True-rms-AC Ammeters with Alarm Function User-settable, visual al

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True-rms-AC Ammeters with Alarm Function User-settable, visual al

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ACA-20RM-ALM Series
True-rms-AC Ammeters with Alarm Function
User-settable, visual alarm function Flashing display indicates overcurrent faults Measures true-rms value complex current waveforms Includes built-in current transformers Ideal measuring current sensitive applications Available input ranges: 0-30.0A, model features convenient split-core Easy-to-read, display with 0.37"/9.4mm high digits power options: 85-140Vac 170-264Vac (50/60Hz) 2000V isolation between supply load conductor
Murata Power Solutions' ACA-20RM-ALM Series digital ammeters accurately display true-rms value non-sinusoidal currents provide user-settable, over current alarm function. When preset over current level exceeded, display continuously flashes from high intensity. models totally self-contained-no other user-supplied components required. built-in current transformer greatly simplifies most ammeter applications: just pass load conductor through built-in current transformer, apply power, ammeter fully operational. input ranges available: 0-30.0 Amps, 50.0 Amps, both with 0.1A resolution. model features convenient split-core type current transformer which clamped around insulated live conductors. power supply options available: 85-140V (47-63Hz), 170-264V (47-63Hz). Power consumption from nominal 120V 220V supply less than 50mA. 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-ALM Series true-rms ammeters feature full-size, 0.37" (9.4mm) high, digit, bright LED-displays built-in bezel/filter assembly that includes metal fasteners. They also panel cutout compatible with MPS's DMS-20RM Series rmsreading voltage monitors, making ACA-20RM-ALM ammeters ideal upgrade 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
Figure ACA-20RM-ALM Series simplified schematic
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MPM_ACA-20RM-ALM.A01 Page
ACA-20RM-ALM Series
True-rms-AC Ammeters with Alarm Function
Performance/Functional Specifications
Typical +25°C, unless otherwise noted. Rated Full-Scale Current ACA-20RM-4-ACX-RL-ALM ACA-20RM-5-ACX-RL-ALM 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-ALM ACA-20RM-X-AC4-RL-ALM Power Supply Current ACA-20RM-X-AC3-RL-ALM ACA-20RM-X-AC4-RL-ALM Alarm Function Display indication Settable range ACA-20RM-4-ACX-RL-ALM ACA-20RM-5-ACX-RL-ALM 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 (non-condensing) Dimensions Weight ACA-20RM-4-XXX-XX-ALM ACA-20RM-5-XXX-XX-ALM 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 Amps Amps Flashing Display with actual current reading display intensity change 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 Counts Min. Typ. Max. 50.0 30.0 Units Amperes Amperes 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-4-AC3-RL-ALM-C ACA-20RM-4-AC4-RL-ALM-C ACA-20RM-5-AC3-RL-ALM-C ACA-20RM-5-AC4-RL-ALM-C 50.0A Range (split-core CT), 85-140Vac power 50.0A Range (split core CT), 170-264Vac power 30.0A Range, 85-140Vac power 30.0A Range, 170-264Vac power
TECHNICAL NOTES
IMPORTANT! ensure safe reliable operation, ACA-20RMALM ammeters must installed serviced qualified technical personnel. Contact Murata Power Solutions there doubt regarding ammeter setup, installation, operation. Measurement Type: ACA-20RM-ALM ammeters employ true-rms input circuit measure current flowing through Stated accuracy specifications measured using sine-wave current close ammeter's full-scale input range, nominal line frequency 60Hz. Calibration (Potentiometer R7): Periodic recalibration ACA20RM-ALM ammeters required under normal, indoor operating environments. user calibration necessary, must performed qualified technical personnel. Calibration performed with potentially lethal voltages applied ACA-20RM-ALM associated wiring. plastic, fully-insulated adjusting tool must used access calibration potentiometer located back ammeter (see `Mechanical Specifications' section). Contact additional information required regarding calibration, setup, other technical issue pertaining ACA-20RM-ALM ammeters. Overcurrent Alarm Setup Adjustment (Potentiometer R3): ACA-20RM-ALM ammeters feature user-settable, overcurrent visual alarm indication which used alert operators that load circuit breaker fuse approaching overload condition. When load current sensed exceeds this preset level, ammeter's display will flash from normal intensity intensity rate approximately times second. shown Figure alarm circuit consists jumper JP1, adjustment potentiometer shipped, factory trip when load current approximately Amps models, approximately Amps models. When maximum clockwise position, alarm indication will activate until load current flowing through exceeds maximum rating ammeter, i.e., above 30.0A, above 50.0A, depending model.
