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154 UDC 6300 Process Controller Product Manual 1/03

5.6 Operating Modes

Available modes

The controller can operate in any of five basic modes:

• Manual (One or Two Loops)

• Automatic with Local Setpoint (One or Two Loops)

• Automatic with Remote Setpoint (One or Two Loops)

• Manual (Cascade)

• Automatic (Cascade)

Manual and Automatic with Local set point are standard features and

Automatic with Remote Setpoint is optional.

Mode definitions

Table 5-7 lists the five modes and their definitions.

Table 5-7 Operating Mode Definitions

Operating Mode Definition

MANUAL In Manual mode the operator directly controls the

controller output level.

When switched to manual mode, the controller holds

its output at the last value used during automatic

operation and stops adjusting the output for changes

in setpoint or process variable.

Instead, the configured High and Low Output Limits

are disregarded and you adjust the output to the limits

allowed by the output type by changing the value

shown in the lower display. See "Selecting Manual or

Automatic” in this subsection.

AUTOMATIC with

LOCAL SETPOINT

In automatic local mode, the controller will operate

from the local setpoint and automatically adjust the

output to maintain the setpoint at the desired value.

In this mode you can adjust the setpoint. See

Subsection 5.7 - “Setpoints”.

AUTOMATIC with

REMOTE SETPOINT

In automatic remote mode, the controller will operate

from the setpoint measured at input 2, 3, 4, or 5.

Adjustments are available to ratio this input and add a

constant bias before it is applied to the control

equation. See Section 3 - Configuration, Set up group

“Control”.

Not available in CASCADE.

MANUAL (CASCADE) In the manual cascade mode, both control loops are

in manual although there is only one output active.

This mode is used to bring both loops into a

reasonable operation area, at which point the unit is

placed into the Automatic Cascade Mode.

If Loop 1 is placed in Manual control mode, then

Loop 2, if in Auto, is then placed in a Pseudo-manual

mode thereby eliminating output bumps when Loop 1

is returned to Automatic Control Mode.

AUTOMATIC

(CASCADE)

In Automatic Cascade mode, there are two control

loops, with one loop's output acting as the setpoint for

the second control loop. There is only one physical

output in this mode.

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