ACA-20PC Series www.murata-ps.com Digital, LED-Display AC Ammeters with Built-in Current Transformers Now le with il a v A ab CTs ad e L Wire C US E156931 (R) 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 Murata Power Solutions' 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. 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; approvals to UL/cUL/IEC/61010-1 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 -V LED DISPLAY RMS-to-DC CONVERTER (L1) BUILT-IN CURRENT TRANSFORMER POWER CONVERTER A B Figure 1. ACA-20PC Series simplified schematic TB1 For full details go to www.murata-ps.com/rohs MEASURED AC LOAD CURRENT CURRENT LIMITED AC OR DC SUPPLY www.murata-ps.com/support MPM_ACA_20PC.C01 Page 1 of 6 ACA-20PC Series Digital, LED-Display AC Ammeters with Built-in Current Transformers Performance/Functional Specifications Typical at TA = +25C, unless otherwise noted. Full-Scale Current (45-450Hz) Min. Typ. Max. Units Physical/Environmental ACA-20PC-1-XXX-XX - - 1.999 Amps Case Material Dimensions ACA-20PC-2-XXX-XX - - 19.99 Amps ACA-20PC-3-XXX-XX - - 50.0 Amps ACA-20PC-4-XXX-XX - - 100.0 Amps DMS-30798-C - - 30.0 Amps Overcurrent Rating 1.5 x rated full-scale current Performance Sampling Rate 2.5 reading per second Accuracy 0.15%FS 6 Counts Measurement Type Temperature Drift (0 = +60C) Zero Reading (Vin = 0 Volts) Dielectric Withstanding Voltage Sine wave input, full-wave averaging, rms calibrated Weight: ACA-20PC-1-XXX-XX 1.1 ounces (31 grams) ACA-20PC-2-XXX-XX 1.1 ounces (31 grams) ACA-20PC-3-XXX-XX 1.3 ounces (37 grams) ACA-20PC-4-XXX-XX 1.5 ounces (43 grams) DMS-30798-C 1.0 ounces (28 grams) 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. - 0.2 0.4 Cnts/C "000" "001" Counts 2000 - - Vdc 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. Vac 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. Measurement category II Power Supply Voltage ACA-20PC-X-DC1-RL 1.38"W x 0.88"H. Depth is model dependent (see mechanical specification) "-001" UL/IEC61010-1 ACA-20PC-X-AC1-RL (47-99Hz) Polycarbonate 85 120 264 +4.75 - +40 Vdc Power Supply Current ACA-20PC-X-AC1-RL (47-99Hz) - 30 50 mA ACA-20PC-X-DC1-RL - +8 +12 mAdc 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. Power Supply Terminal Block Ordering Information 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 12-20AWG (solid), 14-20AWG (stranded) Insulation Strip Length 0.25 inches Screw Tightening Torque 4.4 lb*in (0.5N*m) 20% Maximum Rated Current 20A with 12AWG solid wire; 15A with 14AWG solid or stranded wire Maximum Rated Voltage 630V (VDE 0110-V. Group 2) 250V (VDE 0110-V Group 3) ACA-20PC-X-XXX-XX (All other ac or dc-powered models with 2-position terminal blocks): Wire Size and Type 16-24AWG (solid or stranded) Insulation Strip Length (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 See www.murata-ps.com/dpm-availability for model-specific availability. 0.25 inches Screw Tightening Torque DMS-30798-C: 30Amp model with a wire lead CT and "-AC1" power supply specifications. See Mechanical section for dimensions. 2.2 lb*in (0.25 N*m) 20% Display Display Type and Size ACA - 20PC - 1 - AC1 - RL - L - C 31/2 digit, 0.37"/9.4mm high LED Overrange Indication "1_ _ _" Decimal Point Accessories: DMS-20-CP Panel cutout punch A DMS-BZL4-C bezel assembly with sealing gasket is supplied with each ammeter. Fixed, model dependent Physical/Environmental Operating Temperature Storage Temperature Humidity (non-condensing) 0 - +60 C -40 - +75 C 0 - 95 % www.murata-ps.com/support MPM_ACA_20PC.C01 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 Murata Power Solutions if there is any doubt regarding ammeter installation and/or operation. 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. 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. 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. 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. 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. 