DCA5-20PC MURATA-PS | Alldatasheet
Document overview
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Technical content
Murata Power Solutions’ new DCA5-20PC Series dc ammeters are specifi cally designed to dis- play the output of all popular 50mV and 100mV dc-shunts. 25 input ranges provide for precision measurement of dc currents from 1.000A to 2000A. With the exception of an external shunt, the unit is 100% self-contained – no calibration or user-supplied components are required. Available LED-display colors include brilliant blue, bright green, and standard red. Three power supply options accommodate all popular dc-supply voltages from 5V to 75Vdc, making these ammeters perfect for automotive, industrial, telecom, and marine applications! DCA5-20PC Series ammeters are housed in 1.38” x 0.88” (35mm x 22mm) rugged pack- ages that feature a large, 0.37”/9.4mm high, LED display. However, display visibility is not com- promised in any way: the display can be easily read at distances up to 15 feet (5 meters). All input and power supply connections are made by way of two screw-style terminal blocks. For added fl exibility, computer-style jumpers are provided for range-specifi c decimal point assign- ments. And, to ensure trouble free installation, all models include reverse-polarity protected power supply inputs. Two input confi gurations are offered: grounded shunt (“low-side”), 5-40V-powered, red, green or blue LED models for cost-sensitive applications, and 8-36V isolated-supply models that accept high-side or fl oating shunts. Isolated-supply models are also available in a choice of red, green, or blue LEDs. Since many dc ammeters are used in battery backup applications, power consumption for 8-36V models is typically 1 Watt, and 75mW for 5-40V models. Miniature size, wide supply inputs, and no-hassles installation make DCA5-20PC Series ammeters the ideal choice for all your 50 and 100mV shunt ammeter-applications. Figure 1. DCA5-20PC Series Simplifi ed Schematic
FEATURES
Scales and displays the output of 5A to 2000A, 50mV & 100mV shunts Completely self-contained – no additional components required Wide power supply inputs: 5 to 40Vdc for 12V/24V/28V applications 48V option for telecom supplies Isolated-supply models for high-side shunts Large, easy-to-read LED display with 0.37” (9.4mm) high digits Available in red, blue or green LED displays Subminiature 1.38” x 0.88” package with screw-style terminal blocks Factory calibrated to ±0.1% accuracy; Reverse-polarity protection Over 50 models available Digital upgrade for analog meters www.murata-ps.com www.murata-ps.com/support For full details go to www.murata-ps.com/rohs Ḥ DCA5-20PC Series 50mV & 100mV Input, LED-Display, Subminiature DC Ammeters MPM_DCA5-20PC.C01 Page 1 of 6
➀ A full-scale input voltage of 50.00mV is used to calibrate all models for their designated measurement range. The ammeter’s rear calibration potentiometer compensates for full-scale input variations up to ±1% (49.5 to 50.5mV). 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 fl ow is denoted by the illumination of the display’s negative (–) sign; the absence of a negative sign implies positive current fl ow. Contact MPS if you have any questions regarding bipolar operation of DCA5-20PC ammeters. ➁ On non-isolated ‘-DC1’ models, continuous application of single-ended ±400mV inputs will not damage the ammeter. Single-ended inputs are defi ned as those whose TB1-1 (–IN) potential is within ±0.1V of the potential on TB2-2 (-V). For all models, the application of short-duration (5 seconds max.) ±1V inputs will not damage the ammeter. ➂ Breakdown (isolation) voltage applies only to ‘-DC4’ isolated-power models. Breakdown voltage is tested with TB1-1 tied to TB1-2 (–IN shorted to +IN) and TB2-1 tied to TB2-2 (+V shorted to -V). 500Vdc is then applied between the two shorted terminal-block pairs; the max. allowable leakage current is 5uA. ➃ Zero reading is measured with TB1-1 (–IN) shorted to TB1-2 (+IN). ➄ Power supply currents noted are measured with the 50mV shunt input (TB1) at zero volts (display reads “000”) and one decimal point enabled. ➅ Each model’s full-scale display reading with a 50.0mV input is designated by the fi rst X in the DCA5-20PC-X-XXX model number structure. Decimal point selection (DP1, DP2, DP3, or none) is performed by the user to suit desired amperage range. Input ranges -1, -2, -3, -4, -7, -8 and -9 can accommodate 100mV shunts. For these ranges, the indicated 50mV reading is doubled when a 100mV input is applied. Performance/Functional Specifi cations Typical at TA = +25°C, unless otherwise noted. DCA5-20PC - x - DC1 - R L - C 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 Accessories: DMS-20-CP Panel Cutout Punch A DMS-BZL4-C bezel assembly with sealing gasket is supplied with each ammeter. Shunt Model Rating Use with 3020-01097-0 5A/50mV DCA5-20PC- 1 3020-01107-0 10A/100mV DCA5-20PC- 1 3020-01098-0 20A/50mV DCA5-20PC- 6 3020-01096-0 