ACM20 Series www.murata-ps.com Four-Function AC Power Meters New! Low-Wattage Models Available PRODUCT OVERVIEW Actual size C® US E156931 Murata Power Solutions’ ACM20 series AC power meters display the most critical measure- ments in mains-powered equipment: voltage, amperage, active power (watts), and power FEATURES factor. A front panel selector-switch provides two modes of operation: a fixed reading of any of the four parameters, or a continuous cycling through all four measurements. An n Displays AC Volts, Amps, Watts, and Power Factor or Hertz optional model displays line frequency with 0.1Hz resolution. All ACM20 multi-function n Two display modes: continuous auto cycling or fixed power meters include built-in current transformers—no other user-supplied components n Universal 85-264Vac (47-63Hz) operating range are required. (Measurement Category II) ACM20 series AC power meters are available in a choice of three input ranges: 0-10A (with n Built-in current transformers simplify installation; choice of 0.001A resolution, 999.9 watts max.); 0-32A (with 0.01A resolution, 9999 watts max.); and 10A, 32A, or 100A ranges 0-100A (0.1A resolution, 26.4kW max.). An 85-264Vac (47-63Hz) operating supply range n Ideal for power distribution units (PDUs) and power strips makes these power meters perfect for worldwide power monitoring applications. And, unlike conventional, average-responding products, ACM20 power meters can accurately n True-rms readings of complex voltage and current waveforms display the real power and true-rms current values of triangle waves, square waves, and n Low-power consumption: less than ¼watt from 120Vac other irregularly shaped waveforms, with a typical accuracy of ±1% of full scale. n One-piece polycarbonate housing fits ‘0U’ & ‘1U’ racks Their large (0.36"/9.2mm), bright red LED display makes ACM20 AC power meters easily n Surface mount design occupies minimal panel space readable from as far as 15 feet (5 meters). All units are packaged in a one-piece, vibration n Bright red LED-display with four annunciators resistant, polycarbonate housing that can be installed in vertical ‘0U’ and ‘1U’ rack spaces. Their miniature size is perfect for UPS power sources, power strips, laboratory instrumenta- n Optional Frequency reading models (0.1Hz resolution) tion, alternative energy applications, and any other products that require precise monitoring n Approvals to UL/CSA/IEC/EN 61010-1 of AC power. SIMPLIFIED SCHEMATIC DIAGRAM VOLTS AMPS WATTS PF LOAD CURRENT +5V L1 A/D CONVERTER +5V CURRENT B LIMITED +5V 85-264 Vac AC/DC MICRO- A 47-63 Hz CONVERTER CONTROLLER SUPPLY For full details go to www.murata-ps.com/rohs SEL www.murata-ps.com/support MPM_ACM20 Series.D02 Page 1 of 7

