Watlow CLS200, MLS300 and CAS200 User Manual download pdf (Page 81)

Chapter 3: Controller Parameter Descriptions

Communications Speciﬁcation 75

Cascade Heat/Cool Span (90)

This parameter is multiplied by the heat and cool outputs of the primary

loop in the cascade calculation.

• Range: –9999 to 9999.

• Default: 0.

Ratio Control Master Loop Number (91)

This parameter speciﬁes the ratio control master loop number to obtain

the process variable. This number cannot be the same as the current

loop. Setting this to 0 disables the ratio control feature for this loop.

• Range: 0 (none) to MAX_CH.

• Default: 0 (none).

Ratio Control Minimum Setpoint (92)

This parameter speciﬁes the minimum allowable setpoint in the ratio

control calculation. The resulting setpoint will not go lower than this.

This number must not be higher than the maximum setpoint (command

89).

• Range: –999 to 9999 (depending on the precision in the master loop).

• Default: 250 (25°F) for a J-type thermocouple.

Ratio Control Maximum Setpoint (93)

This parameter speciﬁes the maximum allowable setpoint in the ratio

control calculation. The resulting setpoint will not go higher than this.

This number must not be lower than the minimum setpoint (command

88).

• Range: –999 to 9999 (depending on the precision in the master loop).

• Default: 250 (25°F) for a J-type thermocouple.

Ratio Control Control Ratio (94)

This parameter is multiplied by the master loop process variable in the

ratio control calculation. These values are multiplied by 10 to retain 0.1

ratio precision.

• Range: 1 to 9999 (control ratio 0.1 to 999.9).

• Default: 10 (control ratio 1.0).

Ratio Control Setpoint Differential (95)

This parameter speciﬁes the setpoint used as an offset for each loop.

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Watlow CLS200, MLS300 and CAS200 User Manual Page 81