Watlow CPC400 - Manual (Page 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 5V Î (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 5V
Î (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 5V Î (dc) input signal is a process input.
Input Input range high 300˚F The 5V Î (dc) input signal represents 300°F.
Input Input high signal 100.0%
The controller is equipped with a 0 to 5V Î (dc)
input, and the input signal is 0 to 5V Î (dc), so the
signal covers the full scale of 0 to 100 percent.
Input Input range low 0˚F The 0V Î (dc) input signal represents 0°F.
Input Input low signal 0.0%
The controller is equipped with a 0 to 5V Î (dc)
input, and the input signal is 0 to 5V Î (dc), so the
signal covers the full scale of 0 to 100 percent.