sames
SA9110A APPLICATION NOTE
PM9110BF
MONOCHIP THREE PHASE BIDIRECTIONAL
KILOWATT HOUR METERING MODULE
FEATURES
! Performs bidirectional energy metering
and includes a 7 digit LCD driver with
announciators
! 4 externally selectable on-chip tariff registers
! An additional total energy register
according to IEC1107 Mode D
! Pulse output for calibration
! Total power consumption rating below
100mW
! Uses current transformers for current
sensing
! Meets the accuracy requirements for ! Operates over a wide temperature range
Class 1 AC Watt hour meters
! Optical interface for electronic reading
! Demonstration software included
DESCRIPTION
The SAMES monochip three phase bidirectional kilowatt hour metering module, the
PM9110BF, provides all the required metering functions including energy measurement, a 7 digit LCD driver, a tariff selection facility, an optical port as well as a pulse
output for calibration purposes.
Energy consumption is determined by the power measurement being integrated over
time.
This method of calculation takes the power factor into account.
This application utilises the SAMES SA9110AFA monochip three phase bidirectional
kilowatt hour metering IC for energy measurement.
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PM9110BFX
PDS038-SA9110A-001
REV. 2
28-06-00
PM9110BF
BLOCK DIAGRAM
LOAD
DISPLAY
SCROLL
TARIF
SELECT
RESET
PCLK
PDTA
PGM
SA9110A
ISOLATED
CALIBRATION
INTERFACE
PULSE
OUTPUT
BATTERY
BACKUP
OPTICAL
PORT
EXTERNAL
POWER SUPPLY
5V POWER
SUPPLY
DR-01103
SUPPLY
ABSOLUTE MAXIMUM RATINGS*
Parameter
Symbol
Supply Voltage (Note 1)
VAC
Storage Temperature
TSTG
Operating Temperature
TO
Note 1:
Note 2:
Min
-25
-10
Max
540
+125
+70 (Note 2)
Unit
V
°C
°C
Voltages are specified with reference to Neutral
The SA9110A integrated circuit is specified to operate over the temperature
range -10°C to +70°C. The module functionality will, however, depend upon
the external components used.
*Stresses above those listed under “Absolute Maximum Ratings” may cause permanent
damage to the device. This is a stress rating only. Functional operation of the device
at these or any other conditions above those indicated in the operational sections of this
specification, is not implied. Exposure to Absolute Maximum Ratings for extended
periods may affect device reliability.
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PM9110BF
ELECTRICAL CHARACTERISTICS
(Over the temperature range -10°C to +70°C, unless otherwise
consumption figures are applicable to the PM9110BFE only.)
Parameter
Symbol Min Typ Max Unit
Supply Voltage (x3 Phase)
VAC
180
230 265
V
(Continuous)
Power Consumption
100 m W
Isolation Voltage1
Opto-coupler Output
Current
Opto-coupler Input
Current
VIS
2500
V
IO
10
mA
II
10
mA
specified. Power
Condition
PM9110BFE
From external
power supply
Continuous
VOL = 1V
Note 1: Isolation voltage may be specified, depending on customer requirements.
PIN DESCRIPTION
Designation
SK1
5-Pin
Header
connector
SK2
2-Pin
Header
connector
MAINS
CT1
CT2
CT3
POWER
Description
Isolated programming interface
Isolated pulse output
Voltage Supply Connected to Phase 1
Voltage Supply Connected to Phase 2
Voltage Supply Connected to Phase 3
Voltage Supply Connected to Neutral Line (common)
Phase 1 (Orientation indicated on PCB)
Phase 2 (Orientation indicated on PCB)
Phase 3 (Orientation indicated on PCB)
5V DC Supply Voltage
0V DC Supply Voltage
sames
3/14
PM9110BF
FUNCTIONAL DESCRIPTION
1. Energy Calculation
This Application Note should be read in conjunction with the SA9110A Data Sheet.
In the Application Circuit (see Figure 2), the output current from the current sensors
will be between 0 and 16µARMS. The current input stage of the module saturates at
input currents greater than18µARMS. The mains voltage (Voltage + 15% - 20%) is
used to perform the energy calculation, together with the current information from
the current sensor (current transformers).
The SA9110AFA integrated circuit may be adjusted to accomodate any voltage or
current values. The method for calculating external component values is described
in section 9 (Circuit Description).
The accumulated energy is directly displayed on a 7 digit LCD. This unique
application offers a host of additional features, which are dealt with below.
2.
Electrostatic Discharge (ESD) Protection
The device's inputs/outputs are protected against ESD. The modules resistance to
transients will be dependant upon the protection components used.
3.
Power Consumption
The overall power consumption rating for this power metering application (Figure
2), is under 100mW, excluding the current sensors.
