Pixsys ATR 621 series, Руководство пользователя

Страница: 22 / 100

22 ATR 621 - User manual
8.3
Manual tuning
Manual tuning procedure allows user a greater fl exibilty on deciding to upda-
te PID parameters. To enable this function set

on parameter 11

.
To start manual tuning procedure, follow the table below:
Press Display
1 Press until red display shows

.
2
Green display shows

, led TUN turns on and procedure
starts.
Controller activates output increasing (or decreasing - if cooling regulation)
the process value entered on parameter 12

. Than it turns off the ou-
tput and calculates the new PID parameters depending on overshoot/under-
shoot oscillations.
It is possible to end manual tuning procedure any time, following the points
below:
Press Display
1 Press until red display shows

.
2
Green display shows

, led TUN turns off and procedure
ends. PID parameters will not be modifi ed.
8.4
Recovery of interrupted cycle
Recovery function is particulary useful for kilns temperature regulation. After
a power failure, at restarting ATR621 can resume the interrupted cycle. There
are two recovery modes:
8.4.1
Recovery with automatic gradient
To enable cycle recovery with automatic gradient, set 1 on parameter 38 as

. This mode does not operate for cooling regulations. 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 possible.
If gap between process and setpoint is limited (not exceeding the value