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SA2007MPA Datasheet(PDF) 6 Page - Sames |
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SA2007MPA Datasheet(HTML) 6 Page - Sames |
6 / 10 page 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 |
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