PM2002DP SAMES | Alldatasheet
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THE SA2002D PIN PROGRAMMABLE MONOCHIP METER This application note describes the functionality of the SA2002D metering integrated circuit using the PM2002DP evaluation module. The SA2002 enables the meter manufacturer to build a meter that measures the energy consumption, and records it to a mechanical counter. Energy flow direction as well as energy metering activity is indicated by means of LEDs. This application note will focus on the practical use of the SA2002D, more detailed information specific to the SA2002D can be found in the applicable datasheet. samessames Application Note: Energy Meter Evaluation Module PM2002DP 1/10SPEC-0088 (REV. 1) 08-11-00 Setting 6A / 220V 10A / 220V 20A / 220V 30A / 220V 40A / 220V 60A / 220V 80A / 220V Pin Status R0 = 0, R1 = 0, R2 = 1 R0 = 0, R1 = 0, R2 = 0 R0 = 1, R1 = 0, R2 = 0 R0 = 1, R1 = 0, R2 = 1 R0 = 0, R1 = 1, R2 = 0 R0 = 0, R1 = 1, R2 = 1 R0 = 1, R1 = 1, R2 = 0 Calibrated LED imp/kWh 6400 6400 3200 3200 1600 1600 800 CONNECTORS ON MODULE The PM2002DP module connects directly to live and neutral on SCK1. The module is referenced to live and should be kept in mind when connecting test equipment to the module. The current is measured by the shunt on the top of the PCB. The left terminal of the shunt is connected to live. The live out will be connected to the right terminal of the shunt. Table 1: A summary of the pin settings possible with the SA2002D. Pin status 0 indicates connection to VSS and 1 indicates connection to VDD. Name SCK1 JP2 JP3 Function Description Mains connector for module power and voltage sense Optional current transformer connector. (Underneath shunt resistor) Optional Stepper motor connector. (Remove jumper J6 to disconnect impulse counter) Table 2: Connector descriptions Live In Neutral Live Out Figure 1: Connection and jumper settings for 80A / 220V bi-directional meter module
2/10http://www.sames.co.za MODULE SETUP The PM2002DP module is setup for use with the SA2002D integrated circuit. Resistor values used on the module are calculated for rated conditions of 80A/220V. IIN IIP Vref FAST Vdd CNF NC AGND IVP DIRI DIRO NC MON Vss LED MOP NC P10 P17 P16 P15 P14 P13 P12 P11 P18 Vdd Vss J15 Vdd Vss J14 Vdd Vss J13 Vdd Vss J12 Vdd Vss J11 Vdd Vss JP3 Vss J6 6 5 4 3 2 1 . 1 SA2002D Figure 2: Jumper schematic, digital IO’s Name Function Description J1 J1 is used to select the energy direction ( DIRI pin). The three options available are: P18 connected to Vdd - Negative energy measurement P18 connected to Vss - Positive energy measurement P18 connected to J2 (P17) - Bi-directional energy measurement P18 should not be left floating and must be connected to one of the options described above. J2 J2 is only used to select bi-directional energy measurement when connected to P18 J3 and J4 These are test points placed next to the digital pins of the SA2002E J5 Not fitted This is the current sense input ground. If a current transformer is used for current sensing the two pins of J5 must be connected. J6 Connects the impulse to VSS. If a stepper motor is connected to JP3 then J6 should be left open. J7 Analog ground test point (see figure 1) J8 Positive supply test point (Vdd) (see figure 1) J9 Negative supply test point (Vss) (see figure 1) J11, J12 and J13 Used to select the R2, R1 and R0 pins of the SA2002D for the various rated conditions. Refer to table 1 for the possible settings J14 Used to select fast calibration mode. Connecting P7 to Vdd selects fast calibration mode. For normal operation P7 must be connected to Vss J15 Used to select between normal and configure / test modes. For normal operation connect P9 to Vss. J16 Used to select between 220V and 110V mains systems (See figure 3). Leave open for 220V mains. Table 3: Jumper settings for various device options
4/10http://www.sames.co.za CT TERMINATION RESISTOR Provision is made for the use of a current transformer on the module. The existing shunt needs to be removed and the current sense resistors will have to be recalculated for the specific current transformer. The voltage drop across the CT termination resistor at rated current should be at least 20mV. The CT's used should have a low phase shift and a ratio of 1:2500.The CT is terminated with a 2.7 W resistor giving a voltage drop of 864mV across the termination resistor at rated conditions CURRENT SENSOR INPUT RESISTORS FIGURE 5 (USING A CURRENT TRANSFORMER) The resistors R6, R7 define the current level into the current sense inputs the device. The resistor values are selected for an input current of 16µA on the current inputs at rated conditions. For an 80A-rated meter the resistor values are calculated as follows: R6 = R7 = (I/ 16µA) x R / 2L SH = 80A / 16µA x 2.7W / 2 = 2.7kW I Line current L = RSH = CT Termination resistor 2500 = CT ratio Figure 5: Current input configuration LIVE IN LIVE OUT R16 IIN IIP J5L CT1 R6 Phase Compensation (When using a current transformer) Phase shift caused by the current transformer may be corrected by inserting a capacitor in the voltage divider circuit. See Figure 6, Capacitor C7. 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 1M x tan( 0.18 degrees)) C = 1.013µF Reference Voltage VREF The VREF pin of the SA2002D is connected to a resistor that determines the on chip bias current. Ground GND The GND pin of the SA2002D is to the live 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.
