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SA2007PSA Datasheet(PDF) 7 Page - Sames |
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SA2007PSA Datasheet(HTML) 7 Page - Sames |
7 / 12 page sames sames SA2007P 7/12 http://www.sames.co.za PARAMETER DESCRIPTION Refer to the EEPROM memory allocation map as well as the Signal flow diagram figure 6, for a description of the registers used in this section. EEPROM Memory Allocation The following table shows the EEPROM memory allocation as well as the corresponding name. The uneven byte always contains the XORed byte of the previous even byte. This is the checksum byte used by the SA2007P to ensure data integrity. Channel Balance (KC) Kc defines the dividing factor, which is applied to the incoming pulse rate. This value is typically 511. This factor is used for calibration and gain balancing of the 2 current channels. The value for Kc is usually between 400 and 640. Kc is made up of 2 bytes, D12 and D14 or D16 or D18 which forms a 10 bit value. Rated Condition (KR) Kr is used to program the rated condition of the meter. This feature is required for a correct counter increment of meters designed for different rated conditions using the same integrated circuit. Rated conditions from less than 10A to several 100A are possible. The channel balance values should be used to compensate for rounding errors in Kr. Kr is calculated as follows: Kr =(1252 x 1000 x 3600)/(Rated volt x Rated current x 6400)-1 Kr is made up of 1 byte (D20) Description 2 E Address Contents Bit [7:0] Name Channel 1 Balance LSB Channel 1 Balance MSB Channel 2 Balance LSB Channel 2 Balance MSB Rated Condition Led Pulse-rate Counter Pulse-width Counter Resolution Earth leak Compensation Channel Select Mode 12 13 14 15 16 17 18 19 20 21 22 23 24 24 25 26 26 27 Kc1 XOR of ADDR 12 Kc1 XOR of ADDR 14 Kc2 XOR of ADDR 16 Kc2 XOR of ADDR 18 Kr XOR of ADDR 22 Cled XOR of ADDR 22 Cpw Cres XOR of ADDR 24 Ne Cs XOR of ADDR 24 vvvvvvvv xxxxxxxx ------vv xxxxxxxx vvvvvvvv xxxxxxxx ------vv xxxxxxxx vvvvvvvv xxxxxxxx ------vv xxxxxxxx 0v------ ------vv 1xxxxxxx ------vv ----vv-- xxxxxxxx D12 D14 D16 D18 D20 D22 D24 D26 KEY: (- = DON’T CARE); (V = VALUE/PARAMETER); (0,1 = LOGICAL VALUE); (X = BIT-XOR) PRELIMINARY |
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