Overshoot :
Condition whereby
process changes.
temperature
exceeds
set point due
to
initial
power
up or
Proportioning control.
P control
Parameter:
Any of a set of physical properties
electronic control to given inputs.
whose values determine the response of an
PD control:
PI control:
PID
control:
Process variable:
Proportioning control with rate action.
Proportioning control with auto-reset.
Proportioning control with auto-reset and rate.
Signal or value reflecting
relative humidity, etc.
the status of the process, such as temperature,
Programmed
display data:
Displayed information which gives the operator/programmer the “programmed”
or intended process information, i.e., intended set point, intended time-in-
step, intended process relative humidity, etc. See “Actual displayed data.”
Proportional band:
The span of temperature
takes place.
about the set point where proportional control action
ProfiIing:
Executing several adjacent program steps where each step defines a ramp, or
a sloping control graph.
Program Step:
A numbered step in a process control program which contains
parameters for causing a predictable response by the control.
its
own specific
Ramping:
Progressing from one set point to another set point over a periid of time.
Range:
Minimum and maximum operating limits of a sensor or controller.
Rate:
Anticipatory action that senses the rate of change of temperature and
compensates to minimize overshoot. Also “derivative.”
Rate Band:
The area above and below set point where the rate (derivative) function occurs.
Available in certain VVattow controls at a value of 1 to n times the proportional
band.
Recycle:
Program option in some microprocessor-based temperature
the entire program indefinitely. Also “continuous loop.”
controls to repeat
Reference junction:
Synonymous with cold junction. See “Cold junction.”
Remote - Hold:
The Remote - Hold input from a user-supplied switch closure will halt a Series
1500 program and cause the PROG HALT LED to flash. Opening the switch
causes the 1500 to resume the program where it left off.
Reset:
Same as “auto-reset” and “integral.”
Reset
wind-up
Inhibit:
Synonymous with anti-reset. See “Anti-reset.”
Glossary, Appendix
WATLOW Series 1500 User' s Manual
87
