SA2007P Datasheet, PDF (8/12 Pages) Sames – Programmable Single Phase Energy Metering IC with Tamper Detection

SA2007P
LED Pulse-rate (CLED)
Two bits of byte D22 allow for the selection of 3 different LED
Pulse-rate as follows.
D22[1]
0
0
1
D22[0]
Calibrated LED - Output
0
6400 p/KWh
1
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 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:
D24[6]
0
1
Counter Pulse-Width
71ms
142ms
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] Counter Resolution
0
1 p/KWh
0
10 p/KWh
1
100 p/KWh
sames
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:
D26[3]
-
1
0
D26[2] Metering Source
0
Automatic, channel 1 or 2 whichever
shows higher consumption
1
Channel 1
1
Channel 2
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[1]
0
0
1
D26[0] Ne factor
0
0.15
1
0.076
-
0.038
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PRELIMINARY