sames three phase power/energy metering module pulse output 1/10 4310 pds038-sa9105-001 rev. b 13-09-95 features n performs one, two or three phase power and energy measurement n meets the accuracy requirements for class 1 ac watt hour meters n operates over a wide temperature range n uses current transformers for current sensing n three pulse rate outputs available n protected agianst esd sa9105 application note PM9105AF description the sames three phase power/energy metering module, the PM9105AF provides three pulse rate output options, the frequency of which are proportional to the active power consumption. energy consumption can be determined by the power measurement being integrated over time. the method of calculation takes the power factor into account. the output of this innovative universal three phase power/energy metering circuit is ideally suited for energy calculations in applications using a -controller or mechanical counter. the application utilises the sames sa9105af, sa9105ef or sa9105ff three phase power metering integrated circuits for power measurement.
PM9105AF sames 2/10 block diagram absolute maximum ratings * parameter symbol min max unit supply voltage (note 1) v ac 540 v storage temperature t stg -25 +125 c operating temperature (note 2) t o -10 +70 c note 1: voltages are specified with reference to neutral. note 2: the sa9105 integrated circuit is specified to operate over the temperature range -10c to +70c. 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 operation sections of this specification, is not implied. exposure to absolute maximum ratings for extended periods may affect device reliability.
PM9105AF sames 3/10 electrical characteristics (over the temperature range -10c to +70c, unless otherwise specified. power consumption figures are applicable to the PM9105AFe only.) parameter symbol min typ max unit condition supply voltage (x3 phases) v ac 180 230 265 v PM9105AFe (continuous) 90 115 138 v PM9105AFa frequency output foutx refer to applicable ic data sheet power consumption 1 100 mw v dd = 5v note 1: power consumption specifications exclude power consumed by the current sensors. connection description designation description pl5 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) pl6 power output: 4hz at rated current power output: 290 hz at rated current power output: 1160 hz at rated current 0v (common) pl4 5v dc supply voltage 0v dc supply voltage ct1 phase 1 (direction indicated on pcb) ct2 phase 2 (direction indicated on pcb) ct3 phase 3 (direction indicated on pcb) functional description 1. power calculation in the application circuit (see figure 2), the output currents from the current sensors will be between 0 and 16a. the current input stages saturate at input currents greater than 18a rms . the mains voltage (mains voltage + 15% - 20%) is used for the power calculation, together with the current information from the current sensors (current transformers). the calculated power for the 3 phases is integrated over time and converted into a corresponding frequency.
PM9105AF sames 4/10 for rated conditions, the signals into the current and voltage sensor inputs are set as follows: current sensor input currents: 16 a rms voltage sensor input currents: 14 a rms under these conditions, the device generates a pulse rate of 1,16khz at output fout1. the output frequency at fout2 is fout1/4. at fout3 the output frequency is fout1/290. 2. electrostatic discharge (esd) protection the device's inputs/outputs are protected against esd according to mil-std 883c, method 3015. 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 500mw, excluding the current sensors. 4. isolation the reference for the unit is connected to neutral. 5. circuit description the module is supplied from an external 5v dc supply. the application circuit (figure 2), details the components required for a three phase power metering module. terminated current transformers are used as current sensors. the most important external components are: c 7 , c 9 , c 10 and c 11 are the outer loop capacitors for the integrated oversampling a/d converters. the typical value of c 7 is 2.2nf and the value of c 9 , c 10 and c 11 is 560pf. the actual values determine the signal to noise and stability performance. the tolerances should be within 10%. c 4 , c 5 , c 6 and c 8 are the inner loop capacitors for the integrated oversampling a/d converters. the typical value of c 4 , c 5 , c 6 and c 8 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 sa9105 through current setting resistors (r 8 ..r 13 ). the resistor values should be selected for an input current of 16 m a into the sa9105 at the rated line current.
PM9105AF sames 5/10 the values of these resistors should be calculated as follows: phase 1: r 8 = r 9 = (i l1 /16 m a) x r 18 /2 phase 2: r 10 = r 11 = (i l2 /16 m a) x r 19 /2 phase 3: r 12 = r 13 = (i l3 /16 m a) x r 20 /2 where i lx = secondary ct current at rated conditions. r 18 , r 19 and r 20 = termination resistors of the three current transformers. r 1 + r 1a , r 4 and r 15 set the current for the phase 1 voltage sense input. r 2 + r 2a , r 5 + p 5 and r 16 set the current for phase 2 and r 3 + r 3a , r 6 + p 6 and r 17 set the current for phase 3. the values should be selected so that the input currents into the voltage sense inputs (virtual ground) is set to 14 m a at nominal line voltage. capacitors c1, c2 and c3 are for decoupling and phase compensation. r 14 + p 14 defines all on-chip bias and reference currents. with r 14 + p 14 = 24k w , optimum conditions are set. p 14 may be varied within 10% for calibration purposes. any changes to r 14 will affect the output quadratically (i.e: d r = +5%, d fout = +10%). xtal is a colour burst tv crystal (f = 3.5795 mhz) for the oscillator. the oscillator frequency is divided down to 1.7897 mhz on-chip to supply the digital circuitry and the a/d converters.
