Chromalox 6050 User Manual

95
value. It is similar to Retransmit Output 1 Scale Maxi-
mum.
Display code = ro3H, default value = Scale Range Up-
per Limit.
Also refer to Process Variable, Retransmit Output, Re-
transmit Output 3 Scale Minimum, Scale Range Upper
Limit and Setpoint.
Retransmit Output 3 Scale Minimum
Type: General Parameter
Defines the value of the process variable, or setpoint,
at which Retransmit Output 3 will be at its minimum
value. It is similar to Retransmit Output 1 Scale Mini-
mum.
Display code = ro3L, default value = Scale Range
Lower Limit.
Also refer to Process Variable, Retransmit Output, Re-
transmit Output 3 Scale Maximum, Scale Range Lower
Limit and Setpoint.
Reset
Type: Controller Tuning Parameter
-Refer to Automatic Reset.
Reverse Acting
Type: Controller Denition
- Refer to Direct/Reverse Action of Control Output
Scale Range Upper Limit
Type: General Parameter
For linear inputs, this parameter is used to scale the
process variable into engineering units. It defines the
displayed value when the process variable input is at
its maximum value. It is adjustable from -1999 to 9999
and can be set to a value less than (but not within 100
units of) the Scale Range Lower Limit, in which case
the sense of the input is reversed.
For thermocouple and RTD inputs, this parameter is
used to reduce the effective range of the input. All
span related functions work from the trimmed input
span. The parameter can be adjusted within the limits
of the range selected by Configuration Mode param-
eter inPt. It is adjustable to within 100 degrees of the
Scale Range Lower Limit.
Display code = rUL, default value = 1000 for linear in-
puts or range maximum for temperature inputs.
Also refer to Input Span, Process Variable and Scale
Range Lower Limit.
Scale Range Lower Limit
Type: General Parameter
For linear inputs, this parameter can be used to display
the process variable in engineering units. It defines the
displayed value when the process variable input is at
its minimum value. It is adjustable from -1999 to 9999
and can be set to a value more than (but not within 100
units of) the Scale Range Upper Limit, in which case
the sense of the input is reversed.
For thermocouple and RTD inputs, this parameter is
used to reduce the effective range of the input. All span
related functions, work from the trimmed span. The pa-
rameter can be adjusted within the limits of the range
selected by Configuration Mode parameter inPt. It is
adjustable to within 100 degrees of the Scale Range
Upper Limit.
Display code = rUL, default value = 0 for linear inputs,
or range minimum for temperature inputs.
Also refer to Input Span, Process Variable and Scale
Range Upper Limit.
Secondary Proportional Band
Type: Controller Tuning Parameter
The portion of the input span over which the Secondary
Output power level is proportional to the process vari-
able value. It may be adjusted in the range 0.0% (ON/
OFF) to 999.9%. The Control action for the Secondary
Output is always the opposite of the Primary output.
The Secondary Proportional Band is only applicable
when Dual Control Type is used.
Display value = Pb
-
S, default value = 5.0%.
Also refer to Control Action, Control Type, On-Off Con-
trol, Input Span, Overlap/Deadband, PID, Primary Pro-
portional Band and Tuning.
Self-Tune
Type: Controller Tuning Denition
Self-Tune continuously optimizes tuning while a con-
troller is operating. It uses a pattern recognition algo-
rithm, which monitors the process error (deviation). The
diagram shows a typical application involving a pro-
cess start up, setpoint change and load disturbance.
Figure 44
Self-Tune Operation
Tem
p
erature
Setpoint 1
Setpoint Change
Load Disturbance
Time
Setpoint 2
The deviation signal is shown shaded and overshoots
have been exaggerated for clarity. The Self-Tune al-
gorithm observes one complete deviation oscillation

Chromalox 6050 Specifications

General

Brand	Chromalox
Model	6050
Category	Controller
Language	English