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...5.7.1 Auto-tuning Page
At–OFF
StArt
AUtO
tUNE
StArt
Constant LED
100. 3
100. 5
100. 3
or
OP 50. 0
Control Output
At–ON
StOP
or
At–UPd
or
At–ENd
No
Errors
Errors
AUtO
tUNE
A-tUNE
A–tUNE
or
FAIL
Flashing With
Error
Message
Auto-tune Status/Enable
StArt
Select
time taken for completion of auto-tuning is dependent on the speed of response of
the controlled process.
Note. If
Auto-tune
auto-tune cycle is complete or ended by the operator.
Process Variable (upper display)
1 0 0 . 3
1 1 0 . 5
Control Set Point Value (lower display)
AL
RMT
AT
MAN
The set point is displayed for monitoring only and cannot be changed at this frame.
Process Variable (upper display)
100. 3
Control Output (lower display)
W 50. 0
The output value is displayed for monitoring only and cannot be changed at this
Valve
frame.
Status/Position
Auto-tune Status and Enable/Disable
At–ON
At–UPd
At–ENd
100. 3
100. 5
Operating
Page
Auto-tune Error Messages
A–tUNE
If a
Failure
terms are retained and the auto-tune LED flashes.
CAUtN
If a
Caution
Flashing With
continues in the automatic mode. Any errors are acknowledged when exiting this
frame and the auto-tune LED flashes.
Error
For an explanation of error messages – refer to Table 5.1 overleaf.
Message
to enable auto-tune cycle. The 'AT' (auto-tune) LED is illuminated. The
is selected it is not possible to exit the
– (Auto-tune On) auto-tuning can be switched off by pressing the
StOP
key to select
and then pressing the
– (Auto-tune Update) the auto-tune cycle is complete and the calculated
terms are being written to memory.
– (Auto-tune End) the auto-tune cycle is complete. If no failures occur
during the cycle, the calculated values are loaded into memory as new
control terms and the instrument returns automatically to the
. If failures or cautions occur during auto-tuning, error
Operating Page
messages are displayed in the next frame.
occurs the controller reverts to the manual control mode, the old control
occurs the calculated control terms are loaded into memory and control
5 CONTROL OPERATION...
until the
Auto-tuning Page
key.
23
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