Honeywell UDC2500 manual Control Modes, Control Mode Definitions

Monitoring and Operating the Controller

4.8 Control Modes

ATTENTION

After changing a Local Setpoint value, if no other key is pressed, it then takes a minimum of thirty (30) seconds elapsed time before the new value is stored in non-volatile memory. If controller power is removed before this time, the new setpoint value is lost and the previous setpoint value is used at power-up. If, after changing the LSP value, another key is pressed, then the value is stored immediately.

4.8.1 Mode Definitions

	Table 4-7 Control Mode Definitions
Control Mode	Definition
AUTOMATIC with In automatic local mode, the controller operates from the local setpoints and
LOCAL	automatically adjusts the output to maintain the PV at the desired value.
SETPOINT	In this mode you can adjust the setpoint.
	See Subsection 4.9 - Setpoints.

AUTOMATIC with In automatic remote mode, the controller operates from the setpoint measured at the

REMOTE	remote setpoint input. Adjustments are available to ratio this input and add a
SETPOINT	constant bias before it is applied to the control equation.
(optional)	See Subsection 3.9 or 3.10, Input 1 or Input 2.
MANUAL	In the manual mode, the operator directly controls the controller output level. The
(optional)	process variable and the percent output are displayed. The configured High and
	Low Output Limits are disregarded and the operator can change the output value,
	using the increment and decrement keys, to the limits allowed by the output type
	(0 % to 100 % for a time proportioning output or –5 % to 105 % for a current output).
	Manual Mode not available with Single Display model.

100 UDC2500 Universal Digital Controller Product Manual 4/07