Watlow CLS200 - Manual (Page 144)

Chapter 6: Enhanced Features CLS200 Series User’s Guide
128 Watlow Anafaze Doc.# 0600-3050-2000
Table 6.3 Application Example: Setting Up
Ratio Control
4. Press
BACK several times until the normal loop display
appears. The setpoint of loop 2 will now be equal to one
half of the process variable of loop 2.
5. To complete the ratio setup, configure both loops 1 and
2 for inputs, outputs, and alarms. See Chapter 4, Setup
for information on loop setup.
Display User Input
Press YES to set up the ratio control parameters for loop 02.
Assign loop 01 as the master loop. Press ENTER.
Enter the minimum ratio loop setpoint. For this example, we will use
0.0
gallons per second as a minimum. Press ENTER.
Enter the maximum ratio loop setpoint. For this example, we will use
7.0
gallons per second as a maximum. Press ENTER.
Enter the control ratio, which is the multiple applied to the master.
The H
2
O fl w rate is multiplied by 0.5 to obtain the KOH fl w rate
setpoint. Press ENTER.
Enter the setpoint differential (or offset). For this example we have
no offset requirement and will use 0. Press ENTER.
ALARM
SETUP LOOP 02
RATIO CONTROL?
ALARM
02 RATIO CONTROL
MSTR LOOP? 01
ALARM
02 RATIO CONTROL
MIN SP? 0.0
ALARM
02 RATIO CONTROL
MAX SP? 7.0
ALARM
02 RATIO CONTROL
CTRL RATIO? 0.5
ALARM
02 RATIO CONTROL
SP DIFF.? 0