4.
Isolation
The programming interface and pulse output are isolated from the module which
is at mains potential, via opto-couplers.
5.
Isolated Programming Interface
This isolated interface is provided to allow the user to programme the tariff register
values, calibration constants and manufacturer/meter identification codes. This
port is enabled by inserting the jumpers J8, J9 and J10. The programming may be
performed via the parallel port of a personal computer.
The designation of the pins on connector SK1 are given below:
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PM9110BF
Pin
1
2
3
4
5
PM9110BF
Description
GND
PB
PCLK
PDTA
PGM
PC Parallel Connectors (Suggested)
Pin
Description
18
GND
2
D1
4
D3
5
D4
3
D2
Note: The recommended connections above are applicable for the demonstration
software provided with the PM9110BF.
6.
Optical Port
The optical port has been designed to meet the IEC1107 Mode D specification. This
facillity offers a pulse output as well as a serial data meter reading facility.
Three types of interfacing elements from the PM9110BF are available:
a) Infra-red optical port
b) Red LED
c) Opto-coupler
In order to maximise the intensity of the element, it is suggested that only one of
the outputs be used at any one time.
7.
Jumper
Element
J5
J6
J7
Opto Coupler
Infra Red LED
Red LED
Liquid Crystal Display (LCD)
The PM9110BF has a LCD comprising of seven digits with announciatiors.
To cater for compatibility with future devices four jumpers are provided for
backplane driving configurations. The PM9110BF boards are shipped to the
customer with jumpers in a default configuration.
8.
Tariff, Scroll and Reset Functions
Tariff Selection
A dual DIP switch provides the user with the facility to set the active tariff register
in which consumption will be accumulated.
The active register is indicated on the LCD.
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PM9110BF
Scroll Facility
The 4 registers may be sequentially displayed by activating the scroll button. The
contents of the register selected for display is retained on the display for a period
of 10 seconds, provided that the push button is not activated during this period. After
the 10 seconds has elapsed, the display defaults to the "active" register defined by
the status of the tariff DIP switches.
The register selected for display via the scroll button is indicated by the relevant
announciatiors.
Reset Function
By pressing the Reset button the contents of the RAM of the SA9110A device is set
to the default conditions.
Jumpers J8, J9 and J10 must be removed to use this feature.
It is strongly recommended that the provision of this facility is not made available
on production meters.
9.
Circuit Description
The module is supplied from an external 5V DC supply.
The most important external components are:
C7, C9, C 10 and C11 are the outer loop capacitors for the integrated oversampling
A/D converters. The typical value of C7 is 2.2nF and the value of C9, C10 and C11
is 560pF.
The actual values determine signal to noise and stability performance.
tolerances should be within ± 10%.
The
C4, C5, C6 and C8 are the inner loop capacitors for the integrated oversampling A/
D converters. The typical value of C4, C5, C6 and C8 is 3.3nF. Values smaller than
0.5nF and larger than 5nF should be avoided.
Terminated current sensors (current transformers) are connected to the current
sensor inputs of the SA9110A through current setting resistors (R8..R13).
The resistor values should be selected for an input current of 16µARMS into the
SA9110A at the rated line current.
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PM9110BF
The values of these resistors should be calculated as follows:
Phase 1:
R8 = R9 = (IL1/16mA) * R18/2
Phase 2:
R10 = R11 = (I L2/16mA) * R19/2
Phase 3:
R12 = R13 = (I L3/16mA) * R20/2
Where ILX
= Secondary CT current at rated conditions.
R18, R19 and R20 =
Termination resistors of the three current transformers.
R1A+ R1B, R4 and R15 set the current for the phase 1 voltage sense input. R2A + R2B,
R5 + P5 and R16 set the current for phase 2 and R3A + R3B, R6 + P6 and R17 set the current
for phase 3. The values should be selected so that the input currents into the voltage
sense inputs (virtual ground) are set to 14mARMS for rated line voltage. Capacitors
C1, C2 and C3 are for decoupling and phase compensation.
R7 defines all on-chip bias and reference currents. With R7 = 24kΩ, optimum
conditions are set. Any changes to R7 will affect the output quadratically (i.e: ∆R
= +5%, ∆f = +10%).
XTAL is a colour burst TV crystal (f = 3.5795MHz) for the oscillator. The oscillator
frequency is divided down to 1.7897MHz on-chip and supplies the A/D converters
and the digital circuitry.
10. Demonstration Software
Serial communication with the SA9110A device is identical to the communication
found on the Single Phase family member, SA9109A. For this reason the
demonstration software for the Single Phase Application circuit is used for the Three
Phase Application.
