ACA-20PC Series www.murata-ps.com Digital, LED-Display AC Ammeters with Built-in Current Transformers C US E156931 Murata Power Solutions new ACA-20PC Series are the rst digital ac ammeters to incorporate on-board current transformers (CTs), and they are amazingly easy to use. Simply pass the FEATURES current-carrying load wire through the ACA-20PCs on-board CT, apply power to the meter s Built-in Current Transformers for direct measurement two supply terminals, and youre instantly measuring ac currents over one of four ranges (0-2A of 0 to 2/20/50/100 Amps with 1mA resolution, 0-20A with 10mA resolution, or 0-50A and 0-100A with 100mA resolu- Functionally complete: tion). Absolutely no external components, such as expensive low-value shunts or 5Adonu On-board current transformers CTs, are required. Scaling/interface circuitry Meters are ac powered (120/220Vac 50/60Hz) or dc powered (+5-40V) and impose Precision A/D converters minimal loads (50mA max. and 120mA max., respectively) on their supplies. All models employ Bright red LED displays auto-zeroing circuits, precision bandgap references, and super stable thin- lm resistors for 8 different models unsurpassed accuracy (0.15%FS) and stability. Subminiature, 1.38 x 0.88 package The functionally complete ACA-20PC ammeters provide all the scaling/interface circuitry to Easy-to-read, 0.37 /9.4mm digits mate the CTs output to a precision (3 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-pow- AC powered models 85-264Vac 50/60Hz ered units have on-board AC/DC converters, and wide-range dc-powered units have on-board Self-powere 85-264Vac, 2A and 20A models feature linear regulators. AC-powered models can be powered by the same ac supply whose current built-in load connections they are monitoring. The 2A and 20A, 85-264Vac, 50/60Hz AC1 ) models feature additional +5-40V dc powered models on-board terminal blocks to supply power to the external load. All models provide 2000Vdc iso- 2000V isolation approvals to UL/cUL/IEC/61010-1 lation 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. + 3 DIGIT A/D CONVERTER +V V LED DISPLAY RMS-to-DC CONVERTER POWER CONVERTER (L1) BUILT-IN A B CURRENT Figure 1. ACA-20PC Series simpli ed schematic TRANSFORMER TB1 MEASURED AC CURRENT LIMITED For full details go to LOAD CURRENT AC OR DC SUPPLY www.murata-ps.com/rohs www.murata-ps.com/support MPM ACA 20PC.C01 Page 1 of 6 Now Available with Wire Lead CTsACA-20PC Series Digital, LED-Display AC Ammeters with Built-in Current Transformers Performance/Functional Speci cations Typical at TA = +25C, unless otherwise noted. Min. Typ. Max. Units Physical/Environmental Full-Scale Current (45-450Hz) Case Material Polycarbonate ACA-20PC-1-XXX-XX 1.999 Amps Dimensions 1.38W x 0.88H. Depth is model depen- 19.99 Amps ACA-20PC-2-XXX-XX dent (see mechanical speci cation) ACA-20PC-3-XXX-XX 50.0 Amps Weight: ACA-20PC-4-XXX-XX 100.0 Amps ACA-20PC-1-XXX-XX 1.1 ounces (31 grams) DMS-30798-C 30.0 Amps ACA-20PC-2-XXX-XX 1.1 ounces (31 grams) 1.5 x rated full-scale current Overcurrent Rating ACA-20PC-3-XXX-XX 1.3 ounces (37 grams) Performance ACA-20PC-4-XXX-XX 1.5 ounces (43 grams) Sampling Rate 2.5 reading per second DMS-30798-C 1.0 ounces (28 grams) 0.15%FS 6 Counts Accuracy Measurement Type Sine wave input, full-wave averaging, The ACA-20PC-1-AC1-RL and ACA-20PC-2-AC1-RL have 4-position on-board rms calibrated terminal blocks. All other models have 2-position terminal blocks. Temperature Drift (0 = +60C) 0.2 0.4 Cnts/C Speci ed full-scale currents are those passing through the built-in CT s Zero Reading (Vin = 0 Volts) 001 000 001 Counts 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 Dielectric Withstanding Voltage 2000 Vdc not apply to any circuitry external to the meter. Accuracy is guaranteed to the UL/IEC61010-1 Measurement category II rated current. Power Supply Voltage 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 ACA-20PC-X-AC1-RL (47-99Hz) 85 120 264 Vac copper wire on all connections. If 14AWG solid copper wire is used, the current ACA-20PC-X-DC1-RL +4.75 +40 Vdc should be limited to 15A. See Figure 3. Power Supply Current All speci ed maximum power supply currents are steady-state values. AC-powered models can draw higher surges at initial turn-on. ACA-20PC-X-AC1-RL (47-99Hz) 30 50 mA Maximum reverse polarity protection onDC1 models is 40Vdc. ACA-20PC-X-DC1-RL +8 +12 mAdc 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): ACA - 20PC - 1 - AC1 - RL - L - C Wire Size and Type 12-20AWG (solid), 14-20AWG (stranded) (45-450Hz) RoHS Insulation Strip Length 0.25 inches Input Range: Leaded CT (100A model) Screw Tightening Torque 4.4 lbin (0.5Nm) 20% 1 = 1.999A LED Color: 2 = 19.99A Maximum Rated Current 20A with 12AWG solid wire 15A with RL = Red Standard 3 = 50.0A 14AWG solid or stranded wire BL = Blue Standard 4 = 100.0A Power Supply: PGL = Green Standard Maximum Rated Voltage 630V (VDE 0110-V. Group 2) 250V (VDE 0110-V Group 3) 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): See www.murata-ps.com/dpm-availability for model-speci c availability. Wire Size and Type 16-24AWG (solid or stranded) Insulation Strip Length 0.25 inches DMS-30798-C: 30Amp model with a wire lead CT and -AC1 Screw Tightening Torque 2.2 lbin (0.25 Nm) 20% power supply speci cations. See Mechanical section for dimensions. Display Display Type and Size 3 digit, 0.37 /9.4mm high LED Accessories: DMS-20-CP Panel cutout punch Overrange Indication 1 A DMS-BZL4-C bezel assembly with sealing gasket is supplied with each ammeter. Decimal Point Fixed, model dependent Physical/Environmental Operating Temperature 0 +60 C Storage Temperature 40 +75 C Humidity (non-condensing) 0 95 % www.murata-ps.com/support MPM ACA 20PC.C01 Page 2 of 6