True-RMS-AC Ammeters with Built-in Built-in provide true-rms valu
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ACA-20RM Series
True-RMS-AC Ammeters with Built-in
Built-in provide true-rms values complex waveforms Perfect measuring current applications Five ranges measure: 0-0.2A, 0-2A, 0-20A, 0-30A 0-50A models features split-core easy installation Self-powered from 85-140Vac 170-264Vac Large, easy-to-read, display with 0.37" digits Reliable single-board construction Digital replacement analog meters recognized components
Murata Power Solution's ACA-20RM Series world's first digital ac-ammeters incorporate built-in current transformer (CT) directly measure true-rms value complex, non-sinusoidal currents from bulky expensive "donut" required! Operation setup straightforward: simply pass load-carrying wire through on-board apply power, ammeter fully operational. Five input ranges measure 0-0.2 amps (0.1mA resolution), amps (0.001A resolution), 0-20 amps (0.01A resolution), 0-30 amps (0.1A resolution) 0-50 amps (0.1A resolution). model features oversized split-core current transformer that easily accommodates wires sizes (21.2mm2). power supply options available: 85-140V (47-63Hz), 170-264V (47-63Hz). models totally self-contained; external components required. Power consumption from nominal 120V 220V supply less than 50mA. And, precision autozeroing circuitry, super-stable components, rms-to-dc converter circuit combine achieve excellent performance when measuring complex, non-sinusoidal, currents found today's computer/telecom equipment. ACA-20RM Series ammeters feature full-size, 0.37" (9.4mm) high, digit, bright LED-displays built-in bezel/filter assembly that features metal fasteners. They panel-cutout compatible with MPS's DMS-20 Series voltage frequency monitors, making ACA-20RM ammeters perfect replacements older, less reliable, analog panel meters today's sophisticated instrumentation.
CAL.
DIGIT CONVERTER
RMS-to-DC CONVERTER DISPLAY
(L1)
POWER CONVERTER
BUILT-IN CURRENT TRANSFORMER
full details www.murata-ps.com/rohs
MEASURED LOAD CURRENT
INPUT POWER
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MPM_ACA-20RM_B02 Page
ACA-20RM Series
True-RMS-AC Ammeters with Built-in
Performance/Functional Specifications
Typical +25°C, unless otherwise noted. Rated Full-Scale Current ACA-20RM-O-ACX-RL ACA-20RM-1-ACX-RL ACA-20RM-2-ACX-RL ACA-20RM-4-ACX-RL ACA-20RM-5-ACX-RL Overcurrent Rating Performance Sampling Rate Accuracy Measurement Type Temperature Drift Zero-Current Reading (within sec.) Dielectric Withstanding Voltage Power Supply Voltage ACA-20RM-X-AC3-RL ACA-20RM-X-AC4-RL Power Supply Current ACA-20RM-X-AC3-XX ACA-20RM-X-AC4-XX Power Supply Terminal Block Wire Size Insulation Strip Length Screw Tightening Torque Rated Voltage Display Display Type Size Overrange Indication Decimal Point Physical/Environmental Operating Temperature Storage Temperature Humidity Dimensions (non-condensing) Weight ACA-20RM-0,1,2-XXX-XX ACA-20RM-4-XXX-XX ACA-20RM-5-XXX-XX ounces grams) nominal ounces grams) nominal ounces grams) nominal Digit LED, 0.37"/9.4mm High "1_" Fixed, model dependent (see full-scale input Current) 16-22AWG, Solid stranded 0.250 inches pounds-inches (0.4Nm) 310Vac mA/47-63Hz mA/47-63Hz Vac/47-63Hz Vac/47-63Hz Samples second ±0.4%FS Counts with 60Hz Sine-Wave Input Responding, Crest Factors -001 2000 ±0.2 ±0.4 Cnts/°C Cnts Min. Typ. Max. 199.9 1.999 19.99 50.0 30.0 Units Specified full-scale currents those passing through ammeter's built-in current transformer's primary load-circuit. Notes below additional model-specific information. overcurrent rating rated full-scale current continuous rating applies current passing through built current transformer only, does apply external circuit-wiring external loads. Accuracy guaranteed rated current level. Specified accuracy applies inputs with crest factors (CF) 2.0, where Vpeak/Vrms. Crest factors introduce additional error full scale. Ammeters calibrated with near full-scale 60Hz sine-wave current flowing through ammeter's built-in specified maximum power supply currents steady state; larger surge currents occur initial application line power.
Rated Full-Scale Current
Ordering Information
ACA-20RM-
RoHS Color: Low-Power
Input Range: Power: 85-140Vac@50/60Hz 199.9mA 170-264Vac@50/60Hz 1.999A 19.99A 50.0A (with split-core flying-lead 30.0A (with flying-lead Accessories: DMS-20-CP Panel Cutout Punch
TECHNICAL NOTES
IMPORTANT! ensure safe reliable operation, ACA-20RM ammeters must installed serviced qualified technical personnel after reading this data sheet it's entirety. Contact DATEL there doubt regarding their installation operation. Measurement Type: ACA-20RM ammeters employ true-rms input circuitry measure stepped-down output their on-board current transformers (CT). Stated accuracy measured using sinewave input close specified full scale input, nominal line frequency 60HZ. Calibration: Periodic recalibration ACA-20RM ammeters required under normal indoor environments. user calibration deemed necessary, must performed qualified technical personnel since potentially lethal voltages currents applied ACA-20RM during calibration process. Calibration performed with approximately specified full-scale current flowing through ammeter's built-in fully insulated, non-metallic adjusting tool must used adjust calibration potentiometer, located back ammeter (see Mechanical Specifications section).
