www.murata-ps.com ACA-20RM Series True-RMS-AC Ammeters with Built-in CT C US E156931 FEATURES Murata Power Solutions new ACA-20RM Series are the worlds rst digital ac-ammeters to incorporate a built-in current transformer (CT) to directly measure the true-rms value of Built-in CTs provide true-rms values of complex complex, non-sinusoidal ac currents from 2 to 50A no bulky and expensive 5A donut waveforms CTs are required Operation and setup is straightforward: simply pass the load-carrying Perfect for measuring AC current in IT applications wire through the on-board CT, apply power, and the ammeter is fully operational. Five ranges measure: 0-0.2A, 0-2A, 0-20A, 0-30A Five input ranges measure 0-0.2 amps (0.1mA resolution), 0-2 amps (0.001A resolution), and 0-50A 0-20 amps (0.01A resolution), 0-30 amps (0.1A resolution) or 0-50 amps (0.1A resolution). The 50A model features an oversized split-core current transformer that easily accommo- 50A models features a split-core CT for easy installation 2 dates wires sizes up to 4 AWG (21.2mm ). Two power supply options are available: 85-140V Self-powered from 85-140Vac or 170-264Vac (47-63Hz), and 170-264V (47-63Hz). Large, easy-to-read, red LED display with 0.37 digits All models are totally self-contained no external components are required. Power con- sumption from a nominal 120V or 220V ac supply is less than 50mA. And, precision auto- Reliable single-board construction zeroing circuitry, super-stable components, and an rms-to-dc converter circuit combine to Digital replacement for analog meters achieve excellent performance when measuring the complex, non-sinusoidal, ac currents Approvals to UL/cUL/IEC/61010-1 found in todays computer/telecom equipment. ACA-20RM Series ammeters feature full-size, 0.37 (9.4mm) high, 3 digit, bright red LED-displays and a built-in bezel/ lter assembly that features metal fasteners. They are panel-cutout compatible with MPSs DMS-20 Series of ac voltage and frequency monitors, making ACA-20RM ammeters perfect replacements for older, less reliable, analog panel meters in todays sophisticated IT instrumentation. CAL. + 3 DIGIT A/D CONVERTER +V V LED DISPLAY RMS-to-DC CONVERTER POWER CONVERTER (L1) BUILT-IN AB CURRENT TRANSFORMER TB1 For full details go to www.murata-ps.com/rohs MEASURED AC CURRENT LIMITED LOAD CURRENT AC SUPPLY www.murata-ps.com/support MPM ACA-20RM.C01 Page 1 of 5ACA-20RM Series True-RMS-AC Ammeters with Built-in CT Performance/Functional Speci cations Speci ed full-scale currents are those passing through the ammeters built-in current transformers primary load-circuit. See Notes 2 and 3 below for ad- Typical at TA = +25C, unless otherwise noted. ditional model-speci c information. Min. Typ. Max. Units Rated Full-Scale Current The overcurrent rating of 1.5 x the rated full-scale current is a continuous rating ACA-20RM-O-ACX-RL 199.9 mA and applies to the current passing through the built in current transformer only, it does not apply to any external circuit-wiring or external loads. Accuracy is ACA-20RM-1-ACX-RL 1.999 A guaranteed up to the rated current level. ACA-20RM-2-ACX-RL 19.99 A Speci ed accuracy applies to inputs with crest factors (CF) up to 2.0, where CF ACA-20RM-4-ACX-RL 50.0 A = Vpeak/Vrms. Crest factors of 2 to 5 introduce an additional error of 3% of full scale. Ammeters are calibrated with a near full-scale 60Hz sine-wave current ACA-20RM-5-ACX-RL 30.0 A owing through the ammeters built-in CT. Overcurrent Rating 1.5 x Rated Full-Scale Current All speci ed maximum power supply currents are steady state larger surge Performance currents can occur at initial application of line power. Sampling Rate 2.5 Samples per second Accuracy 0.4%FS 3 Counts with 60Hz Ordering Information Sine-Wave Input ACA-20RM- 1 - AC3 - R L - C Measurement Type RMS Responding, Crest Factors of 1-5 Temperature Drift (0 to 60 C) 0.2 0.4 Cnts/C Add -C for RoHS Zero-Current Reading (within 001 000 001 Cnts LED Color: 30 sec.) RL = Low-Power Red Input Range: Power: Dielectric Withstanding Voltage 2000 Vdc 0 = 199.9mA AC3 = 85-140Vac 50/60Hz UL/IEC61010-1 Measurement category II AC4 = 170-264Vac 50/60Hz 1 = 1.999A 2 = 19.99A Power Supply Voltage 4 = 50.0A (with split-core ying-lead CT) ACA-20RM-X-AC3-RL 85 120 140 Vac/47-63Hz 5 = 30.0A (with ying-lead CT) ACA-20RM-X-AC4-RL 170 220 264 Vac/47-63Hz Accessories: Power Supply Current DMS-20-CP Panel Cutout Punch ACA-20RM-X-AC3-XX 30 50 mA/47-63Hz See www.murata-ps.com/dpm-availability for model-speci c availability. ACA-20RM-X-AC4-XX 30 50 mA/47-63Hz Power Supply Terminal Block Wire Size 16-22AWG, Solid and stranded TECHNICAL NOTES Insulation Strip Length 0.250 inches IMPORTANT To ensure safe and reliable operation, ACA-20RM Screw Tightening Torque 2.2 lbin (0.25 Nm) 20% ammeters must be installed and serviced by quali ed technical Rated Voltage 310Vac personnel after reading this data sheet in it s entirety. Contact Murata Display Power Solutions if there is any doubt regarding their installation or Display Type and Size 3 Digit Red LED, 0.37 /9.4mm High operation. Overrange Indication 1 1. Measurement Type: ACA-20RM ac ammeters employ true-rms Decimal Point Fixed, model dependent input circuitry to measure the stepped-down output of their on-board (see full-scale input Current) current transformers (CT). Stated accuracy is measured using a sine- Physical/Environmental wave input at, or close to, the speci ed full scale input, at a nominal Operating Temperature 0 +60 C line frequency of 60HZ. Storage Temperature 40 +75 C 2. Calibration: Periodic recalibration of ACA-20RM ammeters is not Humidity 40 +95 % required under normal indoor environments. If user calibration is deemed necessary, it must be performed by quali ed technical Dimensions (non-condensing) Model dependent, see page 3 & 4 personnel since potentially lethal voltages and currents are applied to Weight the ACA-20RM during the calibration process. ACA-20RM-0,1,2-XXX-XX 1.1 ounces (31 grams) nominal Calibration is performed with approximately 95% of the speci ed ACA-20RM-4-XXX-XX 2.1 ounces (60 grams) nominal full-scale current owing through the ammeters built-in CT. A fully ACA-20RM-5-XXX-XX 1.5 ounces (43 grams) nominal insulated, non-metallic adjusting tool must be used to adjust the calibration potentiometer, located on the back of the ammeter (see Mechanical Speci cations section). www.murata-ps.com/support MPM ACA-20RM.C01 Page 2 of 5