Manual
Glossary
This glossary includes general thermal system control terms; not all are used with the Series 1500.
Actual display data:
Displayed
information
which gives the operator/programmer real or “actual”
data, i.e., actual time of day, actual process temperature, or actual process
relative
humidity,
etc. See “Programmed display data.”
Alarm:
Anti-reset:
Automatic
prompts:
A signal, generated by
the
Series
1500,
warningthe
has exceeded or fallen
below the
alarm
set point.
operator
that
the
process
Control
band.
that inhibits automatic reset action outside of the proportional
Data entry points where a microprocessor-based control “prompts” or asks the
operator/programmer for
information
input. A Series 1500
prompt
has two
letters.
Auxiliary
outputs:
ON/OFF outputs per channel, one of which may be designated as an alarm.
An unprogrammed step will take auxiliary output status from the programmed
step to that just prior to it.
Auto-reset:
Same as “reset” and
“integal.”
Control action that automatically eliminates
offset, or “droop,” between set point and actual process temperature.
Change Data Mode:
(CHG
DATA)
-
Set up the program step information for the Serles 1500,
including
step type, set points, step duration,
"wait
for"
or
“jumploop”
conditions, and auxiliary output status.
Change Parameter
Mode: (CHG
PARA)
-
Set up the system step information for the Series 1500, including
real time, high and low range limits, alarm types, alarm points,
PID
parameters,
and RS-422 address.
Channel:
Closed loop:
A distinct electronic control
bop or path
for reading input data
communicating information
to an output device or devices.
and
Control system that has a sensing device for
process
variable feedback.
Cold
junction:
Point of connection between thermocouple wires and the electronic instrument.
Cold
junction
compensation:
Electronic means used to subtract the effect of the cold, or reference junction
temperature from a
thermocouple’s
electro-chemical
circuit.
Cold start:
A “clean,” or completely cleared-of-user-programmed information, start-up
condition. In the Series 1500, powering up with DIP Switch
#6
in the “ON”
position gives a “Cold Start.”
Cycle time:
The time necessary to complete a full ON-through-OFF period in a time
proportioning control system.
DATA:
Values (for a
specific
Series 1500 parameter) which appear in the control’s
DATA display. DATA may be changed in the CHG DATA mode with the UP/
DOWN keys.
Dead Band:
Glossary,
Appendix
Represents the area where no heating or cooling takes place in a heat/cool
proportional control.
WATLOW Series 1500 User’s Manual
85