sames

sames

SA2007M

6/10

http://www.sames.co.za

Earth loop tamper indication (ELT)

If the power measurements from both current channels differ

by more than 12.5%, (indicating a earth loop tamper

condition), the ELT output is set to zero. The SA2007M

continues to generate output pulses from the larger of the two

measured powers in this condition. The ELT output is active

low.

Direction indication (DIRO)

The SA2007M provides information about the energy flow

direction of both current channels on pin DIRO .

A logic 1 on pin DIRO indicates reverse energy flow of both

current channels. Reverse energy flow is defined as the

condition where the voltage sense input and current sense

input are out of phase (greater than 90 degrees).

Positive energy flow, when voltage sense and both current

sense input are in phase, is indicated on pin DIRO as a logic 0.

The DIRO output will toggle between 1 and 0 a rate of 1Hz

when one of the current channels measure positive energy

and the other negative energy. This condition may occur with a

improper installed or tampered meter.

The DIRO pin may be used to drive a LED in order to indicate

reverse energy.

Signal

Output

Value

Description

DIRO

1

0

Reverse energy flow

Forward energy flow

Out of phase current channels

1Hz

PRELIMINARY