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ACM20-2-AC1-R-F-C Datasheet(PDF) 3 Page - Murata Manufacturing Co., Ltd. |
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ACM20-2-AC1-R-F-C Datasheet(HTML) 3 Page - Murata Manufacturing Co., Ltd. |
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3 / 6 page  When the continuous auto-cycling mode is initially selected, the unit will briefly display ‘Auto On’ before continuous cycling begins. Mo- mentarily touching the ‘SEL’ button again will cause the unit to briefly display ‘Auto OFF’ before it returns to the fixed VOLTS reading mode. 3. Calibration: Due their digital design, ACM20 power meters cannot be calibrated in the field. ACM20 power meters are factory-calibrated to meet their specified accuracies with the supplied L1 current trans- former. Use of any other current transformer will produce significant errors for the Amps, Watts, and Power Factor measurements. Contact Murata Power Solutions if additional information is required regarding calibration, setup, or any other technical issue pertaining to ACM20 power meters. 4. Wiring: All power supply wiring must be rated for the voltages and currents they will carry and must comply with any code or applica- tion-mandated requirements pertaining to the user’s specific installa- tion. 5. Supply Fusing, and Grounding: Wires specified in the Functional Specifications section must be used for making connections to ACM20 series power meters. No connection is required for earth/ chassis ground. ACM20 series power meters are not internally fused. Terminal block TB1 is to be used only for powering the power meter'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. TYPICAL WIRING DIAGRAMS H N B B A A A TB1 120 Vac (50/60 Hz) 120 V LOAD Epoxy encapsulation Polarity dot on bottom Fuse* Figure 1. Wiring diagram for 110/120V single phase systems 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. 6. Current Transformer Polarity: In order to perform accurate Watts and Power Factor measurements, connections to the two rear power supply inputs, TB1-A and TB1-B, and built-in current transformer L1 must have the proper polarity. That is, the load current flowing in the wire passing through L1's center hole must have the same polarity as the line voltage connected to TB1-A and TB1-B. The wiring diagrams in Figures 1-4 ensure that, for a purely resistive load, current flowing in current transformer L1’s primary circuit will have the same polarity as the applied voltage at TB1. If proper polarity is not followed, the Watts and Power Factor readings will be zero. To correct a zero Watts reading, simply reverse the direction of the load wire passing through the hole in L1. 7. Connector Torque Ratings: It is important to tighten TB1’s, screw- terminals to their rated torque specification of 3.6 pound-inches (0.4Nm). Proper tightening will minimize connector losses and ensure safe, reliable operation. 8. Isolation: Except for the 2-56 thread metallic mounting studs, all of the ACM20 power meter’s internal components (printed circuit board, resistor, capacitors, current transformer L1’s secondary leads, etc.) are at the ac-mains potential connected to TB1. ACM20 power meters are designed to measure and be powered from one ac power-source only. Any other connection schemes will introduce significant mea- surement errors. Note: If the ACM20 displays zero Watts with power applied to the load, reverse the direction of the wire passing through the CT's center hole. See Technical Note 6 for more information. *See technical note 5. 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 3 of 6 |
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