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 transformersno 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 1% 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 l3 phase 1 l1 phase 2 l2 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 ?watt from 120vac supply ? ? one-piece polycarbonate housing ? ts 0u & 1u rack spaces ? ? low-pro? le surface mount design occupies minimal behind-the-panel space ? ? available in red, green, or blue led-displays with phase annunciators ? ? low cost; ul/csa approvals pending for full details go to www.murata-ps.com/rohs www.murata-ps.com www.murata-ps.com/support acm3p series three-phase ac ammeters mpm_acm3p series.a01 page 1 of 6 s www.datasheet.co.kr datasheet pdf - http://www..net/
performance/functional speci? cations typical at ta=+ 25oc, 120vac @ 60hz, 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-r-b-c* 100a, 85-264vac supply, blue led display *consult factory for availability technical notes important! to ensure safe and reliable operation, acm3p amme- ters must be installed and serviced by quali? 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 ? 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 ? 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. con? guring for 2-phase operation: as shipped, acm3p ammeters are con? 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 ? ve seconds and then release the button once the words line set appear on the display. b. brie? 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 ? xed in the 2-ph reading for at least ? 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 ? xed 3-ph for at least ? 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 ? 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 ? eld. acm3p ammeters are factory-calibrated to meet their speci? ed accuracies with the factory supplied current transformers. use of any other current transformers will produce signi? 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 ? 0.0 100.0 amperes overcurrent rating ? 1.5 x rated full-scale current performance sampling rate 2-3 samples/sec current accuracy ? 1% measurement bandwidth (l1, l2, l3) 14khz temperature drift (0 to 60oc) 0.5 counts/oc zero-current reading (within 1 sec.) 1 counts supply voltage (tb1) all models 85 120 264 vac/47-63hz supply current ? 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 speci? cations weight, all models 2.6 oz (74g) notes ? speci? ed full-scale currents are those passing through the power meters built-in current transformers primary load-circuit. see notes 2 and 3 below for additional 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. accuracy is guaranteed up to the rated current level. ? power meters are calibrated with near full-scale 50hz sine-wave inputs. ? all speci? 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.a01 page 2 of 6 www.datasheet.co.kr datasheet pdf - http://www..net/
technical notes, continued 5. wiring: all power supply and load wiring must be rated for the volt- ages and currents they will carry and must comply with any code or application-mandated requirements pertaining to the users speci? c installation. 6. supply fusing, and grounding: wires speci? ed in the functional speci? cations section must be used for making connections to ac- m3p series ammeters tb1 terminal block. no connection is required for earth/chassis ground. acm3p series ammeters are not internally fused. terminal block tb1 is to be used only for powering the ammeter's internal circuitry; it must not be used to supply power to external loads. the supply wires feeding these power meters must be fused with a 0.5a/250v time delay/time lag fuse, in accordance with applicable regulatory codes. wire insulation must be stripped to within 10% of the stated dimen- sions, and wires should be inserted into tb1 such that their insulation is not pinched by the screw terminal. 7. current transformer phasing: since the acm3p only measures amperes, transformer phasing is not required. phasing refers to the direction of the current-carrying wire as it passes through the primary hole of each of the three built-in current transformers. 8. connector torque ratings: it is important to tighten tb1s screw- terminals to their rated torque speci? cation of 3.6 pound-inches (0.4nm). proper tightening will minimize connector losses and ensure safe, reliable operation. 