8
Getting Started
Model 101303-50
Excellent thermal control is normally attained by automatically tuning the control
parameters (described below) to the specific thermal system. The controller should
be autotuned the first time it is used and whenever the thermal properties of the
system being controlled change significantly.
Warning: For systems that cannot tolerate the overshoot that
can occur during the autotuning process, change the
ATSP parameter (as described in the advanced
features) to a lower value so that the system
autotunes around a lower value. The default
autotuning point is 90% of the setpoint. This may
also be set to 100% to tune the controller at the
setpoint if your system allows.
Be aware that the autotuning algorithm turns power
on at 100% to measure system response. Operating
at 100% duty cycle may damage some types of
heaters, especially those used in high temperature
furnaces.
Do not autotune the system if it will be
damaged by 100% output power.
If this is the case,
refer to the
Watlow
®
Series 96 manual for the manual
tuning procedure.
1.
Set the control setpoint to a safe operating value for your system.
2.
On the control module, press the two arrows keys simultaneously until
appears in the lower display.
3.
Scroll up or down with the arrow keys until
appears in the upper
display.
4.
Press the blue advance key once to select this user menu.
5.
Press the blue advance key once or until
is displayed in the lower
display of the control module. Use one of the arrow keys to change the
upper display from
to
.
6.
Press the infinity key to return to the main display and initiate the autotune
sequence. The upper display will flash
alternately with the
temperature until it is done autotuning. This process typically takes from a
few minutes for small systems to over an hour for larger systems.
8. Verify safe alarm conditions
Your temperature controller is now configured for your system and ready to use.
During normal operation, the current process temperature will be visible in the
upper display and the setpoint temperature in the lower display.
If the over-temperature alarm setpoint is exceeded (optional feature), the message
will flash in the upper display of the limit module and heater output will be
disabled. This alarm can be cleared by pressing the infinity key after the process
temperature has fallen more than 2 °C below the alarm setpoint.
