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ACA-20RM-0-AC3-RL-C Datasheet(PDF) 3 Page - Murata Power Solutions Inc. |
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ACA-20RM-0-AC3-RL-C Datasheet(HTML) 3 Page - Murata Power Solutions Inc. |
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3 / 5 page  MPM_ACA-20RM_B02 Page 3 of 5 ACA-20RM Series True-RMS-AC Ammeters with Built-in CT Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com WIRING DIAGRAMS 4. AC Supply Polarity and Grounding: The two supply inputs, TB1 ‘A’ and ‘B’, on ACA-20RM ammeters are not polarity sensitive, that is, they have no ‘AC LO’ or ‘AC HI’ designations. Also, ac-powered ACA-20RM ammeters do not include or require a connection to earth/ chassis ground. 5. Connector Torque Ratings: Be sure to tighten TB1’s screw-terminals to 3.6 pound-inches (0.4Nm). Proper tightening will ensure reliable long-term operation. 6. Isolation: The on-board CT (L1) provides a minimum of 2000Vdc iso- lation between the current-carrying load conductor passing through its opening and the ammeter’s power source that’s connected to TB1. Of course, this isolation rating applies only to applications where the load wire does not connect directly or indirectly to TB1-A or TB1-B (i.e., where two different ac supplies are involved). 7. Split-Core CT (Clamp-on) Models: 50A models feature a split-core current transformer that can be clamped around a current-carrying load conductor without having to disconnect or remove power from the load’s power source. This live-connection capability can only be used if the load’s power source is isolated (see technical note 6) from the ammeter’s own power source that’s connected to TB1. The ammeter’s ac power supply must always be denergized before making connections to TB1. Refer to the ‘Panel Installation’ section of this data sheet for additional information. First pass and carefully dress one external load wire through L1, then connect the AC supply and load wires to TB1 as shown. Ensure all wires are stripped and properly tightened. For accurate operation, make only Figure 2. Connections for pc-board mounted CT's FROM AC SUPPLY TB1 L1 TO AC LOAD BACK VIEW A B FUSED AC POWER Figure 3. Connection for flying lead CT's The calibration potentiometer has approximately ¾ of a turn of rotation; do not force its adjustment screw past the end stops. Contact MPS if additional information is required regarding calibration, setup, or any other technical issue pertaining to ACA-20RM ac ammeters. 3. Wire Gauges and Fusing: Use only the wires specified under the Functional Specifications Section when making connections to ACA- 20RM Series ammeters. All power supply and load wiring must be adequately rated for the supply voltages and currents they will carry, and they must comply with all code- or application-mandated require- ments pertaining to the user’s installation. The supply wires connected to ACA-20RM ammeters must be fused in accordance with applicable regulatory codes. Also, wire insula- tion should be stripped to within +/-10% of the stated dimensions; wires should be inserted into TB1 such that the screw terminal does not pinch their insulation. TB1 can only used for supplying power to the meter’s internal circuitry; it must not be used to supply current to external loads. AC-powered models draw minimal steady-state supply currents (less than 0.050A) and they can be fused according to the supply wire’s maximum amperage rating. However, these models can draw higher surge currents for brief periods (in the microsecond range) when power is initially applied. one pass with load wire through the on-board CT (only one primary turn). For split-core CT models, make sure to fully engage the CT's Locking mechanism BACK VIEW TO AC LOAD A B FUSED AC POWER FROM AC SUPPLY TB1 L1 |
Similar Part No. - ACA-20RM-0-AC3-RL-C |
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Similar Description - ACA-20RM-0-AC3-RL-C |
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