ACM20 Series Four-Function AC Power Meters Performance/Functional Specifications Typical at TA=+ 25ºC, 120Vac @ 60Hz, unless otherwise noted Measurement Limits Min. Typ. Max. Units ORDERING INFORMATION AC Voltage 85.0 - 264.0 Volts See page 7 for all active part numbers and descriptions. AC Current, 10A models (1) 0.00 - 9.999 Amperes AC Current, 32A models (1) 0.00 - 32.00 Amperes AC Current, 100A models (1) 0.0 - 100.0 Amperes Active Power: 10A models 0 - 999.9 Watts Active Power: 32A models 0 - 9999 Watts Active Power: 100A models 0 - 26.4 kW Frequency 47.0 - 63.0 Hz TECHNICAL NOTES Power Factor .00 1.00 - - IMPORTANT! To ensure safe and reliable operation, ACM20 power Overcurrent Rating (2) 1.5 x rated full-scale current meters must be installed and serviced by qualified technical person- Performance nel. Contact Murata Power Solutions if there is any doubt regarding Sampling Rate 2-3 samples / sec their installation or operation. Voltage Accuracy (3) ±1% 1. Measurement Type: ACM20 series multifunction AC power meters Current Accuracy (3) ±1% ! employ a precision energy metering integrated circuit and a low- Power Accuracy (3) ±2% power microcontroller to measure and display the rms voltage and current, active (real) power, power factor (or line frequency on ‘–F’ Frequency Accuracy (3) ±0.1 Hz suffix models) of ac mains supplies from 47-63Hz. Please note, Power Factor Accuracy ±3% ACM20 power meters use the voltage present at their TB1 terminal Measurement Bandwidth 140Hz (Voltage), 14kHz (Current) block and the secondary current of their built-in current transformer Temperature Drift (0 to 60ºC) 0.5 Counts/ºC L1 to calculate and then display VOLTS, AMPS, WATTS, power factor (PF), or line frequency on ‘-F’ HERTZ models. Zero-Current Reading (within 2 sec.) 0.00 Amps Zero-Power Reading (within 2 sec.) 0 Watts While the ACM20 displays the rms value of line voltage and line current, the VOLTS reading has an upper limit of 140Hz (-3db point), UL/IEC61010-1 Measurement category II which means rectangular-shaped voltage waveforms, and waveforms Supply Voltage (TB1) (Measurement Category II) with sharp transitions, will read lower than their true-rms value. For All Models – 47-63 Hz 85 120 264 Vac example, a square wave line voltage will read approximately 1-2% Supply Current (4) lower, a triangle wave will read 3% lower, and a modified sine wave All Models 35 50 110 mA will read 18% lower. The oscillograms on page seven illustrate typical ACM20 VOLTS readings when powered from four ac waveforms. Power Supply Terminal Block The 140Hz bandwidth limit does not apply to the WATTS reading nor Wire Size 16-22AWG, solid or stranded to the AMPS reading. The circuitry used for these two measurements Insulation Strip Length 6.4mm (0.250 in) has an upper bandwidth of 14kHz. ACM20 power meters are mains Screw Tightening Torque 0.4Nm (3.6 lb-in) operated devices designed to measure ac currents and voltages, Rated Voltage 300Vac within the specified limits previously noted. DC currents and voltages Display will not be measured accurately. Display Type and Size 4 Digit LED, 9.14mm (0.36in) high 2. Basic Operation: Upon application of ac power to TB1, the unit will Overrange Indication Flashing ‘9999’ Watts (5) first perform a self-test routine and then continuously display ac volts with the VOLTS LED annunciator illuminated. The display will remain Decimal Point Selection Automatically Set in the VOLTS mode as long as the front panel ‘SEL’ button is not Physical/Environmental touched. Operating Temperature 0 – +60 °C After the unit powers up to normal operation in the VOLTS reading Storage Temperature –40 – +75 °C mode, momentarily (approximately one second) touching the ‘SEL’ Humidity (non-condensing) 0 – 85 % button on the unit’s front panel three times in succession will cycle Dimensions See mechanical specifications the display to AMPS, WATTS, and end at PF (or HERTZ for ‘–F’ mod- Weight: 32A models 1.3oz (37.9g) els). Momentarily touching ‘SEL’ a fourth time will return the display Weight: 100A models 1.5oz (43.5g) back to the VOLTS reading mode. Hex Nut Tightening Torque 0.14 N-m (20 ozf-in) Holding the ‘SEL’ button down for 3 seconds will place the unit in a continuous auto-cycling mode, and the display will repetitively scroll (1) Specified full-scale currents are those passing through the power meter’s built-in current transformer’s primary load-circuit. through all four measurements, with each measurement remaining (2) The overcurrent rating of 1.5 x the rated full-scale current is a continuous rating and displayed for 3 seconds. applies to the current passing through the built in current transformer. Accuracy is guaran- teed up to the rated current. When the continuous auto-cycling mode is initially selected, the unit (3) ACM20 Power Meters are calibrated with near full-scale 60Hz sine-wave inputs. will briefly display ‘Auto On’ before continuous cycling begins. Mo- (4) All specified maximum supply currents are steady state; larger surge currents can occur at initial application of line power. mentarily touching the ‘SEL’ button again will cause the unit to briefly (5) Applies to 10A and 32A models only. display ‘Auto OFF’ before it returns to the fixed VOLTS reading mode. www.murata-ps.com/support MPM_ACM20 Series.D02 Page 2 of 7

