P
AGE
64
Hysteresis
This parameter is adjustable from 0 to 300 units representing the width of the band (half
above and half below setpoint). Used with On-Off or Alarm outputs to reduce cycling. For
instance, with a value of 4 and a setpoint of 70, the output will turn On when the process
variable drops to 68 and stays On until 72 is reached, then turns Off the output. Factory
default is 3. Display code is HySt.
Input Correction
This parameter is used to adjust the process variable value to compensate for sensor errors.
This Program mode parameter is selectable from -300 to + 300 degrees/units. The factory
default is 0.
Manual Reset
This parameter is adjustable from -1500 to 1500 units representing a manual shift of propor-
tional band(s) relative to the normal position. Manual reset is intended to be used when
automatic reset is not used to allow compensation for deviations from setpoint which remain
after the process has stabilized. Factory default is 0. Increasing the value increases the
process variable, i.e. if the process variable stabilized too low, increase the manual set.
Integral action, and conversely reset-windup inhibit apply over the same process value range
regardless of the manuals reset value. Display code rSEt.
Position Proportioning Sensitivity
A percentage of the first output proportional band width (Pb1).
Process Filter Factor
This Program mode parameter is used to dampen the process value used to calculate output
action. The process value is averaged to dampen the control outputs. This parameter is
adjustable from 1 to 20 . Factory default is 1.
Process Retransmission Output (EA Software Option)
This parameter allows for a linear milliamp proportional output relative to the process value.
The current output may be scaled over a range selectable by the user. This output can be
used to supply the process variable signal to remote chart recorders, panel meters, and data
logger instruments.
Process Output Upper and Lower Values (Used in conjunction with process or setpoint
retransmission output)
These parameters specify the process or setpoint value range over which the assigned
current output will vary in a linear manner from 100% to 0%. If the process or setpoint value
is greater than Pou, the output will be 100%. If the process or setpoint value is less than PoL,
the output will be 0%. Factory default values are 2000 for the upper value and 0 for the lower
value. Display codes Pou (upper) and PoL (lower).
Process Rounding
This Program mode parameter is used to determine the step size of the process value that
will be seen on the display. This feature can be used to reduce display fluctuation. This
parameter is adjusted from 1 to 100 degrees/units. The factory default is 1, no rounding (e.g.
Process rounding = 2, Process Value Display - 4, -2, 0, 2, 4, etc.).
Process Variable
The process variable refers to the condition of the process being measured (sensed). The
instrument will accept process inputs other than temperature (pressure, level, flow, etc.).
Proportional Band
This Tune mode parameter selects the span of the proportional output range. This parameter
is adjustable from 1 to 3000 degrees/units. Factory default is 100. If Output 1 is selected as a
proportional output, a display code of Pb1 will be seen. If Output 2 is selected as a propor-
tional output, the display code will be Pb2.
