Recovery Of Interrupted Cycle; Recovery With Automatic Gradient - Pixsys ATR 902 Manual Instalador

Recovery of interrupted cycle

9.4
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:

Recovery with automatic gradient

9.4.1
To enable cycle recovery with automatic gradient, set 1 on parameter 22
  
. 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
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).
NB: After a power-off the chronometer will restart from 00:00.

) cycle will resume from the point of interruption; if
PROCESS
SETPOINT
Step 2
Step 1
Step 3
Step 2
Black-out
Time
ATR902 - User manual 21