True-rms-AC Ammeters with Inputs Scales displays true-rms output
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ACA5-20RM Series
True-rms-AC Ammeters with Inputs
Scales displays true-rms output current transformers Accurately measure complex current waveforms Perfect measuring current applications Available three input ranges: 0-100A, 200A, 500A Functionally complete: On-board, low-burden toroid sensor Scaling/interface circuitry Precision converter Reliable single-board construction Easy-to-read, display with 0.37"/9.4mm digits power options: 85-140Vac 170-264Vac (50/60Hz) 2000V isolation between supply external Digital replacement analog meters
Murata Power Solutions' ACA5-20RM Series accept output external current transformers (CTs) accurately display true-rms value complex, non-sinusoidal currents 500A. Operation setup straightforward: simply pass external CT's secondary 0-5A output leads through ACA5-20RM's on-board toroid sensor, apply power, ammeter fully operational. models totally self-contained-other than external other user-supplied components required. Three input ranges measure 0-100.0 amps (with 0.1A resolution), 0-200 amps (0.1A resolution), 0-500 amps resolution). power supply options available: 85-140V (47-63Hz), 170-264V (47-63Hz). Power consumption from nominal 120V 220V supply less than 50mA. And, precision auto-zeroing 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. ACA5-20RM Series ammeters feature full-size, 0.37" (9.4mm) high, digit, bright LED-displays built-in bezel/filter assembly that features metal fasteners. They also panel-cutout compatible with Murata Power Solutions' DMS-20RM Series rms-reading voltage monitors, making ACA5-20RM ammeters perfect replacements older, less reliable, analog voltmeters ammeters today's sophisticated instrumentation.
PRECISION rms-to-DC CONVERTER
BUILT-IN TOROID SENSOR
full details www.murata-ps.com/rohs
Figure ACA5-20RM Series simplified schematic
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MPM_ACA5-20RM.A01 Page
ACA5-20RM Series
True-rms-AC Ammeters with Inputs
Performance/Functional Specifications
Typical +25°C, unless otherwise noted. Full-Scale Primary Current Models Overcurrent Rating Min. Typ. Max. Units Amps specified full-scale current current circulating through meter's built-in current transformer's primary circuit (i.e., external current transformer's 0-5A output current). overcurrent rating times rated full-scale current continuous rating applies current passing through built current transformer (CT). Accuracy only guaranteed rated full-scale current 5Arms. Specified accuracy applies inputs with crest factors (CF) 2.0, where Vpeak/Vrms. Crest factors introduce additional error full scale. Ammeters calibrated with 5.00Arms/60Hz current flowing through ammeter's built-in specified maximum power supply currents steady state; larger surge currents occur initial turn-on.
Rated full-scale current
Display Readings with Flowing through Ammeter's Current Transformer Model Number ACA5-20RM-3-ACX-RL ACA5-20RM-5-ACX-RL ACA5-20RM-9-ACX-RL Performance Sampling Rate Accuracy Input Frequency Range Measurement Type Temperature Drift Zero-Current Reading (within sec.) Breakdown Voltage Power Supply Voltage ACA5-20RM-X-AC3-RL ACA5-20RM-X-AC4-RL Power Supply Current ACA5-20RM-X-AC3-RL ACA5-20RM-X-AC4-RL mA/47-63Hz mA/47-63Hz Vac/47-63Hz Vac/47-63Hz Samples second ±0.4%FS Counts with 60Hz Sine-Wave Input 47-63 Display Reading 100.0 199.9
Ordering Information
ACA5-20RM-3-AC3-RL-C ACA5-20RM-3-AC4-RL-C ACA5-20RM-5-AC3-RL-C ACA5-20RM-5-AC4-RL-C ACA5-20RM-9-AC3-RL-C ACA5-20RM-9-AC4-RL-C 100.0A Range, 85-140Vac power 100.0A Range, 170-264Vac power 199.9A Range, 85-140Vac power 199.9A Range170-264Vac power 500A Range, 85-140Vac power 500A Range, 170-264Vac power
Responding, Crest Factors -001 2000 ±0.2 ±0.4 Cnts/°C Cnts
Accessory Current Transformers above*: 7020-01038-0 7020-01040-0 39-3681409 100A Current Transformer, RoHS compliant 200A Current Transformer, RoHS compliant 500A Current Transformer, RoHS compliant
data sheet titled "Current Transformers" www.murata-ps.com more information
Power Supply Terminal Block (all models) Wire Size Insulation Strip Length Screw Tightening Torque Rated Voltage Display Display Type Size Overrange Indication Display Reading/Decimal Point Physical/Environmental Operating Temperature Storage Temperature Humidity (non-condensing) Dimensions Weight models Ounces grams) nominal Digit LED, 0.37"/9.4mm High "1_" Model dependent; "Display Readings" above 16-22AWG, Solid stranded 0.250 inches pounds-inches (0.4Nm) 310Vac
TECHNICAL NOTES
IMPORTANT! ensure safe reliable operation, ACA5-20RM ammeters must installed serviced qualified technical personnel. Contact Murata Power Solutions there doubt regarding ammeter installation and/or operation. Measurement Type: ACA5-20RM ammeters employ true input circuit measure output external current transformers. Stated accuracy specifications measured using sine-wave current close full-scale input range, nominal line frequency 60Hz. Calibration: Periodic recalibration ACA5-20RM ammeters required under normal, indoor operating environments. user calibration necessary, should performed qualified technical personnel. Calibration performed with potentially lethal voltages applied ACA5-20RM associated wiring, with amps flowing through ammeter's built-in toroid sensor. plastic, fully-insulated adjusting tool must used access calibration potentiometer located back meter (see Mechanical Specifications). Contact additional information required regarding calibration, setup, other technical issue pertaining ACA5-20RM ammeters.