Technical enquiries email: sales@murata-ps.com, tel: 3000
Model dependent, page
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MPM_ACA-20RM-ALM.A01 Page
ACA-20RM-ALM Series
True-rms-AC Ammeters with Alarm Function
adjust overcurrent alarm set-point level: Turn power ACA-20RM-ALM (i.e., power source connected TB1). Carefully remove shorting jumper across from `normal operation position' across terminals place across terminals Re-apply power and, using plastic insulated adjusting tool, adjust ammeter's display shows desired overcurrent trip level Amps. Turn power ACA-20RM-ALM return JP1'a shorting jumper back `normal operation position' across terminals Re-apply power resume normal operation. possible, after ammeter re-configured normal operation, load current should slowly increased verify visual alarm operates when load current exceeds preset level. Please note, load circuit does need turned adjust overcurrent alarm point. Current flowing through while across terminals will measured. Once tripped, alarm point function hysteresis approximately 0.5A. overcurrent alarm function also adjusted with normal operation position desired alarm overcurrent-level actually flowing through (i.e., with live load). example, with load current flowing through with normal operation position, slowly adjust until display starts flashing off. Using this "live load" adjustment method eliminates need turn power reconfiguring JP1. Wire Gauges Fusing: Wires specified Functional Specifications section must used making connections ACA-20RM-ALM 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 products draw significantly higher surge currents brief periods when line voltage initially applied. Supply Polarity Grounding: supply inputs, TB1-A TB1-B, ACA-20RM-ALM ammeters themselves polarity sensitive, that they have internal designations. ACA-20RM-ALM ammeters include require connection earth/chassis ground.
Connector Torque Ratings: important tighten TB1's, screwterminals their rated torque specification pound-inches (0.4Nm). Proper tightening will minimize connector losses ensure safe, reliable operation. Isolation: built-in current transformer provides minimum 2000Vdc isolation between load conductor ammeter's supply voltage connected TB1. Split-Core (Clamp-on) Models: Both models feature splitcore current transformer that clamped around properly insulated live conductor without having disconnect remove power from load circuit. This live-connection capability only used load's power source electrically 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.
BACK VIEW
FUSED POWER
LOAD
Figure Typical wiring diagram
BACK VIEW
ALARM
Normal Operation
Overcurrent Alarm Adjustment
Figure Alarm circuit component location
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MPM_ACA-20RM-ALM.A01 Page
ACA-20RM-ALM Series
True-rms-AC Ammeters with Alarm Function
PANEL INSTALLATION
connections ACA-20RM-ALM 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 current transformer 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 ACA-20RMALM 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)
ACA-20RM Ammeter
SIDE VIEW
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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MPM_ACA-20RM-ALM.A01 Page
ACA-20RM-ALM Series
True-rms-AC Ammeters with Alarm Function
MECHANICAL SPECIFICATIONS
MODELS FRONT VIEW
2.100 (53.34)
100-10 100-10
SPLIT-CORE MODELS FRONT VIEW
2.100 (53.34)
100-10 100-10
1.400 (35.56)
1.400 (35.56)
BACK VIEW
BACK VIEW
Lead Length (127.0) min.
Lead Length (50.5) min. 0.35 (8.9) Diameter
1.575 (40.00)
0.40 (10.2) Diameter
SIDE VIEW
MECHANICAL DIMENSIONS: Inches (mm) TOLERANCES: ±0.02 (±0.51) ±0.010 (±0.254)
0.984 (24.99)
SIDE VIEW
1.024 (26.01)
0.250 (6.35)
0.480 (12.19)
0.250 (6.35) 0.480 (12.19)
0.551 (14.00)
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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