172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
188
Re-hold action
When Re-hold action is ON, the event action is also suppressed at the Set value (SV)
change until the Measured value (PV) has entered the non-event range.
Action condition
Hold action
Re-hold action
When the power is turned on
Works
Works
When transferred from STOP (control
STOP) to RUN (control RUN)
Works
Works
When the Set value (SV) is changed
Does not work
Works
[Example] When Event 1 type is the deviation low:
When re-hold action is OFF and event output type is deviation, the event output is
produced due to the Set value (SV) change. The re-hold action suppresses the alarm
output until the measured value has entered the non-event range again.
When high alarm with hold action/re-hold action is used for Event function,
alarm does not turn on while hold action is in operation. Take measures to
prevent overheating which may occur if the control device fails.
The re-hold action will be unavailable for any of the following.
Setting of Soft start or Setting change rate limiter is other than
“0 (no function)”
Remote mode
Cascade control
Differential temperature control
Parameter setting
Event 1 hold action [Engineering Mode: Function block No. 41 (
Fn41
)]
Parameter symbol
Data range
Factory set value
EH O 1
0: Hold action OFF
1: Hold action ON
2: Re-hold action ON
Setting hold or re-hold action on the event that is not available
with hold and re-hold actions will just be ignored.
0
Event 2 hold action [Engineering Mode: Function block No. 42 (
Fn42
)]
Parameter symbol
Data range
Factory set value
EH O 2
0: Hold action OFF
1: Hold action ON
2: Re-hold action ON
Setting hold or re-hold action on the event that is not available
with hold and re-hold actions will just be ignored.
0
Set value
Event set value
Measured value (PV)
Set value
Event set value
Measured value (PV)
Before the change of
set value
After the change of
set value
The change of set value
Event area
Event area
NOTE
Содержание SC-F71
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Страница 359: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 358 Setting Procedure Setting Soft start function ...
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