Watlow Series 920 Microprocessor-Based Ramping Control - Manual (Page 73)

RS H:
RT: Represents the rate at which the set point changes in a given
time.
RT C: The Rate (derivative) Cooling function detemined by how fast
the error being corrected is increasing. Expressed in minutes.
This parameter will not appear if OUT = HT, or PB C = 0.
RTD:
(parameter)
Allows the operator to change the input gain of the RTD input
for different curves. This parameter will not appear if the input
type is not RTD whole or RTD tenths, or DIP switch #7 is ON
RT H: The Rate (derivative) for the Heating function that is deter-
mined by how fast the error being corrected is increasing.
Expressed in minutes. This parameter will not appear if OUT =
CL or PBH = 0.
Reference
junction:
Reset:
Synonymous with cold junction. See “Cold junction.”
Control action that automatically eliminates offset, or “droop,”
between set point and actual process temperature. Also
“integral.”
Reset windup
inhibit:
RETURN:
RTD:
Synonymous with anti-reset. See “Anti-reset.”
From any RETURN parameter, you can go back to SYSTEM.
Resistance Temperature Detector. Resistive sensing device
displaying resistance versus temperature characteristics.
Displays positive temperature coefficient.
SE: Represents the set endpoint that the Series 920 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 920.
Set point:
SETPOINT:
Intended value of the process variable.
One of six step types under the PROGRAM menu of the Series
920. Can be programmed as a file or a step to achieve or
maintain a set point.
SP: 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 920, 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 920 to
be edited or reviewed.
STOP: One of six step types under the PROGRAM menu of the Series
920, that will indicate the end of any file.
Appendix WATLOW Series 920 User’s Manual 73
A reset (integral) heating control action that automatically
eliminates offset, or “droop”, between set point and actual
process temperature in a proportional control. Expressed in
minutes. This parameter will not appear if OUT = CL or PB H
is set to 0.