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ACA-20RM-5-AC3-RL-ALM-C Datasheet(PDF) 3 Page - Murata Power Solutions Inc. |
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ACA-20RM-5-AC3-RL-ALM-C Datasheet(HTML) 3 Page - Murata Power Solutions Inc. |
3 / 5 page ACA-20RM-ALM Series True-rms-AC Ammeters with Alarm Function www.murata-ps.com/dpm email: sales@murata-ps.com 10 Nov 2010 MPM_ACA-20RM-ALM.A03 Page 3 of 5 6. 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. 7. Isolation: The built-in current transformer L1 provides a minimum of 2000Vdc isolation between the load conductor and the ammeter’s supply voltage connected to TB1. 8. Split-Core CT (Clamp-on) Models: Both 50A models feature a split- core current transformer that can be clamped around a properly insu- lated live conductor without having to disconnect or remove power from the load circuit. This live-connection capability can only be used if the load’s power source is electrically isolated (see technical note 7) 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. L1 TO AC LOAD TB1 BACK VIEW A B FUSED AC POWER Figure 2. Typical wiring diagram To adjust the overcurrent alarm set-point level: A. Turn off power to the ACA-20RM-ALM (i.e., the power source con- nected to TB1). B. Carefully remove the shorting jumper across JP1 from its ‘normal operation position’ across terminals 2 and 3 and place it across JP1 terminals 1 and 2. C. Re-apply power to TB1 and, using a plastic insulated adjusting tool, adjust R3 so the ammeter’s display shows the desired overcurrent trip level in Amps. D. Turn off power to the ACA-20RM-ALM and return JP1’a shorting jumper back to its ‘normal operation position’ across terminals 2 and 3. Re-apply power to TB1 to resume normal operation. If pos- sible, after the ammeter is re-configured for normal operation, the load current should be slowly increased to verify the visual alarm operates when the load current exceeds the preset level. Please note, the load circuit does not need to be turned off to adjust the overcurrent alarm set point. Current flowing through L1 while JP1 is across terminals 1 and 2 will not be measured. Once tripped, the alarm set point function has a hysteresis of approximately 0.5A. The overcurrent alarm function can also be adjusted with JP1 in its normal operation position if the desired alarm overcurrent-level is actually flowing through L1 (i.e., with a live load). For example, with a 20 Amp load current flowing through L1, and with JP1 in its normal operation position, slowly adjust R3 until the display starts flashing on and off. Using this “live load” adjustment method eliminates the need to turn off power to TB1 or reconfiguring JP1. 4. Wire Gauges and Fusing: Wires specified in the Functional Specifica- tions section must be used for making connections to ACA-20RM-ALM 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. The supply wires connected to both the ammeter 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. All models draw minimal steady-state supply currents (50mA max.), and in most applications, they can be fused according to the supply wire’s maximum amperage rating. However, these products can draw significantly higher surge currents for brief periods when the ac line voltage is initially applied. 5. AC Supply Polarity and Grounding: The two supply inputs, TB1-A and TB1-B, on ACA-20RM-ALM ammeters are not in themselves polarity sensitive, that is, they have no internal “AC LO” or “AC HI” designa- tions. ACA-20RM-ALM ammeters do not include or require a connec- tion to earth/chassis ground. Figure 3. Alarm circuit component location TB1 R7 CAL JP1 BACK VIEW R3 ALARM JP1 Normal Operation 3 2 1 JP1 Overcurrent Alarm Adjustment 3 2 1 3 2 1 |
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