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| ACA-20PC Series Digital, LED-Display AC Ammeters with Built-in Current Transformers Now with vailable Ts A Lead C Wire FEATURES Built-in Current Transformers for direct measurement of 0 to 2/20/50/100 Amps Functionally complete: On-board current transformers Scaling/interface circuitry Precision A/D converters Bright red LED displays 8 different models Subminiature, 1.38" x 0.88" package Easy-to-read, 0.37"/9.4mm digits AC powered models 85-264Vac @ 50/60Hz "Self-powered" 85-264Vac, 2A and 20A models feature built-in load connections +5-40V dc powered models 2000V isolation; UL/CSA recognized DATEL's new ACA-20PC Series are the first digital ac ammeters to incorporate on-board current transformers (CT's), and they are amazingly easy to use. Simply pass the current-carrying load wire through the ACA-20PC's on-board CT, apply power to the meter's two supply terminals, and you're instantly measuring ac currents over one of four ranges (0-2A with 1mA resolution, 0-20A with 10mA resolution, or 0-50A and 0-100A with 100mA resolution). Absolutely no external components, such as expensive low-value shunts or 5A "donut" CT's, are required. Meters are ac powered (120/220Vac @ 50/60Hz) or dc powered (+5-40V) and impose minimal loads (50mA max. and 120mA max., respectively) on their supplies. All models employ auto-zeroing circuits, precision bandgap references, and super stable thin-film resistors for unsurpassed accuracy (0.15%FS) and stability. The functionally complete ACA-20PC ammeters provide all the scaling/interface circuitry to mate the CT's output to a precision (31/2 digit) A/D converter. The A/D's output goes directly to drivers for the meters' large (0.37"/9.4mm digit height), easy-to-read, LED displays. AC-powered units have on-board AC/DC converters, and wide-range dc-powered units have on-board linear regulators. AC-powered models can be powered by the same ac supply whose current they are monitoring. The 2A and 20A, 85-264Vac, 50/60Hz ("AC1") models feature additional on-board terminal blocks to supply power to the external load. All models provide 2000Vdc isolation between the measured ac current and their power supply, and all are UL/CSA recognized. Each meter is housed in a subminiature, 1.38" x 0.88", epoxy-encapsulated package. Total behind-the-panel installation depth is approximately 2 inches. SIMPLIFIED SCHEMATIC DIAGRAM CAL. + 31/2 DIGIT A/D CONVERTER - +V RMS-to-DC CONVERTER -V LED DISPLAY (L1) POWER CONVERTER BUILT-IN CURRENT TRANSFORMER A B TB1 Figure 1. ACA-20PC Series simplified schematic For full details go to www.murata-ps.com/rohs MEASURED AC LOAD CURRENT AC INPUT POWER www.murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 MPM_ACA_20PC.B05 Page 1 of 6 ACA-20PC Series Performance/Functional Specifications Typical at TA = +25C, unless otherwise noted. Full-Scale Current (45-450Hz) ACA-20PC-1-XXX-XX ACA-20PC-2-XXX-XX ACA-20PC-3-XXX-XX ACA-20PC-4-XXX-XX DMS-30798-C Overcurrent Rating Performance Sampling Rate Accuracy Measurement Type Temperature Drift (0 = +60C) Zero Reading (Vin = 0 Volts) Dielectric Withstanding Voltage Power Supply Voltage ACA-20PC-X-AC1-RL (47-99Hz) ACA-20PC-X-DC1-RL Power Supply Current ACA-20PC-X-AC1-RL (47-99Hz) ACA-20PC-X-DC1-RL Power Supply Terminal Block ACA-20PC-1-AC1-RL and ACA-20PC-2-AC1-RL (2A and 20A ac-powered models with 4-position terminal blocks): Wire Size and Type Insulation Strip Length Screw Tightening Torque Maximum Rated Current Maximum Rated Voltage 12-20AWG (solid), 14-20AWG (stranded) 0.25 inches 4.4 pounds/inches (0.5Nm) 20A with 12AWG solid wire; 15A with 14AWG solid or stranded wire 630V (VDE 0110-V. Group 2) 250V (VDE 0110-V Group 3) - - 30 +8 50 +12 mA mAdc 85 +4.75 120 - 264 +40 Vac Vdc 2.5 reading per second 0.15%FS 6 Counts Sine wave input, full-wave averaging, rms calibrated - "-001" - 0.2 "000" 0.4 0.4 "001" 1 Cnts/C Counts Vdc Min. - - - - - Typ. - - - - - Max. 1.999 19.99 50.0 100.0 30.0 Units Amps Amps Amps Amps Amps Digital, LED-Display AC Ammeters