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SA2007PSA Scheda tecnica(PDF) 4 Page - Sames |
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SA2007PSA Scheda tecnica(HTML) 4 Page - Sames |
4 / 12 page 4/12 sames sames SA2007P Figure 3: Analog input internal configuration http://www.sames.co.za FUNCTIONAL DESCRIPTION The SA2007P is a CMOS mixed signal Analog/Digital integrated circuit, which performs power/energy calculations across a power range of 1000:1, to an overall accuracy of better than Class 1. The integrated circuit includes all the required functions for single phase power and energy measurement such as oversampling A/D converters for the voltage and current sense inputs, power calculation and energy integration. Internal offsets are eliminated through the use of cancellation procedures. The SA2007P incorporates an anti-tamper scheme by continuously measuring the power consumption on both LIVE and NEUTRAL lines. A fault is indicated when these measurements differ by more than 12.5%. The SA2007P generates pulses with a frequency proportional to the larger of the two current measurements. The source (LIVE or NEUTRAL) for these pulses is indicated on the SEL1 pin. The metering of energy consumption is taken from the source, which shows the higher consumption. Various pulse outputs (MOP, MON and LED) are available. The pulse rate on these pins follows the active power consumption measured. A low voltage stepper may be driven directly from the device by connecting it between the MOP and MON pins, alternatively an impulse counter may be driven directly by connecting it between MOP and V . SS The SA2007P configures itself from an external low cost EEPROM that contain all meter configurations and calibration data. No external trimming is required for this device. Calibration of the meter may be fully automated. POWER CALCULATION In Figure 7, the voltage drops across the current transformers terminating resistors are converted to currents for each current sense input, by means of resistors R and R (channel 10 11 1) as well as R and R (channel 2). The current sense input 12 13. saturates at an input current of ±25µA peak. The mains voltage (230VAC) is divided down through a divider to 14V . The current into the A/D converter input is set at RMS 14µA at nominal mains voltage, via resistor R (1MW). RMS 7 See Device Configuration for more details on the processing of measured energy to frequency outputs. ANALOG INPUT CONFIGURATION The input circuitry of the current and voltage sensor inputs are illustrated in figure 3. These inputs are protected against electrostatic discharge through clamping diodes. The feedback loops from the outputs of the amplifiers A and A IV generate virtual shorts on the signal inputs. Exact duplications of the input currents are generated for the analog signal processing circuitry. AUTOMATIC DEVICE CONFIGURATION (BOOT UP) During power up, registers containing configuration and calibration information are updated from an external EEPROM. The device itself never writes to the EEPROM so any write protect features offered by manufacturer of EEPROM's may be used to protect the configuration and calibration data of the meter. The device reloads its configuration every 1193 seconds from the external EEPROM in order to ensure correct operation of the meter. Every data byte stored in the EEPROM is protected with a checksum byte to ensure data integrity. ELECTROSTATIC DISCHARGE (ESD) PROTECTION The SA2007P integrated circuit's input's/outputs are protected against ESD. POWER CONSUMPTION The power consumption rating of the SA2007P integrated circuit is less than 30mW. VOLTAGE SENSOR INPUT IVP DR-01288 SS V CURRENT SENSOR INPUTS IIP IIN SS V VDD SS V VDD DD V GND A V A I PRELIMINARY |
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