Installation and Operation Handbook
Tuning
4.5
GAIN SCHEDULING
Gain scheduling is the automatic transfer of control between one set of PID values and another. In the case of the
2416 controller, this is done at a presettable process value. It is used for the more difficult to control processes
which exhibit large changes in their response time or sensitivity at, for example, high and low temperatures, or
when heating or cooling.
The 2416 has two sets of PID values. You can select the active set from either a parameter in the PID list, or you
can transfer automatically in gain scheduling mode. The transfer is bumpless and will not disturb the process
being controlled.
To use gain scheduling, follow the steps below:
Step1: Enable in configuration level
Gain scheduling must first be enabled in Configuration level. Goto the
Inst
Conf
list, select the parameter
Gsch
, and set it to
YES
.
Once gain scheduling has been enabled, the parameter
G.SP
will appear at the
top of the
Pid
list in
FuLL
access level. This sets the value at which transfer
occurs. PID1 will be active when the process value is below this setting and
PID2 when the process value is above it. The best point of transfer depends on
the characteristics of the process. Set a value between the control regions that
exhibit the greatest change.
Step 3: Tuning
You must now set up the two sets of PID values. The values can be manually set, or automatically tuned as
described earlier in this chapter. When tuning automatically you must tune twice, once above the switching point
G.SP
and again below the switching point. When tuning, if the process value is below the transfer point
G.SP
the
calculated values will automatically be inserted into PID1 set and if the process value is above
G.SP
, the calculated
values will automatically be inserted into PID2 set.
Step 2: Set the transfer point
GSch
YES
G.SP
350
HA025041 issue 12 Aug 14
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