with Built-in Current Transformers Physical/Environmental Case Material Dimensions Weight: ACA-20PC-1-XXX-XX ACA-20PC-2-XXX-XX ACA-20PC-3-XXX-XX ACA-20PC-4-XXX-XX DMS-30798-C 1.1 ounces (31 grams) 1.1 ounces (31 grams) 1.3 ounces (37 grams) 1.5 ounces (43 grams) 1.0 ounces (28 grams) Polycarbonate 1.38"W x 0.88"H. Depth is model dependent (see mechanical specification) 1.5 x rated full-scale current The ACA-20PC-1-AC1-RL and ACA-20PC-2-AC1-RL have 4-position on-board terminal blocks. All other models have 2-position terminal blocks. Specified full-scale currents are those passing through the built-in CT's primary(load) circuit, over the frequency of 45-450Hz. The Overcurrent Rating is a continuous rating that applies to the measured ac load current. It does not apply to any circuitry external to the meter. Accuracy is guaranteed to the rated current. For the ACA-20PC-2-AC1-RL, if the load is connected to the meter's on-board 4-position terminal block, the 20A full scale range requires 12AWG solid copper wire on all connections. If 14AWG solid copper wire is used, the current should be limited to 15A. See Figure 3. All specified maximum power supply currents are steady-state values. AC-powered models can draw higher surges at initial turn-on. Maximum reverse polarity protection on "DC1" models is -40Vdc. Ordering Information ACA - 20PC - 1 - AC1 - RL - L - C (45-450Hz) Input Range: 1 = 1.999A 2 = 19.99A 3 = 50.0A 4 = 100.0A RoHS Leaded CT (100A model) LED Color: RL = Red Standard BL = Blue Standard PGL = Green Standard Power Supply: AC1 = 85-264Vac@50/60Hz DC1 = +5-40Vdc ACA-20PC-X-XXX-XX (All other ac or dc-powered models with 2-position terminal blocks): Wire Size and Type Insulation Strip Length Screw Tightening Torque Display Display Type and Size Overrange Indication Decimal Point Physical/Environmental Operating Temperature Storage Temperature Humidity (non-condensing) 0 -40 0 - - - +60 +75 95 C C % 31/2 digit, 0.37"/9.4mm high LED "1_ _ _" Fixed, model dependent 16-24AWG (solid or stranded) 0.25 inches 3.6 pounds/inches (0.5Nm) DMS-30798-C: 30Amp model with a wire lead CT and "-AC1" power supply specifications. See Mechanical section for dimensions. Accessories: DMS-20-CP Panel cutout punch A DMS-BZL4-C bezel assembly with sealing gasket is supplied with each ammeter. For full de www.murata www.murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 MPM_ACA_20PC.B05 Page 2 of 6 ACA-20PC Series Digital, LED-Display AC Ammeters with Built-in Current Transformers TECHNICAL NOTES IMPORTANT! To ensure safe and reliable operation, ACA-20PC ammeters must be installed and serviced by qualified technical personnel. Contact DATEL if there is any doubt regarding ammeter installation and/or operation. 1. Measurement Type: ACA-20PC ac ammeters employ a full-waverectified, average responding, rms-calibrated circuit to measure the stepped-down output of their on-board, L1 current transformer (CT) . Stated accuracy specifications are measured using a sine-wave current at or close to the specified full scale input level, at nominal line frequency. 2. Calibration: Periodic recalibration of ACA-20PC ammeters is not required under normal, indoor operating environments. If user calibration is necessary, it should be performed by qualified technical personnel. Calibration is performed with potentially lethal voltages applied to the ACA-20PC and its associated wiring, with the specified full-scale current flowing through the ammeter's built-in current transformer. A plastic, fully insulated adjusting tool must be used to access the recessed calibration potentiometer located on the back of the meter (see Mechanical Specifications). Contact DATEL if additional information is required regarding calibration, setup, or any other technical issue pertaining to the ACA-20PC. 3. Wire Gauges and Fusing: Wires specified in the Functional Specifications section must be used for making connections to ACA-20PC Series ammeters. All power-supply and load wiring must be rated for the supply voltages and currents