Monitoring and Operating the Controller
210 UDC3500 Universal Digital Controller Product Manual 3/07
4.10.4 Using BLENDED TUNE at start-up for Duplex (Heat/Cool)
When DUPLEX has been configured for DISABLE. This is the preferred selection for
Heat/Cool applications, which use a highly insulated chamber (a chamber which will lose
heat very slowly unless a cooling device is applied). Only one local setpoint (LSP 1) is
needed for this selection.
This selection results in performance tuning over the full range utilizing both Heat and
Cool outputs to acquire blended tune values that are then applied to both Heat and Cool
tuning parameters. Both PID sets are set to the same values.
Table 4-11 Procedure for Using BLENDED TUNE at Start-up for Duplex Control
Step Operation Press Result
1
Configure LSP1
Lower
Display
Until SP (Local Setpoint 1) shows
in the lower display.
2
or
Until the Setpoint is to the desired
value.
3
Switch to
“Automatic” Mode
Man/Auto
Until the “A” indicator is lighted (on
controllers with Manual option).
4
Show Tuning
Prompt
Lower
Display
Until “TUNE OFF” is shown on
lower display.
5
Initiate Tuning
Select “DO SLOW” or “DO FAST”
in lower display.
6
Tuning in operation
Lower
Display
Upper display will show a “T” as
long as ACCUTUNE process is
operating. When process
completes, tuning parameters are
calculated and lower display will
show “NO TUNE” prompt.
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