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SA2002D Scheda tecnica(PDF) 5 Page - Sames |
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SA2002D Scheda tecnica(HTML) 5 Page - Sames |
5 / 10 page 5/10 sames SA2002D http://www.sames.co.za The current and voltage sense inputs are both identical. Both inputs are differential current driven up to ±25µA peak. One input of the voltage sense amplifier is internally connected to GND. This is possible because the voltage sense input is much less sensitive to externally induced parasitic signals compared to the current sense inputs. ELECTROSTATIC DISCHARGE (ESD) PROTECTION POWER CONSUMPTION VREF Current sense input (IIP and IIN) Voltage Sense Input (IVP) The SA2002D integrated circuit's inputs/outputs are protected against ESD. The power consumption rating of the SA2002D integrated circuit is less than 25mW. A bias resistor of 24k sets optimum bias and reference conditions on chip. Calibration of the SA2002D should be done on the voltage input as described in Typical Applications. Figure 3 on page 4 shows the typical connections for the current sensor input. The resistor R1 and R2 define the current level into the current sense inputs of the SA2002D. At maximum rated current the resistor values should be selected for input currents of 16µA . The values for resistors R1 and R2 can be calculated as follows: R1 = R2 = (I /16µA) x RSH/2 Where I = Line current RSH = Shunt resistor or termination Resistor if a CT is used as the current sensor. The value of RSH, if used as the CT's termination resistor, should be less than the DC resistance of the CT's secondary winding. The voltage drop across RSH should not be less than 16mV at rated currents. The current into the A/D converter should be set at 14µA at nominal mains voltage. The voltage sense input saturates at an input current of ±25µA peak. Referring to Figure 3 the typical connections for the voltage sense input is illustrated. Resistors R3, R4 and R5 set the current for the voltage sense input. The mains voltage is divided down to 14V . The current into the A/D converter input is set at 14µA via resistor R5. INPUT SIGNALS W RMS L L RMS RMS RMS RMS Rated condition select (R0, R1, R2) The rated condition select pins R0, R1 and R2 are inputs, which configure the SA2002D for different rated conditions. This feature eliminates the need for different stepper motor gear ratios. The LED pulse output follows the average power consumption measured. *This figure not in parenthesis indicates that a MOP pulse followed by a MON pulse is treated as one energy pulse. The figure inside parenthesis means that a MOP pulse followed by a MON pulse is treated as two energy pulses. The Motor pulse rate is not restricted to 100 (200) pulses/kWh. The following examples show how different LED and motor pulse rates can be achieved: Example 1. A manufacturer designing a 220V/10A meter can choose to have the pins R2, R1 and R0 connected as for a 220V/20A (R2=0, R1=0 and R0=1). In comparison to table 1 the Rated Condition is now half (2200W), this in turn doubles the LED and Motor Pulse output rates as shown in the following table: 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 220V/10A 220V/20A 220V/40A 220V/80A 220V/6A 220V/30A 220V/60A Test Mode 6400 3200 1600 800 6400 3200 1600 Test Mode 100 (200) 100 (200) 100 (200) 100 (200) 100 (200) 100 (200) 100 (200) - R2 R1 R0 Rated Condition LED Output (Pulses/ KWh) Motor Pulse Rate (Pulses/ KWh)* Table 1 0 0 1 220V/10A 6400 100 (200) R2 R1 R0 Rated Condition LED Output (Pulses/ KWh) Motor Pulse Rate (Pulses/ KWh)* Example 2. A manufacturer designing a 220V/80A meter can choose to have the pins R2, R1 and R0 connected as for a 220V/40A (R2=0, R1=0 and R0=1). In comparison to table 1 the Rated Condition has doubled (17600W), this in turn halves the LED and Motor Pulse output rates as shown in the following table: 0 1 0 220V/80A 800 50 (100) R2 R1 R0 Rated Condition LED Output (Pulses/ KWh) Motor Pulse Rate (Pulses/ KWh)* |
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