MCT-MC
4.3
FDC MCT-MC
- 110 -
Offline Setup
10.1 Power Recovery
The Power Recovery setting allows the user to select how the system should restart in the event of a power
failure while an automatic ramp/soak program was running. When power is restored, the MC will perform the
selected recovery action. To set the power recovery action, push the recovery mode button for the desired
setting to select it as the power-up state. The selections are mutually exclusive to one another, i.e., only one
can be selected at a time. As a new selection is made, the previous setting will be automatically turned off.
Select
Continue from SP
to have the MC resume the program from where it left off on loss of power. The set
point ramp will continue from the set point value at the time of power interruption.
Select
Continue from PV
to have the MC resume the program from where it left off on loss of power. The set
point ramp will continue from the current process value of the loop and not the last set point value.
Select
Static Mode
to have the MC default to single set point operation on power-up. The program will be
stopped and the loops will control to the last static set point entry.
NOTE:
When a program is NOT running and a power down/up sequence occurs, the MC will return with the
same set points and system events active as when the power was lost.
See Appendix section A.3 Profile Recovery Detail for a more detailed explanation and
examples of program recovery operation.
10.1.1 Recovery Interval
During program operation, the current program progress is stored in memory on each step change and at 6
minute intervals during step operation. During static set point operation, the current control set point is also
stored in memory every 6 minutes.
For program operation, this results in a possible recovery error of up to 6 minutes. For example, a program is
running and enters step 2 which is a ramp step from 0 to 100 degrees in 10 minutes. If power is lost at 5
minutes into the step and “Continue from SP” is the selected recovery mode, when power is restored the
program will begin operation from the beginning of step 2 with a set point of 0. It will not resume operation from
50 degrees at 5 minutes into the step. If the power is lost at 8 minutes into the step (2 minutes remaining), the
program will continue from the last save point which was 6 minutes into the step (4 minutes remaining) with a
set point of 60 degrees. For soak steps the set point remains a constant and time remaining is the only variable.
So as with the ramp step, the time remaining in the step will continue from the last save point.
When in static set point operation, if the set point is changed and power is immediately cycled, the loop control
will resume operation when power is restored from the previous set point, not the one just entered. The save
interval is from power up, so when a new set point is entered, it could be saved within seconds or take up to 6
Summary of Contents for MCT-MC 4.3
Page 1: ...MCT MC 4 3 User Manual MCT MC 4 3 User Manual Rev A February 2018...
Page 176: ...MCT MC4 3 FDC MCT MC 176 Appendix...
Page 177: ...MCT MC4 3 Appendix 177 FDC MCT MC Open Frame Power Supply Specifications...
Page 178: ...MCT MC4 3 FDC MCT MC 178 Appendix...
Page 179: ...MCT MC4 3 Appendix 179 FDC MCT MC A 6 Power On Delay Relay Specifications GE1A C10HA110...
Page 180: ...MCT MC4 3 FDC MCT MC 180 Appendix...
