ACM20-4-AC1-R-C

ACM20 MURATA | Alldatasheet

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Technical content

Ḥ 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 factor. A front panel selector-switch provides two modes of operation: a fi xed reading of any of the four parameters, or a continuous cycling through all four measurements. An optional model displays line frequency with 0.1Hz resolution. All ACM20 multi-function power meters include built-in current transformers—no other user-supplied components are required. ACM20 series AC power meters are available in a choice of three input ranges: 0-10A (with 0-100A (0.1A resolution, 26.4kW max.). An 85-264Vac (47-63Hz) operating supply range makes these power meters perfect for worldwide power monitoring applications. And, unlike conventional, average-responding products, ACM20 power meters can accurately display the real power and true-rms current values of triangle waves, square waves, and other irregularly shaped waveforms, with a typical accuracy of ±1% of full scale. Their large (0.36"/9.2mm), bright red LED display makes ACM20 AC power meters 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’ and ‘1U’ rack spaces. Their miniature size is perfect for UPS power sources, power strips, laboratory instrumenta- tion, alternative energy applications, and any other products that require precise monitoring of AC power. PRODUCT OVERVIEW

FEATURES

/g132/g3Displays AC Volts, Amps, Watts, and Power Factor or Hertz /g132/g3Two display modes: continuous auto cycling or fi xed /g132/g3Universal 85-264Vac (47-63Hz) operating range (Measurement Category II) /g132/g3Built-in current transformers simplify installation; choice of 10A, 32A, or 100A ranges /g132/g3Ideal for power distribution units (PDUs) and power strips /g132/g3True-rms readings of complex voltage and current waveforms /g132/g3Low-power consumption: less than ¼watt from 120Vac /g132/g3One-piece polycarbonate housing fi ts ‘0U’ & ‘1U’ racks /g132/g3Surface mount design occupies minimal panel space /g132/g3Bright red LED-display with four annunciators /g132/g3Optional Frequency reading models (0.1Hz resolution) /g132/g3Approvals to UL/CSA/IEC/EN 61010-1 SIMPLIFIED SCHEMATIC DIAGRAM A B 85-264 Vac 47-63 Hz AC/DC CONVERTER MICRO- CONTROLLER SEL +5V +5V +5V A/D CONVERTER LOAD CURRENT VOLTS AMPS WATTS PF Actual size C ® US E156931 New! Low-Wattage Models Available ACM20 Series Four-Function AC Power Meters For full details go to www.murata-ps.com/rohs www.murata-ps.com/dpm www.murata-ps.com email: sales@murata-ps.com 03 Mar 2011 MPM_ACM20 Series.A09 Page 1 of 6

Measurement Limits Min. Typ. Max. Units AC Voltage 85.0 - 264.0 Volts AC Current, 10A models ➀ AC Current, 32A models ➀ AC Current, 100A models ➀ 0.00 0.00 0.0 9.999 32.00 100.0 Amperes Amperes Amperes Active Power: 10A models Active Power: 32A models Active Power: 100A models 999.9 9999 26.4 Watts Watts kW Frequency 47.0 - 63.0 Hz Power Factor .00 1.00 - - Overcurrent Rating ➁ 1.5 x rated full-scale current Performance Sampling Rate 2-3 samples / sec Voltage Accuracy ➂ ±1% Current Accuracy ➂ ±1% Power Accuracy ➂ ±2% Frequency Accuracy ➂ ±0.1 Hz Power Factor Accuracy ±3% Measurement Bandwidth 140Hz (Voltage), 14kHz (Current) Temperature Drift (0 to 60ºC) 0.5 Counts/ºC Zero-Current Reading (within 2 sec.) 0.00 Amps Zero-Power Reading (within 2 sec.) 0 Watts Supply Voltage (TB1) (Measurement Category II) All Models – 47-63 Hz 85 120 264 Vac Supply Current ➃ All Models 35 50 110 mA Power Supply Terminal Block 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 ‘9999’ Watts ➄ Decimal Point Selection Automatically Set Physical/Environmental Operating Temperature 0 – +60 °C Storage Temperature –40 – +75 °C Humidity (non-condensing) 0 – 85 % Dimensions See mechanical specifi cations Weight: 32A models Weight: 100A models 1.3oz (37.9g) 1.5oz (43.5g) Hex Nut Tightening Torque 0.14 N-m (20 ozf-in) ➀ Specifi ed full-scale currents are those passing through the power meter’s built-in current transformer’s primary load-circuit. 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. ➂ ACM20 Power Meters are calibrated with near full-scale 60Hz sine-wave inputs. ➃ All specifi ed maximum supply currents are steady state; larger surge currents can occur at initial application of line power. ➄ Applies to 10A and 32A models only. Performance/Functional Specifi cations Typical at TA=+ 25ºC, 120Vac @ 60Hz, unless otherwise noted