ACM20 Series Four-Function AC Power Meters Displaying a specific mode on power up: Units manufactured after ACM20 series power meters are not internally fused. Terminal block February 2012 can be configured to automatically show any one TB1 is to be used only for powering the power meter's internal circuitry; of the four display modes upon future applications of ac power. For it must not be used to supply power to external loads. The supply wires example, it may be desirable to configure the unit to always power up feeding these power meters must be fused with a 0.5A/250V time in the AMPS mode. delay/time lag fuse, in accordance with applicable regulatory codes. To set the unit to always read AMPS on power up, tap the SEL switch Wire insulation must be stripped to within ±10% of the stated dimen- until the AMPS mode is displayed, and then leave the unit in this mode sions, and wires should be inserted into TB1 such that their insulation for at least 60 seconds. As long as the SEL switch is not pressed is not pinched by the screw terminal. again during the 60 second interval, the unit will configure itself to 6. Current Transformer Polarity: In order to perform accurate Watts always power up displaying the chosen mode, which is AMPS in this and Power Factor measurements, connections to the two rear power example. supply inputs, TB1-A and TB1-B, and built-in current transformer L1 In summary, operating the unit undisturbed in a particular display must have the proper polarity. That is, the load current flowing in the mode for 60 seconds or longer will automatically configure the unit wire passing through L1's center hole must have the same polarity as to display that particular mode the next time ac power to the unit is the line voltage connected to TB1-A and TB1-B. cycled off and back on. This functionality also applies to the auto- The wiring diagrams in Figures 1-4 ensure that, for a purely resistive cycle mode, that is, the unit can be configured to always power up in load, current flowing in current transformer L1’s primary circuit will the auto-cycle (scrolling) display mode by following the instructions have the same polarity as the applied voltage at TB1. If proper polarity outlined above. is not followed, the Watts and Power Factor readings will be zero. To 3. Calibration: Due their digital design, ACM20 power meters cannot be correct a zero Watts reading, simply reverse the direction of the load calibrated in the field. ACM20 power meters are factory-calibrated to wire passing through the hole in L1. meet their specified accuracies with the supplied L1 current trans- 7. Connector Torque Ratings: It is important to tighten TB1’s, screw- former. Use of any other current transformer will produce significant terminals to their rated torque specification of 3.6 pound-inches errors for the Amps, Watts, and Power Factor measurements. (0.4Nm). Proper tightening will minimize connector losses and ensure Contact Murata Power Solutions if additional information is required safe, reliable operation. regarding calibration, setup, or any other technical issue pertaining to 8. Isolation: Except for the 2-56 thread metallic mounting studs, all of ACM20 power meters. the ACM20 power meter’s internal components (printed circuit board, 4. Wiring: All power supply wiring must be rated for the voltages and resistor, capacitors, current transformer L1’s secondary leads, etc.) currents they will carry and must comply with any code or application- are at the ac-mains potential connected to TB1. ACM20 power meters mandated requirements pertaining to the user’s specific installation. are designed to measure and be powered from one ac power-source only. Any other connection schemes will introduce significant mea- 5. Supply Fusing, and Grounding: Wires specified in the Functional surement errors. Specifications section must be used for making connections to ACM20 series power meters. No connection is required for earth/ chassis ground. TYPICAL WIRING DIAGRAMS 120 V LOAD Epoxy encapsulation B TB1 Note: If the ACM20 displays zero Watts with power applied to the load, reverse the direction Fuse* A of the wire passing through the CT's center hole. See Technical Note 6 for more information. Polarity dot on bottom H N 120 Vac (50/60 Hz) Figure 1. Wiring diagram for 110/120V single phase systems *See technical note 5. www.murata-ps.com/support MPM_ACM20 Series.D02 Page 3 of 7

ACM20 Series Four-Function AC Power Meters TYPICAL WIRING DIAGRAMS, CONT. 220V LOAD Epoxy encapsulation Note: If the ACM20 displays zero Watts with B TB1 power applied to the load, reverse the direction Fuse* A of the wire passing through the CT's center hole. See Technical Note 6 for more information. Polarity dot on bottom L1 L2 220Vac (50/60Hz) Figure 2. Wiring diagram for 220/240V systems with no neutral *See technical note 5. 120V LOAD Epoxy encapsulation Note: If the ACM20 displays zero Watts with B TB1 power applied to the load, reverse the direction Fuse* A of the wire passing through the CT's center hole. See Technical Note 6 for more information. Polarity dot on bottom L1 Neutral L2 220Vac (50/60Hz) Figure 3. Wiring diagram for 120/240V systems with neutral (monitoring L1) *See technical note 5. 120V LOAD Epoxy encapsulation Note: If the ACM20 displays zero Watts with B TB1 power applied to the load, reverse the direction Fuse* A of the wire passing through the CT's center hole. See Technical Note 6 for more information. Polarity dot on bottom L1 Neutral L2 220Vac (50/60Hz) *See technical note 5. Figure 4. Wiring diagram for 120/240V systems with neutral (monitoring L2) www.murata-ps.com/support MPM_ACM20 Series.D02 Page 4 of 7

