ACM3P Series www.murata-ps.com Three-Phase AC Ammeters Actual size C US E156931 FEATURES PRODUCT OVERVIEW Measure and display the true-rms current of 3-phase Murata Power Solutions ACM3P series 3-phase AC ammeters measure and display the power systems 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- Universal 85-264Vac (47-63Hz) operating supply range tionally complete, with built-in L1, L2, and L3 current transformersno other user-supplied components or hardware are required. Three built-in current transformers measure up to 100A per phase ACM3P series AC ammeters are available with a 0-100A input range (150A peaks) and Ideal for power distribution units (PDUs) and backup provide a resolution of 0.1 Amp. Their 85-264Vac (47-63Hz) operating supply range makes power systems these ammeters perfect for worldwide 3-phase current monitoring applications. And, unlike conventional average-responding products, ACM3P ammeters can accurately display the Low power consumption: less than watt from 120Vac supply true-rms values of triangle waves, square waves, and other irregularly shaped AC current waveforms, with an accuracy of 2% of full scale. One-piece polycarbonate housing fits 0U & 1U rack spaces Their large (0.36 /9.2mm), bright LED display, available in a choice of red, blue, or green, Low-profile surface mount design occupies minimal enables ACM3P ammeters to be easily readable from as far as 15 feet (5 meters). All behind-the-panel space 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 Available in red, green, or blue LED-displays with backup power sources, power strips, alternative energy metering, and any other applica- phase annunciators tions that require precise monitoring of 2- or 3-phase ac current. Low Cost approvals to UL/cUL/IEC/61010-1 SIMPLIFIED SCHEMATIC DIAGRAM L1 L2 L3 PHASE 1 +5V L1 PHASE 2 L2 A/D PHASE 3 CONVERTER L3 +5V CURRENT B +5V LIMITED 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 ACM3P Series.C01 Page 1 of 6ACM3P Series Three-Phase AC Ammeters Performance/Functional Specifications Typical at TA=+ 25C, 120Vac 50Hz, unless otherwise noted Measurement Limits Min. Typ. Max. Units TECHNICAL NOTES AC (rms) Current, L1, L2, L3 0.0 100.0 Amperes IMPORTANT To ensure safe and reliable operation, ACM3P amme- 1.5 x Rated full-scale current Overcurrent Rating ters must be installed and serviced by qualified technical personnel. Performance Contact Murata Power Solutions if there is any doubt regarding their installation or operation. Sampling Rate 1.5 samples/sec 1. Measurement Type: ACM3P series 3-phase ammeters employ a Current Accuracy 2% 3% precision energy metering integrated circuit and a low-power micro- Measurement Bandwidth (L1, L2, L3) 14kHz controller to measure and display the rms value of 2- or 3-phase Temperature Drift (0 to 60C) 0.5 Counts/C ac-mains current. However, while the unit has an upper bandwidth Zero-Current Reading (within 1 sec.) 1 Counts of 14kHz, dc components or frequencies below 47Hz will not be UL/IEC61010-1 Measurement category II measured accurately. Supply Voltage (TB1) 2. Basic Operation: Upon application of ac power to TB1, the unit will All Models 85 120 264 Vac/47-63Hz first perform a self-test routine and then continuously display am - peres, with one of the three phase-annunciator LEDs illuminated (L1, Supply Current L2, or L3). The display will remain fixed in one of these reading modes ACM3P-X-AC1-R-X-C 35 50 110 mA as long as the front panel SEL button is not touched. Assuming phase ACM3P-X-AC1-G-X-C 50 75 165 mA L1 is initially illuminated, momentarily touching the SEL button two ACM3P-X-AC1-B-X-C 50 75 165 mA times in succession will cycle the display to phase L2, and then to Power Supply Terminal Block (TB1) phase L3. Momentarily touching SEL a third time will return the unit Wire Size 16-22AWG, solid or stranded back to displaying phase L1 current. Insulation Strip Length 6.4mm (0.250 in) If power is removed and then restored, the ACM3P will perform a Screw Tightening Torque 0.4Nm (3.6 lb-in) self-test and then return to displaying the last selected phase, i.e., the phase it displayed just before power was removed. Rated Voltage 300Vac Configuring for 2-Phase Operation: As shipped, ACM3P ammeters Display are configured to measure and display 3-phase currents (L1, L2, and Display Type and Size 4 Digit LED, 9.14mm (0.36in) high L3 current transformers are all active). The unit can be set to display Overrange Indication Flashing display 2-phase currents (only L1 and L2 are active) by performing the follow- Decimal Point Selection Automatically Set ing procedure: Physical/Environmental A. Press and hold the SEL button for approximately five seconds and Operating Temperature: 0 +60 C then release the button once the words LinE SEt appear on the Storage Temperature: -40 +75 C display. Humidity (non-condensing): 0 85 % B. Briefly tapping the SEL button will alternate the display reading Dimensions: See mechanical specifications between 2-Ph and 3-Ph each time SEL is tapped. Weight, all models 2.6 oz (74g) C. To change the factory default 3-phase mode to 2-phase, leave the display fixed in the 2-Ph reading for at least five seconds. Notes Specified full-scale currents are those passing through the power meters built-in current To revert the unit back to 3-phase operation simply repeat the above transformers primary load-circuit. See Notes 2 and 3 below for additional information. procedure but, in step C, allow the unit to display a fixed 3-Ph for at 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 least five seconds. rated current level. Power Meters are calibrated with near full-scale 50Hz sine-wave inputs. ACM3P ammeters with manufacturing date codes of June 2016 or All specified maximum supply currents are steady state. Larger surge currents can occur at later have the additional ability to continuously scroll (auto-scroll) initial application of line power. through all 3 phases, or auto-scroll through only 2 phases. The process for configuring the ACM3P for auto-scrolling operation begins by first holding down the SEL switch for five seconds to enter ORDERING INFORMATION the programming mode that is indicated by the display showing LinE SEt. ACM3P-4-AC1-R-C 100A, 85-264Vac Supply, Red LED Display After the unit displays LinE SEt, immediately and repeatedly ACM3P-4-AC1-G-C 100A, 85-264Vac Supply, Green LED Display pressing and releasing the SEL switch will cycle the unit through the ACM3P-4-AC1-B-C 100A, 85-264Vac Supply, Blue LED Display following four operating-mode options: ACM3P-4-AC1-B-28-C 100A, 85-264Vac Supply, Blue LED Display, 28 inch lead length continued on next page www.murata-ps.com/support MPM ACM3P Series.C01 Page 2 of 6