Model dependent, page
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MPM_ACA5-20RM.A01 Page
ACA5-20RM Series
True-rms-AC Ammeters with Inputs
Wire Gauges Fusing: Wires specified Functional Specifications section must used making connections ACA5-20RM Series ammeters. power-supply load wiring must rated supply voltages currents they will conduct must comply with code application-mandated requirements pertaining user's specific installation. supply wires connected both ammeter load must fused according current rating wire gauge being used, accordance with applicable regulatory codes. Also, wire insulation should stripped within +/-10% stated dimensions, wires should inserted into such that their insulation pinched screw terminal. used only powering meter's internal circuitry; must used supply current external loads. models draw minimal steady-state supply currents (50mA max.), most applications they fused according supply wire's maximum amperage rating. However, these models draw significantly higher surge currents brief periods when line voltage initially applied. Supply Polarity Grounding: supply inputs, TB1-A TB1-B, ACA5-20RM ammeters themselves polarity sensitive, that they have internal designations. ACA5-20RM ammeters include require connection earth/ chassis ground. Connector Torque Ratings: important tighten TB1's, screw-terminals their rated torque specification pound-inches (0.4Nm). Proper tightening will minimize connector losses ensure safe, reliable operation. Isolation: built-in toroid sensor (L1) provides minimum 2000Vdc isolation between external CT's secondary conductors ammeter supply voltage connected TB1. Precautions: normal operation, CT's secondary circuit operates very voltage closed-loop operation burden resistance. However, still generate potentially lethal voltages output current suddenly interrupted. example, loose secondary connections cause condition referred "inductive kick". Inductive kick generate extremely high voltages across CT's intermittent secondary connections. Therefore, implementing connections current transformer's output leads must only performed with zero load-current flowing CT's primary load-circuit. Connections Grounding: Some applications require connecting external CT's output leads earth/chassis ground. USA, consult latest revision National Electrical Code (NEC) more information regarding grounding. After mechanical assembly completed, connect output leads external each other after they through L1's center hole. Pressure-style connectors (commonly referred "wire nuts") acceptable long they rated number conductors voltage involved. Replacing Analog Panel Meters: ACA5-20RM ammeters used direct replacements most analog panel meters driven external CT's. wiring operations must performed with both load supply power sources completely de-energized.
BACK VIEW
FUSED POWER
Figure Typical wiring diagram
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MPM_ACA5-20RM.A01 Page
ACA5-20RM Series
True-rms-AC Ammeters with Inputs
PANEL INSTALLATION
connections ACA-20RM Series ammeters must made after ammeter securely attached panel with associated load supply voltages de-energized (off), using extreme caution observing safety measures applicable user's installation. Care should exercised when passing conductors through ammeter's built-in toroid sensor installed wire-positions should such that minimal mechanical forces applied TB1, ammeter itself. high-vibration environments, strongly recommended that adequate strain reliefs used 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 ACA5-20RM pc-board assembly shown then attach securely tighten four nuts. only factory-supplied hardware substitute hardware could result unsafe installation and/or adversely affect reliability ammeter. 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 modifications.
PANEL 0.032 (0.8) Thick Gasket
Board-Cutout
Gasket Bezel
Standoff
Standoff 0.190 (4.83)
ACA5-20RM Ammeter
SIDE VIEW
BEZEL PANEL CUTOUT
0.187 (4.75) FRONT VIEW
Figure Panel Installation
RECOMMENDED DRILL PANEL CUTOUT DIMENSIONS
0.55 (13.97) 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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Technical enquiries email: sales@murata-ps.com, tel: 3000
MPM_ACA5-20RM.A01 Page
ACA5-20RM Series
True-rms-AC Ammeters with Inputs
MECHANICAL SPECIFICATIONS
FRONT VIEW
2.100 (53.34)
100-10 100-10
1.400 (35.56)
BACK VIEW
Lead Length (50.5) min. 0.35 (8.9) Diameter
SIDE VIEW
0.250 (6.35)
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
01/27/09
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_ACA5-20RM.A01 Page
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