Deni 5300 Especificações descarregar pdf (Página 19)

5 - CT/PT Installation5 - CT/PT Installation

5 - CT/PT Installation

External current and potential transformers can be used

to extend the measuring ranges of the PA. See Section

4, Figure 6 for a connection diagram.

CALIBRATION

The 5300 has special provisions allowing entry of

transformer ratios into the non-volatile RAM via the

GPIB (IEEE-488) rear panel input. The PA display

then includes the transformer ratios and reads actual

current, voltage and power directly.

CT/PT DETECTION

At power turn on initialization, the MPU interrogates

that portion of memory where the CT and PT

compensation values reside. If a value is found, the MPU

looks to see if the rear panel CT/PT slide switch (see

Figure 12) is set to the "IN" position (to include the

transformer ratios). If it is, normal calibration factors

are revised by applying the transformer factors. The

displays indicate actual load values.

Figure 12. Current & Potential Transformer Selections

OUT

GND

EXT

CT/PT

Since the above interrogation and scale factor setup

occurs only at power turn on, the scale factors are active

until power is turned off, the CP/PT switch turned to

"OUT" and power turned "ON." The CP/PT factors

are now removed and the standard factory calibration

factors become active.

CT/PT RATIO RANGE

The 5300 PA compensates all display values for

transformer ratios from 0.01 to 255.

DIGITAL RANGE

The digital display holds four digits for AMPS and

VOLTS, and five digits for WATTS or KW. When a

value exceeds these limits, the decimal point is turned

off. This is a warning that the compensated value is

above the display capability and is in error. If this should

occur during GPIB use, an exclamation mark is

substituted immediately to the right of the least

significant digit (i.e. !=ASCII033) to signal that there

is an unknown magnitude.

GPIB-CT/PT PROGRAMMING

The 5300 PA accepts either upper or lower case

characters, and whole numbers in any numerical format.

For CT installation: CTnnncl

For PT installation: PTnnncl

Where: nnn=0.01 to 255.

("cl" denotes a carriage return/line feed termination

character.)

For example:

A CT with 250:1 ratio is: CT250.cl

A PT with 10:1 ratio is: PT10.0ct

The PA will ignore any value outside of the range of

0.01 to 255. If an out of range entry is attempted, the

display will warn by showing "HELP." Correct and re-

enter your factor.

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