Function Blocks
TPSC (3POS) Function Block
418 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
Table 122 TPSC Tuning tab configuration parameters
Properties Group Parameter Index # Parameter Description Value or Selection
Tuning Constants Prop Band
0
PB1 or
Gain1
Proportional Band (PB) - is the
percentage of the range of the
measured variable for which a
proportional controller will produce
a 100 % change in its output.
0.1 to 1000
or
Gain
37
PB2 or
Gain2
Gain - is the ratio of output change
(%) over the measured variable
change (%) that caused it.
G =
100 %
PB %
where PB is the Proportional Band
(in %)
0.1 % to 1000 %
ATTENTION: Enter
values for tuning set
1 and tuning set 2 in
specified fields.
Reset
Minutes
or
Repeats per
Minute
2
Reset1
or
39
Reset2
RESET (Integral Time) - adjusts the
controller’s output according to both
the size of the deviation (SP-PV)
and the time it lasts. The amount of
corrective action depends on the
value of Gain.
The reset adjustment is measured
as how many times proportional
action is repeated per minute
(
Repeats/minute) or how many
minutes before one repeat of the
proportional action occurs
(
Minutes/repeat).
0.02 to 50.00
Rate
Minutes
1
Rate1
or
38
Rate2
RATE action, in minutes affects the
controller’s output whenever the
deviation is changing; and affects it
more when the deviation is
changing faster.
0 or 0.1 to 10.00
minutes
0 = OFF
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