The software package which accompanies the demonstration unit requires an IBM
or compatible PC with MS-DOS installed. This software, supplied on a 1.44M 3½"
disk, will allow the user to read and write settings from/to the demonstration unit.
Ensure that the communication connectors are in place prior to start.
Insert the diskette into the drive and at the DOS prompt, type
A:SA9109 [enter]
Context sensitive help screen for each input field or command prompt are available
by invoking [alt] H or [F1] key.
An introduction is available by pressing the [F1] key immediately after installation.
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PM9110BF
Figure 1: Connection Diagram
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DR-01105
POWER
_
BAT. +
CT3
CT2
CT1
R23
VSS
MAINS
D1
C12
C13
C16
R3B
R2B
R2A
R3A
R1B
R1A
C15
R4
P5
VSS
C14
AGND
VD D
R5
R20
R19
D2
R22
R21
C3
C2
C1
R18
R6
P6
R7
R13
R12
R11
R10
R9
R8
R17
R16
R15
38
37
2
3
12
25
1
32
31
30
29
28
27
6
7
8
R29
VBA
V SS
V SS
VREF
GND
V DD
V DD
IIP3
IIN3
IIP2
IIN2
IIP1
IIN1
IVP3
IVP2
12
R28
J10
IVP1
11
U2
5
13
R27
J9
3
C9
15
1
16
2
Q1
10
8
9
7
X
19
SCROLL
2
IC-1
C10
14
15
C5
20
21
1
5
X
C11
5
4
CIN3
CIP3
CINP
CIPP
CONP
COPP
OSCO
OSCI
COFF
R[3]
R[2]
R[1]
R[0]
S[13]
S[12]
S[11]
S[10]
S[9]
S[8]
S[7]
S[6]
S[5]
S[4]
S[3]
S[2]
S[1]
S[0]
RED_LED
IR_LED
X X X X X X X
SA9110AFA
C4
18
16
J8
14
4
17
6
COP1
64
PGM
65
PDTA
CON1
62
COP2
RESET
6
SK2
CON3
VSS
CIN2
66
PB
CIN1
4
COP3
63
PCLK
CIP1
68
67
CON2
23
22
36
35
34
33
59
60
43
42
41
40
39
58
57
56
55
54
53
52
51
50
49
48
47
46
45
R26
R25
R24
U3
TAR
TAR
C6
C8
C7
XTAL
J7
J6
J5
VSS
VD D
T1 COST
T2 TOTAL
T3 COM
T4 COST
.
.
.
T1
.
.
32
9
10
11
13
24
26
44
61
SD0
SR[1]
SR[0]
NC9
NC10
NC11
NC13
NC24
NC26
NC44
NC61
CIP2
36
35
1
2
34
33
3
4
.
.
T3
.
T2
.
30
29
7
8
9
31
5
6
28
27
10
.
.
26
11
T4
.
.
.
Total
.
23
22
14
15
25
24
12
13
.
J3
% Error
imp/kWh
Hz 321
kWsh
Wh/imp
21
20
19
J1
17
18
sames
16
SK1
J2
LCD
J4
PM9110BF
Figure 2: Application Circuit.
9/14
PM9110BF
Parts List for Application circuit: Figure 2
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
10/14
Symbol
U1
U2
U3
XTAL
R1A
R1B
R2A
R2B
R3A
R3B
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
P5
P6
C1
C2
C3
C4
C5
C6
Description
SA9110AFA
ILQ74 (Quad opto-coupler)
4N35 (opto-coupler)
Crystal 3.5795MHz
Resistor, 1%, ¼W, metal
Resistor, 1%, ¼W, metal
Resistor, 1%, ¼W, metal
Resistor, 1%, ¼W, metal
Resistor, 1%, ¼W, metal
Resistor, 1%, ¼W, metal
Resistor, 24k, 1%, ¼W, metal
Resistor, 22k, 1%, ¼W, metal
Resistor, 22k, 1%, ¼W, metal
Resistor, 24k, 1%, ¼W, metal
Resistor, 2.7k, 1%, ¼W, metal
Resistor, 2.7k, 1%, ¼W, metal
Resistor, 2.7k, 1%, ¼W, metal
Resistor, 2.7k, 1%, ¼W, metal
Resistor, 2.7k, 1%, ¼W, metal
Resistor, 2.7k, 1%, ¼W, metal
Resistor, 1M, 1%, ¼W, metal
Resistor, 1M, 1%, ¼W, metal
Resistor, 1M, 1%, ¼W, metal
Resistor, 2.7Ω, 1%, ¼W, metal
Resistor, 2.7Ω, 1%, ¼W, metal
Resistor, 2.7Ω, 1%, ¼W, metal
Resistor, 820Ω, 1%, ¼W, metal
Resistor, 820Ω, 1%, ¼W, metal
Resistor, 2MΩ, 1%, ¼W, metal
Resistor, 680Ω, 1%, ¼W, metal
Resistor, 2.2kΩ, 1%, ¼W, metal
Resistor, 2.2kΩ, 1%, ¼W, metal
Resistor, 2.2kΩ, 1%, ¼W, metal
Resistor, 2.2kΩ, 1%, ¼W, metal
Resistor, 2.2kΩ, 1%, ¼W, metal
Potentiometer, 4.7kΩ
Potentiometer, 4.7kΩ
Capacitor, electrolytic, 1µF, 16V
Capacitor, electrolytic, 1µF, 16V
Capacitor, electrolytic, 1µF, 16V
Capacitor, ceramic, 3.3nF
Capacitor, ceramic, 3.3nF
Capacitor, ceramic, 3.3nF
sames
Detail
PLCC-68
DIP-16
DIP-6
Colour burst TV
Note 4