ACM20 Series Four-Function AC Power Meters PANEL INSTALLATION Using Figure 5 as a guide, carefully insert the ACM20 assembly into the panel opening. From the rear of the panel, install and then tighten All connections to ACM20 power meters must be made after the unit the four #2-56 hex nuts over the threaded studs. Tighten each nut to is securely attached to the panel and with all associated load and 15 to 20 ozf-in (0.106 to 0.140 N-m). Use only the factory-supplied supply voltages de energized (off), using extreme caution and observ- hardware as the use of substitute hardware could result in an unsafe ing all safety measures applicable to the user’s installation. installation and/or adversely affect the reliability of the installation. Care should be exercised when passing conductors through the The recommended range of panel thickness that can be used with the power meter’s built-in current transformer L1. The installed wire- supplied hardware is 0.040 inches (1.0mm) to 0.25 inches (6.4mm). positions should be such that minimal mechanical forces are applied Panel thicknesses outside of this range may require additional user- to current transformer L1, TB1, or to the ACM20 power meter itself. supplied hardware or modifications. Front panel space permitting, In high-vibration environments, it is strongly recommended that ACM20 power meters will fit most existing ACA-20RM / ACA-20PC adequate strain reliefs be used for all wiring. ammeter cutouts, allowing for easy upgrading of existing installations. PANEL PANEL CUTOUT RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS 2-56 Hex Nuts (4 places) ACM20 Tighten each nut to INTERNAL CORNER RADII: 15 to 20 ozf-in (0.106 to 0.140 N-m). 0.032 (0.81) MAX. ut o ut C nel L1 Pa 1.07 0.838* - 0.870 (27.18) (21.29* - 22.10) 1.336* - 1.426 (33.93* - 36.22) 1.626 (41.30) SIDE VIEW 0.093 (2.362) DIAMETER (4 REQUIRED) Figure 5. Panel Installation * The two dimensions marked with an * specify the minimum recommended panel cutout opening for ACM20 power meters. Space permitting, the larger dimensions noted (0.87in., and 1.426in.) should be used. The panel opening must be centered vertically and horizontally between the four 0.093 (2.362mm) diameter holes. 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 specified by Murata Power Solutions, the protection provided by the equipment may be impaired. www.murata-ps.com/support MPM_ACM20 Series.D02 Page 5 of 7

ACM20 Series Four-Function AC Power Meters MECHANICAL SPECIFICATIONS 2.10 (53.3) 0.51 (12.95) 0.12 (3.05) (min) 1.43 (36.3) 1.07 Side View (27.20) VOLTS AMPS WATTS PF SEL AC POWER METER 0.12 (3.05) (min) 0.40 Front View (10.16) CT Lead Length: Standard: 2.0” (50.5mm) min. 32A blue LED model: 20.0” (500mm) min. 100A blue LED model: 28.0” (710mm) min. 0.60 0.086 DIA (REF) B TB1 (15.24) 2-56 UNC THREAD L1 A (max) 0.22 (5.59) 0.33 (8.39) (min) 1.63 (min) (41.4) Diameter: Bottom View 10A and 32A models: 0.35 (8.9) Back View 100A models: 0.57 (14.5) OSCILLOGRAMS The graphs below show typical ACM20 power meter VOLTS readings when the unit is powered from four common ac-voltage waveforms. www.murata-ps.com/support MPM_ACM20 Series.D02 Page 6 of 7

ACM20 Series Four-Function AC Power Meters ORDERING INFORMATION ACM20-2-AC1-R-C 10A, 85-264Vac Supply (Power Factor Reading) ACM20-5-AC1-R-C 32A, 85-264Vac Supply (Power Factor Reading) ACM20-4-AC1-R-C 100A, 85-264Vac Supply (Power Factor Reading) ACM20-2-AC1-R-F-C 10A, 85-264Vac Supply (Frequency Reading) ACM20-5-AC1-R-F-C 32A, 85-264Vac Supply (Frequency Reading) ACM20-4-AC1-R-F-C 100A, 85-264Vac Supply (Frequency Reading) ACM20-5-AC1-B-20-C 32A, 85-264Vac Supply (Power Factor Reading), 20 inch lead length ACM20-4-AC1-B-28-C 100A, 85-264Vac Supply (Power Factor Reading), 28 inch lead length ACM20-4-AC1-B-C 100A, 85-264Vac Supply (Power Factor Reading) ACM20-5-AC1-G-F-C 32A, 85-264Vac Supply (Frequency Reading) This product is subject to the following operating requirements Murata Power Solutions, Inc. and the Life and Safety Critical Application Sales Policy: ISO 9001 and 14001 REGISTERED Refer to: http://www.murata-ps.com/requirements/ 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. Specifications are subject to change without notice. © 2018 Murata Power Solutions, Inc. www.murata-ps.com/support MPM_ACM20 Series.D02 Page 7 of 7

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: M urata: ACM20-4-AC1-R-C ACM20-2-AC1-R-C ACM20-2-AC1-R-F-C ACM20-4-AC1-B-C ACM20-4-AC1-G-F-C ACM20-5- AC1-G-C ACM20-5-AC1-B-C ACM20-2-AC1-B-C ACM20-2-AC1-G-C ACM20-4-AC1-B-F-C ACM20-4-AC1-G-C ACM20-5-AC1-B-F-C ACM20-2-AC1-B-F-C ACM20-2-AC1-G-F-C