Local Setpoint Second Local Setpoint Third Local Setpoint Remote Setpoint Computer Setpoint

Selecting manual or automatic mode

An alternate action switch places the controller in the Automatic or Manual mode of operation. Switching between manual and automatic will be bumpless, except when PD+MR algorithm is selected.

Table 5-9 includes procedures for selecting automatic or manual mode and changing the output while in manual.

Table 5-9 Procedure for Selecting Automatic or Manual Mode

Step

1

2

3

4

Operation

Selecting

Automatic

Mode

Selecting Manual Mode

Adjust the

Output in

Manual Mode

Return to

Automatic

Mode

Press

MANUAL

AUTO

MANUAL

AUTO

or

MANUAL

AUTO

Action

until “A” indicator is ON.

The controller regulates its output to maintain the PV at the desired setpoint.

Upper Display

shows the PV value

Lower Display

shows SP and the setpoint value

The deviation bargraph indicates the PV deviation from the setpoint.

The annunciators indicate whichever setpoint is in use:

SP 2SP 3SP

RSP

CSP

until “MAN” indicator is ON.

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.

Upper Display

shows the PV value

Lower Display

shows OUT and the output value in (%).

The deviation bargraph indicates the PV deviation from the setpoint.

to adjust the output value while in manual mode.

Upper Display

shows the PV value

Lower Display

shows OUT and the output value in %.

The “A” indicator will appear indicating Automatic mode.

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Honeywell UDC 3300 Selecting manual or automatic mode, SP 2SP 3SP RSP CSP