SPEC-1538 (REV. 7)

14/23

29-09-2017

SA4301A

voltage fail LED driver outputs will pulse with a repetition rate

of approximately 1Hz. A phase sequence error will only be

indicated if three stable phase voltages are present. When

the SA4301A detects a missing phase voltage on a specific

channel that channel will be masked on the programmable

adder, which means that any residual energy measured on

that channel will not appear on the LED and motor outputs.

PH/DIR = 0 (Direction indication): When PH/DIR is low

(logic 0) energy direction information for each individual

channel is available on the PH1, PH2 and PH3 pins. A logic

1 on any of these pins indicates reverse energy flow for the

specific channel and a logic 0 indicates positive energy flow.

Reverse energy flow is defined as the condition where the

voltage and current input signals on a specific channel are

out of phase (phase angle greater than 90 degrees), while

positive energy flow is defined as the condition where the

voltage and current input signals on a specific channel are in-

phase (phase angle smaller than 90 degrees). Referring to

Figure 11 the direction LED for a specific channel will be

activated when the direction is negative and de-activated

when the direction is positive. A power-on reset at start-up

will set the direction indication for all channels to low (logic 0).

The direction LEDs will therefore be turned off at start-up.

Once negative energy has been detected on a specific

channel the LED will turn on. If a missing phase voltage is

detected on a specific channel or if the energy measured on

that channel is below the anti-creep threshold the direction

indication of that channel will default to logic 0, thereby also

turning the direction LED of that channel off. If a phase

sequence error is detected the direction outputs still indicate

the energy direction detected on the specific channels.

ANTI-TAMPER FEATURES

LED Array

The SA4301A caters for numerous meter tamper conditions, which are indicated by an LED array as follows:

Figure 11: Multiplexing tamper LED array

R2

R1

R3

SA4301A

PH2

PH3

PH/DIR

PH1

PHASE 3

DIR 3

Channel 3

PHASE 2

DIR 2

Channel 2

PHASE 1

DIR 1

Channel 1

PH (drive)

DIR (sink)

1k



1k



1k



MAINS1

DIR1

DIR2

DIR3

MAINS2

MAINS3

D2

D1

D4

D3

D6

D5