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SA2005 Datasheet(PDF) 9 Page - Sames |
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SA2005 Datasheet(HTML) 9 Page - Sames |
9 / 16 page sames sames SA2005P 9/16 http://www.sames.co.za PARAMETER DESCRIPTION Refer to the EEPROM memory allocation map as well as the Signal flow diagram figure 7, for a description of the registers used in this section. Rated Condition (Kr) Kr is used to program the rated condition of the meter. Rated conditions from less than 10A to several 100A are possible. The rated conditions divider as well as the pre-divider is used to compensate for individual phase calibration. The three phases are calibrated to the phase with the lowest gain. Kr is calculated as follows: Krx=642 000/Rated volt/Rated current/6400x3600x1000/512 The SA2005P’s internal counters count from 0 so 1 must be subtracted from Kr: Kr = round(Krx)-1 Where: Krx is the real value Kr is the integer value Kr is made up of 1 byte (D20) Pre-divider (Cb1, Cb2, Cb3) The channel balance (Cb) value is used to balance the three phases. The rated conditions divider ratio must be calculated. Error measurements per phase are done with channel balance values set to zero. The measured error values are used to correct the error measurements of the three phases. The rounding error in the rated conditions divider is also compensated for in the channel balance calculations. One count on the channel balance value represent 100%/256. Gain = ((Krx-Kr+1) / Krx) x 100 Gain calculates the rounding error made by the rated conditions divider. Cb1 = (CHB1 - CBMIN + Gain) x 256 / 100 Cb2 = (CHB2 - CBMIN + Gain) x 256 / 100 Cb3 = (CHB3 - CBMIN + Gain) x 256 / 100 CHB1, CHB2, CHB3 is the measured channel balance %error that will be corrected CBMIN is the lowest channel balance %error measured between the three phases. LED Pulse-Rate (Cled) Two bits of byte D22 allow for the selection of 4 different LED- Pulse-rates. The LED pulse-width is 10ms. In fast pulse mode, the pulse-width is set to 71µs. D26[4:0] D27[7:0] Counter Resolution Counter Resolution (Cres) A 13 bit divider divide the pulse rate from the rated conditions divider down to the desired counter resolution. Cres is made up of bits 0 of 4 of byte D26 and byte D27. 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 D26. D26[7] D26[6] Counter Pulse-Width 1 0 0 - 1 0 284 ms 142 ms 71 ms D16[7] Creep threshold 0 1 0.02% of rated current 0.01% of rated current Creep current threshold (Ct) The creep current is expressed relative to the rated current of the meter. The SA2005P will not meter currents below the creep current. The creep current is implemented to prevent the meter from accumulating energy when no load is connected. Cs is made up of bit 7 of byte D16 D22[1] D22[0] Calibration LED - Output 0 1 1 0 1 0 1 0 6400 p/kWh 3200 p/kWh 1600 p/kWh 1252 pulses/second @ rated for fast calibration |
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