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SIMPLIFIED SCHEMATIC DIAGRAM PRODUCT OVERVIEW Murata Power Solutions’ ACM3P series 3-phase AC ammeters measure and display the true-rms values of 2- or 3-phase ac mains current. A front panel touch switch enables the selection of a continuous reading of any of the three phases. All ACM3P ammeters are func- tionally complete, with built-in L1, L2, and L3 current transformers—no other user-supplied components or hardware are required. ACM3P series AC ammeters are available with a 0-100A input range (150A peaks) and provide a resolution of 0.1 Amp. Their 85-264Vac (47-63Hz) operating supply range makes these ammeters perfect for worldwide 3-phase current monitoring applications. And, unlike conventional average-responding products, ACM3P ammeters can accurately display the true-rms values of triangle waves, square waves, and other irregularly shaped AC current waveforms, with an accuracy of ±2% of full scale. Their large (0.36"/9.2mm), bright LED display, available in a choice of red, blue, or green, enables ACM3P ammeters to be easily readable from as far as 15 feet (5 meters). All units are packaged in a one-piece, vibration resistant, polycarbonate housing that can be installed in vertical ‘0U’ or horizontal ‘1U’ rack spaces. Their miniature size is ideal for UPS backup power sources, power strips, alternative energy metering, and any other applica- tions that require precise monitoring of 2- or 3-phase ac current. A B 85-264 Vac 47-63 Hz AC/DC CONVERTER MICRO- CONTROLLER SEL +5V +5V +5V A/D CONVERTER L1 L2 L3 PHASE 3 PHASE 1 L1PHASE 2 CURRENT LIMITED SUPPLY Actual size

FEATURES

Measure and display the true-rms current of 3-phase power systems Universal 85-264Vac (47-63Hz) operating supply range Three built-in current transformers measure up to 100A per phase Ideal for power distribution units (PDUs) and backup power systems Low power consumption: less than ¼watt from 120Vac supply One-piece polycarbonate housing fi ts ‘0U’ & ‘1U’ rack spaces Low-profi le surface mount design occupies minimal behind-the-panel space Available in red, green, or blue LED-displays with phase annunciators Low Cost; approvals to UL/cUL/IEC/61010-1 C ® US E156931 www.murata-ps.com www.murata-ps.com/support For full details go to www.murata-ps.com/rohs Ḥ ACM3P Series Three-Phase AC Ammeters MPM_ACM3P Series.B01 Page 1 of 6 s

Performance/Functional Specifi cations Typical at TA=+ 25ºC, 120Vac @ 50Hz, unless otherwise noted

