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Monitoring and Operating the Controller
4/07 UDC2500 Universal Digital Controller Product Manual 115
4.17 Setting Failsafe Mode
Introduction
You can set the Failsafe Mode to be Latching or Non-Latching.
Set Failsafe Mode
Table 4-23 Procedure for Setting a Failsafe Mode
Step Operation Press Result
1
Select Control
Set-up Group
SetupSetup
Until you see:
Upper Display = SET
Lower Display = CONTRL
2
Select Failsafe
Function Prompt
FunctionFunctionFunction
You will see:
Upper Display =
LACH (Controller goes to manual and output goes to
failsafe value)
NO L (Controller mode does not change and output goes
to failsafe value)
Lower Display = FSMODE
3
Select a value
or
To select a failsafe mode in the upper display.
4
Return to Normal
Display
Lower
Display
Lower
Display
Lower
Display
At power up, the output will go to the value set.
4.18 Setpoint Rate/Ramp/Program Overview
Introduction
The Setpoint Ramp configuration group lets you enable and configure any of the
following:
• SPRATE – a specific rate of change for any local setpoint change. (Subsection
4.20)
• SPRAMP – a single setpoint ramp that occurs between the current local setpoint and
a final local setpoint over a time interval of 1 to 255 minutes. (Subsection 4.19)
• SPPROG – a ramp/soak profile in a 12-segment program. (Subsection
4.21)
This section explains the operation of each selection and configuration reference where
necessary.
PV Hot Start
This is a standard feature. At power-up, the setpoint is set to the current PV value and
the Rate or Ramp or Program then starts from this value.