YOKOGAWA F3CU04-0S User Manual

C5-4
IM 34M06H62-02E 2nd Edition : June 2008-00
Auto-tuning does not run if any of the following conditions is true.
- When Control Type Selection (OT) is set to “1: On/off control” or “3: Heating/cooling
on/off control”.
- When Run/Stop Selection (RUN/STP) is set to “0: Stop”.
- When Automatic/Manual/Cascade Selection (A/M/C) is set to “1: Manual” when not
in cascade controller mode.
- When Automatic/Manual/Cascade Selection (A/M/C) of the primary loop in cascade
control is not set to “2: Cascade.”
- When Automatic/Manual/Cascade Selection (A/M/C) of the secondary loop in
cascade control is not set to “0: Automatic.”
Any of the following events will abort an auto-tuning session.
- When any of the conditions mentioned in the previous paragraph becomes true.
- When the module is powered off.
- When entering the Setup mode.
- When a burnout or AD converter error is detected.
- When auto-tuning fails to end even after running for approximately 24 hours.
- When the Start Auto-tuning (AT) parameter is set to “0: Off”.
You can check the status of auto-tuning using the Auto-tuning Completed (AT.RDY) input
relay and the Auto-tuning Status (AT.STUS) I/O register.
The AT.RDY input relay is 1 when the Start Auto-Tuning (AT) relay is 0, and it is 0 when
the AT relay is set to an integer from 1 to 5.
Table C5.2 Auto-tuning Completed (AT.RDY) Relay
Input Relay Number
Xnn
*1
Symbol Description Data Range Interrupt
Loop1 Loop2 Loop3 Loop4
X04 X12 X20 X28 AT.RDY Auto-tuning Completed
0: Auto-tuning in progress;
1: Auto-tuning completed

*1  denotes the slot number where the module is installed.
Table C5.3 Auto-tuning Status (AT.STUS)
AT.STUS Description Remarks
0 Normal exit Normal exit;
At power on; or
In Setup mode.
1 Executing Auto-tuning is in progress
2 Manually stopped AT is set to “0: Off” during auto-tuning execution.
3 Error exit One of the following conditions was true during auto-tuning execution.
- A burnout or AD converter error is detected.
- Auto-tuning fails to terminate even after running for approximately 24 hours.
- RUN/STP is set to “0: Stop”.
- A/M/C is set to “1: Manual” when not in cascade controller mode.
- A/M/C of the primary loop in cascade control is set to any value other than
“2: Cascade”.
- A/M/C of the secondary loop in cascade control is set to any value other than
“0: Automatic”.

YOKOGAWA F3CU04-0S Specifications

General

Brand	YOKOGAWA
Model	F3CU04-0S
Category	Control Unit
Language	English