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4. CONFIGURATION
80703B_MHW_2850T/3850T_02-2019_ENG
preconfigure sets of operating parameters that can
easily be called up. The number of parameters available
to groups is limited to those regarding PID control for
heating and/or cooling. The parameters for all groups
are overwritten at the end of the self-tuning process.
The group will be set to 1 at the time of start-up.
•
Man
: touch the key to enable or disable manual regula-
tion. The key turns green when on.
•
P man
: percent power that can be set in manual mode.
This percentage remains identical to the automatic
power when the PID is not in a manual mode. Otherwi-
se, it can be set. The PID_MAN_POW_n variables allow
you to manage this parameter in GETlogic and GET-
view
•
Antispike filter
: antispike filter representing the
minimum duration of an ON or OFF impulse on digital
outputs, measured in seconds. This parameter is not
displayed if manual control or burst firing control (with
CT set to 0) is enabled.
•
Soft start
: enables gradual initial power distribution. If
enabled (value other than 0), the next time the instru-
ment is turned on power will not be deliverable at
100% right from start-up, but will follow a time ramp
set in minutes.
For example, set 10 minutes to achieve: 1 minute
after turning on, maximum power will be 10%, after
5 minutes it will be 50% and maximum power will be
reached after 10 minutes. The power shown in the
page PID cfg reveals the effective power delivered at
that time on the physical outputs of the PID. The power
calculated by the PID algorithm alone is available in the
BASE2 page and in the PID_nn_MAN variables.
•
Dead band
: Symmetric dead band around the SET-
POINT where the PID does not change power distrib-
uted (unless derivative action). The parameter is not
displayed if manual regulation is enabled. Proportional
band calculation is reconstructed on the basis of dead
band. When we enter dead band, global control will
also change slightly.
•
Self T on
: touch the key to enable Self Tuning, mean-
ing a one-shot procedure to be run with start from
room temperature. If there is a difference between PV
and SETPOINT (in terms of absolute value) of greater
or less than 5% of the bottom of the scale (HIS-LOS),
self tuning cannot be activated. The key turns green
when on. The parameter is not displayed if manual
regulation is enabled. The Self Tuning process modifies
the parameters of all 10 parameter groups.
Self tuning consists of assessment of response to
system step, calculating control parameters which
optimise power delivery. The Self Tuning phase starts
providing the max power untill the PV reaches a value
in the middle between the starting value and the set-
point, than the power is switched off and it is evaluated
the overshoot of the system.
•
Sts
: self tuning status, indicated by a red LED when
on. The parameter is not displayed if manual regulation
is enabled.
Power
displays the percent power calculated at that
time by the PID and if used for heating (red LED) or
cooling (blue LED).
4.15.4.4. PID limit configuration
The Base 3 page lets you set PID limits.
The number of the PID being examined, which may be
changed using the
-
and
+
buttons, appears at the top of
the screen.
Turn the PID on and off with the
EN
button. The key turns
green when the PID is enabled.
The value can be entered with the virtual keyboard by
touching some parameters. The available parameters are:
•
RATIO
: indicates the value of the ratio and is only
displayed if Ratio operations were set in the Synoptic
menu.
•
SP
: Setpoint, value to be reached and maintained.
•
PV
: Process value, current value (read only).
•
Comma Red
: shows, in display only mode, PID pa-
rameters with one less decimal place than the Process
Value variable. Therefore, this operation does not
affect controller precision. The key turns green when
Comma Red is enabled.
•
HIS
: Upper range limit.
•
LOS
: Lower range limit.
•
HIL
: Maximum settable set point.
•
LOL
: Minimum settable set point.
•
HPH
: Maximum power limit in heating.
•
HPL
: Minimum power limit in heating.
•
CPH
: Maximum power limit in cooling.
•
CPL
: Minimum power limit in cooling.
Power
displays the percent power calculated at that time
by the PID and if used for heating (red LED) or cooling (blue
LED).
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