Diode, Silicon, 1N4007 Resistor, 47k, 1/4W, 1%, metal Resistor, 150k, 1/4W, 1%, metal Resistor, 100R, 1/4W, 1%, metal Resistor, 1.6k, 1/4W, 1%, metal Resistor, 2.4k, 1/4W, 1%, metal Resistor, 47R, 2W, 5%, wire wound Resistor, 22k, 1/4W, 1%, metal Resistor, 1M, 1/4W, 1%, metal Resistor, 24k, 1/4W, 1%, metal Shunt resistor, 80A / 50mV Resistor, 1/4W, 1%, metal Capacitor, 220nF Capacitor, 220nF, 16V, electrolytic Capacitor, 470nF, 250VAC Capacitor, 820nF Capacitor Capacitor, 2200uF, 16V, electrolytic 3mm Light emitting diode Impulse counter, Kuebler, K07.80 Molex 3 pin connector, 200mil pin spacing Molex 2 pin connector, 100mil pin spacing Jumpers Header pins D1, D2 R1, R3 DIP-20 R2, R15 R4, R5 R6, R7 R8, R9 R10 R11 R12 R13 R14 R16 C1, C2 C3, C4 LED1, LED2 CNT1 SCK1 JP3 http://www.sames.co.za COMPONENT LISTS The following component list covers all components fitted on the PM2002DP module as shipped Diode, Zener, 2.4VD3, D4 Resistor, 1/4W, 1%, metal Note 1 Note 1 Note 2 Note1: In case a current transformer is used on the board R16 is the termination resistor. Resistors R6 and R7 values may need to be changed to match the CT used. Note2: Capacitor values may be selected to compensate for phase errors caused by current transformers. Table 4: Components for PM200DP module set up for 220V/80A
6/10http://www.sames.co.za Figure 6: Schematic diagram of the complete PM2002DP module + C3 C2 R1 R2 R3 + C4 C5R10 R11 R12 R13 LIVE IN NEUTRAL LIVE OUT NEUTRAL B A SB SA R14 R24 R15 FAST7 R06 VDD8 CNF9 VREF3 IIP2 IIN1 GND 20 IVP 19 DIRI 18 DIRO 17 MON 15 VSS 14 LED 13 MOP 12 .1123456 CNT1 SCK1 J11 J12 J13 J14 VSS VSS VSS VSS VDD VDD VDD VDD J2VDD VSSP4 P10 P11 P12 P13 P15 P16 P17 P18 IIN IIP N L LO LED1 LED2 J15 VDD MM R15 J16 JP3 + C8 NC NC NC
8/10http://www.sames.co.za Figure 9: Silkscreen of the PM2002D module
samessamesPM9607AP samessamesPM2002DP 9/10http://www.sames.co.za NOTE:
10/10http://www.sames.co.za samessamesPM9607AP samessamesPM2002DP DISCLAIMER: The information contained in this document is confidential and proprietary to South African Micro-Electronic 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: energy@sames.co.za For the latest updates on datasheets, please visit our web site: http://www.sames.co.za. SOUTH AFRICAN MICRO-ELECTRONIC SYSTEMS DIVISION OF LABAT TECHNOLOGIES (PTY) LTD Tel: (012) 333-6021 Tel: Int +27 12 333-6021 Fax: (012) 333-8071 Fax: Int +27 12 333-8071 P O BOX 15888
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