Watlow CPC400 - Manual (Page 68)

Chapter 3: Operation and Setup CPC400 Series User’s Guide
54 Watlow Anafaze Doc. 0600-2900-2000
Changing the Set Point
How to Manually Change the Set Point
Start at the loop display and follow these steps:
1. Press p to choose the appropriate loop.
2. Press .. The Set point parameter should appear. If
nothing happens, the keypad may be locked; see Key-
pad Lock on page 101. Also, the Set point parameter is
not available if cascade control or ratio control is en-
abled on the loop.
3. Press > or < to adjust the set point value.
4. Press , to save the value and return to the loop dis-
play, or press p to save the value and switch to the
set point for another loop, or press x to cancel chang-
es.
5. On the loop display, the new set point value is shown
on the second line.
Other Methods of Changing the Set Point
You can use other methods to change the set point:
• Cascade Control: Use the output of one loop to ad-
just the set point of another loop. See Setting Up Cas-
cade Control on page 69.
• Ratio Control: Use the process variable of one loop,
multiplied by a ratio, as the set point of another loop.
See Setting Up Ratio Control on page 73.
• Differential Control: Use the process variable of one
loop, plus an offset value, as the set point of another
loop. See Setting Up Differential Control on page 75.
• Remote Analog Set Point: Use an external device
such as a PLC to control the set point. See Setting Up
Remote Analog Set Point on page 76.
• Serial Communications: Use a computer program
or operator interface panel to change the set point. See
the Appendix: Modbus RTU.
• Logic Program: Use a LogicPro logic program to con-
trol the set point. The logic program overrides set
point values that are set by other means. See the Log-
icPro User’s Guide.
01 925 ˚Cc 0
1000manh100
Set Point