Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
SA2002P Datasheet(PDF) 9 Page - Sames |
|
SA2002P Datasheet(HTML) 9 Page - Sames |
9 / 14 page sames SA2002P 9/14 http://www.sames.co.za Example of calculating Kr and Cor values Metering specifications: Unom = 230V Imax = 80A Meter constant = 6400 p/kWh Calculate the Kr value: = 40 (round Krx up to convert to integer) The value 39 is stored in the Kr register. The pre-divider (Cor) value is calculated next. Cor is programmable to divide between 481 and 512. Only the 5 least significant bits need to Krx = 641454 / Unom / Imax / M x 3600x1000/495 Krx = 641454 / 230 / 80 / 6400 x 3600 x 1000 / 495 Krx = 39.61549 Krx Kr = Krx-1 Kr = 39 be programmed. During the Kr calculation the value was rounded up and any rounding error is now taken into account. A ratio of the rounding "error" is calculated relative to the center of the variable range of Cor (481 - 512). Store the calculated values in the EEPROM Ensure that the device reload its registers from the EEPROM by means of the RLOAD pin or power down the meter and power up again. The meter is now set up with the correct register values but not yet calibrated. Measure the %Error with a Watt hour standard The %Error will be worked back into the calculations above. For this example we will assume a 2.83% error between the correct energy value and energy measured by the SA2002P. Recalculate the Kr value The value 40 is stored in the Kr. The Cor value must be recalculated. Store the calculated values in the EEPROM and the meter is calibrated. Corr = 495 x (1 + (Krx - (Kr + 1)) / Krx) Corr = 495 x (1 + (39.61549 - 40) / 39.61549) Corr = 495 x 0.990294 Corr = 490.1955 Corr = 490 (Convert to Integer) Cor = Corr -1 Cor = 489 %Error =(Measured Energy - Real Energy)/Real Energy x 100 Krx = 641454 / Unom / Imax / M x 3600 x 1000 / 495 x (1 + %Error / 100 ) Krx = 641454 / 230 / 80 / 6400 x 3600 x 1000 / 495 x 1.0283 Krx = 40.73661 Krx = 41 (Round up and make integer value) Kr = Krx-1 Kr = 41-1 Kr=40 Corr = 495 x (1 + (Krx - (Kr + 1)) / Krx) Corr = 495 x (1 + (40.7366 - 41) / 40.7366 Corr = 495 x 0.993534 Corr = 491.7995 Corr = 492 (Convert to Integer) Cor = Corr-1 Cor = 491 The following example shows how to calibrate the meter D14[2] Metering direction select 0 1 Bi-directional energy measurement Positive energy measurement D14[3] DC or AC measurement mode 0 1 AC measurement mode DC measurement mode D14[0] Creep threshold 0 1 0.02% of rated current 0.01% of rated current creep threshold. The creep threshold is implemented to prevent the meter from accumulating energy when no load is connected. Cs is made up of bit 0 of byte D14. Metering direction select (Ds) The SA2002P may be configured to measure positive energy or positive and negative energy. Ds is made up of bit 2 of byte D14. DC or AC measurement mode (Dc) The SA2002P may be configured to measure AC energy or DC energy. In case of AC measurement selection, the device will track the mains frequency for offset cancellation purposes. In DC measurement mode the device is locked to a fixed frequency for offset cancellation. The FMO output is switched to 28Hz in DC mode. Dc is made up of bit 3 of byte D14. |
Número de pieza similar - SA2002P |
|
Descripción similar - SA2002P |
|
|
Enlace URL |
Política de Privacidad |
ALLDATASHEET.ES |
¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Intercambio de Enlaces | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |