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PDF SA2005PSA Data sheet ( Hoja de datos )

Número de pieza SA2005PSA
Descripción Programmable Three Phase Power / Energy Metering IC for Stepper Motor / Impulse Counter Applications
Fabricantes Sames 
Logotipo Sames Logotipo



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Programmable Three Phase Power / Energy Metering
IC for Stepper Motor / Impulse Counter Applications
SA2005P
FEATURES
+ Direct drive for electro-mechanical counters or stepper
motors
+ Calibration and setup stored on external EEPROM - no
trim-pots required
+ Flexible programmable features providing ease of
implementation for meter manufacturers
+ Per phase energy direction and voltage fail indication
+ Precision oscillator on chip
sames
+ Meets the IEC 521/1036 Specification requirements for
Class 1 AC Watt hour meters
+ Operates over a wide temperature range
+ Easily adaptable to different signal levels
+ Adaptable to different types of sensors
+ Precision voltage reference on-chip
+ Protected against ESD
DESCRIPTION
The SAMES SA2005P provides a single chip active energy
metering solution for three phase mechanical counter-based
meter designs.
Th SA2005P does not require any external trim-pots or resistor
ladders for meter calibration. Calibration and meter
configuration information is stored on a small external
EEPROM.
Meter setup stored on the EEPROM includes various metering
direction modes (total sum, absolute sum, positive or negative
energy) phase calibration data, rated metering conditions,
LED pulse rate, counter pulse width, counter resolution and
creep current.
A programmable rate pulse output is available for meter
calibration purposes. Per phase voltage fail and voltage
sequence faults as well as energy direction indication are
available as LED outputs. Programmable dividers enable
various mechanical counter or stepper motor counter
resolutions.
A precision oscillator, that replaces an external crystal, is
integrated on chip. A voltage reference is integrated on chip.
The SA2005P integrated circuit is available in 24-pin dual in
line plastic (DIP-24) and small outline (SOIC-24) package
options.
VDD VSS
IIN1
IIP1
IVN1
IIN2
IIP2
IVN2
IIN3
IIP3
IVN3
GND
I1 CHANNEL
X
V1 BALANCE
I2
CHPARNONGE.L
PROGRAM-
POWER
TO
X MABLE
V2 BAALDADNECRE
PULSE
ADDER
RATE
I3
X CHANNEL
V3 BALANCE
LED
MON
MOP
PH / DIR
PH1
PH2
PH3
REF
TIMING & CONTROL OSC INTERFACE
RLOAD
dr-01605
VREF
TEST
SCL SDA
Figure 1: Block diagram
SPEC-0086 (REV. 2)
1/16
07-02-01

