Watlow CLS200 - Table 5.3 - Application Example: Setting up Ratio Control

CLS200 Series User’s Guide
Chapter 5: Enhanced Features
111
Table 5.3 — Application Example: Setting Up Ratio Control
DISPLAY USER INPUT
ALARM
SETUP LOOP 02
RATIO CONTROL?
Press YES to set up the ratio control parameters or loop 02.
ALARM
02 RATIO CONTROL
MSTR LOOP? 01
Assign loop 01 as the master loop. Press ENTER.
ALARM
02 RATIO CONTROL
MIN SP? 0.0
Enter the minimum ratio loop setpoint. For this example, we
will use 0.0 gallons per second as a minimum. Press ENTER.
ALARM
02 RATIO CONTROL
MAX SP? 7.0
Enter the maximum ratio loop setpoint. For this example,
we will use 7.0 gallons per second as a maximum. Press
ENTER.
ALARM
02 RATIO CONTROL
CTRL RATIO? 0.5
Enter the control ratio, which is the multiple applied to the
master. The H
2
O flow rate is multiplied by 0.5 to obtain the
KOH flow rate setpoint. Press ENTER.
ALARM
02 RATIO CONTROL
SP DIFF.? 0
Enter the setpoint differential (or offset). For this example we
have no offset requirement and will use 0. Press ENTER.
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.