DCA5-20PC Series www.murata-ps.com 50mV & 100mV Input, LED-Display, Subminiature DC Ammeters 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 Murata Power Solution's new DCA5-20PC Series dc ammeters are specifically designed to display 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 packages that feature a large, 0.37"/9.4mm high, LED display. However, display visibility is not compromised 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 flexibility, computer-style jumpers are provided for range-specific decimal point assignments. And, to ensure trouble free installation, all models include reverse-polarity protected power supply inputs. Two input configurations 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 floating 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. LED DISPLAY + INPUT AMPLIFIER +5V CAL * - A/D CONVERTER POWER CONVERTER -5V ** 1 2 POWER GROUND 1 SIGNAL GROUND 1 2 2 TB2 TB1 -IN +IN -V (GND) +V * Not included on all models ** Open on isolated power models + For full details go to www.murata-ps.com/rohs - EXTERNAL DC SUPPLY EXTERNAL 50 or 100mV SHUNT Figure 1. DCA5-20PC Series Simplified Schematic www.murata-ps.com/support MPM_DCA5-20PC.B09 Page 1 of 6 DCA5-20PC Series 50mV & 100mV Input, LED-Display, Subminiature DC Ammeters Performance/Functional Specifications Typical at TA = +25C, unless otherwise noted. Input (TB1) Min. Typ. Max. Units Full Scale Input 49.5 50 50.5 mV Overvoltage Rating 400 - - mV - 1K - Ohms - - Vdc Input Impedance Shunt Input to Power Supply Isolation DCA-20PC-X-DC4 models only 500 Performance Sampling Rate 2.5 reading per second Accuracy Zero-Current Reading 0.15%FS "-001" "000" "001" Counts - 0.2 0.4 Cnts/C DCA-20PC-X-DC1-XX +5.0 - +40 Vdc DCA-20PC-X-DC4-XX +8 - +36 Vdc - 10 15 mAdc DCA-20PC-X-DC4-XX (@ 8V) - 100 150 mAdc DCA-20PC-X-DC4-XX (@ 36V) - 25 40 mAdc Temperature Drift (0 = +60C) Power Supply Voltage (TB2) Power Supply Current DCA-20PC-X-DC1-XX (@ 5-40V) TB1 and TB2 Terminal Blocks Wire Size 16-22AWG, solid or stranded Insulation Strip Length 0.250 inches Screw Tightening Torque Rated Current 2.2 lb*in (0.25 N*m) 20% 20A with 12AWG solid copper wire; 15A with 14AWG solid or stranded copper wire Display Display Type and Size 31/2 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 Storage Temperature Humidity (non-condensing) Case Material Dimensions Weight 0 - +60 C -20 - +75 C 0 - 85 % Polycarbonate 1.38"W x 0.88" x 1.0" nominal 0.6 ounces (17 grams) 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 Solutions 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 questions regarding bipolar operation of DCA5-20PC ammeters. Ordering Information DCA5-20PC - x - DC1 - R L - C Add -C for RoHS LED Color: BL = Low-Power Blue BS = Super Blue Power Supply: GS = Standard Green DC1 = +5-40Vdc, non-isolated power PGL = Low-Power Green (available with -RL, -BL, or -PGL LEDs) RL = Low-Power Red DC4 = +8-36Vdc, isolated power (available with -RL, -BS, or -GS LEDs) Input Range: Use with these 50mV shunts* 1 5A 50A 500A 2 1A 10A 100A 1000A 3 30A 300A 4 75A 750A 5 15A 150A 1500A 6 2A 20A 200A 2000A 7 25A 250A 8 400A 9 600A 10 80A 800A 11 1200A or with these 100mV shunts* 10A 100A 1000A 2A 20A 200A 2000A 60A 600A 15A 150A 1500A -- -- 5A 50A 500A 80A 800A 120A 1200A -- -- *With respective decimal point user enabled. See technical note 7. Accessories: DMS-20-CP Shunt Model 3020-01097-0 3020-01107-0 3020-01098-0 3020-01096-0 3020-01099-0 3020-01108-0 3020-01100-0 3020-01101-0 3020-01102-0 3020-01103-0 3020-01104-0 3020-01105-0 3020-01106-0 Panel Cutout Punch Rating 5A/50mV 10A/100mV 20A/50mV 50A/50mV 100A/50mV 100A/100mV 150A/50mV 200A/50mV 300A/50mV 500A/50mV 800A/50mV 1000A/50mV 1200A/50mV Use with DCA5-20PC-1 DCA5-20PC-1 DCA5-20PC-6 DCA5-20PC-1 DCA5-20PC-2 DCA5-20PC-1 DCA5-20PC-5 DCA5-20PC-6 DCA5-20PC-3 DCA5-20PC-1 DCA5-20PC-10 DCA5-20PC-2 DCA5-20PC-11 A DMS-BZL4-C bezel assembly with sealing gasket is supplied with each ammeter. On non-isolated `-DC1' models, continuous application of single-ended 400mV inputs will not damage the ammeter. Single-ended inputs are defined 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. 