Glossary, r - s – Watlow Series 922 User Manual

Page 81

Appendix

WATLOW Series 922 User's Manual

Glossary, R - S

RB1H/RB2H:

A thermal control band for heating in Channel 1 or Channel 2
that defines where the rate (derivative) function begins.

RS1C/RS2C:

Reset (integral) cooling control action for Channel 1 or Channel
2 that automatically eliminates offset, or "droop", between set
point and actual process temperature in a proportional control.
Expressed in repeats per minute.

RS1H/RS2H:

A reset (integral) heating control action for Channel 1 or
Channel 2 that automatically eliminates offset, or "droop,"
between set point and actual process temperature in a
proportional control. Expressed in minutes.

RT1C/RT2C:

The Rate (derivative) Cooling function for Channel 1 or
Channel 2 that is determined by how fast the error being
corrected is increasing. Expressed in minutes.

RT1H/RT2H:

The Rate (derivative) for the Heating function for Channel 1
and Channel 2 that is determined by how fast the error being
corrected is increasing. Expressed in minutes.

Reference
junction:

Synonymous with cold junction. See "Cold junction."

Reset:

Control action that automatically eliminates offset, or "droop,"
between set point and actual process temperature. Also
"integral."

Reset windup
inhibit:

Synonymous with anti-reset. See "Anti-reset."

RETURN:

From any RETURN parameter, you can go back to SYSTEM.

RTD:

Resistance Temperature Detector. Resistive sensing device
displaying resistance versus temperature characteristics.
Displays positive temperature coefficient.

SE1/SE2:

Only appear when in the RUN mode. Represents the set
endpoint of the current step for Channel 1 or Channel 2 that
the Series 922 will try to achieve in the amount of time given.
This will be done linearly, producing a ramp from a beginning
set point to an end set point. Seen only in the RUN mode.

SEC:

The number of seconds that equal total step time to achieve
the temperature of the Series 922.

Set point:

Intended value of the process variable.

SETPOINT:

One of six step types under the PROGRAM menu of the Series
922. Can be programmed as a file or a step to achieve or
maintain a set point.

SP1/SP2:

When in the PROGRAM menu, this is the set point that the
control will try to achieve by the end of the step. When in the
RUN mode it represents the current set point. Its primary
function is as the control point of the closed loop.

SPCLFUNC:

When ACCESS (5) is selected under the SETUP mode of the
Series 922, the Special Function parameters appear. Here you
can select the input type, degrees, output type, auxiliary and
alarm types among others.

STEP:

Represents the current SYSTEM file step of the Series 922 to
be edited or reviewed.

STOP:

One of six step types under the PROGRAM menu of the
Series 922, that will indicate the end of any file.