WEG CFW700, Programming And Troubleshooting Manual

Page: 192 / 223

19
Applications
19-2 | CFW700
Definitions:
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The Function 1 of the Application at parameters P0231 or P0236 represents the value of the PID Setpoint.
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The Function 2 of the Application at parameters P0231 or P0236 represents the value of the PID Feedback.
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The Function 1 of the Application at parameters P0251 or P0254 represents the value of the PID Setpoint.
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The Function 2 of the Application at parameters P0251 or P0254 represents the value of the PID Feedback.
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The Function 1 of the Application at parameters P0263 to P0270 represents the value of the Manual/Auto
command.
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The Function 1 of the Application at parameters P0275 to P0279 represents the VP>VPx logical condition.
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The Function 2 of the Application at parameters P0275 to P0279 represents the VP<VPy logical condition.
The PID setpoint can receive an analog input signal (AI1 or AI2). It is necessary to set P1016 to 1 = AIx and select
which analog input will be used. The analog inputs are set at P0231 (AI1) or P0236 (AI2) and it is necessary to program
it to 5 = Function 1 of the Application in order to enable the analog inputs for the operation. The following alarm
message will be displayed in case it is not properly done: “A770: Set AI1 or AI2 for Function 1 of the Application”.
The PID setpoint value can be presented via analog output AO1 or AO2. It is necessary to set P0251 (AO1) or
P0254 (AO2) to 17 = Function 1 of the Application. The full scale value of the variable is 100.0 % and corresponds
to 10 V or 20 mA.
The PID feedback can receive an analog input signal (AI1 or AI2). It is necessary to set P0231 (AI1) or P0236 (AI2)
to 6 = Function 2 of the Application in order to enable the analog inputs for the operation. The following alarm
message will be displayed in case it is not properly done: “A772: Set AI1 or AI2 for Function 2 of the Application”.
In case the analog inputs (AI1 and AI2) are programmed with the same function, PID Setpoint or Feedback, the
following alarm message will be displayed and the application will not be enabled: “A774: AI1 and AI2 were set
for the same function”.
The value of the PID feedback can be presented via analog output AO1 or AO2. It is necessary to set P0251
(AO1) or P0254 (AO2) to 18 = Function 2 of the Application. The full scale value of the variable is 100.0 % and
corresponds to 10 V or 20 mA.
The Manual/Auto control is done by a digital input (DI1 to DI8). It is necessary to set one of the DI parameters
(P0263 to P0270) to 20 = Function 1 of the Application. If more than one digital input is set for this
function, the logic operation will consider only the command of the high priority level digital input, where:
DI1>DI2>DI3>DI4>DI5> DI6>DI7>DI8. If any of the digital inputs is set, the PID controller will work only in
automatic (Auto) mode.
The Manual/Auto input is active when it is in 24 V indicating automatic control and it is inactive in 0 V indicating
manual operation.
The digital outputs (DO1 to DO5) can be programmed to trigger comparison logics with the process variable (PV).
In order to do that, it is necessary to set one of the DO’s parameters (P0275 to P0279) to 34 = Function 1 of the
Application (VP>VPx) or 35 = Function 2 of the Application (VP<VPy).