Deni 5300 Especificações descarregar pdf (Página 23)

Magtrol Model 5300 Three Phase Power Analyzer

Chapter 7 - Instruction Set

This string transmits volts, watts and amps. To get line

voltage, power factor (PF) or kilowatts (KW), the host

computer must make the following calculations:

W W W

E I E I E I

+ +

∅ ∅ ∅

∅ ∅ ∅ ∅ ∅ ∅

1 2 3

1 1 2 2 3 3

E E

LINE n PHASE n

( ) ( )

(Where “n” is the phase number)

W W W

+ +

1 2 3

1000

DATA RATE

The OPEN and SYNC commands affect bus timing.

Selection is dependent upon what other instruments are

on the bus, their acquisition rate, and how you wish to

process the data.

“OPEN” INSTRUCTION

If your data acquisition is random, or you don't want to

wait for the full 0.1 second data sampling rate, you can

use the OPEN instruction. Data output is nearly

immediate, depending upon the MPU status at the time

of request. If multiple data

requests are made within the MPU's 0.1 second sample

rate, you will receive multiple transmissions of the same

data. If your program is accumulating data in an array,

you will want to include a routine to ignore the second

of any two identical received data words.

INSTRUCTION

The host PC will be held by the 5300 PA until the

sampling period is over. In this mode, data will always

be the result of the most recent sampling period.

However, if you are using a Magtrol controller like the

Model 4629B or 5240, the two instruments should be

synchronized to avoid a timing conflict. This

synchronization is done as follows:

Output any instruction (except "RES") to each

of the instruments without including the

combination carriage return/line feed (oo)

terminating instruction. Now, both instruments

are "hung up" at fixed program locations

waiting for the carriage return/line feed

instruction. Synchronization is accomplished by

restarting both programs by outputting only the

carriage return/line feed instruction (oo) in

successive statements to both instruments.

At restarting, the instrument will be synchronized, but

will slowly drift apart and require re-synchronization.

If you are acquiring data in batches, execute the above

synchronization routine just prior to each data input

routine.

PROGRAMMING EXAMPLE

The following program sets the 5300 PA in the "SYNC"

mode with "FULL" data format. The CRT monitor

displays:

Amperes - summed for total 3-phase line.

Voltage - average 3-phase line.

Power - 3-phase kilowatts.

This example (on the following page) assumes that the

National GPI-PC interface hardware and Microsoft

Quick Basic are used.

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