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PM2002DP Datasheet(PDF) 3 Page - Sames |
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PM2002DP Datasheet(HTML) 3 Page - Sames |
3 / 10 page sames sames PM2002DP 3/10 http://www.sames.co.za ANALOG SECTION The analog (metering) interface described in this section is designed for measuring 220V/80A with precision better than Class 1. The most important external components for the SA2002D integrated circuit are the current sense resistors, the voltage sense resistors and the bias setting resistor. The resistors used in the metering section should be of the same type so temperature effects are minimized. Voltage Input IVP The voltage input of the SA2002D (IVP) is driven with a current of 14µA at nominal mains voltage. This voltage input saturates at approximately 17µA. At a nominal voltage current of 14µA allows for 20% overdriving. The mains voltage is divided with a voltage divider to 14V that is fed to the voltage input pins via a 1MW resistor Voltage Divider The voltage divider is (Figure 3) calculated for a voltage drop of 14V. Treat C7 as a short circuit and ignore J16. Equations for the voltage divider in figure 3 are: RB = R1 + R2 + R3 + R15 + R10 RB = R12 || ( R11 + P1 / 2) Combining the two equations gives: (RA + RB) / 220V = RB / 14V Values for resistors R10 = 47W, R11 = 22kW, P1=10kW and R12 = 1MW is chosen. Substituting the values result in: RB = 26.29kW RA = RB x (220V / 14V - 1) RA = 386.84kW Figure 3: Mains voltage divider R1 R2 R3 R10 R11 R12 NEUTRAL C7 R15 J16 P1 LIVE IN Standard resistor values of R1, R2, R3 and R15 are chosen to be 47kW, 150kW, 47kW and 150kW. The resistor RA is divided so that the voltage drop across one resistor is within the specified limits of the resistor type that is used, usually 200VDC. The resistor value ratios are chosen so that shorting J16 the module could be used on a 110VAC mains system. CURRENT SENSOR INPUT RESISTORS FIGURE 4 (USING A SHUNT RESISTOR) The resistors R6, R7 define the current level into the current sense inputs the device. The voltage drop across the shunt should be at least 20mV at rated conditions. A shunt resistor with a value of 50mV @80A was chosen for the application module for its ease of use. The resistor values are calculated for an input current of 16µA on the current inputs at rated conditions. For a 80A meter the resistor values are calculated as follows: R6 = R7 = (I / 16µA) x R / 2 L SH = 80A / 16µA x 625uW / 2 = 1.5625kW I Line current L = A standard value of 1.6kW is chosen. Figure 4: Current input configuration R6 R7 R14 LIVE IN LIVE OUT L |
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