SA9607P Ver la hoja de datos (PDF) - South African Micro Electronic Systems

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SA9607P

Programmable Single Phase Energy Metering IC with Tamper Detection

South African Micro Electronic Systems 

SA9607P

LED Pulse-rate (CLED)

Two bits of byte D22 allow for the selection of 3 different LED

Pulse-rates as follows.

D22[1]

0

0

1

D22[0]

0

1

-

Calibration LED - Output

6400 p/KWh

3200 p/KWh

1252 pulses/second @ rated for

fast calibration

Refer to LED output section for details on the LED pulse width.

Counter Pulse-Width (CPW)

The pulse width for the mechanical counter driver output is

selectable to accommodate various step-motor and impulse-

counter requirements. Bit 6 from byte D24 selects the pulse

rate as follows:

D24[6]

0

1

Counter Pulse-Width

71ms

142 ms

Counter Resolution (CRES)

Bit 1 and 0 from byte D24 allow for the selection of 3 different

counter resolutions. Note that one energy pulse is represented

by a MOP pulse followed by a MON pulse.

D24[1]

0

1

-

D24[0]

0

0

1

Counter Resolution

1 p/KWh

10 p/KWh

100 p/KWh

Channel Select Mode (CS)

For calibration purposes, the source for the energy metering

may be selected from a specific channel. The ELT-indication

is not influenced, but the metering is taken from the selected

channel only. For normal operation, the channel select mode

is set to automatic mode so that the larger of the two channels

are used for energy measurement. Bits 3 and 2 of byte D26

sets the channel select mode as follows:

D26[3]

-

1

0

D26[2]

0

1

1

Metering Source

Automatic, channel 1 or 2 whichever

shows higher consumption

Channel 1

Channel 2

Earth Leak Compensation (NE)

Earth leakage in domestic wiring systems could result in

tamper detection at low current levels. The SA9607P caters

for these conditions, by taking possible earth leakage into

account when comparing the power consumption on live and

neutral.

The value for the permissible earth leakage is usually around

30mA. It has to be adjusted according to the rated meter

condition and allows for derivations from the 30mA value. The

actual value of the leak current can be calculated from the

following formula:

Ileak = Rated current x Ne

Ileak is the earth leakage current in mA used for correction.

This value is subtracted from the difference measured between

live and neutral power.

Ne is made up of bits 1 and 2 of byte D26 and can be set as

follows:

D26[1]

0

0

1

D26[0]

0

1

-

Ne factor

0.15

0.076

0.032

http://www.sames.co.za.

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