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

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D12

D14

D16

D18

D20

D22

D24

D26

KEY: (- = DON’T CARE); (V = VALUE/PARAMETER); (0,1 = LOGICAL VALUE); (X = BIT-XOR)

PRELIMINARY