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 Murata Power Solutions 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. ACA-20PC Series ammeters are not internally fused. Special attention must be paid to ACA-20PC-1-AC1 (0-2A range) and ACA-20PC-2-AC1 (0-20A range) ac-powered models when their built-in auxiliary terminal block connections on TB1 are used to supply power to an external load. The input supply wires connected to both the ammeter and the load must be fused according to the current rating of the wire gauge being used, in accordance with applicable regulatory codes, but not to exceed TB1's maximum 20A rating. If TB1 is not used to supply power to external loads, a 0.25A/250V time delay/time lag fuse must be used. ACA-20PC-3-AC1 (0-50A range, ac-powered) and ACA-20PC- 4-AC1 (0-100A, ac-powered) models' TB1 is to be used only for powering the ammeters' internal circuitry; it must not be used to supply power to external loads. The supply wires feeding these models must be fused with a 0.25A time delay/time lag fuse, in accordance with applicable regulatory codes. Wire insulation must 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. 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" 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, Murata Power Solutions recommends using the DMS-BZL4 bezel assembly (with sealing gasket) supplied with each ammeter. Also, please note that the ACA20PC-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. www.murata-ps.com/support MPM_ACA_20PC.C01 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. FUSED 85-264Vac POWER FUSED 85-264Vac POWER FUSED AC POWER SUPPLY ACA-20PC-X-ACX TO AC LOAD ACA-20PC-1-AC1-RL AC SUPPLY Figure 4. All Other AC-Powered Models + FUSED DC POWER SUPPLY - ACA-20PC-2-AC1-RL 85-264Vac TO LOAD TO LOAD ACA-20PC-X-DCX Figure 3. 2A and 20A, 85-264V AC-Powered Models With Auxilliary Load Connections + - TO AC LOAD AC SUPPLY Figure 5. All DC-Powered Models www.murata-ps.com/support MPM_ACA_20PC.C01 Page 4 of 6 ACA-20PC Series Digital, LED-Display AC Ammeters with Built-in Current Transformers MECHANICAL SPECIFICATIONS ACA-20PC-1 & 2-AC1-RL ACA-20PC-1 & 2 2A and 20A, 85-264V ac-powered models 2A and 20A, all other models Hole Diameter: 0.27 (6.9) min. Hole Diameter: 0.27 (6.9) min. 2.01 (51.1) 0.040 (1.02) 0.040 (1.02) 2.01 (51.1) 1.00 (25.4) 1.30 (33.0) 1.38 (35.1) 0.040 (1.02) 0.040 (1.02) 0.80 (20.3) 0.88 (22.4) 0.040 (1.02) 1.00 (25.4) 1.30 (33.0) 1.38 (35.1) 0.040 (1.02) 1.32 (33.5) FRONT VIEW 0.80 (20.3) 0.88 (22.4) 1.32 (33.5) BACK VIEW FRONT VIEW BACK VIEW CAL. CAL. ACA-20PC-3 Series ACA-20PC-4 Series 50A models 100A models with pc-board mounted CTs 1.33 (33.8) * MODEL REQUIRES A PANEL * THIS CUTOUT WIDTH OF 1.350" (34.3MM) Hole Diameter: 0.35 (8.9) min. Hole Diameter: 0.55 (14.0) min. 2.53 (64.3) 2.12 (53.8) 0.040 (1.02) 0.040 (1.02) 1.30 (33.0) 1.38 (35.1) 1.00 (25.4) 0.040 (1.02) 0.040 (1.02) 0.80 (20.3) 0.88 (22.4) 0.040 (1.02) 1.54 (39.1) FRONT VIEW BACK VIEW CAL. 1.30 (33.0) 1.38 (35.1) 1.00 (25.4) 0.040 (1.02) 0.80 (20.3) 0.88 (22.4) 1.32 (33.5) FRONT VIEW BACK VIEW CAL. Mechanical Dimensions: Inches (mm) Tolerances: 2 PL DEC 0.02 (0.51), 3 PL DEC 0.010 (0.254) www.murata-ps.com/support MPM_ACA_20PC.C01 Page 5 of 6 ACA-20PC Series Digital, LED-Display AC Ammeters with Built-in Current Transformers BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT MECHANICAL SPECIFICATIONS, CONTINUED 0.187 (4.75) #2-56 INSERT 0.156 (3.96) DEEP 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) 1.280 (32.51) FRONT VIEW ID: 100A Model: 0.58 (14.7) DMS-30798-C (30A): 0.35 (8.9) 1.826 (46.38) 0.116 (2.95) Lead Length: 2.0 (50.5) min. INTERNAL CORNER RADII: 0.032 (0.81) MAX. 1.07 (27.18) 0.040 (1.02) 1.00 (25.4) 0.093 (2.362) DIA (4 REQUIRED) 0.040 (1.02) 1.30 (33.0) 1.38 (35.1) 0.838 (21.29) PANEL CUTOUT 0.040 (1.02) 0.80 (20.3) 0.88 (22.4) 0.145 (3.68) 1.336 (33.93)* 1.626 (41.30) * 1.350 (34.3) for ACA-20PC-4-XXX 100A model with pc-board mounted CTs. FRONT VIEW BACK VIEW Gasket 1.14 (29.0) (R) BEZEL CAL. 1. Description of safety marks: Caution, risk of electrical shock Caution, risk of danger Equipment is protected throughout by double or reinforced insulation 2. Cleaning Instructions: Gently clean with dry cloth only. 3. Caution: if the equipment is used in a manner not specified by Murata Power Solutions, the protection provided by the equipment may be impaired. 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/ 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) 2015 Murata Power Solutions, Inc. www.murata-ps.com/support MPM_ACA_20PC.C01 Page 6 of 6