sames

sames

SA2007P

6/12

http://www.sames.co.za

Figure 6: Signal flow block diagram

DEVICE CONFIGURATION

SIGNAL FLOW DESCRIPTION

The following is an overview of the SA2007P's registers. For a

detailed description of each parameter please refer to

parameter description section.

Figure 6 shows the various registers in the SA2007P's power

to pulse rate block. The inputs to this block are two single bit

pulse density modulated signals, each having a pulse rate of

641454 pulses per second at rated conditions. The

parameters Kc1, Kc2, Ne, Cs, Kr, Cres, and Cled contain

values which are read from the external EEPROM during

power up.

The divider

registers, Channel 1 Balance and Channel 2

Balance, are used for calibration and to balance the gain of

each channel. The Earth Leakage Compensation register is

used to compensate for any permissible earth leakage that

may cause the SA2007P to indicate a tamper condition at low

current. The Channel Select register selects the source

(channel 1 or channel 2) which will be used for the pulse output.

Register Rated Condition is used to program the rated

condition of the meter and feeds the registers LED-constant

and Counter Resolution with the applicable pulse rate. These

two registers are programmed to select the LED output rate

and the counter resolution (pulses per kWh) respectively. The

Counter Pulse Width register is used to program the pulse

width for the mechanical counter driver output MOP and MON.

Channel 1

Balance

÷Kc1

Channel 2

Balance

÷Kc2

Earth Leakage

Compensation

Ne

Channel Select (1, 2, auto) Cs

Rated Condition

÷Kr

Counter

Resolution

Cres

Counter

Pulse width

CPW

LED-Constant

Cled

MOP

MON

LED

Normally 6400p/kWh

Normally 1253p/s

Channel 1 Power

641454p/s

Channel 2 Power

641454p/s

PRELIMINARY