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168 UDC 3300 Controller Product Manual 4/00
5.10 Using Two Sets of Tuning Constants
Introduction
You can use two sets of tuning constants for single output types and
2-loop or cascade control, and choose the way they are to be switched.
(Does not apply for Duplex control.)
The sets can be:
• keyboard selected,
• automatically switched when a predetermined process variable value
is reached,
• automatically switched when a predetermined setpoint value is
reached.
The following procedures show you how to:
• select two sets or gain scheduling,
• set the switch-over value,
• set tuning constant value for each set, and
• switch between two sets via the keyboard (without automatic
switchover)
Select two sets or gain
scheduling
The procedure in Table 5-16 tells you how to select two sets or gain
scheduling.
Table 5-16 Procedure for Selecting Two Sets of Tuning Constants
Step Operation Press Action
1
Select Control
Set Up group
SET UP
until you see:
CONTROL
Lower Display
SET UP
Upper Display
CONTROL2
Lower Display
SET UP
Upper Display
for Loop 1 for Loop 2or
2
Select
PID SETS
function
FUNCTION
LOOP 1/2
until you see:
Lower Display
Upper Display
PID SETS
Available selections
are listed below
1 ONLY—1 set of constants
2KEYBD—2 sets, keyboard selectable
2 PVSW—2 sets, auto switch at PV value
2 SPSW—2 sets, auto switch at SP value
GAIN S—Gain used in control algorithm
calculations can be pre-entered into eight
user-defined segments, with each segment
applied over a user-defined PV range. Refer
to Section 3 – Configuration under Tuning
Set Up group to set Gain segment values
and PV range values.
or
to select the type of PID SET.