04/08 UDC3200 Universal Digital Controller Operator Manual 29
3.4 SP Ramp Set Up Group
Function
Prompt
Lower Display
Selections or
Range of Setting
Upper Display
Parameter Definition
SINGLE SETPOINT RAMP—Make a selection to enable or disable
the setpoint ramp function. Make sure you configure a ramp time
and a final setpoint value.
SP Programming must be disabled.
SP RAMP
SP Program
must be
disabled for SP
Ramp prompts
to appear
DISABLE
ENABLE
DISABLE SETPOINT RAMP—Disables the setpoint ramp option.
ENABLE SETPOINT RAMP—Allows the single setpoint ramp
prompts to be shown.
TIME MIN
0 to 255 minutes
SETPOINT RAMP TIME—Enter the number of minutes desired to
reach the final setpoint. A ramp time of “0” implies an immediate
change of setpoint.
FINAL SP
Within setpoint
limits
SETPOINT RAMP FINAL SETPOINT—Enter the value desired for
the final setpoint. The controller will operate at the setpoint set here
when ramp is ended.
ATTENTION If the ramp is on HOLD, the held setpoint can be
changed by the and keys. However, the ramp time remaining
and original ramp rate is not changed. Therefore, when returning to
RUN mode, the setpoint will ramp at the same rate as previous to
the local setpoint change and will stop if the final setpoint is
reached before the time expires. If the time expires before the final
setpoint is reached, it will jump to the final setpoint.
ATTENTION SP RAMP and SP RATE will cause the SP portion
of Accutune to abort. PV Tune will continue to function normally.
Ramp is placed into HOLD while tuning (TUNE configuration).
HOTSTART
DISABLE
ENABLE
DISABLE—LSP1 is used as the initial ramp setpoint.
ENABLE—Current PV value is used as the initial ramp setpoint.
SP RATE
DISABLE
ENABLE
SETPOINT RATE—Lets you configure a specific rate of change for
any local setpoint change.
DISABLE SETPOINT RATE—Disables the setpoint rate option.
ENABLE SETPOINT RATE—Allows the SP rate feature.
SP Rate operates only when both SP Ramp and SP Programing
are in HOLD mode or when both SP Ramp and SP Programming
are disabled.
EU/HR UP
0 to 9999 in
engineering units
per hour
RATE UP—Rate up value. When making a setpoint change, this is
the rate at which the controller will change from the original
setpoint up to the new one. The ramping (current) setpoint can be
viewed as SPn in the lower display.
Entering a 0 will imply an immediate step change in Setpoint (i.e.,
no rate applies).
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