Honeywell UDC2500 - Manual (Page 114)

Monitoring and Operating the Controller
100 UDC2500 Universal Digital Controller Product Manual 4/07
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
LOCAL
SETPOINT In automatic local mode, the controller operates from the local setpoints and
automatically adjusts the output to maintain the PV at the desired value.
In this mode you can adjust the setpoint.
See Subsection 4.9 - Setpoints.
AUTOMATIC with
REMOTE
SETPOINT
(optional) In automatic remote mode, the controller operates from the setpoint measured at the
remote setpoint input. Adjustments are available to ratio this input and add a
constant bias before it is applied to the control equation.
See Subsection 3.9 or 3.10, Input 1 or Input 2.
MANUAL
(optional) In the manual mode, the operator directly controls the controller output level. The
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.