PM9105AF sames 6/10 figure 1: connection diagram
PM9105AF sames 7/10 figure 2: application for three phase power/energy measurement. sa9105 plcc-44 ic-1 r11 ct2 2.5v ct3 5v 0v 2.5v r20 dr-00882 c8 xtal c12 29 28 30 33 32 r13 c7 r12 21 22 23 27 26 25 ct1 n r19 r18 0v mains voltages ph1 ph2 ph3 c5 c6 r9 r10 r8 15 16 19 18 17 20 c4 34 44 11 14 13 r3 r2 r1 r3a r2a r1a c11 c14 p14 ov 37 38 31 35 36 r14 42 43 39 40 41 1 0v 0v fout3 fout2 fout1 c13 5v p6 0v p5 0v r17 r16 r15 c10 7 6 3 4 5 2 c9 10 24 12 8 9 r6 c3 + c1 + c2 + r7 r5 r4 r21 2.5v 5v
PM9105AF sames 8/10 parts list for application circuit: figure 2 item symbol description detail 1 ic-1 sa9105af/sa9105ef plcc-44 2 xtal crystal, 3.5795 mhz tv crystal 3 r1 resistor, 1%, ?w, metal note 4 4 r1a resistor, 1%, ?w, metal note 4 5 r2 resistor, 1%, ?w, metal note 4 6 r2a resistor, 1%, ?w, metal note 4 7 r3 resistor, 1%, ?w, metal note 4 8 r3a resistor, 1%, ?w, metal note 4 9 r4 resistor, 24k, 1%, ?w, metal 10 r5 resistor, 22k, 1%, ?w, metal 11 r6 resistor, 22k, 1%, ?w, metal 12 r7 resistor, 820 w , 1%, ?w, metal 13 r8 resistor, 2.7k, 1%, ?w, metal note 1 14 r9 resistor, 2.7k, 1%, ?w, metal note 1 15 r10 resistor, 2.7k, 1%, ?w, metal note 1 16 r11 resistor, 2.7k, 1%, ?w, metal note 1 17 r12 resistor, 2.7k, 1%, ?w, metal note 1 18 r13 resistor, 2.7k, 1%, ?w, metal note 1 19 r14 resistor, 22k, 1%, ?w, metal 20 r15 resistor, 1m, 1%, ?w, metal 21 r16 resistor, 1m, 1%, ?w, metal 22 r17 resistor, 1m, 1%, ?w, metal 23 r18 resistor, 2.7 w , 1%, ?w, metal note 1 24 r19 resistor, 2.7 w , 1%, ?w, metal note 1 25 r20 resistor, 2.7 w , 1%, ?w, metal note 1 26 r21 resistor, 820 w , 1%, ?w, metal 27 p5 potentiometer, 4.7k multi turn 28 p6 potentiometer, 4.7k multi turn 29 p14 potentiometer, 4.7k multi turn 30 c1 capacitor, electrolytic, 1f, 16v note 2 31 c2 capacitor, electrolytic, 1f, 16v note 2 32 c3 capacitor, electrolytic, 1f, 16v note 2 33 c4 capacitor, ceramic, 3.3nf 34 c5 capacitor, ceramic, 3.3nf 35 c6 capacitor, ceramic, 3.3nf 36 c7 capacitor, ceramic, 2.2nf 37 c8 capacitor, ceramic, 3.3nf 38 c9 capacitor, ceramic, 560pf 39 c10 capacitor, ceramic, 560pf 40 c11 capacitor, ceramic, 560pf
PM9105AF sames 9/10 parts list for application circuit: figure 2 (continued) item symbol description detail 41 c12 capacitor, ceramic, 100nf 42 c13 capacitor, ceramic, 820nf note 3 43 c14 capacitor, ceramic, 100nf note 1: resistor (r 8 , r 9 , r 10 , r 11 , r 12 and r 13 ) values are dependant upon the selected values of the current transformer termination resistors r 18 , r 19 and r 20 . 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 (v dd & v ss ) of ic-1, as possible. note 4: see the table below detailing the component values for the selected voltage standard. item symbol description detail PM9105AFa PM9105AFe 115v 230v 3 r1 200k w 120k w 4 r1a 180k w 82k w 5 r2 200k w 120k w 6 r2a 180k w 82k w 7 r3 200k w 120k w 8 r3a 180k w 82k w ordering information part number description PM9105AFa 3 x 115v, 3 x 80a module PM9105AFe 3 x 230v, 3 x 80a module
PM9105AF sames 10/10 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 out web site: http://www.sames.co.za south african micro-electronic systems (pty) ltd p o box 15888, 33 eland street, lynn east, koedoespoort industrial area, 0039 pretoria, republic of south africa, republic of south africa tel: 012 333-6021 tel: int +27 12 333-6021 fax: 012 333-8071 fax: int +27 12 333-8071 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.
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