Chapter 6. PROGRAMMING

10.2.2A Program for Control Using a RTD

(with Applying the RTD Input Module, PID Control Module and D/A Conversion Module)

1)System Configuration

K7S-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K7P-

 

K7X-

 

K7X-

 

K7F-

 

 

K7F-

 

 

K7F-

 

 

K7S-

K7Y-

122S

 

30AS

 

310S

 

210S

 

RD3A

 

 

PIDA

 

 

AD4A

 

 

132S

 

301S

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ch. 0

Loop 0

Ch. 0

 

 

 

 

 

Power conversion device

RTD

2)Initial Settings

(1)PID control module

A)Specifying used loop : loop 0

B)Specifying forward/reverse action: forward action

C)Specifying the Set Value: 8000

D)Specifying auto/manual processing : auto processing

(2)RTD input module

A)Specifying used channel: channel 0

B)Specifying RTD sensor type: Pt100

(3)D/A conversion module

A) Setting the voltage input range to –5 to 5 DCV (offset: DC 1V, gain: DC 3V)

B)Specifying used channel : channel 0

C)Specifying input data type : 0 to 16000

3)Descriptions of the Program

(1)The channel 0 of the RTD input module detects a temperature of the electric furnace through Pt100 and receives it as a digital value.

(2)The Set Value of PID control module loop 0 is set to 8000(where the temperature is 100° C). With regards to P.I.D constants, the manipulated value in the BCD digital switch is set to the proportional constant when P0022 turns on, to the integral constant when P0023 turns on, and to the Derivative constant when P0023 turns on. As the change of MV, the manipulated value in the BCD digital switch is set to a new MV.

(3)MV, the result from PID processing is output at the channel 0 of the D/A conversion module.

(4)If P0021 turns on, PV is displayed on the BCD digital LED.

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LG Electronics K7F-PIDA, K4F-PIDA manual RD3A Pida AD4A

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