ORDERING INFORMATION

ACM3P-4-AC1-R-C 100A, 85-264Vac Supply, Red LED Display ACM3P-4-AC1-G-C 100A, 85-264Vac Supply, Green LED Display ACM3P-4-AC1-B-C 100A, 85-264Vac Supply, Blue LED Display TECHNICAL NOTES IMPORTANT! To ensure safe and reliable operation, ACM3P amme- ters must be installed and serviced by qualifi ed technical personnel. Contact Murata Power Solutions if there is any doubt regarding their installation or operation. 1. Measurement Type: ACM3P series 3-phase ammeters employ a precision energy metering integrated circuit and a low-power micro- controller to measure and display the rms value of 2- or 3-phase ac-mains current. However, while the unit has an upper bandwidth of 14kHz, dc components or frequencies below 47Hz will not be measured accurately. 2. Basic Operation : Upon application of ac power to TB1, the unit will fi rst perform a self-test routine and then continuously display amperes, with one of the three phase-annunciator LEDs illuminated (L1, L2, or L3). The display will remain fi xed in one of these reading modes as long as the front panel ‘SEL’ button is not touched. Assum- ing phase L1 is initially illuminated, momentarily touching the ‘SEL’ button two times in succession will cycle the display to phase L2, and then to phase L3. Momentarily touching ‘SEL’ a third time will return the unit back to displaying phase L1 current. If power is removed and then restored, the ACM3P will perform a self-test and then return to displaying the last selected phase, i.e., the phase it displayed just before power was removed. Confi guring for 2-Phase Operation: As shipped, ACM3P ammeters are confi gured to measure and display 3-phase currents (L1, L2, and L3 current transformers are all active). The unit can be set to display 2-phase currents (only L1 and L2 are active) by performing the fol- lowing procedure: A. Press and hold the SEL button for approximately fi ve seconds and then release the button once the words “LinE SEt” appear on the display. B. Briefl y tapping the SEL button will alternate the display reading between ‘2-Ph’ and ‘3-Ph’ each time SEL is tapped. C. To change the factory default 3-phase mode to 2-phase, leave the display fi xed in the ‘2-Ph’ reading for at least fi ve seconds. To revert the unit back to 3-phase operation simply repeat the above procedure but, in step C, allow the unit to display a fi xed ‘3-Ph’ for at least fi ve seconds. 3. Overrange Indication: ACM3P ammeters have an overcurrent rat- ing of 1.5 times rated current, or 150A. However, accuracy is only guaranteed up to 100A, and the display will fl ash on and off when the current is at or above 120A. 4. Calibration: Due their digital design, ACM3P ammeters cannot be calibrated in the fi eld. ACM3P ammeters are factory-calibrated to meet their specifi ed accuracies with the factory supplied current transformers. Use of any other current transformers will produce signifi cant errors. Contact Murata Power Solutions if additional information is required regarding calibration, setup, or any other technical issue pertaining to ACM3P ammeters. Measurement Limits Min. Typ. Max. Units AC (rms) Current, L1, L2, L3 ➀ 0.0 — 100.0 Amperes Overcurrent Rating ➁ 1.5 x Rated full-scale current Performance Sampling Rate 1.5 samples/sec Current Accuracy ➂ ±2% ±3% Measurement Bandwidth (L1, L2, L3) 14kHz Temperature Drift (0 to 60ºC) 0.5 Counts/ºC Zero-Current Reading (within 1 sec.) 1 Counts UL/IEC61010-1 Measurement category II Supply Voltage (TB1) All Models 85 120 264 Vac/47-63Hz Supply Current ➃ ACM3P-X-AC1-R-X-C 35 50 110 mA ACM3P-X-AC1-G-X-C 50 75 165 mA ACM3P-X-AC1-B-X-C 50 75 165 mA Power Supply Terminal Block (TB1) Wire Size 16-22AWG, solid or stranded Insulation Strip Length 6.4mm (0.250 in) Screw Tightening Torque 0.4Nm (3.6 lb-in) Rated Voltage 300Vac Display Display Type and Size 4 Digit LED, 9.14mm (0.36in) high Overrange Indication Flashing display Decimal Point Selection Automatically Set Physical/Environmental Operating Temperature: 0 — +60 ºC Storage Temperature: -40 — +75 ºC Humidity (non-condensing): 0 — 85 % Dimensions: See mechanical specifi cations Weight, all models 2.6 oz (74g) Notes ➀ Specifi ed full-scale currents are those passing through the power meter’s built-in current transformer’s primary load-circuit. See Notes 2 and 3 below for additional information. ➁ 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. Accuracy is guaranteed up to the rated current level. ➂ Power Meters are calibrated with near full-scale 50Hz sine-wave inputs. ➃ All specifi ed maximum supply currents are steady state. Larger surge currents can occur at initial application of line power. www.murata-ps.com/support ACM3P Series Three-Phase AC Ammeters MPM_ACM3P Series.B01 Page 2 of 6

  1. Wiring: All power supply and load wiring must be rated for the volt-
  2. Supply Fusing, and Grounding: Wires specifi ed in the Functional

delay/time lag fuse, in accordance with applicable regulatory codes. is not pinched by the screw terminal.

  1. Current Transformer Phasing: Since the ACM3P only measures

hole of each of the three built-in current transformers.

  1. Connector Torque Ratings: It is important to tighten TB1’s screw-
  2. Isolation: Except for the 2-56 thread metallic mounting studs, all of

in Technical Notes 5 and 6 above. never exceed the maximum rating of 264V/47-63Hz. Figure 1. Panel Installation all safety measures applicable to the user’s installation. strain reliefs be used for all wiring. installation and/or adversely affect the reliability of the installation. supplied hardware or modifi cations.

1.43 (36.3) 2.10 (53.3) Front View Back View 0.51 (12.95) 1.07 (27.20) 0.40 (10.16) 0.12 (3.05) (min) 0.12 (3.05) (min) Side View 1.63 (41.4)

0.086 DIA (REF)

0.33 (8.39) (min) 0.22 (5.59) (min) 0.60 (15.24) (max) Bottom View B A TB1 Lead Length 5.0 (127) min. Diameter: Inner: 0.57 (14.5) Outer: 1.175 (29.8) PANEL CUTOUT RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS INTERNAL CORNER RADII: 0.032 (0.81) MAX. 1.07 (27.18) 0.870 (22.10) 1.426 (36.22) 1.626 (41.30) 0.093 (2.362) DIAMETER (4 REQUIRED) The panel opening must be centered vertically and horizontally between the four 0.093 (2.362mm) diameter holes. Dimensions are in inches (mm). Tolerances (unless otherwise specifi ed): .XX ± 0.02 (0.51) Angles ± 2˚ Components are shown for reference only. www.murata-ps.com/support ACM3P Series Three-Phase AC Ammeters MPM_ACM3P Series.B01 Page 5 of 6

  1. Description of safety marks: Caution, risk of electrical shock Caution, risk of danger Equipment is protected throughout by double or reinforced insulation 2. Cleaning Instructions: Gently clean with dry cloth only. 3. Caution: if the equipment is used in a manner not specifi ed by Murata Power Solutions, the protection provided by the equipment may be impaired. www.murata-ps.com/support Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without notice. © 2015 Murata Power Solutions, Inc. Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/ ACM3P Series Three-Phase AC Ammeters MPM_ACM3P Series.B01 Page 6 of 6