Instruction Manual

Watlow Series PD ■ 36 ■ Chapter 7 Configuration Page
Figure 36 — Control Loop Web Page Tag Descriptions
Tag # Control Loop
Configuration Parameters
Parameter Description
Control Loop
1. Loop Action Sets the Control Loop output action Off (disabled), heat, cool or
heat/cool.
2. Loop Heat (indirect) Algorithm Sets the Heat output method of control. PID or On/Off.
3. Loop Cool (direct) Algorithm Sets the Cool output method of control. PID or On/Off.
Input Failure Parameters
4. Failure Latching Sets the input sensor failure latching action. Latching or Non-
latching.
5. Output transition from
Auto Mode to:
Selects the controller’s output mode upon input failure. Off (dis-
abled), Bumpless Power or Fixed Power.
6. Failure Fixed Power Sets the fixed output power level for fixed output power level upon
input failure. -100 to 100%.
Set Point Limits
7. Low Limit Sets the minimum value for auto set point adjustment. Range de-
pends upon sensor selected.
8. High Limit Sets the maximum value for auto set point adjustment. Range de-
pends upon sensor selected.
On/Off Parameters
9. Hysteresis Heat (indirect) Sets the switching differential when configured as On/Off method
of control.
10. Hysteresis Cool (direct) Sets the switching differential when configured as On/Off method
of control.
PID Parameters
11. Start Autotune Start an autotune.
12. Autotune Set Point Sets the autotune set point as a percentage of the auto set point.
50 to 150%.
13. PID Sets Sets the PID capability for single or multiple PID sets.
14. PID Set 1, Proportional Band Sets proportional band value for PID Set 1.
15. PID Set 1, Integral Sets integral value for PID Set 1.
16. PID Set 1, Derivative Sets derivative value for PID Set 1.
17. PID Set 1, Dead Band Sets dead band value for PID Set 1.
Ramp to Set Point Parameters
18. Ramp Action Selects the ramp to set point action for the single set point ramp
function. Off (disabled), Ramp on Power Up, Ramp on Set Point
Change, or Ramp on Power Up and Set Point Change.
19. Ramp Rate Sets the ramp rate for the ramp to set point function.
20. Ramp Rate Time Units Sets the ramp rate time units for the ramp to set point function.
Ramp time in degrees/units per hour or per minute.