Model dependent, page
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MPM_ACA-20RM_B02 Page
ACA-20RM Series
True-RMS-AC Ammeters with Built-in
calibration potentiometer approximately turn rotation; force adjustment screw past stops. Contact additional information required regarding calibration, setup, other technical issue pertaining ACA-20RM ammeters. Wire Gauges Fusing: only wires specified under Functional Specifications Section when making connections ACA20RM Series ammeters. power supply load wiring must adequately rated supply voltages currents they will carry, they must comply with code- application-mandated requirements pertaining user's installation. supply wires connected ACA-20RM ammeters must fused accordance with applicable regulatory codes. Also, wire insulation should stripped within +/-10% stated dimensions; wires should inserted into such that screw terminal does pinch their insulation. only used supplying power meter's internal circuitry; must used supply current external loads. AC-powered models draw minimal steady-state supply currents (less than 0.050A) they fused according supply wire's maximum amperage rating. However, these models draw higher surge currents brief periods microsecond range) when power initially applied. Supply Polarity Grounding: supply inputs, `B', ACA-20RM ammeters polarity sensitive, that they have designations. Also, ac-powered ACA-20RM ammeters include require connection earth/ chassis ground. Connector Torque Ratings: sure tighten TB1's screw-terminals pound-inches (0.4Nm). Proper tightening will ensure reliable long-term operation. Isolation: on-board (L1) provides minimum 2000Vdc isolation between current-carrying load conductor passing through opening ammeter's power source that's connected TB1. course, this isolation rating applies only applications where load wire does connect directly indirectly TB1-A TB1-B (i.e., where different supplies involved). Split-Core (Clamp-on) Models: models feature split-core current transformer that clamped around current-carrying load conductor without having disconnect remove power from load's power source. This live-connection capability only used load's power source isolated (see technical note from ammeter's power source that's connected TB1. ammeter's power supply must always denergized before making connections TB1. Refer `Panel Installation' section this data sheet additional information.
WIRING DIAGRAMS
First pass carefully dress external load wire through then connect supply load wires shown. Ensure wires stripped properly tightened. accurate operation, make only
BACK VIEW
FUSED POWER LOAD FUSED POWER
pass with load wire through on-board (only primary turn). split-core models, make sure fully engage CT's Locking mechanism
BACK VIEW
LOAD FROM SUPPLY
Figure Connections pc-board mounted CT's
FROM SUPPLY
Figure Connection flying lead CT's
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MPM_ACA-20RM_B02 Page
ACA-20RM Series
True-RMS-AC Ammeters with Built-in
PANEL INSTALLATIONS
connections ACA-20RM Series ammeters must made after ammeter securely attached panel with associated load supply voltages de-energized (off). However, using extreme caution observing safety measures applicable user's installation, split-core models connected energized current-carrying load conductors, connections must always made with ammeter's power source off. Care should exercised when passing load-carrying conductor through meter's built-in CT-particularly when larger conductors used. installed wire-positions should such that minimal mechanical forces applied built-in TB1, ammeter itself. high-vibration environments, strongly recommended that adequate strain reliefs used load supply wiring. Using Figure guide, carefully insert bezel/color filter assembly into panel opening. From rear panel, install four round plastic standoffs over bezel's threaded studs. Install pc-board assembly then attach securely tighten four nuts. only factory-supplied hardware substitute hardware could result unsafe installation and/or adversely affect reliability ammeter itself. recommended range panel thickness that used with supplied hardware 0.040 inches (1.0mm) 0.125 inches (3.2mm). Panel thickness outside this range will require additional user-supplied hardware and/or modifications.
PANEL
Figure Panel Installation
BEZEL PANEL CUTOUT
0.187 (4.75) FRONT VIEW 0.55 (13.97)
RECOMMENDED DRILL PANEL CUTOUT DIMENSIONS
INTERNAL CORNER RADII: 0.032 (0.81) MAX. 0.116 (2.95)
1.280 (32.51)
1.07 (27.18)
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 REQUIRED)
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ACA-20RM Series
True-RMS-AC Ammeters with Built-in
MECHANICAL SPECIFICATIONS
2.100 (53.34)
2.100 (53.34)
2.100 (53.34)
1.400 (35.56)
1.400 (35.56)
1.750 (44.45)
Lead Length (127.0) min.
Lead Length (50.5) min. 0.35 (8.9) Diameter
1.575 (40.00)
0.40 (10.2) Diameter 0.26 (6.6) Diameter 0.984 (24.99)
0.250 (6.35) 1.024 (26.01) 0.250 (6.35)
0.480 (12.19)
1.00 (2.54) Models
0.250 (6.35)
0.551 (14.00) 0.480 (12.19)
MECHANICAL DIMENSIONS: Inches (mm) TOLERANCES: ±0.02 (±0.51) ±0.010 (±0.254)
USA: Canada: France: Germany: Japan: China: Singapore:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com Milton Keynes, Tel: (0)1908 615232, email: mk@murata-ps.com Montigny Bretonneux, Tel: (0)1 email: france@murata-ps.com Tel: (0)89-544334-0, email: munich@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 Shanghai, Tel: 3678, email: shanghai@murata-ps.com Guangzhou, Tel: 8066, email: guangzhou@murata-ps.com Parkway Centre, Tel: 6348 9096, email: singapore@murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: 3000
Murata Power Solutions, Inc. Cabot Boulevard, Mansfield, 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 9001 14001 REGISTERED
12/23/08
Murata Power Solutions, Inc. makes representation that products circuits described herein, other technical information contained herein, will infringe upon existing future patent rights. descriptions contained herein imply granting licenses make, use, sell equipment constructed accordance therewith. Specifications subject change without notice. 2008 Murata Power Solutions, Inc.
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MPM_ACA-20RM_B02 Page
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