Monitoring and Operating the Controller
248 UDC3500 Universal Digital Controller Product Manual 3/07
Associated
Prompts
Contents Definition
program.
KEYRESET
(RERUN)
Rerun current
cycle
RERUN CURRENT CYCLE—When enabled, this selection
allows you to reset the program via the keyboard to the
beginning of the current cycle. The Recycle value is not
affected. The program mode (RUN or HOLD) is not affected.
HOTSTART Hot Start
This function determines whether LSP1 or PV is used as the
setpoint when the program is initially changed from HOLD to
RUN. The selections are:
DISABLE = When the program is initially changed from HOLD
to RUN the present LSP1 value is captured as
the default setpoint. If the program is terminated
or the power cycled before the program has
completed, the LSP1 is used as the control
setpoint. The beginning segment uses this value
as the initial ramp setpoint.
ENABLE = When the program is initially changed from HOLD
to RUN the present PV value is captured and
used as the beginning setpoint value for the ramp
segment. If the program is terminated before
completion, the setpoint value will revert back to
the PV value captured at the initial HOLD to RUN
transition. If the power is cycled before program
completion, upon power-up the setpoint is set to
the PV value at power-up and when the program
is restarted that setpoint value is used initially.
RAMPUNIT
SEGxRAMP or
SEGxRATE
Ramp time or
rate segments
A ramp segment is the time it will take to change the setpoint
to the next setpoint value in the program.
Ramps are odd number segments (1, 3, . . . 19). Segment #1
will be the initial ramp time.
Ramp time is determined in either:
TIME - Hours.Minutes Range = 0-99hr.59 min.
or
RATE - EU/MIN or EU/HR Range = 0 to 999
This selection of time or rate is made at prompt “RAMPUNIT”.
Set this prompt before entering any Ramp values.
ATTENTION Entering “0” implies an immediate step change
in setpoint to the next soak.
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