they will conduct and must comply with any code or application-mandated requirements pertaining to the user's specific installation. In particular, special attention must be paid to ACA-20PC-1-AC1-RL and ACA-20PC-2-AC1-RL ac-powered models when their built-in auxiliary terminal block connections (TB1) are used to supply current to an external load. The supply wires connected to both the meter and the load must be fused according to the current rating of the wire gauge being used, in accordance with applicable regulatory codes. Also, wire insulation should be stripped to within 10% of the stated dimensions, and wires should be inserted into TB1 such that their insulation is not pinched by the screw terminal. The ACA-20PC-3-ACX (0-50A range, ac-powered) and ACA-20PC4-ACX (0-100A, ac-powered) models' TB1 is used only for powering the meters' internal circuitry. It must not be used to supply current to external loads. The supply wires feeding these meters must also be fused according to the current rating of the wire gauge being used, in accordance with applicable regulatory codes. AC-powered models draw minimal steady-state supply currents (50mA max.), and in most applications, they can be fused according to the supply wire's maximum amperage rating. However, these models can draw significantly higher surge currents for brief periods when the ac line voltage is initially applied. 4. AC Supply Polarity and Grounding: The two ac supply inputs, TB1-A and TB1-B, on ac-powered ammeters are not in themselves polarity sensitive, that is, they have no internal "AC LO" or "AC HI" designations. Also, ac-powered ACA-20PC ammeters do not include or require a connection to earth/chassis ground. However, in many applications, external ac loads which are connected directly to the ACA-20PC's built-in auxiliary terminal blocks must be wired with proper polarity and connected to earth/chassis ground. 5. Connector Torque Ratings: It is important to tighten TB1's screw terminals to their rated torque specifications of 4.4 pound-inches (0.5Nm) for four-terminal ammeters (ACA-20PC-1-AC1-RL and ACA20PC-2-AC1-RL), and 3.6 pound-inches (0.4Nm) for two-terminal ammeters. Proper tightening will minimize connector losses and ensure safe, reliable operation. 6. 100 Amp Model (ACA-20PC-4-XXX): This model's built-in current transformer requires a larger panel cutout width dimension. See Mechanical Specifications for more information. 7. DC-Powered Models: DC-powered models draw minimal supply currents and in most applications can be fused according to the supply wire's maximum amperage rating. However, be sure to check and comply with all applicable codes and regulations to ensure proper installation and operation. 8. Isolation: The on-board CT (L1) provides a minimum 2000Vdc isolation between the current-carrying conductor passing through its primary circuit and the ammeter supply voltage connected to TB1. Of course, this isolation rating only applies to applications in which the load wiring (i.e., the wire passing through the CT's center hole) does not connect directly or indirectly to TB1-A or TB1-B. PANEL INSTALLATION All connections to ACA-20PC Series ammeters must be made after the ammeter is securely attached to the panel and with all load and supply voltages de-energized (off). Care should be exercised when passing the load-carrying conductor through the meter's built-in CT-- particularly when larger-gauge conductors are used. The position of the installed wire should be such that minimal forces are applied to the built-in CT, TB1, or to the ammeter itself. In high-vibration environments, adequate strain reliefs be used for all load and supply wiring. To ensure a secure panel-mount installation, DATEL recommends using the DMS-BZL4 bezel assembly (with sealing gasket) supplied with each ammeter. Also, please note that the ACA-20PC-4-XXX 100A oversize CT requires a larger panel-cutout width of 1.350" (34.3mm). See Mechanical Specifications for detailed cutout and ammeter dimensions. Following the four-step sequence shown in Figure 2 below--being careful not to apply excessive force or twisting motions--insert the ammeter into the panel opening. When using the DMS-BZL4 bezel assembly, install its sealing gasket so it is positioned between the ammeter's front flange and panel front surface (see Mechanical Specifications). Be sure to use and securely tighten all four screws supplied with the bezel assembly. Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com MPM_ACA_20PC.B05 Page 3 of 6 ACA-20PC Series Digital, LED-Display AC Ammeters with Built-in Current Transformers Step 1. Step 2. Step 3. Step 4. Panel Figure 2. Panel Installation TYPICAL WIRING DIAGRAM First pass and carefully dress one external load wire through the on-board CT (L1). Then connect the ac supply and load wires to TB1 as shown. If required, verify that correct line-power polarities are applied to the external load (see Technical Note 4). Ensure all wires are stripped and terminals torqued correctly. For proper operation, pass only one load wire through the on-board CT's center hole. ACA-20PC-X-ACX ACA-20PC-1-AC1-RL Figure 4. All Other AC-Powered Models ACA-20PC-2-AC1-RL ACA-20PC-X-DCX Figure 3. 2A and 20A, 85-264V AC-Powered Models With Auxilliary Load Connections Figure 5. All DC-Powered Models www.murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 MPM_ACA_20PC.B05 Page 4 of 6 ACA-20PC Series MECHANICAL SPECIFICATIONS ACA-20PC-1 & 2-AC1-RL 2A and 20A, 85-264V ac-powered models Digital, LED-Display AC Ammeters with Built-in Current Transformers ACA-20PC-1 & 2 2A and 20A, all other models Hole Diameter: 0.27 (6.9) min. Hole Diameter: 0.27 (6.9) min. 2.01 (51.1) 2.01 (51.1) 0.040 (1.02) (R) (R) 1.00 (25.4) 0.040 (1.02) (R) (R) 1.00 (25.4) 0.040 (1.02) 1.30 (33.0) 1.38 (35.1) 0.040 (1.02) 0.80 (20.3) 0.88 (22.4) 1.32 (33.5) 0.040 (1.02) 1.30 (33.0) 1.38 (35.1) 0.040 (1.02) 0.80 (20.3) 0.88 (22.4) 1.32 (33.5) FRONT VIEW BACK VIEW FRONT VIEW BACK VIEW CAL. CAL. ACA-20PC-3 Series 50A models ACA-20PC-4 Series 100A models 1.33 (33.8) Hole Diameter: 0.35 (8.9) min. Hole Diameter: 0.55 (14.0) min. * PANEL * THIS MODEL REQUIRES A (34.3MM) CUTOUT WIDTH OF 1.350" 2.12 (53.8) 2.53 (64.3) 0.040 (1.02) (R) (R) 1.00 (25.4) 0.040 (1.02) (R) (R) 1.00 (25.4) 0.040 (1.02) 1.30 (33.0) 1.38 (35.1) 0.040 (1.02) 0.80 (20.3) 0.88 (22.4) 1.54 (39.1) 0.040 (1.02) 1.30 (33.0) 1.38 (35.1) 0.040 (1.02) 0.80 (20.3) 0.88 (22.4) 1.32 (33.5) FRONT VIEW BACK VIEW FRONT VIEW BACK VIEW CAL. CAL. Mechanical Dimensions: Inches (mm) Tolerances: 2 PL DEC 0.02 (0.51), 3 PL DEC 0.010 (0.254) www.murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 MPM_ACA_20PC.B05 Page 5 of 6 ACA-20PC Series Digital, LED-Display AC Ammeters with Built-in Current Transformers MECHANICAL SPECIFICATIONS, CONTINUED ACA-20PC-4-XXX-L (100A model) DMS-30798-C (30A model) OD: 100A Model: 1.18 (30.0) DMS-30798-C (30A): 0.87 (22.0) BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT #2-56 INSERT 0.156 (3.96) DEEP 0.187 (4.75) FRONT VIEW 1.280 (32.51) ID: 100A Model: 0.58 (14.7) DMS-30798-C (30A): 0.35 (8.9) 1.826 (46.38) Lead Length: 2.0 (50.5) min. INTERNAL CORNER RADII: 0.032 (0.81) MAX. 0.116 (2.95) 1.07 (27.18) PANEL CUTOUT 0.838 (21.29) 0.040 (1.02) (R) (R) 1.00 (25.4) 0.093 (2.362) DIA (4 REQUIRED) 0.040 (1.02) 0.80 (20.3) 0.88 (22.4) 1.14 (29.0) 1.336 (33.93)* 1.626 (41.30) 0.145 (3.68) 0.040 (1.02) 1.30 (33.0) 1.38 (35.1) * 1.350 (34.3) for ACA-20PC-4-XXX 100A model. Gasket (R) (R) FRONT VIEW BACK VIEW CAL. USA: UK: France: Japan: Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com Website: www.murata-ps.jp Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 Canada: Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 www.murata-ps.com email: sales@murata-ps.com ISO 9001 REGISTERED 06/25/08 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) 2008 Murata Power Solutions, Inc. Germany: Munchen, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com China: www.murata-ps.com MPM_ACA_20PC.B05 Page 6 of 6 |
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