sames

sames

SA2007P

8/12

http://www.sames.co.za

LED Pulse-rate (CLED)

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

Pulse-rate as follows.

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

Counter Pulse-Width (CPW)

The pulse with 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:

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]

D24[0]

Counter Resolution

0

1

-

0

0

1

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 is

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

the channel select mode as follows:

Earth Leak Compensation (NE)

Earth leakage in domestic wiring systems could result in

tamper detection at low current levels. The SA2007P caters for

these conditions, by taking possible earth leakage into account

when comparing the power consumption in 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[3]

D26[2]

Metering Source

-

1

0

0

1

1

Automatic, channel 1 or 2 whichever

shows higher consumption

Channel 1

Channel 2

D22[1]

D22[0]

Calibrated LED - Output

0

0

1

0

1

-

6400 p/KWh

3200 p/KWh

1252 pulses/second @rated for

fast calibration

D24[6]

Counter Pulse-Width

0

1

71ms

142ms

D26[1]

D26[0]

Ne factor

0

0

1

0

1

-

0.15

0.076

0.038

PRELIMINARY