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RM4301ASEA Datasheet(PDF) 6 Page - Sames |
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RM4301ASEA Datasheet(HTML) 6 Page - Sames |
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6 / 19 page  http://www.sames.co.za 6/19 PRELIMINARY RM4301ASEA POWER SUPPLY The RM4301ASEA meter uses a transformer based supply with a single 7805 regulator to generate a stable 5V supply. This supply is then split into two 2.5V supplies by means of a resistive divider. The center of this divider is connected to the reference level of the meter to create the required +2.5V and -2.5V power supply for the SA4301A. The complete power supply circuit is shown in Figure 4. Due to the use of transformers this supply can still operate the circuit when two phases are missing and the mains voltage drops to below 0.8VNOM. Additionally it conforms to the power requirements of the IEC specification, even when the mains voltage increases to beyond 1.2VNOM. TAMPER INDICATORS The SA4301A has built in tamper indication features that use six LEDs to display the mains voltage failure as well as reverse energy on a per phase basis. The RM4301ASEA contains the standard LED tamper array in order to display these tamper conditions as shown in Figure 5. If a specific mains voltage LED is off this means that that mains voltage has failed. Reverse energy is indicated by a specific direction LED turning on. Should all three mains voltage LEDs flash, a phase sequence error is present. IMMUNITY TO ELECTROMAGNETIC DISTURBANCE The typical electromagnetic disturbances that can cause the meter to fail or incorrectly record energy are: n Electrostatic discharge and surges n Electromagnetic HF (high frequency) fields n Fast transient burst (FTB) Typically these disturbances will either cause complete and permanent failure by damaging the sensitive CMOS circuitry of the SA4301A through high voltage levels or cause incorrect registration of energy through high frequency signals that are aliased into the operating bandwidth of the device, thereby disrupting the energy calculation algorithm. The immunity of a class 1 watt-hour meter to these types of disturbances is prescribed by the IEC62053-21 specification. Generally two protection mechanisms are required. The first is to ensure that dangerously high voltage levels are sufficiently attenuated or clamped so that no permanent damage can occur to the SA4301A and other sensitive 1N4007 VSS -2.5V NEUTRAL D4 1N4007 D5 1N4007 D6 78L05 LIVE IN3 LIVE IN2 LIVE IN1 + C4 470µF D1 D2 D3 C3 10nF C2 10nF C1 10nF S20K420 S20K420 S20K420 C5 100nF + C6 22µF C7 100nF C8 100nF C9 100nF R2 1k W R1 1k W +2.5V VDD T1 T2 T3 1N4007 VSS -2.5V NEUTRAL D4 1N4007 D5 1N4007 D6 78L05 LIVE IN3 LIVE IN2 LIVE IN1 + C4 470µF D1 D2 D3 C3 10nF C2 10nF C1 10nF S20K420 S20K420 S20K420 C5 100nF + C6 22µF C7 100nF C8 100nF C9 100nF R2 1k W R1 1k W +2.5V VDD T1 T2 T3 Figure 4: Circuit diagram of the power supply circuit R6 1k W SA4301A PH/DIR PH3 R5 1k W PH2 R4 1k W PH1 D7 D8 MAINS1 DIR1 D9 D10 MAINS2 DIR2 D11 D12 MAINS3 DIR3 R6 1k W SA4301A PH/DIR PH3 R5 1k W PH2 R4 1k W PH1 D7 D8 MAINS1 DIR1 D9 D10 MAINS2 DIR2 D11 D12 MAINS3 DIR3 Figure 5: Tamper LED array |
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