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ACA5-20PC-9-AC1-RL-C Datasheet(PDF) 3 Page - Murata Power Solutions Inc. |
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ACA5-20PC-9-AC1-RL-C Datasheet(HTML) 3 Page - Murata Power Solutions Inc. |
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3 / 5 page  The supply wires connected to both the meter and the load must be fused according to the current rating of the wire gauge being used, in accordance with applicable regulatory codes. Also, wire insulation should be stripped to within +/–10% of the stated dimensions, and wires should be inserted into TB1 such that their insulation is not pinched by the screw terminal. TB1 is to be used only for powering 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 (50mA max.), and in most applications, they can be fused accord- ing to the supply wire’s maximum amperage rating. However, these models can draw significantly higher surge currents for brief periods when the ac line voltage is initially applied. 4. AC Supply Polarity and Grounding: The two supply inputs, TB1-A and TB1-B, on all ac-powered ACA5-20PC ammeters are not in themselves polarity sensitive, that is, they have no internal "AC LO" or "AC HI" designations. Also, ac-powered ACA5-20PC ammeters do not include or require a connection to earth/chassis ground. 5. 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. 6. DC-Powered Models: DC-powered models draw minimal supply cur- rents (120mA max.) and in most applications can be fused according to the supply wire’s maximum amperage rating. However, be sure to check and comply with all applicable codes and regulations to ensure proper installation and operation. 7. Isolation: The on-board CT (L1) provides a minimum 2000Vdc isolation between the current-carrying conductor passing through its primary circuit and the ammeter supply voltage connected to TB1. This isolation rating only applies to applications in which the load wiring (i.e., the wire passing through L1’s center hole) does not con- nect directly or indirectly to TB1-A or TB1-B. 8. CT Precautions: In normal operation, a 5A current transformer’s secondary circuit operates at a very low voltage due to its closed- loop operation and its low burden resistance. However, a CT can still generate potentially lethal voltages if its output current is suddenly interrupted. For example, loose CT secondary connections can cause a condition referred to as “inductive kick". Inductive kick can generate extremely high voltages across intermitent secondary connections. Therefore, implementing connections to any 5A current transform- er’s output leads must only be performed with zero load-current, that is, with no power applied to the load circuit. 9. CT Connections and Grounding: Some applications require connecting one of the external 5A CT’s output leads to earth/chas- sis ground. In the USA, consult the latest revision of the National Electrical Code (NEC) for more information regarding CT grounding. After all mechanical assembly is completed, connect the two output leads of the external 5A CT to each other after they are run through L1’s center hole. Pressure-style connectors (commonly refered to as “wire nuts”) are acceptable as long as they are rated for the number of conductors and voltage invloved. 10. Replacing Analog Panel Meters: ACA5-20PC ammeters can be used as direct replacements for analog panel meters driven by 5A CT’s. All wiring operations must be performed with both the load and the supply power sources completely de-energized. Figure 2. Panel Installation All connections to ACA5-20PC Series ammeters must be made after the ammeter is securely attached to the panel and with all load and supply voltages de-energized (off). Care should be exercised when passing conductors through the ammeter’s built-in CT. The installed wire positions should be such that minimal forces are applied to the built-in CT, TB1, or to the ammeter itself. In high-vibration environments, proper strain reliefs must be used for all load and supply wiring. To ensure a secure panel-mount installation, MPS recommends using the DMS-BZL4-C bezel assembly (with sealing gasket) supplied with each ammeter. See Mechanical Specifications for detailed cutout and ammeter dimensions. Following the four-step sequence shown in Figure 2 — being careful not to apply excessive force or twisting motions — insert the ammeter into the panel opening. When using the DMS-BZL4-C, install its sealing gas- ket so it is positioned between the ammeter’s front flange and panel front surface (see Mechanical Specifications). Be sure to use and securely tighten all four screws supplied with the bezel assembly. Step 2. Step 3. Step 4. Step 1. � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � MPM_ACA520PC_B02 Page 3 of 5 ACA5-20PC Series 5 Amp Input LED-Display AC Ammeters Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com PANEL INSTALLATION |
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