V BACK VIEW DCA-20PC-X-DC1 MODELS #2-56 INSERT 0.156 (3.96) DEEP FRONT VIEW 1.280 (32.51) 0.187 (4.75) DMS-BZL4 BEZEL 1.826 (46.38) 0.838 (21.29) 1.626 (41.30) 1.07 (27.18) INTERNAL CORNER RADII: 0.032 (0.81) MAX. 0.093 (2.362) DIAMETER (4 REQUIRED) ONLY WHEN USING SUPPLIED BEZEL ASSEMBLY 0.116 (2.95) MECHANICAL SPECIFICATIONS BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT 0.80 (20.3) 0.88 (22.4) 1.30 (33.0) 0.040 (1.02) 1.04 (26.4) 0.475 (12.1) 0.040 (1.02) 1.38 (35.1) 1.42 (36.1) CAL 1 2TB2 1 2 TB1 CAL 1 2 3TB2 1 2TB1 FRONT VIEW ALL MODELS BACK VIEW DCA-20PC-X-DC4 MODELS –SHUNT DP1 DP2 DP3 SG1 SG2 SG3 SG1 SG2 SG3 –SHUNT +SHUNT +SHUNT+V –V+V BACK VIEW DCA-20PC-X-DC1 MODELS www.murata-ps.com/support 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. © 2023 Murata Power Solutions, Inc. Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/ DCA-20PC Series LED Display, Subminiature DC Ammeters with Built-In Shunts MPM_DCA-20PC.C01 Page 6 of 6