172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
316
8.19 Changing the Action at Power ON (Hot/Cold Start)
When restarting following a power failure (power OFF from ON), the start action can
be selected by the following parameters:
Hot/Cold start
Start determination point
RUN/STOP selection when power is restored
MAN/AUTO selection when power is restored
LOC/REM selection when power is restored
LOC/EXT selection when power is restored
Output value selection when power is restored
In addition, the start action can also be selected from the aforementioned settings
when switching from STOP to RUN, in cases other than power failures.
Description of function
Hot/Cold start
Recovery action from power failure can be selected from the following.
For PID control or Heating/Cooling PID control
Action when power
failure recovers
Operation mode when power
failure recovers
Output value when power failure
recovers
Hot start 1
Same as that before power
failure
Near the output value before power
failure occurs
Hot start 2
Same as that before power
failure
Auto
mode
Computed control
output value
2)
Manual
mode
Output limiter low
Cold start
Manual control mode
Output limiter low
STOP start
Started in the Reset mode
regardless of the Operation mode
before power failure
1)
Manipulated output value (MV) at
STOP
Action to follow
when power is
restored
Adheres to the setting for
RUN/STOP selection when
power is restored, MAN/AUTO
selection when power is
restored, LOC/REM selection
when power is restored,
LOC/EXT selection when power
is restored
Adheres to the setting for output
value selection when power is
restored
Factory set value: Action to follow when power is restored
1)
If changed to RUN from STOP by RUN/STOP transfer after start, set to the operation mode before power failure occurs.
2)
The result of control computation varies with the control response parameter.
If Startup tuning (ST) function is executed or an automatic temperature rise is
made just when the power is turned on or selection is made from STOP to RUN
as one of the startup conditions, control starts at Hot start 2 even if set to Hot
start 1 (factory set value).
Start determination point
Determination point of Hot start 1 is set. Determination point of start is a deviation
setting from the Set value (SV).
The start state is determined according to the Measured value (PV) level
[deviation from set value] at power recovery.
Summary of Contents for SC-F71
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Page 18: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 17 Differential temperature control ...
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Page 293: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 292 Checking PID values ...
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