ABB COMMANDER 1911 Operating Manual page 25

...5.7.1 Auto-tuning Page
At–OFF
StArt
AUtO
tUNE
StArt
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
Select
illuminated. The time taken for completion of auto-tuning is dependent on the
speed of response of the controlled process.
until the auto-tune cycle is complete or ended by the operator.
Constant L.E.D.
1 0 0 . 3
Process Variable (upper display)
1 1 0 . 5
AT
AL RMT MAN
Control Set Point Value (lower display)
The set point is displayed for monitoring only and cannot be changed at this
frame.
100. 3
Process Variable (upper display)
W 50. 0
Control Output (lower display)
Valve
The output value is displayed for monitoring only and cannot be changed at this
Status/Position
frame.
Auto-tune Status and Enable/Disable
At–ON
At–UPd
At–ENd
100. 3
100. 5
Operating
Page
A–tUNE
Auto-tune Error Messages
If a
Failure
CAUtN
control terms are retained and the auto-tune l.e.d. flashes.
Flashing With
If a
Caution
control continues in the automatic mode. Any errors are acknowledged when
Error
exiting this frame and the auto-tune l.e.d. flashes.
Message
For an explanation of error messages – refer to Table 5.1 overleaf.
to enable auto-tune cycle. The 'AT' (auto-tune) l.e.d. is
StArt
Note. If is selected it is not possible to exit the
Auto-tune
– (Auto-tune On) auto-tuning can be switched off by
pressing the
to select
StOP
– (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
failures or cautions occur during auto-tuning, error
messages are displayed in the next frame.
occurs the controller reverts to the manual control mode, the old
occurs the calculated control terms are loaded into memory and
5 CONTROL OPERATION...
Auto-tuning Page
switch
and then pressing the
Operating Page
switch.
. If
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