Note 4
Note 4
Note 4
Note 4
Note 4
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Multi turn
Multi turn
Note 2
Note 2
Note 2
PM9110BF
Parts List for Application circuit: Figure 2 (continued)
Item Symbol
44
C7
45
C8
46
C9
47
C10
48
C11
49
C12
50
C13
51
C14
52
C15
53
C16
54
BAT
55
IR LED
56 RED LED
57
Q1
58
D1
59
D2
60 SCROLL
61
RESET
62
TARIFF
63
LCD
Description
Capacitor, ceramic, 2.2nF
Capacitor, ceramic, 3.3nF
Capacitor, ceramic, 560pF
Capacitor, ceramic, 560pF
Capacitor, ceramic, 560pF
Capacitor, 100µF, 16V
Capacitor, 100nF
Capacitor, 100nF
Capacitor, 100µF, 16V
Capacitor, 820nF
Battery, 1.2V
Infrared light emitting diode
Red light emitting diode
Photo transistor
Diode, 1N4148
Diode, 1N4148
NO, push button
NO, push button
DIP switch, 2 pole
OEL-7678*
Detail
Note 3
Note 3
Note 1: Resistor (R8, R9, R10, R11, R12 and R13) values are dependant upon the selected
values of the current transformer termination resistors R18, R19 and R20
Note 2: Capacitor values may be selected to compensate for phase errors caused by
the current transformers
Note 3: Capacitor (C13) to be positioned as close to Supply Pins (VDD & VSS) of IC-1, as
possible
Note 4: See the table below detailing the component values for the selected voltage
standard
*The LCD display is available from:
JEBON CORPORATION
Unit 709, Poongsan Factoria Town,
1141-2, Baegsok-Dong, Ilsan-District,
Koyangcity, Kyonggi-Do, 411-360, Korea
Tel: +82-31-902-9161 (12 lines)
Fax: +82-31-902-7775/7776
Web site: http://www.jebon.com
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PM9110BF
Item
Symbol
5
6
7
8
9
10
R1A
R1B
R2A
R2B
R3A
R3B
Description
PM9110BFE
PM9110BFA
230V
115V
200kΩ
120k Ω
180kΩ
82kΩ
200kΩ
120k Ω
180kΩ
82kΩ
200kΩ
120k Ω
180kΩ
82kΩ
ORDERING INFORMATION
Part Number
Description
PM9110BFA
3 X 115V, 3 X 80A Module
PM9110BFE
3 X 230V, 3 X 80A Module
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Detail
PM9110BF
Notes:
sames
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PM9110BF
Disclaimer:
The information contained in this document is confidential and proprietary to South African MicroElectronic Systems (Pty) Ltd ("SAMES") and may not be copied or disclosed to a third party, in whole or in part,
without the express written consent of SAMES. The information contained herein is current as of the date of
publication; however, delivery of this document shall not under any circumstances create any implication that the
information contained herein is correct as of any time subsequent to such date. SAMES does not undertake to inform
any recipient of this document of any changes in the information contained herein, and SAMES expressly reserves
the right to make changes in such information, without notification,even if such changes would render information
contained herein inaccurate or incomplete. SAMES makes no representation or warranty that any circuit designed
by reference to the information contained herein, will function without errors and as intended by the designer.
Any Sales or technical questions may be posted to our e-mail address below:
[email protected]
For the latest updates on datasheets, please visit out web site:
http://www.sames.co.za
South African Micro-Electronic Systems (Pty) Ltd
P O Box 15888,
33 Eland Street,
Lynn East, 0039
Koedoespoort Industrial Area,
Republic of South Africa,
Pretoria,
Republic of South Africa
Tel:
Fax:
14/14
012 333-6021
012 333-8071
sames
Tel:
Fax:
Int +27 12 333-6021
Int +27 12 333-8071