Azbil C1M - Page 117

5-59
Chapter 5. Functions
Operation type Setting Direct action Reverse action
Loop diagnosis 2 21
Turns on when the PV does not change according to the increase or decrease of the MV.
Use this setting to detect a failure of the actuator, etc.
zSettings
• Main setting: MV
• Sub-setting: the amount of the change in the PV from the time when the MV exceeds the
value set for the main setting
• ON delay time: diagnosis time
zOperation specifications
Turns ON if the PV does not reach the value obtained by adding (subtracting) the sub-
setting value to the PV when the MV exceeds the main setting (condition 1) within the
diagnosis time (ON delay time)(condition 3) even though an MV greater than the main
setting is retained (condition 2).
zNote
To set the ON delay time, the user level (C79) should be set to “advanced configuration.”
The ON delay time is set to 0.0 s when the product is shipped.
For heating control
If cond. 1 & 2 are met, ON delay starts
Reference
PV
Main
setting
Time
Cond. 3
ON delay time
Area meeting
cond. 1
Sub-setting
(if 0 or more)
Area meeting cond. 2
Time
Time
PV
MV
EV
ON
HYS
For cooling control
If cond. 1 & 2 are met, ON delay starts
HYS
Time
Time
Time
PV
MV
EV
ON
Reference
PV
Main
setting
Sub-setting
(if 0 or more)
Area meeting
cond. 1
Area meeting cond. 2
Cond. 3
ON delay time