ADSST-EM-2030 Analog Devices, ADSST-EM-2030 Datasheet - Page 17

• Manufacturer Part Number: ADSST-EM-2030
• Description: 3-Phase Electronic Energy Meter Chipset
• Manufacturer: Analog Devices

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DataSheet
4
3. The ADSST-EM-2030 will return back six bytes of current
4. Compute the new constants on a PC or a calculator in Hex as:
5. These coefficients can then be written by sending the 0x82
6. To verify the coefficients, send 0x02 to the chipset to receive
7. The default constants in the chipset for all the low gain current
High Gain Current Calibration
1. Power up the meter by setting the current source at 5 amps
2. Send 0x03 command on the SPI to the chipset for reading
3. The ADSST-EM-2030 will return back six bytes of current
4. Compute the new constants on a PC or a calculator in Hex as:
5. These coefficients can then be written by sending the 0x83
6. To verify the coefficients, send 0x03 to the chipset to receive
7. The default constants in the chipset for all the high gain
Power Calibration
The meter can now be calibrated for power for each phase. The
calculation requires the default constants that are stored in the
internal nonvolatile memory. Due to the chipset’s in-built feature
of performing automatic gain switching for the current channels,
the power needs to be calibrated at low gain (i.e., high currents)
and high gain (i.e., low currents). It is recommended that low
gain calibration is performed at I
performed at I
specified for 230 V operation with I
REV. 0
U
values for the three phases: I
command to the chipset on the SPI. Refer to Table XXIV
for the Write Data sequence. The coefficients are sent in the
same sequence as in the Table XXIV. This automatically
stores the current constants in the chipsets’ internal nonvolatile
memory.
the six bytes of data as current coefficients.
channels is 0x7000.
on all three phases (i
the current constants as: C
values for the three phases (i
command to the chipset on the SPI. Refer to Table XXV for
the Write Data sequence. The coefficients are sent in the same
sequence as in Table XXV. This automatically stores the
current constants in the chipset’s internal nonvolatile memory.
the six bytes of data as current coefficients.
current channels is 0x2300.
.com
NOMINAL
C
C
C
/2. In the present example, the meter is
C
C
C
R
IA
IB
′ =
′ =
IC
).
′ =
iA
iB
′ =
′ =
iC
′ =
I
I
I
I
I
I
iA
i
MAX
i
i
i
R
A
i
i
R
B
R
C
, C
R
A
A
A
R
B
R
C
, I
, i
×
×
×
×
×
×
iB
B
B
and high gain calibration is
C
C
C
MAX
, i
, and I
, and C
C
C
C
IA
IB
IC
C
iA
iB
iC
).
at 60 amps.
C
iC .
.
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–17–
Low Gain Power Calibration
The default power constant for all three phases at low gain is
0x3EE4. By sending commands such as 0x07, 0x09, and 0x0B
on the SPI, the chipset will send six bytes each, corresponding
to Phases A, B, and C.
Procedure
1. Power up the meter after setting the voltage at 230 V, current
2. Read the default power constants for Phase A by sending 0x07
3. Read the default constants for Phase B by sending 0x09
4. Read the default power constants for Phase C by sending 0x0B
5. Read the value of power as shown by the reference meter for
6. If the voltage and current on the source have been set at
7. Send command 0x87 followed by P'
High Gain Power Calibration
The default power constants for all three phases at high gain
is 0xAA0. By sending commands such as 0x06, 0x08 and 0x0A
on SPI, the chipset will send six bytes each, corresponding to
Phase A, B, and C.
Procedure
1. Power up the meter after setting the voltage at 230 V, current
2. Read the default power constants for Phase A by sending 0x06
3. Read the default constants for Phase B by sending 0x08
4. Read the default power constants for Phase C by sending 0x0A
5. Read the value of power as shown by the reference meter for
at 60 amps and power factor at unity.
command on the SPI. The chipset will return six bytes, giving
the default constants P
command on the SPI. The chipset will return six bytes,
giving the default constants P
Phase B.
command on the SPI. The chipset will return six bytes,
giving the default constants P
Phase C.
the three phases, say P
230 V and high current (60 amps), then the reference meter
should display for each phase a value of P
calculate new constants as:
chipset will accept the values and store these as power constants
for Phase A. Send command 0x89 followed by P'
command 0xB9 followed by P'
these power constants for Phase B and Phase C respectively.
at 5 amps and power factor at unity.
command on the SPI. The chipset will return six bytes, giving
the default constants P
command on the SPI. The chipset will return six bytes, giving
the default constants P
command on the SPI. The chipset will return six bytes, giving
the default constants P
the three phases, say P
P
P
P
CA
CB
CC
A
′ =
′ =
A
CA
′ =
CA
CB
CC
, P
, P
for Power constants for Phase B.
for power constants for Phase A.
for Power constants for Phase A.
for Power constants for Phase C.
B
B
P
P
P
, and P
, and P
CA
CB
CC
CB
CC
CC
×
×
×
ADSST-EM-2030
for power constants for
for power constants for
P
P
value. The chipset will store
P
P
P
REF
REF
P
REF
C
C
A
B
C
CA
.
.
value on the SPI. The
REF
CB
. Using this,
value and then