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11 • SELF-TUNING / AUTO-TUNING / SOFT-START / AUTO-MAN
TURNING ON SELF-TUNING
If enabled, this function starts when the instrument is turned
on or by simultaneously pressing the F and Raise keys for 3
seconds.
The controlled variable flashes on the display. Self-tuning
can be used only for heating systems. For very fast systems
(100°C/min) limit PtU self-tuning power.
The function starts by supplying power (PtU). When
temperature is reached (Setpoint-room temperature)/2, it turns
power off and begins a wait phase to identify parameters.
The procedure ends with resumption of control, which uses the
calculated parameters.
When the self-tuning phase ends (i.e., when peak is reached),
the calculated parameters are saved and any preset
parameters are lost.
To interrupt self-tuning when in progress, simultaneously press
the F and Raise keys for 3 seconds (press F first).
The upper display stops flashing and the self-tuning function is
deactivated and disabled (code S.tu in Phase 0 is automatically
changed). Repeat this procedure to activate the self-tuning
function (if enabled). With self-tuning enabled, the term "SOF"
in CFG1 is replaced by PtU power value supplied in self-tuning
phase in range 0...100%.
By setting Pt U = 0 Pt.U = 100% by default%.
TURNING ON AUTO-TUNING
If enabled, this function starts when the setpoint is reached for
the first time (± 4 scale points).
The corrective action is on the value of the proportional band.
Auto-tuning is suspended each time the setpoint is changed,
and the control parameters are returned to their starting values.
Action resumes when the new setpoint is reached.
The proportional band cannot be changed during auto-tuning:
you have to disable auto-tuning to do this.
TURNING ON THE SOFT-START FUNCTION
If enabled, this function partializes power as a percentage of
the time elapsed since instrument turn-on compared to the
time set (0...99.9 min) ("SOF" parameter, phase CFG1). Soft-
start is an alternative to self-tuning, and is activated after each
instrument turn-on.
• RS232 / TTL interface for GEFRAN instrument configuration
80343I_MHW_1000_07-2011_ENG
AUTO/MAN FUNCTION, MANUAL CONTROL OF OUTPUT
WITH BUMPLESS AT SWITCH TO AUTOMATIC
In normal operation, press the F key. After a scan of the
alarm limits (and load current if applicable), the lower display
shows the percentage of power supplied in output in the
range 0...99% followed by letter P, while the upper display
shows the process variable (PV).
99% is considered maximum power. This data remains on
the display until the F key is pressed again, which returns the
display to normal condition (PV/SP).
In MAN mode, you can set the control (power) output from the
panel keys in the range 0.0...99.9%.
MAN mode is activated by simultaneously pressing the Raise
and Lower keys in output display phase (indicated by letter P
on the lower display).
You can set power in the above-mentioned range by means of
the Raise and Lower keys.
In change phase, letter P is replaced by the decimal figure
of the power level, which resumes flashing when the key is
released.
99% is considered maximum power.
When switching to manual, the instrument delivers either the
last manual power level saved or the automatic power at the
time of switching, depending on the mode selected (Ctr code)
configuration phase CFG.2. Press the F key to return to
Automatic.
Switching from Manual to Automatic takes place in
"BUMPLESS" mode if the process variable is within the
proportional band.
The manual power value is saved. If the instrument is
configured as ON-OFF controller:
In Automatic:
MAIN output = ON, corresponds to displayed power = 99;
MAIN output = OFF, corresponds to displayed power = 0;
In Manual:
Set power <= 49.9 corresponds to MAIN output = OFF;
Set power >= 50.0 corresponds to MAIN output = ON;
You can disable the MAN/AUTO function by setting the
software protection to "Pro" = "Pro" + 16.
• ACCESSORIES
Configuration software for Gefran products: Instruments, Drives; Sensors, Automation.
Compatible with Windows 2000, XP, Vista.
CD-ROM with selectable Italian/English language, with kit for PC-instrument serial port
connection.
GF_eXK-0-0-0
GF_eXPRESS Software on CD-ROM, complete with
RS232/TTL converter cables for PC and Geflex connection.
• ORDER CODE
11
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