www.murata-ps.com ACA5-20RM Series True-rms-AC Ammeters with 5A CT Inputs C US E156931 FEATURES Murata Power Solutions ACA5-20RM Series accept the output of external 5A current transformers (CTs) and accurately display the true-rms value of complex, non-sinusoidal ac Scales and displays the true-rms output of 5A current currents up to 500A. Operation and setup is straightforward: simply pass the external 5A transformers CTs secondary 0-5A output leads through the ACA5-20RMs on-board toroid sensor, apply Accurately measure complex ac current waveforms ac power, and the ammeter is fully operational. All models are totally self-containedother Perfect for measuring current in IT applications than the external 5A CT, no other user-supplied components are required. Three input ranges measure 0-100.0 amps (with 0.1A resolution), 0-200 amps (0.1A Available in three input ranges: 0-100A, 0 to 200A, resolution), and 0-500 amps (1A resolution). Two power supply options are available: or 0 to 500A 85-140V (47-63Hz), and 170-264V (47-63Hz). Power consumption from a nominal 120V Functionally complete: or 220V ac supply is less than 50mA. And, precision auto-zeroing circuitry, super-stable On-board, low-burden toroid sensor components, and an rms-to-dc converter circuit combine to achieve excellent performance Scaling/interface circuitry when measuring the complex, non-sinusoidal, ac currents found in todays computer/telecom Precision A/D converter equipment. Reliable single-board construction ACA5-20RM Series rms 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. Easy-to-read, red LED display with 0.37 /9.4mm digits They are also panel-cutout compatible with Murata Power Solutions DMS-20RM Series Two AC power options: 85-140Vac & 170-264Vac of rms-reading ac voltage monitors, making ACA5-20RM ammeters perfect replace- (50/60Hz) ments for older, less reliable, analog voltmeters and ammeters in todays sophisticated 2000V isolation between ac supply and external CT instrumentation. Digital replacement for analog meters Approvals to UL/cUL/IEC/61010-1 PRECISION rms-to-DC CONVERTER BUILT-IN TOROID L1 SENSOR AB TB1 For full details go to www.murata-ps.com/rohs Figure 1. ACA5-20RM Series simpli ed schematic www.murata-ps.com/support MPM ACA5-20RM.B01 Page 1 of 5ACA5-20RM Series True-rms-AC Ammeters with 5A CT Inputs Performance/Functional Speci cations The speci ed full-scale current is the ac current circulating through the meters built-in 5A current transformers primary circuit L1 (i.e., the external current Typical at TA = +25C, unless otherwise noted. transformers 0-5A output current). Full-Scale Primary Current Min. Typ. Max. Units The overcurrent rating of 1.5 times the rated full-scale current is a continuous All Models 5.0 rms Amps rms rating and applies to the current passing through the built in current trans- former (CT). Accuracy is only guaranteed up to the rated full-scale CT current of 1.5 x Rated full-scale rms current Overcurrent Rating 5Arms. Display Readings with 5A Flowing through the Ammeters Current Transformer Speci ed accuracy applies to inputs with crest factors (CF) up to 2.0, where CF Model Number Display Reading = Vpeak/Vrms. Crest factors of 2 to 5 introduce an additional error of 3% of full scale. Ammeters are calibrated with a 5.00Arms/60Hz current owing through ACA5-20RM-3-ACX-RL 100.0 the ammeters built-in 5A CT. ACA5-20RM-5-ACX-RL 199.9 All speci ed maximum power supply currents are steady state larger surge ACA5-20RM-9-ACX-RL 500 currents can occur at initial turn-on. Performance Sampling Rate 2.5 Samples per second Ordering Information 0.4%FS 3 Counts with 60Hz ACA5-20RM-3-AC3-RL-C 100.0A Range, 85-140Vac power Accuracy Sine-Wave Input ACA5-20RM-3-AC4-RL-C 100.0A Range, 170-264Vac power Input Frequency Range 4763 Hz ACA5-20RM-5-AC3-RL-C 199.9A Range, 85-140Vac power Measurement Type rms Responding, Crest Factors of 1-5 ACA5-20RM-5-AC4-RL-C 199.9A Range170-264Vac power Temperature Drift (0 to 60 C) 0.2 0.4 Cnts/C ACA5-20RM-9-AC3-RL-C 500A Range, 85-140Vac power Zero-Current Reading (within 30 sec.) 001 000 001 Cnts ACA5-20RM-9-AC4-RL-C 500A Range, 170-264Vac power Breakdown Voltage 2000 Vdc UL/IEC61010-1 Measurement category II See www.murata-ps.com/dpm-availability for model-speci c availability. Power Supply Voltage Accessory Current Transformers for above*: ACA5-20RM-X-AC3-RL 85 120 140 Vac/47-63Hz ACA5-20RM-X-AC4-RL 170 220 264 Vac/47-63Hz 7020-01038-0 100A Current Transformer, RoHS compliant 7020-01040-0 200A Current Transformer, RoHS compliant Power Supply Current 39-3681409 500A Current Transformer, not RoHS compliant ACA5-20RM-X-AC3-RL 30 50 mA/47-63Hz ACA5-20RM-X-AC4-RL 30 50 mA/47-63Hz * See data sheet titled Current Transformers at www.murata-ps.com for more information. Power Supply Terminal Block (all models) Wire Size 16-22AWG, Solid or stranded TECHNICAL NOTES Insulation Strip Length 0.250 inches IMPORTANT To ensure safe and reliable operation, ACA5-20RM Screw Tightening Torque 2.2 lbin (0.25 Nm) 20% ammeters must be installed and serviced by quali ed technical Rated Voltage 310Vac personnel. Contact Murata Power Solutions if there is any doubt regarding ammeter installation and/or operation. Display Display Type and Size 3 Digit Red LED, 0.37/9.4mm High 1. Measurement Type: ACA5-20RM ac ammeters employ a true rms input circuit to measure the output of external 5A current transform- Overrange Indication 1 ers. Stated accuracy speci cations are measured using a sine-wave Model dependent see Display Reading/Decimal Point current at, or close to, the full-scale input range, at nominal line Display Readings above frequency of 60Hz. Physical/Environmental 2. Calibration: Periodic recalibration of ACA5-20RM ammeters is Operating Temperature 0 +60 C not required under normal, indoor operating environments. If user Storage Temperature 40 +75 C calibration is necessary, it should be performed by quali ed technical Humidity (non-condensing) 85 % personnel. Calibration is performed with potentially lethal voltages Dimensions Model dependent, see page 4 & 5 applied to the ACA5-20RM and its associated wiring, with 5.0 amps Weight owing through the ammeters built-in toroid sensor. A plastic, fully-insulated adjusting tool must be used to access the calibration All models 1.1 Ounces (31 grams) nominal potentiometer located on the back of the meter (see Mechanical Speci cations). Contact MPS if additional information is required regarding calibration, setup, or any other technical issue pertaining to ACA5-20RM ammeters. www.murata-ps.com/support MPM ACA5-20RM.B01 Page 2 of 5