Watlow Ramping and Profiling Microprocessor-Based Control SERIES 1500 User Manual page 88

Restart:
RTD:
Set
point:
conditioner:
Signal
Single .mode
cont rol :
Span:
Switching
sensltlvlty:
Thermal system:
Thermocouple:
Thermocouple
protection:
break
Three mode control:
Time-In-step:
Time Proportioning
Control:
Trlac:
Two posltlon
control:
Warm
Start:
Wet Bulb:
Zero switching:
88
WATLOW Series 1500 User's Manual
To begin to control a thermal system again, after stopping control and holding
the process variable at a fixed value. A "restart" may occur with newly-
programmed information in microprocessor-based controls.
Resistance Temperature Detector. Resistive sensing device displaying linear
resistance versus temperature characteristics. Displays positive temperature
coefficient.
Intended value of the process variable.
An electronic circuit that provides sensor compatibility of the input signal for use
in the control. Includes linearization and/or sensor excitiation.
Proportioning control.
Distance in degrees or other units between the minimum and maximum
operating limits of a sensor or controller.
See "Hysteresis."
A regulated environment consisting of a heat source, heat transfer medium,
sensing device and a process variable control instrument.
Temperature sensing device that is constructed of two dissimilar metals
wherein a measurable, predictable voltage is generated corresponding to
temperature.
Fail-safe operation that assures output shutdown upon an open thermocouple
condition.
Proportioning control with auto-reset and rate.
Time remaining in any given program step.
Action which varies the amount of ON and OFF time when "close" to the set
point, i.e., in the proportional band. This variance is the result of the control
algorithm. In other words, the amount of time the output relay is energized
depends on the system control requirement.
Solid state switching device.
An ON/OFF control.
where
Start-up condition
instrument's memory back-up protection.
Dip Switch #6 in the OFF position gives a "Warm Start."
Half of a wet bulb/dry bulb
Action which provides output switching only at the zero voltage
of the AC line.
all program information is remembered by the
In the Series 1500, powering up
%RH
system, i.e., an RTD with a wet sock.
sensor
with
points
crossing
Glossary, Appendix