PM9110BFA Ver la hoja de datos (PDF) - South African Micro Electronic Systems

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Fabricante

PM9110BFA

MONOCHIP THREE PHASE BIDIRECTIONAL KILOWATT HOUR METERING MODULE

South African Micro Electronic Systems 

PM9110BF

The values of these resistors should be calculated as follows:

Phase 1:

R8 = R9 = (IL1/16mA) * R18/2

Phase 2:

R10 = R11 = (IL2/16mA) * R19/2

Phase 3:

R12 = R13 = (IL3/16mA) * 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

C1, C2 and C3 are for decoupling and

1p4hmasAeRMcSofmorpreantseadtiloinne.

voltage.

Capacitors

Rco7nddietifoinnessaarell

on-chip bias and

set. Any changes

reference currents.

to R7 will affect the

With

output

qRu7a=dr2a4tikcΩal,lyo(pi.teim: u∆mR

= +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.

sames

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