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3.20.6.1 CONT
If CONT is selected, then when power is restored the profile continues from where it was interrupted when
power was lost. The parameters such as set point value (SV), time remaining (DTMR) and cycle remaining
(CYCR) will be restored to their power-down values. For applications that need to bring the process value to
the set point value as soon as possible, this is the best choice. The two diagrams below illustrate the
respective responses.
Power failure recovery from profile at Dwell segment Power failure recovery from profile at Ramp segment
3.20.6.2 PV
If PV is selected, when power is restored the set point starts at the current process value (temperature), and
then runs to the target set point of the active segment. This choice provides a smoother recovery. The two
diagrams below illustrate the respective responses
Power failure recovery from PV at Dwell segment Power failure recovery from PV at Ramp Segment
3.20.6.3 SP1
If SP1 is selected, when power is restored the profile is disabled and the controller enters static mode, and
SP1 is selected for control set point.
3.20.6.4 OFF
If OFF is selected, when power is restored the controller is disabled enters OFF mode. All the control outputs
as well as alarms and events are off.
3.20.7 Holdback
As the set point ramps up or down (or dwells), the measured value (temperature) may lag behind or deviate
from the set point by an undesirable amount. "Holdback" is available to freeze the profile at its current state.
The action of Holdback is the same as a deviation alarm. Holdback has three parameters.
1. HBLO: Holdback low band
2. HBHI: Holdback high band
3. HBT: Holdback wait time
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