Overview
OVERVIEW
INSTALLATION
The Model 3300 controller is designed to be mounted in a
1/32 DIN panel cutout and the Model 9300 in a 1/16 DIN
cutout. See the
INSTALLATION
section.
SET-UP
After installation the controller requires programming with
the following information:
Type of Input Sensor
Operating unit (C or F etc)
Type of Output Device
Temperature Setpoint
Note:
The controller will not be operational until this
information is entered.
When the above information has been programmed into the
controller it will be operational with the following factory
PID (proportional band, integral time, derivative time)
settings.
Proportional band/Gain
10°C/18°F
Integral time/Reset
5 mins
Proportional cycle-time
20 secs
Derivative time/Rate
25 secs
DAC Derivative approach control
1.5
AUTOTUNE
To precisely control an application the controller will need
to be ‘tuned’ using the built-in
‘AUTOTUNE’
feature.
Autotune ‘teaches’ the controller the main characteristics of
the process and ‘learns’ by cycling the output on and off.
The results are measured and used to calculate optimum PID
values which are automatically entered in the controller
memory.
During
AUTOTUNE
the optimum cycle-time is calculated but
is not automatically implemented. The cycle-time requires
manual acceptance unless pre-selected.
To ensure good control over a wide range of applications
two versions of the Autotune program are provided,
TUNE
and
TUNE AT SETPOINT
.
The
TUNE
method normally achieves the best results.
Starting with the load cool, tuning occurs during warm-up
preventing overshoot. This method of tuning is
recommended.
The
TUNE AT SETPOINT
method is used for specialist
applications. eg. Heat-cool, multizones and processes below
100°C/200°F. During the tuning cycle some overshoot occurs
because the tuning cycle is at set point.
The
DAC
setting is not re-calculated.
3
