Product manual

Monitoring and Operating the Controller
4/07 UDC2500 Universal Digital Controller Product Manual 101
4.8.2 What happens when you change modes
Table 4-8 Changing Control Modes (Dual Display Only)
Control Mode Definition
Manual to
Automatic Local
Setpoint
The Local Setpoint is usually the value previously stored as the Local Setpoint.
PV tracking is a configurable feature which modifies this. For this configuration,
when the controller is in manual mode, the local setpoint value tracks the process
variable value continuously.
Manual or Auto
Local to Automatic
Remote SP
The Remote Setpoint uses the stored ratio and bias to calculate the control
setpoint.
Automatic Remote
Setpoint to Manual
or Auto Local
Setpoint
If configured for local setpoint tracking, RSP, when the controller transfers out of
remote setpoint the last value of the remote setpoint is inserted into the local
setpoint.
If LSP tracking is not configured, the local setpoint will not be altered when the
transfer is made.
4.9 Setpoints
Introduction
You can configure the following setpoints for the UDC2500 controller.
• A Single Local Setpoint
• 2 Local Setpoints
• a Local Setpoint and a Remote Setpoint
Refer to Subsection 3.11 – Control Set Up Group for configuration details.
Changing the Setpoints
Table 4-9 Procedure for Changing the Local Setpoints
Step Operation Press Result
1
Select the
Setpoint
Lower
Display
Lower
Display
Lower
Display
Until you see:
Upper Display = PV
Lower Display = SP or 2L (Value)
2
Change the
Value
or
To change the Local Setpoint to the value at which you want
the process maintained. The display “blinks” if you attempt
to enter setpoint values beyond the high and low limits..
3
Return to PV
Display
Lower
Display
Lower
Display
Lower
Display
To store immediately or will store after 30 seconds.