Setting Up And Tuning Pid Loops; Proportional Band (Pb) Settings; Integral Settings; Table 7.1 - Proportional Band Settings - Watlow CLS200 User Manual

CLS200 Series User's Guide
Chapter 7: Turning and Control

Setting Up and Tuning PID Loops

After installing your control system, tune each control loop and then set the loop to automatic
control. When tuning a loop, choose PID parameters that will best control the process. This section
gives PID values for a variety of heating and cooling applications.

Proportional Band (PB) Settings

Table 7.1 shows proportional band settings for various temperatures in degrees Fahrenheit or
Celsius.
Table 7.1
As a general rule, set the proportional band to 10% of the setpoint below 1000° and 5% of the
setpoint above 1000°. This setting is useful as a starting value.

Integral Settings

The controller's integral parameter (TI) is set in seconds per repeat. Some other products use an
integral term called reset, in units of repeats per minute. Table 7.2 shows integral settings versus
reset settings.
NOTE! Tuning is a slow process. After adjusting a loop, allow about 20 minutes for the
change to take effect.
Proportional Band Settings
—
TEMPERATURE
PB
SETPOINT
-100 to 99 20
100 to 199 20
200 to 299 30
300 to 399 35
400 to 499 40
500 to 599 45
600 to 699 50
700 to 799 55
800 to 899 60
900 to 999 65
1000 to 1099 70
TEMPERATURE
PB
SETPOINT
1100 to 1199 75
1200 to 1299 80
1300 to 1399 85
1400 to 1499 90
1500 to 1599 95
1600 to 1699 100
1700 to 1799 105
1800 to 1899 110
1900 to 1999 120
2000 to 2099 125
2100 to 2199 130
TEMPERATURE
PB
SETPOINT
2200 to 2299 135
2300 to 2399 140
2400 to 2499 145
2500 to 2599 150
2600 to 2699 155
2700 to 2799 160
2800 to 2899 165
2900 to 2999 170
3000 to 3099 175
3100 to 3199 180
3200 to 3299 185
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