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Autotuning
To place the controller in Autotune mode:
1) Configure the controller by following the directions for
In order for the controller
Initial Setup Sequence through Step 3 on page 16. Set
to autotune properly, the
damping parameter. (See page 26.)
setpoint value must be at
least 1% of span above or
2) If the controller is not already in Standby mode, place it
below the initial process
in Standby now as follows. Press and hold the
value. Make sure that the
Setpoint Target Time
Mode/Enter
parameter is set to OFF.
indicate your current operating mode. Press the Raise
key or Lower
Tuning accuracy increases
again and the display will alternate between
as the spread between
the process value. This will deactivate all outputs.
ambient and setpoint
value increases.
3) If Setpoint Value has not been entered, adjust setpoint
Tuning should be
now by using the Raise or Lower key to set the desired
performed with system
setpoint.
in equilibrium (no latent
4) Wait for process to stabilize before proceeding, e.g., in
energy remaining).
the case of a heating and cooling process, return to
ambient temperature.
5) Initiate Autotuning. Press and hold the Mode/Enter key
again for three seconds, then press the Raise or Lower
key repeatedly until
Mode/Enter key again. The display will alternately indicate
proper proportional band, derivative, and integral values
for the process. If unacceptable overshoot occurs on
restart, shut down the process and increase the damping
setting. If sluggish response is observed, shut down the
process and decrease the damping setting.
key for three seconds. Display will
key to select Standby. Press Mode key
appears. Finally, press the
and process value as the controller "learns" the
Autotuning
and
30
31
If a tune error condition occurs, the upper display will toggle
between
and a numeric error code for three seconds
before the tune process terminates. The controller will then
automatically go into Standby mode when a tuning error
occurs. Possible error codes are:
02 = No PID Device Configured
03 = Incorrect Output Action
05 = Insufficient Setpoint-Process Value Deviation
08 = Invalid Tune Results
09 = Tune Timeout
Autotuning Procedure Diagram
Note: Keep in mind that the setpoint value must be at least
1% of span above or below the initial setpoint, and that the
process value must be stable prior to initiating the tune.
Current
Standby
Mode
Mode
Press
Hold for
Press
Once
three
seconds
Standby
Autotune
Mode
Mode
Press
Hold for
Press until
Once
three
seconds
appears
Flashes
Flashes
Controller is
now autotuning
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