MIC 1400 ManualEdition 1 39
Appendix A
Glossary of Terms
Input Filter Time Constant
This parameter is used to filter out any extraneous impulses on the process
variable. This filtered PV is used for all PV-dependent functions (control,
alarm, etc). The time constant is adjustable from 0.0 seconds (off) to 100.0
seconds, in 0.5 second increments. Default value is 2.0 seconds. Display
code is FiLt.
Input Correction
This parameter is used to modify the actual process variable and is adjust-
able in the range ± input span. Default value is 0. Display code is iCor.
Proportional Band 1
This parameter is the portion of the input span over which the Output 1
power level is proportional to the displayed process variable value. It may
be adjusted in the range 0.0% (ON/OFF) to 999.9%. Default value is 5.0%.
Display code is Pb1. The function is illustrated in Figure A-1, page 49.
Proportional Band 2
This parameter is the portion of the input span over which the Output 2
power level is proportional to the displayed process variable value. It may
be adjusted in the range 0.0% (ON/OFF) to 999.9%. Default value is 5.0%.
Display code is Pb2. In Figure A-1 (page 49), Proportional Band 2 is
shown (a) with a nonzero value (Case 1 and Case 2) - PID Control, and (b)
with a zero value (Case 3) - ON-OFF control.
Automatic Reset (Integral)
This parameter is used to bias the proportional output(s) to compensate for
process load variations. It is adjustable in the range 1 second to 99 min-
utes 59 seconds per repeat and OFF (value greater than 99 minutes 59
seconds). Decreasing the time increases the Reset. This parameter is not
available if Pb1 is set to 0. Default value is OFF. Display code is ArSt.
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