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. Zero reading is measured with TB1-1 (-IN) shorted to TB1-2 (+IN). Power supply currents noted are measured with the 50mV shunt input (TB1) at zero volts (display reads "000") and one decimal point enabled. Each model's full-scale display reading with a 50.0mV input is designated by the first 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. www.murata-ps.com/support MPM_DCA5-20PC.B09 Page 2 of 6 DCA5-20PC Series 50mV & 100mV Input, LED-Display, Subminiature DC Ammeters TECHNICAL NOTES DCA5-20PC-X-DC1-XX To ensure safe and reliable operation, DCA5-20PC dc ammeters must only be installed and serviced by qualified technical personnel. DC ammeter applications can expose a user to potentially lethal currents and voltages. Power and signal connections must be made with all associated power sources de-energized. Contact DATEL if you have any questions regarding the installation or operation of any of our digital instruments. 1. Calibration: DCA5-20PC ammeters are designed to operate with 50mV and 100mV dc shunts whose rated accuracy is 0.25%, or better. The output of less accurate shunts may fall outside the ammeter's 1% calibration adjustment range. Under normal indoor operating conditions, periodic recalibration of DCA5-20PC ammeters is not necessary. The calibration potentiometer, located on the back of the ammeter, is a 3/4 turn type; do not force its adjustment screw past the two end stops. If user calibration is deemed necessary, it must be performed by qualified personnel. Calibration is performed by applying a precision 50.00mVdc or 100mVdc (model specific, see ordering guide) signal to TB1, observing correct polarity. Then, using an insulated slotted tool, adjust the calibration potentiometer until the correct display reading is achieved. Contact MPS if additional information is required regarding calibration or setup of DCA520PC ammeters. 1 1 1 1 2 2 2 3 1 TB1 -IN 1 TB2 2 2 +IN +V 4. High-Side versus Low-Side Shunts: Incorrect shunt connections are one of the most common problems encountered when applying digital dc-ammeters. Incorrect shunt connections can cause permanent damage to the ammeter and/or its associated equipment. Low-Side Shunts: Applications that employ a single power supply to power both the load and the ammeter, and the external shunt is located in the negative side of the supply (commonly referred to as "low side" or "grounded shunt") should use `-DC1' non-isolated power DCA5-20PC Series ammeters. Figures 2, 3, and 4 depict typical low-side shunt connections. High-Side Shunts: `-DC4' isolated-power ammeters must be used in all applications that employ a single power supply to power both the load and the ammeter and the shunt is located in the high side (positive terminal) of the supply. Figures 5 and 6 depict typical high-side shunt connections. As shown in Figure 6, isolated-power models can also be used in applications -V SHUNT MUST BE IN LOW SIDE + LOAD DC SUPPLY 5-40Vdc - 50mV SHUNT POWER GROUND (0Vdc) LOAD CURRENT Figure 2. Low-Side Shunt Connections for "-DC1" 5-40Vdc Non-Isolated Supply Models DCA5-20PC-X-DC1-XX 1 J3 CAL J1 J2 1 1 1 2 2 2 3 1 TB1 -IN REMOVE J3 FOR 36-75Vdc SUPPLIES 1 TB2 2 2 +IN +V -V SHUNT MUST BE IN LOW SIDE LOAD 50mV SHUNT 3. Terminal Block Torque Ratings: It is important to tighten TB1's and TB2's screw-terminals to their rated torque specifications of 3.6 pound-inches (0.4Nm). Proper tightening will minimize losses and ensure reliable operation. J3 MUST BE INSTALLED (FACTORY SETTING) FOR 5-40Vdc SUPPLIES J1 AND J2 POSITIONS DEPEND ON INPUT RANGE 2. Wiring and Fusing: Power supply (TB2) and input (TB1) wiring must be rated for the electrical and environmental conditions under which the ammeters will be operated. They must also comply with any regulatory or application-mandated requirements pertaining to the user's installation. Connections to DCA5-20PC ammeters must be made with all power sources de-energized. Refer to the Functional Specifications section for TB1 and TB2 wire gauge information. DCA5-20PC ammeters' shunt (TB1) and power supply inputs (TB2) are not internally fused. Therefore, the supply wires connected to the meter and the load should be fused according to the maximum current rating (or lower) of the wire gauge used, in accordance with applicable regulatory codes. Insulation should be stripped to within +/-10% of the stated dimensions. All wires must be inserted into the terminal block openings such that the screw terminal does not pinch any insulation. TB2 is to be used solely for powering the meter's internal circuitry; it must not be used to supply current to an external load or auxiliary device. J1 J2 J3 CAL LOAD CURRENT + DC SUPPLY 36-75Vdc - POWER GROUND (0Vdc) Figure 3. Low-Side Shunt Connections for "-DC1" Models Modified for 36-75Vdc Non-Isolated Power (See Technical Note 5) where one supply powers the ammeter and a second supply powers the load, but the two supply grounds cannot be tied together. `-DC4' isolatedsupply models include a built-in dc/dc converter to provide a minimum of 500Vdc isolation between the shunt (TB1) and power supply inputs (TB2). 5. Operation With 36 to 75Vdc Power: As shipped, all `-DC1' models' rated operating supply range is +5 to +40Vdc. However, `-DC1' models can be user configured for 36 to 75Vdc operation by removing (opening) jumper J3. Please note that this user modification can only be performed on `-DC1 power models. Also, all `-DC1' models - including those that have been modified for 36-75Vdc operation - can only be connected in low-side, grounded-shunt applications. See Figure 3 for detailed wiring information. www.murata-ps.com/support MPM_DCA5-20PC.B09 Page 3 of 6 DCA5-20PC Series 50mV & 100mV Input, LED-Display, Subminiature DC Ammeters APPLICATIONS Any reconfiguration of J3 must be made prior to connecting the power supply and shunt to the ammeter. 6. Replacing Analog Panel Meters: DCA5-20PC ammeters can be used as replacements for analog panel meters that are driven by 50 or 100mV shunts, if a suitable dc voltage is available for powering the ammeter. In retrofit applications, it is extremely important to determine the shunt's electrical configuration (i.e., high or low side). If any doubt exists as to the shunt's location, use only `-DC4' isolated-supply models. Rewiring must be performed with all power sources de-energized. 7. Decimal Point Selection: As shown in the Ordering Information guide, DCA520PC ammeters are multiple input-range devices. For example, with a 50mV input, DCA5-20PC-1-DC1 models can be configured to display "5.00", "50.0, or "500" Amps by simply removing or relocating decimal-point-selector jumper J2 (see Figure 7). Decimal points serve as placeholders only; they have no affect on displayed accuracy or resolution. If jumper J2 is not available, solder gaps SG1, SG2, or SG3 can be used to select DP1 ("1.XXX"), DP2 ("1X.XX"), or DP3 ("1XX.X"), respectively. DCA5-20PC-X-DC1-XX 1 1 J3 J1 J2 J1 J2 J3 CAL 1 1 1 2 2 2 CAL 1 1 2 2 3 3 J3 MUST BE INSTALLED (FACTORY SETTING) FOR 5-40Vdc SUPPLIES J1 AND J2 POSITIONS DEPEND ON INPUT RANGE 1 TB1 1 TB1 1 TB2 2 2 1 TB2 2 2 M1 -IN +IN +V -V -IN +IN +V + SHUNT CAN BE IN LOW