14
Advanced Features and Settings
Model 101303-50
Caution: The autotune algorithm overrides these power limits
during its execution. Do not autotune your system if
it can be damaged by 100% duty cycle.
Other features
There are number of other features which are supported on the controller, but are
typically only useful under very special circumstances. These are described briefly
here. Please consult the
Watlow
®
Series 96 user’s manual for more information.
Caution: There may be subtle intricacies and implications for
system
operation
when
implementing
these
advanced features. These alternate modes are not
recommended except for use by expert users in
special applications.
1.
Bumpless Failure Mode:
the controller output may be configured to keep
outputting a fixed percent power rather than shutting off after a sensor fault.
2.
Additional alarm configurations:
The over-temperature alarm may be
configured to be non-latching (default is latching, meaning it must be
manually reset even when the process is back in the safe region). The alarm
may be configured to be two-sided, silenceable (ability to be overridden),
and/or triggered by a deviation from setpoint. These other alarm modes
should be very well understood before being implemented and are not
recommended for general use.
3.
Calibration:
Sensor input and analog output may be manually calibrated to
change offsets or gains. This is rarely necessary since incorrect offsets and
scaling are almost always caused by improper grounds, faulty wiring, or
other pathological problems. The controller should not be recalibrated
unless it is certain that there are no other problems.
4.
PID parameters:
PID parameters may be manually adjusted. Note that
control can rarely be improved upon, and danger of adversely affecting
control performance is eminent.
