Installation manual

Tuning the Controller for PID Control
900M050U00  Athena Controls, Inc. 16-3
8. When the controller has completed autotuning successfully, the flashing tunetune will
disappear. The display will revert to the normal mode operating display, with the
process value on the top line and the setpoint on the lower line. The controller will
save the tuning parameter values in the proportional band, rate, and auto reset
parameters. (The new tuning values can be viewed in the CtrLCtrL menu.)
If the Autotune was unsuccessful, the top line will briefly display ErEr plus a two-digit
error code, then go back to flashing StbYStbY. Refer to 16.2.3 for the Autotune error
codes. Fix the problem and try tuning again.
9. Once Autotune has been completed successfully, and the PV and SV are on display,
the controller is controlling the process.
Monitor the process. If unacceptable overshoot occurs, change the Autotune
damping setting to high and repeat the Autotune. If the process response is
sluggish, change the damping setting to low and repeat the Autotune.
Once setup is complete, we recommend changing the security access level to the most
restrictive level suitable for your application. See Section 17 for details.
16.2.3 Autotune Error Codes
If an Autotune error occurs, the top line of the display will alternately show tunetune and an
error code for three seconds before the autotuning terminates and the controller goes
back into standby mode. The error codes are in the table below.
Error Code Description
02
Neither output is configured for PID using the O1.tYO1.tY or O2.tYO2.tY
(output type) parameter in the OutPOutP (output menu).
03 The process changes in the wrong direction. The cause is
usually reversed thermocouple leads or an incorrectly configured
O1.AcO1.Ac or O2.AcO2.Ac (output action) parameter.
05 There is not enough difference between initial PV and the
setpoint. For Autotune to work, the difference must be at least
1% of supported sensor span.
08
The startup curve (change in PV) was not acceptable to the
Autotune algorithm. This could be caused by a process upset
that occurred during tuning. Try Autotuning again when the
process is stable. If the error recurs, your process is not suitable
for Autotuning. Use manual tuning as described in 16.3.
09 The Autotuning timed out, because the process was
unresponsive (or extremely slow). Your process is not suitable
for Autotuning. Use manual tuning as described in 16.3, or
configure the controller for on/off control (see 1.5.3 and 8.2).