Watlow CLS200, MLS300 and CAS200 User Manual download pdf (Page 51)

Chapter 3: Controller Parameter Descriptions

Communications Speciﬁcation 45

Parameters (by number)

Proportional Band/Gain (0)

The MLS and CLS controllers let users modify the Proportional Band

(PB), but they internally represent the PB as a Gain value.

• Range: 1 to 255.

• Heat/Cool: 35.

• Pulse: 20.

• Extruder Cool CH: 175.

Users edit the Proportional Band, but the controller uses a Gain value

internally. This equation illustrates the relationship between the PB and

Gain:

For example, on a J-type thermocouple the high range is 1400 and low

range is –350, so a gain of 35 gives a PB of 50 degrees. (The input type

ranges are listed in the Input Type section and in the User’s Guide for

your controller.)

Derivative Term (1)

This parameter contains the derivative term for PID output calculations.

(The derivative term is also known as the TD or Rate.)

• Range: 0 to 255 seconds.

• EX PROM: 125.

• Pulse Loop: 0.

• All Others: 0.

Integral Term (2)

This parameter contains the integral term for PID output calculations.

(The integral term is also known as the Reset or TI.)

• Range: 0 to 6000 seconds per repeat. (Setting the TI to 0 seconds

turns off the integral action.)

• STD Heat: 180.

• STD Cool: 60.

• Extruder: 500.

• Pulse: 0.

Proportional Band =

(High Range Value) – (Low Range Value)

Gain

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Watlow CLS200, MLS300 and CAS200 User Manual Page 51