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ACA-20PC-2-DC1-PGL-L-C Datasheet(PDF) 3 Page - Murata Power Solutions Inc. |
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ACA-20PC-2-DC1-PGL-L-C Datasheet(HTML) 3 Page - Murata Power Solutions Inc. |
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3 / 6 page  ACA-20PC Series Digital, LED-Display AC Ammeters with Built-in Current Transformers Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com MPM_ACA_20PC.B05 Page 3 of 6 IMPORTANT! To ensure safe and reliable operation, ACA-20PC ammeters must be installed and serviced by qualified technical personnel. Contact DATEL if there is any doubt regarding ammeter installation and/or operation. 1. Measurement Type: ACA-20PC ac ammeters employ a full-wave- rectified, average responding, rms-calibrated circuit to measure the stepped-down output of their on-board, L1 current transformer (CT) . Stated accuracy specifications are measured using a sine-wave cur- rent at or close to the specified full scale input level, at nominal line frequency. 2. Calibration: Periodic recalibration of ACA-20PC ammeters is not required under normal, indoor operating environments. If user calibration is necessary, it should be performed by qualified technical personnel. Calibration is performed with potentially lethal voltages applied to the ACA-20PC and its associated wiring, with the specified full-scale current flowing through the ammeter’s built-in current transformer. A plastic, fully insulated adjusting tool must be used to access the recessed calibration potentiometer located on the back of the meter (see Mechanical Specifications). Contact DATEL if additional informa- tion is required regarding calibration, setup, or any other technical issue pertaining to the ACA-20PC. 3. Wire Gauges and Fusing: Wires specified in the Functional Specifi- cations section must be used for making connections to ACA-20PC Series ammeters. All power-supply and load wiring must be rated for the supply voltages and currents they will conduct and must comply with any code or application-mandated requirements pertaining to the user’s specific installation. In particular, special attention must be paid to ACA-20PC-1-AC1-RL and ACA-20PC-2-AC1-RL ac-powered models when their built-in auxiliary terminal block connections (TB1) are used to supply current to an external load. 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. The ACA-20PC-3-ACX (0-50A range, ac-powered) and ACA-20PC- 4-ACX (0-100A, ac-powered) models’ TB1 is used only for powering the meters' internal circuitry. It must not be used to supply current to external loads. The supply wires feeding these meters must also be fused according to the current rating of the wire gauge being used, in accordance with applicable regulatory codes. 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 ac supply inputs, TB1-A and TB1-B, on ac-powered ammeters are not in themselves TECHNICAL NOTES polarity sensitive, that is, they have no internal "AC LO" or "AC HI" designations. Also, ac-powered ACA-20PC ammeters do not include or require a connection to earth/chassis ground. However, in many applications, external ac loads which are connected directly to the ACA-20PC’s built-in auxiliary terminal blocks must be wired with proper polarity and connected to earth/chassis ground. 5. Connector Torque Ratings: It is important to tighten TB1's screw terminals to their rated torque specifications of 4.4 pound-inches (0.5Nm) for four-terminal ammeters (ACA-20PC-1-AC1-RL and ACA- 20PC-2-AC1-RL), and 3.6 pound-inches (0.4Nm) for two-terminal ammeters. Proper tightening will minimize connector losses and ensure safe, reliable operation. 6. 100 Amp Model (ACA-20PC-4-XXX): This model’s built-in current transformer requires a larger panel cutout width dimension. See Mechanical Specifications for more information. 7. DC-Powered Models: DC-powered models draw minimal supply currents 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. 8. 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. Of course, this isolation rating only applies to applications in which the load wiring (i.e., the wire passing through the CT’s center hole) does not connect directly or indirectly to TB1-A or TB1-B. All connections to ACA-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 the load-carrying conduc- tor through the meter’s built-in CT—particularly when larger-gauge conductors are used. The position of the installed wire should be such that minimal forces are applied to the built-in CT, TB1, or to the ammeter itself. In high-vibration environments, adequate strain reliefs be used for all load and supply wiring. To ensure a secure panel-mount installation, DATEL recommends using the DMS-BZL4 bezel assembly (with sealing gasket) supplied with each ammeter. Also, please note that the ACA-20PC-4-XXX 100A oversize CT requires a larger panel-cutout width of 1.350" (34.3mm). See Mechanical Specifications for detailed cutout and ammeter dimensions. Following the four-step sequence shown in Figure 2 below—being careful not to apply excessive force or twisting motions—insert the ammeter into the panel opening. When using the DMS-BZL4 bezel assembly, install its sealing gasket 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. PANEL INSTALLATION |
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