Setpoint Rate/Ramp/Program Operation
72 UDC2300 Controller Product Manual 12/00
7.2 Setpoint Rate
Introduction
When you have configured a SETPOINT RATE, it will apply immediately to local
setpoint change.
Configuration check
Make sure:
• SPRATE is enabled
• SPRAMP and SPPROG are disabled
• A Rate Up (EUHRUP) or Rate Down (EUHRDN) value has been configured in
Engineering units per hour.
ATTENTION: A value of 0 will imply an immediate change in setpoint, that is, NO
RATE applies. See Subsection 4.6 – Configuration group “SPRAMP” for details.)
Operation
When a change to local setpoint is made, this controller will ramp from the original
setpoint to the “target” setpoint at the rate specified.
The current setpoint value can be viewed at Sn on the lower display.
Power outages
If power is lost before the “target” setpoint is reached, upon power recovery, the
controller powers up with Sn = Current PV value and it automatically “Restarts” from Sn
= current PV value up to the original “target” setpoint.
7.3 Setpoint Ramp
Introduction
When you have configured a SETPOINT RAMP, the ramp will occur between the current
local setpoint and a final local setpoint over a time interval of from 1 to 255 minutes.
You can RUN or HOLD the ramp at any time.
Configuration Check
Make sure
• SPRAMP is enabled
• SP RATE and SPPROG are disabled
• A Ramp Time (TIMIN) in minutes has been configured
• A final setpoint value (FINLSP) has been configured. See Subsection 4.6 –
Configuration group “SPRAMP” for details.
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