Watlow CLS200 - Manual (Page 138)

Chapter 6: Enhanced Features CLS200 Series User’s Guide
122 Watlow Anafaze Doc.# 0600-3050-2000
To set up this application, you would do the following:
1. Change the display to loop 2, which will be the second-
ary loop, and then enter the three-key sequence (
EN-
TER, then ALARM ACK, then CHNG SP) and go to the first
screen in Table 6.2.
2. Follow the steps in Table 6.2 to configure cascade control.
Table 6.2 Application Example: Setting Up
Cascade Control
Display User Input
Press YES to set up the cascade parameters with loop 2 as the sec-
ondary loop.
Enter 01 to make loop 1 the primary loop. Press ENTER.
The base setpoint corresponds to the 0% level output of the primary
loop. Enter the base setpoint of the secondary loop. For this exam-
ple, we will assume a base setpoint of 150° F, which is the desired
water temperature. Press ENTER.
Enter the minimum setpoint of the secondary loop. For this example,
we will use a minimum setpoint of -350° F. Press ENTER.
Enter the maximum setpoint of the secondary loop. For this exam-
ple, we will use a maximum setpoint of 1400° F. Press ENTER.
Enter the heat span of the secondary loop. This is the span over
which the primary output from 0 to 100% is used to change the set-
point. The desired setpoint range is 150 to 190° F. We will assume
a linear rise in setpoint, so the heat span is 40° F. Press ENTER.
Enter the cool span of the secondary loop. For this example we will
assume no low-side adjustment to the setpoint, so the cool span is
0° F. Press ENTER.
ALARM
SETUP LOOP 02
CASCADE?
ALARM
02 CASCADE
PRIM. LOOP? 01
ALARM
02 CASCADE
BASE SP? 150
ALARM
02 CASCADE
MIN SP? -350
ALARM
02 CASCADE
MAX SP? 1400
ALARM
02 CASCADE
HT SPAN? 40
ALARM
02 CASCADE
CL SPAN? 0