OR HIGH SIDE DISCHARGE - 12 V BATTERY DC SUPPLY #1 8-36Vdc + + 50mV SHUNT 50mV SHUNT CHARGE DC SUPPLY #2 LOAD - - + SOLAR PANELS - LOAD CURRENT + LOADS -V - Figure 4. Typical Low-Side Shunt Connections for "-DC1" Models Measuring a Battery's Charge/Discharge Current Figure 6. Using "-DC4" Isolated-Power Models to Maintain Isolation Between Two Power Supplies ALL MODELS J2 CONFIGURATION 1 1 1 2 3 J3 J1 J2 CAL J3 1 1 2 2 CAL 3 DP2 OFF DP3 OFF J1 J2 1 1 1 2 2 2 3 SG3 SG2 1 2 3 DP2 ON (1X.XX) SG1 1 2 DP3 ON (1XX.X) 3 1 TB1 1 TB2 2 2 1 TB1 2 1 TB2 2 J1 CONFIGURATION M1 1 2 -IN +IN +V -V 1 2 + DC SUPPLY 8-36Vdc DP1 OFF DP1 ON (1.XXX) - 50mV SHUNT LOAD CURRENT Figure 7. Decimal Point Selection Using J2 and J1 (Applies to All Models) POWER GROUND (0Vdc) LOAD Figure 5. High-Side Shunt Connections for "-DC4" 8-36Vdc Isolated-Power Models www.murata-ps.com/support MPM_DCA5-20PC.B09 Page 4 of 6 DCA5-20PC Series 50mV & 100mV Input, LED-Display, Subminiature DC Ammeters APPLICATIONS 20PC's sensitive circuitry. The amplified noise introduces errors that are particularly noticeable at zero load current (i.e., the ammeter may not display a relatively steady "000" reading). 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, DATEL 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.datel.com. 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. Table 1. 100mV Shunt Readings * Model 100mV Shunt Readings 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). DCA5-20PC-1 10.00A/100.0A/1000A DCA5-20PC-2 1.999A/19.99A/199.9A/1999A DCA5-20PC-3 60.0A/600A 9. Noisy Power Supplies: Some power supplies contain high-frequency switching devices that may conduct and/or radiate significant noise onto the low-level 50/100mV shunt signal. Even though the DCA520PC incorporates built-in filtering at its shunt input, some portion of this noise may be amplified and subsequently measured by the DCA5- DCA5-20PC-4 150.0A/1500A DCA5-20PC-7 50.0A/500A DCA5-20PC-8 800A DCA5-20PC-9 1200A * With respective decimal point enabled PANEL INSTALLATION All connections and modifications 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 Step 1. 1 Step 2. 1"/&- ammeter. See the Mechanical Specifications section for detailed panel cutout and ammeter dimensions. Following the four-step sequence shown in Figure 8 below, being careful not to apply excessive force or twisting motions, insert the ammeter into the panel opening. When using the DMS-BZL4-C's sealing gasket, make sure it is positioned between the ammeter's flange and the panel's front surface. Be sure to use and securely tighten all four screws supplied with the bezel assembly. Step 3. 1"/&- Step 4. 3 1"/&- #&;&- 1"/&- 2 4 ("4,&5 PQUJPOBM Figure 8. Panel Installation www.murata-ps.com/support MPM_DCA5-20PC.B09 Page 5 of 6 DCA5-20PC Series 50mV & 100mV Input, LED-Display, Subminiature DC Ammeters MECHANICAL SPECIFICATIONS 0.475 (12.1) MECHANICAL DIMENSIONS: Inches (mm) TOLERANCES: 2 PL DEC 0.02 (0.51) 3 PL DEC 0.010 (0.254) 0.040 (1.02) 1.30 (33.0) 1.38 (35.1) 1.00 (25.4) 0.040 (1.02) 0.80 (20.3) 0.88 (22.4) 1.42 (36.1) FRONT VIEW BACK VIEW 1 J3 CAL J1 J2 1 1 1 2 2 2 3 1 TB1 DP1 DP2 SG3 SG2 SG1 1 TB2 2 2 DP3 -IN +IN +V -V BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT DMS-BZL4 BEZEL #2-56 INSERT 0.156 (3.96) DEEP RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS 0.187 (4.75) FRONT VIEW INTERNAL CORNER RADII: 0.032 (0.81) MAX. 1.280 (32.51) 1.07 (27.18) 0.116 (2.95) 0.838 (21.29) 1.336 (33.93) 0.145 (3.68) 1.826 (46.38) 1.626 (41.30) 0.093 (2.362) DIAMETER (4 REQUIRED) ONLY WHEN USING SUPPLIED BEZEL ASSEMBLY Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED 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. (c) 2013 Murata Power Solutions, Inc. www.murata-ps.com/support MPM_DCA5-20PC.B09 Page 6 of 6