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PDF PM9607AP Data sheet ( Hoja de datos )
| Número de pieza | PM9607AP | |
| Descripción | Energy Meter Evaluation Module | |
| Fabricantes | Sames | |
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Application Note:
Energy Meter Evaluation Module
PM9607AP
sames
INTRODUCTION
This Application Note describes the functionality of the
SA9607M and the SA9607P metering integrated circuits using
the PM9607AP evaluation module. The SA9607 family is a low
cost solution specifically designed to meet the needs of
markets that require both live and neutral energy
measurement, in order to detect possible meter tampering.
Using the SA9607 family the meter manufacturer is able to
build a meter that measures the energy consumption, even
during a tamper condition, and records it to a mechanical
counter.
This application note will focus on the practical use of the
SA9607 family. More detailed information specific to the
SA9607M or SA9607P can be found in the applicable
datasheet.
THE SA9607 SERIES ENERGY METER ICS
The SA9607 family is characterized by its ability to measure
live and neutral power consumption simultaneously. A
correctly installed meter should measure equal amounts of
power consumption in the live and neutral phases. During
meter tampering the two measurements are no longer equal.
The SA9607 will use the larger of the two currents for the
energy measurement. Differences of more than 12% between
the live and neutral power measurements are indicated on the
SA9607’s ELT output which can drive a LED directly.
The SA9607 are designed to drive mechanical counters
directly. The module is fitted with an impulse type counter that
increments with a single 71ms pulse. The SA9607 can also
drive low cost mechanical counters (stepper motors) that use
two consecutive pulses with opposing voltages to advance the
counter one position. The SA9607 outputs these two opposing
pulses in close succession, minimizing the chance of the
stepper motor being in the wrong phase after a power failure.
Calibration pulses, reverse power, earth loop tamper and
active channel are displayed with four LEDs fitted on the
module.
THE SA9607M PIN PROGRAMMABLE MONOCHIP
METER
Using the SA9607M, the rated conditions of the meter as well
as the LED pulse rate and counter resolution can be selected
for a particular meter design. The meter manufacture is thus
able to produce a range of meters utilizing the same counter
and the same metering constant with a single integrated
circuit. Calibration of the meter is done with trim-pots or
resistor ladders. Table 1 gives a short list of all the possible
meter configurations possible with the SA9607M using the
PM9607AP module. Note that the values of the current
transformer’s resistor values need to change to make some of
the rated conditions possible. This will be covered in the
Analog Section.
Setting
20A / 230V
40A / 230V
60A / 230V
1 pulse / kWh
10 pulse / kWh
100 pulse / kWh
Pin Status
RATED = 0
RATED = Open
RATED = 1
MP1 = 0, MP0 = 0
MP1 = 0, MP0 = 1
MP1 = 1, MP0 = 0
Table 1: A summary of the pin settings possible with the
SA9607M. Pin status 0 indicates connects to VSS and 1
indicates connection to VDD
THE SA9607P MONOCHIP METER WITH ON CHIP
CALIBRATION
The SA9607P uses an external EEPROM to store calibration
data as well as meter specific settings. A major advantage of
the SA9607P is that no external trim-pots or resistor ladders
are required to calibrate the meter. This greatly enhances the
meter reliability and can improve meter production times if
used in an automatic meter calibration system.
The SA9607P integrated circuit together with an external
EEPROM provides more meter setup features than the
SA9607M. Additional information regarding the meter (serial
numbers, client, and manufacture date) can also be stored in
the unused sections of the EEPROM memory. An IIC bus
based EEPROM is used to store configuration and meter
setup data for the SA9607P. The SA9607P will load this data
from the EEPROM during power up. During normal meter
operation it reloads periodically the data from the EEPROM.
The SA9607P never writes to the EEPROM. For more specific
configuration information please refer to the SA9607P
datasheet.
SPEC-0045 (REV. 1)
1/16
19-06-00
1 page  
PM9607AP
sames
Combining the two equations gives:
( RA + RB ) / 230V = RB / 14V
Values for resistors R4 = 10W , R5 = 24W k
chosen.
Substituting the values result in:
RB = 23.437kW
RA = RB x ( 230V / 14V – 1 )
RA = 361.607kW .
and R6 = W 1M
is
Standard resistor values of R1, R2, R3 and R4 are chosen to
be 120kW , 120W k , 12W 0k anW d 10 .
The capacitor C4 is used to compensate for phase shift
between the voltage sense inputs and the current sense inputs
of the device, in cases where CTs with phase errors are used.
The phase shift caused by the CT may be corrected by
inserting a capacitor in the voltage divider circuit. To
compensate for a phase shift of 0.18 degrees the capacitor
value is calculated as follows:
C = 1 / (2 x p x Mains frequency x R5 x tan (Phase shift angle))
C = 1 / ( 2 x p x 50 x 1MW tan (0.18 degrees ))
C = 1.013µF
Reference Voltage VREF
The VREF pin of the SA9607 is connected to a resistor that
determines the on chip bias current. The PM9607AP module is
set up for the SA9607M, so the bias resistor is made up of
resistor R17 and trimpot P1 in series. The multi turn trimpot P1
may be varied for precise calibration.
Calibration of the bias current is not necessary when using the
SA9607P as device calibration is loaded from the external
EEPROM.
Ground GND
The GND pin of the SA9607 is connected to the neutral phase,
which is halfway between VDD and VSS. Note that supply
bypass capacitors C1 and C2 are positioned as close as
possible to the supply pins of the device, and connected to a
solid ground plane.
Protection
A MOV together with R4 protects the transformer and the
voltage divider circuit against voltage transients.
Common mode and asymmetrical transients are attenuated
by the current setting resistors R8, R9 R10 and R11.
POWER SUPPLY
The PM9607AP module uses a transformer based power
supply to ensure flexibility for different counter drive
configurations. The maximum current that can be drawn by
the circuit is as follows:
The average power consumption of the module is usually less.
The current indicated in table 2 is worst-case peak pulse
current. The normal operating current of the module is closer
to 15mA. A 78LC05-voltage regulator is used to regulate the
voltage from the transformer. Two resistors R18 and R19
generate the analog ground voltage for the SA9607. The
SA9607 operates between 5 Volt and 0 Volt with its GND pin
connected to mid-rail.
Source
SA9607M/P IC
DIR LED
SEL1 LED
ELT LED
Pulse LED
Counter
GND ref
EEPROM
Total
Max current
5
5
5
5
5
11
3
2
41
Unit
mA
mA
mA
mA
mA
mA
mA
mA
mA
Table 4: Maximum peak current drawn by components on
the module
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5/16
5 Page 
PM9607AP
PCB LAYOUT
sames
Figure 8A: IIC Module Component layout
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Figure 9A: PM9607AP Component layout
11/16
11 Page | ||
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| PDF Descargar | [ Datasheet PM9607AP.PDF ] | |
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