West Control Solutions MRC 7000 Profiler Manual - Manual (Page 72)

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Input Correction
This parameter is adjustable from -300 to 300 units and is used as a method to compensate
for a linear sensor error. Factory default is 0=no correction. Display code iCi1 and iCi2.
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 which is an even strattle of the setpoint. 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 stabilizes too
low, increase the manual set. Integral action, and conversely reset-windup inhibit apply over
the same process value range regardless of the manual reset value. Display code rSEt.
Pen Action on Power Up
This parameter specifies whether the pen, on a power-up will drive to the "Home Position"
(center of chart), then return to its correct postion. This is done as a cal check. Settings are
0=go to "home" and 1=remain in last position prior to power down. Default is 0.
Platen
The flat surface in the instrument upon which the chart rotates.
Position Proportioning Sensitivity
A percentage of the first output proportional band width (Pb1).
Process Filter Factor
This parameter is adjustable from 1 to 20 which represents the number of scans per second
of the process variable that are averaged together before updating the process value used for
control purposes. The factory default value is 1 = no filtering. Display code PFF.
Process Retransmission Output
Allows re-transmission of the process variable. Factory default is 0 = not selected. Display
code Pout. If selected, must be assigned to a current output and scaled using Process Output
upper and lower values.
Process Output Upper and Lower Values
(Used in conjunction with process retransmission output)
These parameters specify the process value range over which the assigned current output will
vary in a linear manner from 100% to 0%. If the process value is greater than Pou the output
will be 100%. If the process 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 parameter is adjustable from 0 to 100 units and is used to round the process value to the
nearest value specified. This is for display only and does not affect the recorded value or
control action. Intended for use where the engineering units span is large, to reduce display
fluctuation. Factory default is 0 = no rounding. Display code Prnd. (e.g. Prnd = 3, Process
Value = -6, -3, 0, 3, 6, 9....)
Proportional Band (PB)
This parameter is adjustable from 1 to 3000 units (not Percent of span) and represents the
process value range where the proportional output is at a percentage of the full output.
Instructions for determining Pb are given in Section 4.3 (page 48) . Factory default is 100
units. Display code Pb1 and Pb2.
Ramp
A Ramp is the section of a profile segment where the setpoint value is being changed from
the initial value to the value selected over the time period selected. The first Ramp of a profile
will take the process value at the time the profile was started as the initial setpoint value.