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) TECHNICAL NOTES IMPORTANT! To ensure safe and reliable operation, ACM20 power meters must be installed and serviced by qualifi ed technical person- nel. Contact Murata Power Solutions if there is any doubt regarding their installation or operation. 1. Measurement Type: ACM20 series multifunction AC power meters employ a precision energy metering integrated circuit and a low- power microcontroller to measure and display the rms voltage and current, active (real) power, power factor (or line frequency on ‘–F’ suffi x models) of ac mains supplies from 47-63Hz. Please note, ACM20 power meters use the voltage present at their TB1 terminal block and the secondary current of their built-in current transformer L1 to calculate and then display VOLTS, AMPS, WATTS, power factor (PF), or line frequency on ‘-F’ HERTZ models. While the ACM20 displays the rms value of line voltage and line current, the VOLTS reading has an upper limit of 140Hz (-3db point), which means rectangular-shaped voltage waveforms, and waveforms with sharp transitions, will read lower than their true-rms value. For example, a square wave line voltage will read approximately 1-2% lower, a triangle wave will read 3% lower, and a modifi ed sine wave will read 18% lower. The oscillograms on page seven illustrate typical ACM20 VOLTS readings when powered from four ac waveforms. The 140Hz bandwidth limit does not apply to the WATTS reading nor to the AMPS reading. The circuitry used for these two measurements has an upper bandwidth of 14kHz. ACM20 power meters are mains operated devices designed to measure ac currents and voltages, within the specifi ed limits previously noted. DC currents and voltages 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 ac volts with the VOLTS LED annunciator illuminated. The display will remain in the VOLTS mode as long as the front panel ‘SEL’ button is not touched. After the unit powers up to normal operation in the VOLTS reading mode, momentarily (approximately one second) touching the ‘SEL’ button on the unit’s front panel three times in succession will cycle the display to AMPS, WATTS, and end at PF (or HERTZ for ‘–F’ mod- els). Momentarily touching ‘SEL’ a fourth time will return the display back to the VOLTS reading mode. Holding the ‘SEL’ button down for 3 seconds will place the unit in a continuous auto-cycling mode, and the display will repetitively scroll through all four measurements, with each measurement remaining displayed for 3 seconds. ACM20 Series Four-Function AC Power Meters www.murata-ps.com/dpm email: sales@murata-ps.com 03 Mar 2011 MPM_ACM20 Series.A09 Page 2 of 6

display ‘Auto OFF’ before it returns to the fi xed VOLTS reading mode.

1. Calibration: Due their digital design, ACM20 power meters cannot be

errors for the Amps, Watts, and Power Factor measurements.

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

delay/time lag fuse, in accordance with applicable regulatory codes.

120 Vac (50/60 Hz)

Figure 1. Wiring diagram for 110/120V single phase systems is not pinched by the screw terminal.

1. Current Transformer Polarity: In order to perform accurate Watts

the line voltage connected to TB1-A and TB1-B. wire passing through the hole in L1.

1. Connector Torque Ratings: I t is important to tighten TB1’s, screw-
2. Isolation: Except for the 2-56 thread metallic mounting studs, all of

of the wire passing through the CT's center hole. See Technical Note 6 for more information.

TYPICAL WIRING DIAGRAMS, CONT.

220 Vac (50/60 Hz)

Figure 2. Wiring diagram for 220/240V systems with no neutral Figure 3. Wiring diagram for 220/240V systems with neutral (monitoring L1) Figure 4. Wiring diagram for 220/240V systems with neutral (monitoring L2) of the wire passing through the CT's center hole. See Technical Note 6 for more information. of the wire passing through the CT's center hole. See Technical Note 6 for more information. of the wire passing through the CT's center hole. See Technical Note 6 for more information.

ing all safety measures applicable to the user’s installation. to current transformer L1, TB1, or to the ACM20 power meter itself. adequate strain reliefs be used for all wiring. installation and/or adversely affect the reliability of the installation. ammeter cutouts, allowing for easy upgrading of existing installations. Figure 5. Panel Installation Tighten each nut to 15 to 20 ozf-in (0.106 to 0.140 N-m).

The graphs below show typical ACM20 power meter VOLTS readings when the unit is powered from four common ac-voltage waveforms. VOLTS AC POWER METER AMPS WATTS SEL PF 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 Dimensions are in inches (mm). Components are shown for reference only. Tolerances (unless otherwise specified): .XX ± 0.02 (0.51) Angles ± 2˚ B A TB1 Lead Length 2.0 (50.5) min. Diameter: 10A and 32A models: 0.35 (8.9) 100A models: 0.57 (14.5) aamemeter: ACM20 Series Four-Function AC Power Meters 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. © 2011 Murata Power Solutions, Inc. www.murata-ps.com/locations email: sales@murata-ps.com Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED 03 Mar 2011 MPM_ACM20 Series.A09 Page 6 of 6