9. isolation: except for the 2-56 thread metallic mounting studs, all of the acm3p ammeters internal components (printed circuit board, resistor, capacitors, current transformers l1, l2 and l3s secondary leads, etc.) are at the ac-mains potential connected to tb1. acm3p ammeters are designed to be powered from one ac power-source only. any other connection schemes could introduce signi? cant mea- surement errors. the three built-in current transformers have a dielectric breakdown rating of 2kv minimum, allowing them to safely monitor 480v, 3-phase ac mains currents. this dielectric rating pertains only to the insulated load-carrying wire as it passes through the built-in cts primary hole. however, attention must still be paid to ensure adequate wire-to-wire spacings, and wire-to-metallic surface spacings. prop- erly rated wiring and fusing must be used for all installations, as noted in technical notes 5 and 6 above. important: even though acm3p ac ammeters can be used in 480v current monitoring applications, the ac supply connected to tb1 must never exceed the maximum rating of 264v/47-63hz. figure 1. panel installation side view 2-56 hex nuts (4 places) tighten each nut to 15 to 20 ozf-in (0.106 to 0.140 n-m). l1 l2 l3 acm3p panel cutout panel panel installation all connections to acm3p ammeters must be made after the unit is securely attached to the panel, and with all associated load and sup- ply voltages de-energized (off), using extreme caution and observing all safety measures applicable to the users installation. care should be exercised when passing conductors through the ammeters built-in current transformers l1, l2, and l3. the installed wire-positions should be such that minimal mechanical forces are applied to the current transformers, tb1, or to the acm3p ammeter itself. in high-vibration environments, it is strongly recommended that strain reliefs be used for all wiring. using figure 1 as a guide, carefully insert the acm3p assembly into the panel opening. from the rear of the panel, install and then tighten the four #2-56 hex nuts over the threaded studs. tighten each nut to 15 to 20 ozf-in (0.106 to 0.140 n-m). use only the factory-supplied hardware as the use of substitute hardware could result in an unsafe installation and/or adversely affect the reliability of the installation. the recommended panel thickness range that can be used with the supplied hardware is 0.040 inches (1.0mm) to 0.25 inches (6.4mm). panel thicknesses outside of this range may require additional user- supplied hardware or modi? cations. www.murata-ps.com/support acm3p series three-phase ac ammeters mpm_acm3p series.a01 page 3 of 6 www.datasheet.co.kr datasheet pdf - http://www..net/
typical wiring diagrams b a tb1 phase a phase b l1 l1 l2 l3 phase c note: line and phase currents are the same for wye systems. l2 l3 85C264 vac 47C63 hz fuse* figure 2. wiring diagram wye systems figure 3. wiring diagram for delta systems monitoring line current b a tb1 85C264 vac 47C63 hz fuse* phase a phase b l1 l1 l2 l3 phase c l2 l3 figure 4. wiring diagram for delta systems monitoring phase current b a tb1 85C264 vac 47C63 hz fuse* phase a phase b l1 l1 l2 l3 phase c l2 l3 *see technical note 6. *see technical note 6. *see technical note 6. www.murata-ps.com/support acm3p series three-phase ac ammeters mpm_acm3p series.a01 page 4 of 6 www.datasheet.co.kr datasheet pdf - http://www..net/
mechanical specifications l1 multi-phase ac ammeter l2 l3 sel 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) 2-56 unc thread 0.33 (8.39) (min) 0.22 (5.59) (min) 0.60 (15.24) (max) bottom view dimensions are in inches (mm). components are shown for reference only. tolerances (unless otherwise speci?ed): .xx 0.02 (0.51) .xxx 0.010 (0.254) angles 2? b a tb1 lead length 5.0 (127) min. l3 l2 l1 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. www.murata-ps.com/support acm3p series three-phase ac ammeters mpm_acm3p series.a01 page 5 of 6 www.datasheet.co.kr datasheet pdf - http://www..net/
notes 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 her ein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. speci? cations are subject to cha nge without notice. ? 2011 murata power solutions, inc. www.murata-ps.com/support murata power solutions, inc. 11 cabot boulevard, mans? eld, ma 02048-1151 u.s.a. iso 9001 and 14001 registered acm3p series three-phase ac ammeters mpm_acm3p series.a01 page 6 of 6 www.datasheet.co.kr datasheet pdf - http://www..net/
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