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SA2005PSA pdf
SA2005P
sames
rated current the resistor values should be selected for input
currents of 16µARMS. Referring to figure 8, the resistors R1 and
R2 on current channel 1, resistors R3 and R4 on current
channel 2 and resistors R5 and R6 on current channel 3, define
the current level into the current sense inputs of the SA2005P.
The current sense inputs saturates at an input current of
±25µA peak. Resistors R29, R30 and R31 are used as current
transformer termination resistors. The voltage drop across the
termination resistors should be at least 20mV at rated
conditions. Values for the current sense inputs are calculated
as follows:
R1 = R2 = ( IL / 16µARMS ) x R29 / 2
R3 = R4 = ( IL / 16µARMS ) x R30 / 2
R5 = R6 = ( IL / 16µARMS ) x R31 / 2
Where:
IL = Line current/CT-ratio
In case a current transformer is used for current sensing the
value of the termination resistors should be less than the
resistance of the CT's secondary winding.
Voltage Sense Inputs (IVN1, IVN2, IVN3)
The mains voltage are measured by means of a resistor divider
and the divided voltage are converted to a current. The current
into the voltage sense inputs (virtual ground) should be set to
14µARMS at rated voltage conditions. The individual mains
voltages are divided down to 14VRMS per phase. The resistors
R12, R13 and R14 (figure 8) set the current for the voltage
sense inputs. The voltage sense inputs saturate at an input
current of ±25uA peak.
Voltage Reference Connection (VREF)
A bias resistor of 24k provides an optimum bias conditions on
chip. Calibration of the SA2005P is done by means of divider
ratios stored on an external EEPROM. This is described in the
Device Configuration section.
Serial Data (SDA)
The SDA pin connects directly to the SDA pin of an external
EEPROM. The pin is used to transfer data between the
EEPROM and the SA2005P. An external pull-up resistor in not
needed.
Serial Clock (SCL)
The SCL pin connects directly to the SCL of an external
EEPROM. The SCL output is used to strobe data at a rate of
50kHz out of the EEPROM. An external pull up resistor is not
needed. The SCL output uses a soft driver and may be
overdriven by the calibration equipment.
Reload (RLOAD)
A falling edge on the RLOAD pin will trigger a register update
from the external EEPROM. This feature may be used during
calibration to load updated register data in the SA2005P. For
normal operation of the SA2005P the RLOAD pin may be left
floating.
Test Inputs (TEST)
The TEST input is the manufacturers test pin and must be
connected to VSS in a metering application.
OUTPUT SIGNALS
LED Output (LED)
Four options for the LED output pulse rate are available, 6400,
3200, 1600 pulses per kWh, and a pulse rate of 1252 pulses
per second at rated conditions. At 1252 pulses per second t LED
is 71µs, for the other options tLED is 10ms. The LED output is
active low as shown in figure 4.
LED
VDD
VSS
DR-01332
tLED
Figure 4: LED pulse output
Motor Output (MOP, MON)
The motor pulse width is programmable for 71ms, 142ms and
284ms. The MON pulse will follow the MOP pulse within the
selected pulse width time. This prevents the motor armature
being in the wrong position after a power failure. Both MOP
and MON outputs are active high. A MOP pulse followed by a
MON pulse represents one energy pulse. The motor drive
waveforms are shown in figure 5.
MOP
VDD
VSS
VDD
MON
VSS
DR-01559
tm tm tm
Figure 5: Motor drive on MON and MOP pins of device
Multiplex Output (PH/ DIR)
The PH/DIR output enables either direction or voltage
information on the phase LED driver outputs (PH1, PH2 and
PH3). This multiplex output switches between logic 1 and 0 at
a frequency of approximately 280Hz. A logic 1 enables energy
direction information on the LED driver outputs and a logic 0
enables voltage information.
http://www.sames.co.za
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SA2005PSA arduino
SA2005P
Recalculate the rated conditions
Krx = 642 000 / Rated volt / Rated current / 6400 x 3600 x
1000 / 512 x (1 + %MinError / 100 )
Krx = 642 000 / 230 / 80 / 6400 x 3600 x 1000 / 512 x 1.015
Krx = 38.9077
Kr = 38 - 1 = 37
The 37 are stored in the rated register.
The channel balance values are adjusted to make provision for
the rounding error.
Gain = ((Krx - Kr +1 ) / Krx ) x 100
Gain = (( 38.9077 - 38 ) / 38.9077 ) x 100
Gain = 2.33
The channel balance pre-devider value must be recalculated.
(BMIN will be the lowest %error value, in this case 1.5%,
CHB1, CHB2 and CHB3 are the individual phase %errors
measured.
Cb1 = (CHB1 - CBMIN + Gain ) x 256 / 100
Cb1 = (1.5 - 1.5 + 2.33 ) x 256 / 100 = 5.97 =5
Cb2 = (CHB2 - CBMIN + Gain ) x 256 / 100
Cb2 = ( 5.2 - 1.5 + 2.33 ) x 256 / 100 = 15.43 = 15
Cb3 = (CHB3 - CBMIN + Gain ) x 256 / 100
Cb3 = (3.2 - 1.5 + 2.33 ) x 256 / 100 = 10.316 = 10
Store the calculated values in the EEPROM and the meter is
calibrated.
sames
http://www.sames.co.za
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