Watlow CLS200, MLS300 and CAS200 - Manual (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.