Manual Tuning; Recovery Of Interrupted Cycle; Recovery With Automatic Gradient - Pixsys ATR 902 Manuel D'installation

9.3 Manual Tuning

This procedure allows user a greater flexibility on deciding when to update PID
parameters. To enable this function, select man. on parameter 06 tune . To start
manual tuning procedure follow the points below (when cycle is running):
Press
1 Press until red display visualizes tune .
STEP
2 Green display shows on , TUN turns on and procedure starts.
Controller activates output increasing the process value as indicated on parameter
07 s.d.tu .
Than, it turns off the ouput and calculates the new PID parameters.
It is possible to end this procedure any time, following the points below:
Press
1 Press until red display visualizes tune .
STEP
Green display shows off , TUN turns off and procedure ends. PID
2
parameters will not be modified.

9.4 Recovery of interrupted cycle

Recovery function is particulary useful for kilns temperature regulation. After
a power failure, at restarting ATR902 can resume the interrupted cycle. There
are two recovery modes:

9.4.1 Recovery with automatic gradient

To enable cycle recovery with automatic gradient, set 1 on parameter 22 r.i.cy . At
restart, after a power failure, controller will operate like this:
1. If a power failure occurs during a rising step, the gradient will be same as the
operating step (setpoint temperature equal to the temperature read by the
sensor).
2. If a power failure occurs during a holding step, two options are available: If gap
between process and setpoint is limited (not exceeding the value on parameter
21 m.G.s.e. ) cycle will resume from the point of interruption; if the gap is bigger
but controller has not yet executed a cooling step, the cycle will go back to the
closest rising step and will repeat the procedure as explained on point 1.
3. If a power failure occurs during a cooling step or a holding step, after that a
cooling step has already been completed, the setpoint will match the the
temperature read by the sensor, without including any rising and even skipping
to next step if necessary (this a safety tip particularly for glass working).
16 - ATR902 - User manual
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