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ACA-20RM-5-AC3-RL-ALM-C Datasheet(PDF) 2 Page - Murata Power Solutions Inc. |
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ACA-20RM-5-AC3-RL-ALM-C Datasheet(HTML) 2 Page - Murata Power Solutions Inc. |
2 / 5 page MPM_ACA-20RM-ALM.A01 Page 2 of 5 ACA-20RM-ALM Series True-rms-AC Ammeters with Alarm Function Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com TECHNICAL NOTES IMPORTANT! To ensure safe and reliable operation, ACA-20RM- ALM ammeters must be installed and serviced by qualified technical personnel. Contact Murata Power Solutions if there is any doubt regarding ammeter setup, installation, or operation. 1. Measurement Type: ACA-20RM-ALM ac ammeters employ a true-rms input circuit to measure current flowing through L1. Stated accuracy specifications are measured using a sine-wave current at, or close to, the ammeter’s full-scale input range, at nominal line frequency of 60Hz. 2. Calibration (Potentiometer R7): Periodic recalibration of ACA- 20RM-ALM ammeters is not required under normal, indoor operating environments. If user calibration is necessary, it must be performed by qualified technical personnel. Calibration is performed with poten- tially lethal voltages applied to the ACA-20RM-ALM and its associated wiring. A plastic, fully-insulated adjusting tool must be used to access the calibration potentiometer R7 located on the back of the ammeter (see ‘Mechanical Specifications’ section). Contact MPS if additional information is required regarding calibration, setup, or any other technical issue pertaining to ACA-20RM-ALM ammeters. 3. Overcurrent Alarm Setup and Adjustment (Potentiometer R3): ACA-20RM-ALM ammeters feature a user-settable, overcurrent visual alarm indication which can be used to alert operators that a load cir- cuit breaker or fuse is approaching an overload condition. When the load current sensed by L1 exceeds this preset level, the ammeter’s LED display will flash from normal intensity to dim intensity at rate of approximately 1.5 times per second. As shown in Figure 3, the alarm circuit consists of jumper JP1, and adjustment potentiometer R3. As shipped, R3 is factory set to trip when the load current is approximately 24 Amps for 30A models, and approximately 45 Amps for 50A models. When R3 is set to its maxi- mum clockwise position, the alarm indication will not activate until the load current flowing through L1 exceeds the maximum rating of the ammeter, i.e., above 30.0A, or above 50.0A, depending on the model. Performance/Functional Specifications Typical at TA = +25°C, unless otherwise noted. Specified full-scale currents are those passing through the ammeter’s built-in current transformer’s primary load-circuit. See Notes 2 and 3 below for ad- ditional model-specific information. The overcurrent rating of 1.5 x the rated full-scale current is a continuous rating 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 guaranteed up to the rated current level. Specified accuracy applies to inputs with crest factors (CF) up to 2.0, where CF = 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 flowing through the ammeter’s built-in CT. All specified maximum power supply currents are steady state; larger surge currents can occur at initial application of line power. Rated Full-Scale Current Min. Typ. Max. Units ACA-20RM-4-ACX-RL-ALM — — 50.0 Amperes ACA-20RM-5-ACX-RL-ALM — — 30.0 Amperes Overcurrent Rating 1.5 x Rated Full-Scale Current Performance Sampling Rate 2.5 Samples per second Accuracy ±0.4%FS ±3 Counts with 60Hz Sine-Wave Input Measurement Type rms Responding, Crest Factors of 1-5 Temperature Drift (0 to 60 °C) — ±0.2 ±0.4 Counts/ºC Zero-Current Reading (within 30 sec.) –001 000 001 Counts Dielectric Withstanding Voltage 2000 — — Vdc Power Supply Voltage ACA-20RM-X-AC3-RL-ALM 85 120 140 Vac/47-63Hz ACA-20RM-X-AC4-RL-ALM 170 220 264 Vac/47-63Hz Power Supply Current ACA-20RM-X-AC3-RL-ALM — 30 50 mA/47-63Hz ACA-20RM-X-AC4-RL-ALM — 30 50 mA/47-63Hz Alarm Function Display indication Flashing Display with actual current reading and display intensity change Settable range ACA-20RM-4-ACX-RL-ALM 13 45 50 Amps ACA-20RM-5-ACX-RL-ALM 8 24 30 Amps Power Supply Terminal Block Wire Size 16-22AWG, Solid or stranded Insulation Strip Length 0.250 inches Screw Tightening Torque 3.6 pounds-inches (0.4Nm) Rated Voltage 310Vac Display Display Type and Size 3½ Digit Red LED, 0.37”/9.4mm High Overrange Indication “1___” Decimal Point Fixed, model dependent (see full-scale input current) Physical/Environmental Operating Temperature 0 — +60 °C Storage Temperature –40 — +75 °C Humidity (non-condensing) 0 — 85 % Dimensions Model dependent, see page 4 & 5 Weight ACA-20RM-4-XXX-XX-ALM 1.5 Ounces (43 grams) nominal ACA-20RM-5-XXX-XX-ALM 2.1 Ounces (60 grams) nominal Ordering Information ACA-20RM-4-AC3-RL-ALM-C 50.0A Range (split-core CT), 85-140Vac power ACA-20RM-4-AC4-RL-ALM-C 50.0A Range (split core CT), 170-264Vac power ACA-20RM-5-AC3-RL-ALM-C 30.0A Range, 85-140Vac power ACA-20RM-5-AC4-RL-ALM-C 30.0A Range, 170-264Vac power |
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