949-1239-3
20
Rev. 10/98
is reset to zero when the input type is changed, or when decimal
position is changed in T/C or RTD ranges. Changing decimal
position in current or voltage ranges will not reset InPC.
FiLt
Digital Filter: Select OFF, 1 to 99. In some cases the time constant
of the sensor, or noise could cause the display to jump enough
to be unreadable. A setting of 2 is usually sufficient to provide
enough filtering for most cases, (2 represents approximately a 1
second time constant). When the 0.1 degree resolution is se-
lected this should be increased to 4. If this value is set too high,
controllability will suffer.
LPbr
Loop Break Protection: Select OFF, 1 to 9999 seconds. If, during
operation, the output is minimum (0%) or maximum (100%), and
the input moves less than 5°F (3°C) or 5 counts over the time set
for LPbr, the LOOP bAd message will appear. This condition can
also be routed to an Alarm Condition if alarms are present and
turned On (see ALbr in the secure menu). The loop break error can
be reset by pressing the ENTER key when at the LPbr menu item.
The INDEX & ENTER keys may also be used.
POL
Process Output Low (936): Select -450°F, -260°C, or -1999
counts to 50 degrees or counts less than POH.
POH
Process Output High (936): Select from 50 degrees or counts
greater than POL to +9990°F, +5530°C, or 9990 counts. A
voltage output is scalable from 0 to 10 VDC that represents the
Process Variable. To properly scale the output, the values for
POL and POH must be calculated. The simplest example is an
output of 0 to 10 VDC from 0 to 200°. In this example POL=0 and
POH=200. To Calculate POL and POH for other ranges use the
following:
K = (Highest desired temperature - Lowest desired temperature)
/ (Maximum desired voltage - Minimum desired voltage)
POH = ((10 - Maximum desired voltage) * K) + Highest desired
temperature
POL = ((Minimum desired voltage - 0) * K) - Lowest desired
temperature
LOrE
Local / Remote Status (992): Select LOC or rE.
LOC
Write commands from the host computer are rejected.
rE
Write commands from the host computer are accepted. The
control will also look to the No Activity Timer (nAt) setting to
see if regular host computer commands are required. See
nAt and CFLt (Page 27) for additional information.
