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SA2002P Datasheet(PDF) 8 Page - Sames |
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SA2002P Datasheet(HTML) 8 Page - Sames |
8 / 14 page sames SA2002P 8/14 http://www.sames.co.za PARAMETER DESCRIPTION Refer to the EEPROM memory allocation map table 1 as well as the Signal flow diagram figure 8, for a description of the registers used in this section. The Cor register divides the pulse-modulated signal with a programmable value of 495 with a variation of ±3.2% (481 to 512). Only the 5 least significant bits are required for this register. The Kr register is used to program the rated conditions of the meter. This feature is required for correct counter increments using the same meter design for various meter ratings from less than 10A to several 100A. The Kr register can have any integer value up to 128. The pulse rate is then further divided down by the Cled register to provide the required LED pulse rate. The Cled register provides 3 different dividing factors namely 1, 0.5 and 0.25. In addition using the Cled register the SA2002P can be set to fast mode. In fast mode the LED pulse output is a programmable high frequency output and is proportional to the instantaneous power consumption. This mode is useful for faster calibration times or can be used to interface to a micro-controller. Refer to figure 5 for the LED output timing diagram. The divider registers Cor and Kr are used for gain calibration. These two registers used together with the LED pulse-rate register (Cled) will generate the required meter constant (pulses per kWh). The following formula can be used to calculate Cor, Kr and Cled: Pre-Divider (Cor), Rated Condition (Kr) and LED Pulse- rate (Cled) registers Where: M = Meter constant (pulses per kWh) Unom = Meters nominal voltage Imax = Meters maximum current rating Cor = 495 default value, and can be varied by ±3.2% (481 to 512, integer values only). Kr = 8 bit register having any integer value up to 128. Cled depends on the two bits of byte D18: D18[1] D18[0] Cled dividing factor 0 1 1 0 1 0 1 0 1 0.5 0.25 This sets the LED pulse rate to fast mode of 641454/ Cor pulses per second. Default would be 641454/495 = 1296 pulses/sec. The initial value of Kr can be calculated from the above formula using Cor's default value 495 as follows: Krx = 641454 / Unom / Imax / M x 3600 x 1000 / 495 The SA2002P's internal counter counts from zero so a one must be subtracted from Kr: Kr = Round (Krx) - 1 Krx is the real value and Kr is the integer value. Once Kr has been established Cor can be calculated as follows: Corr = 495 x (1 + (Krx - (Kr + 1) ) / Kr Cor = Round (Corr) - 1 Where Corr is the real value and Cor the integer value. Cor is made up of bits 0 to 4 of byte D12 Kr is made up of 1 byte (D16) For further information see the example on calculating Kr and Cor. A 13 bit divider divides the pulse rate from the rated conditions divider down to the desired counter resolution. Cres can be calculated using the following formula: Cres is made up of bits 0 to 6 o f byte D21 and byte D20. Where: Counter Resolution (Cres) LED pulses / kWh Cres Counter pulses / kWh = D21[4:0] D20[7:0] Counter Resolution Counter Pulse-Width (Pw) The pulse width for the mechanical counter driver output is selectable to accommodate various step-motor and impulse- counter requirements. Pw is made up of bits 7 and 6 of byte D22. D22[7] D22[6] Counter Pulse-Width 1 0 0 - 1 0 284 ms 142 ms 71 ms Creep Current Threshold (Cs) The creep threshold is expressed relative to the rated current of the meter. The SA2002P will not meter currents below the 641454 CorxKr 3600 ((Unom x Imax)/1000) X M= X Cled |
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