DIGITECH WORLD GOING ON.......: August 2015

Monday, August 17, 2015

SCL INSTRUCTION

FOR ANALOG INPUT:-

In case of Micrologix -1000 A for current signal (4 to 20 mA),

Max Value for i/p = 31230 (Approx.)

So min value at 4 mA = 31230*4/20 = 6246 (Approx.)

Let the range of RTD is 0 to 400 degree C.

To calculate the value of rate & offset please use following formula.

1). Rate = (scaled max. - scaled min.) * 10000 / (input max. - input min.)

= (400 – 0) * 10000 / (31230-6246)

Rate = 160

2). Offset = scaled minimum - (input minimum x rate)

= 0 – (6246 * .0160)

Offset = -100

FOR ANALOG OUTPUT

In case of Micrologix -1000 A for current signal (4 to 20 mA),

To use the AI double click on I/O Configuration & then I/O Setup.

Select the o/p mode (may be current or voltage, which you want to use).

If you want to provide 0 to 10 V signal on o/p then the value at O:0.4 should be 0 to 31230 (Approx.).

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Abb positioner manual checking and opening of control valve:

A.Press Mode key for 3 sec untill parameter

1.3 MAN_SENS

then release the Mode key

B.now showing SENS_POS which is -25 degree or any other reading.this is zero or 0 % close postion of the control valve.

C.For 100% opening press both keys: 1^st up errow key with 2^nd errow dowen key untill valve not open 100 %.then release the both key.

Note: alwayes keep the control valve at zero position befor exit SENS_POS parameter.

Abb positioner Auto caliberation of control valve:

A.Press Mode key for 5 sec untill parameter

ADJ_LIN

then release the Mode key

B.auto caliberation working 10 to 100 % Run

c. end of caliberation .