50A/50mV DCA5-20PC- 1 3020-01099-0 100A/50mV DCA5-20PC- 2 3020-01108-0 100A/100mV DCA5-20PC- 1 3020-01100-0 150A/50mV DCA5-20PC- 5 3020-01101-0 200A/50mV DCA5-20PC- 6 3020-01102-0 300A/50mV DCA5-20PC- 3 3020-01103-0 500A/50mV DCA5-20PC- 1 3020-01104-0 800A/50mV DCA5-20PC- 10 3020-01105-0 1000A/50mV DCA5-20PC- 2 3020-01106-0 1200A/50mV DCA5-20PC- 11 Input (TB1) ➀ Min. Typ. Max. Units Full Scale Input ➀ 49.5 50 50.5 mV Overvoltage Rating ➁ ±400 – – mV Input Impedance – 1K – Ohms Shunt Input to Power Supply Isolation ➂ DCA-20PC-X-DC4 models only 500 – – Vdc Performance Sampling Rate 2.5 reading per second Accuracy ±0.15%FS Zero-Current Reading ➃ “–001” “000” “001” Counts Temperature Drift (0 = +60°C) – ±0.2 ±0.4 Cnts/°C Power Supply Voltage (TB2) DCA-20PC-X-DC1-XX +5.0 – +40 Vdc DCA-20PC-X-DC4-XX +8 – +36 Vdc Power Supply Current ➄ 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 16-22AWG, solid or stranded Insulation Strip Length 0.250 inches Screw Tightening Torque 2.2 lb·in (0.25 N·m) ±20% 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 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)
Ordering Information
Use with these 50mV shunts* or with these 100mV shunts* 1 5A 50A 500A 10A 100A 1000A 2 1A 10A 100A 1000A 2A 20A 200A 2000A 3 30A 300A 60A 600A 4 75A 750A 15A 150A 1500A 5 15A 150A 1500A — 6 2A 20A 200A 2000A — 7 25A 250A 5A 50A 500A 8 400A 80A 800A 9 600A 120A 1200A 10 80A 800A — 11 1200A — *With respective decimal point user enabled. See technical note 7. Input Range: See www.murata-ps.com/dpm-availability for model-specifi c availability. www.murata-ps.com/support DCA5-20PC Series 50mV & 100mV Input, LED-Display, Subminiature DC Ammeters MPM_DCA5-20PC.C01 Page 2 of 6
APPLICATIONS
Step 1. Step 2. Step 3. Step 4. 8. Operation With 100mV Shunts: Many DCA5-20PC Series ammeters can also operate with 100mV shunts. This is due to the fact that when they are driven by a 100mV input, the display readings are double those of a 50mV input. However, a 50mV shunt cannot be used in a 100mV application because its maximum current rating will be exceeded. For our customer’s convenience, Murata Power Solutions offers a series of 50mV and 100mV chassis-mount dc shunts that can be used with DCA5-20PC ammeters. Part numbers for accessory shunts can be found in the Ordering Information section. A data sheet describing these shunts is available at www.murata-ps.com. Table 1 indicates the obtainable readings of the seven DCA5-20PC models that can be operated with 100mV shunts. Be sure to enable the correct decimal point (see decimal point selection instructions). 9. Noisy Power Supplies: Some power supplies contain high-frequency switching devices that may conduct and/or radiate signifi cant noise onto the low-level 50/100mV shunt signal. Even though the DCA5- 20PC incorporates built-in fi ltering at its shunt input, some portion of this noise may be amplifi ed and subsequently measured by the DCA5- All connections and modifi cations must be made after the ammeter is securely attached to the panel, with all load and supply voltages de-energized (off). The installed wire-positions should be such that minimal forces are applied to TB1, TB2, and the ammeter itself. In high-vibration environments, the use of wiring strain-reliefs is recommended. To insure a secure panel-mount installation, MPS recommends using the DMS-BZL4-C (with sealing gasket) bezel assembly supplied with each 20PC’s sensitive circuitry. The amplifi ed noise introduces errors that are particularly noticeable at zero load current (i.e., the ammeter may not display a relatively steady “000” reading). Connecting an external, unpolarized capacitor across TB1’s “+” and “–” inputs, and/or across the shunt’s 50mV output terminals, can help reduce noise-related display errors. In certain situations, the use of twisted pair or shield wiring may be required. As a general rule, avoid using excessively long leads between the ammeter and the shunt. Figure 8. Panel Installation cutout and ammeter dimensions. Table 1. 100mV Shunt Readings *
#2-56 INSERT 0.156 (3.96) DEEP FRONT VIEW 1.280 (32.51) 0.187 (4.75) DMS-BZL4 BEZEL RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS 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 DIMENSIONS: Inches (mm) TOLERANCES: 2 PL DEC ±0.02 (±0.51) 3 PL DEC ±0.010 (±0.254) 1 1 22 CAL TB1 TB2 J1 J2J3 1 1 2 2 SG3 SG2 SG1 0.80 (20.3) 0.88 (22.4) 1.30 (33.0) 0.040 (1.02) 1.00 (25.4) 0.475 (12.1) 0.040 (1.02) 1.38 (35.1) 1.42 (36.1) FRONT VIEW BACK VIEW –IN DP2DP1 DP3 +IN +V –V MECHANICAL SPECIFICATIONS BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT 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. Specifi cations are subject to change without notice. © 2015 Murata Power Solutions, Inc. Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfi eld, 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/ DCA5-20PC Series 50mV & 100mV Input, LED-Display, Subminiature DC Ammeters MPM_DCA5-20PC.C01 Page 6 of 6