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Setback (continued)
4 Use Screen 11 to set the temperature setpoint to which the process air will
revert to once the air at the outlet of the drying hopper has reached its setpoint.
5 Use the setback temperature band screen (Screen 22) to set the amount the
return air temperature has to drop below to activate setback temperature
before the original process temperature is restored. For example, if the activate
setback temperature was 180ºF (82.2ºC) and the dryer was in setback, the actual
temperature measured at the outlet to the hopper would have to drop below
160ºF (71ºC) to restore the original process set point.
To set-up setback on the load rate option
1 Reference the flow chart on Page 4-4 and follow the menu tree path to
access Screen 25.
2 Turn the setback function for the load rate option to "On" or "Off". "Off"
turns the setback load rate option off and the dryer will not change the process
set point. The "On" setting tells the dryer to go into setback when the load rate
gets to its set number of loads per hour (Menu 9, Screen 12).
3 If you have decided to turn the temperature setback to "On", go to Screen
12. This screen shows the number or load dumps per hour, set point and actual.
When the actual drops below the setpoint, the dryer will go into setback mode.
When the actual goes above the setpoint, the dryer will return to the normal
process temperature (Screen 5).
6-16 l Troubleshooting