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SA2002P Folha de dados(PDF) 6 Page - Sames |
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SA2002P Folha de dados(HTML) 6 Page - Sames |
6 / 14 page sames SA2002P 6/14 http://www.sames.co.za DR-01283 DIR V I DIR t t t t Figure 7: Measured energy direction on DIR Mains Zero Crossing Indication (FMO) Figure 6 indicates the behavior of the FMO output relative to the voltage sense inputs. The square wave signal of FMO indicates the polarity of the mains voltage. Due to comparator offsets, the FMO low to high transition can occur within a range as shown in figure 6. The time between successive low to high transitions will be equal to the mains voltage period. The FMO output may be used during calibration. Signal Output Value Description DIRO 0 Reverse energy flow Forward energy flow 1 Direction Indication (DIRO) The SA2002P provides information about the energy flow direction on pin DIRO . A logic 0 on pin DIRO indicates reverse energy flow. 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 1. The DIRO pin may be used to drive a LED in order to indicate reverse energy. Figure 6: Mains zero crossing on FMO DR-01284 FMO MAINS t V t t Figure 7 shows the behavior of DIR, when energy reversal takes place. The time period for the DIR signal to change state, t , is the time it takes for the internal integrator to count (down) from its present value to zero. Thus the energy consumption rate determines the speed of change on DIR. DIR |
Nº de peça semelhante - SA2002P |
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