Watlow CPC400 Manual de usuario descargar pdf (Pagina 91)

CPC400 Series User’s Guide Chapter 3: Operation and Setup

Doc. 0600-2900-2000 Watlow Anafaze 77

How to Set Up a Remote Analog Set Point

1. For the master loop (the loop that accepts the input

signal from the external device), set the parameters in

the Input menu.

2. For the ratio loop (the one whose set point is controlled

by the external device), set the parameters in the Ra-

tio menu. Specify the loop that accepts the input signal

as the master loop.

Remote Analog Set Point Example: Changing a Set Point with a PLC

A PLC provides a 0 to 5VÎ (dc) signal representing 0 to

300°F as a remote set point input to the CPC400. The input

signal is received on loop 1, and control is performed on loop

2. The CPC400 is equipped with the proper scaling resis-

tors to allow it to accept a 0 to 5VÎ (dc) input.

Table 3.14 and Table 3.15 show the parameter settings for

this application.

Table 3.14 Parameters Settings for the Master

Loop (Loop 1) in the Example

Menu Parameter Value Comment

Input Input type process A 0 to 5VÎ (dc) input signal is a process input.

Input Input range high 300˚F The 5VÎ (dc) input signal represents 300°F.

Input Input high signal 100.0%

The controller is equipped with a 0 to 5VÎ (dc)

input, and the input signal is 0 to 5VÎ (dc), so the

signal covers the full scale of 0 to 100 percent.

Input Input range low 0˚F The 0VÎ (dc) input signal represents 0°F.

Input Input low signal 0.0%

The controller is equipped with a 0 to 5VÎ (dc)

input, and the input signal is 0 to 5VÎ (dc), so the

signal covers the full scale of 0 to 100 percent.

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Watlow CPC400 Manual de usuario Pagina 91