Honeywell HC900 - Page 297

Function Blocks
PID Function Block
Revision 11 HC900 Hybrid Control Designer Function Block Reference Guide 283
2/07
Disable
N/A Disables PV Adaptive tune Click on radio button to
select.
PV Adaptive
Tuning
Enable
N/A
This method adapts a tuned
process to changing system
characteristics over time. When the
PV deviates from the SP by a
certain amount for any reason.
(Note 3 – Page
H284)
Click on radio button to
select.
Tuning Criteria Normal
N/A Conservative tuning designed to
calculate critically damped tuning
parameter values that produce
minimal overshoot.
Fast
N/A
More aggressive tuning than
Normal, designed to calculate
under damped parameter values
providing faster control to the
setpoint but may have some
overshot.
Click on radio button to
select.
Duplex Tuning
(Active for
Algorithm DUPA
or DUPB on
General Tab with
Cycle Tuning)
Disable
Manual
Automatic
N/A
Disable -Duplex type tuning is
disabled and simplex type tuning is
used instead.
Manual - Tuning must be initiated
manually for each side. The
current LSP or RSP value is used
as the target SP for the desired
heat or cool side tuning. For the
heat side, the output cycles
between 50 percent and the high
output limit and for the cool side the
output cycles between 50 percent
and the low output limit. Tuning
values are calculated and stored
only for the side tuned.
Heat and Cool tuning are
sequentially performed
automatically. During the operation
of this tuning the target SP used is
the mid point between the high
output limit and 50 percent for the
heat side and the low output limit
and 50 percent for the cool side.
During tuning for each side the
cycling of the output results in the
PV oscillating around the target SP
value. From the data gathered
during the oscillations, tuning
values are calculated and stored for
each side. After tuning on both
sides is completed, the process SP
is returned to the value of the last
SP used prior to the initiation of the
tuning procedure.
Click on radio button to
select.