Honeywell UDC2500 - Page 85

Configuration
4/07 UDC2500 Universal Digital Controller Product Manual 71
Function Prompt
Lower Display
Selection or Range of Setting
Upper Display
English Numeric
Code
English Numeric
Code
Parameter
Definition
TIMR
12
TIMER—Contact closure starts timer, if
enabled. Reopening the switch has no
effect.
TUNE
13
INITIATE LIMIT CYCLE TUNING—Contact
closure starts the slow tuning process. The
lower display shows DoSLOW. Opening the
contact has no effect.
INIT
14
SETPOINT INITIALIZATION—Contact
closure forces the setpoint to the current PV
value. Opening the contact has no effect.
RSP
15
TO REMOTE SETPOINT—Contact closure
selects the Remote setpoint.
MNLT
16
MANUAL LATCHING—Contact closure
transition forces the loop to Manual mode.
Opening the switch has no effect. If the M-A
RESET key is pressed while the switch is
closed, the loop will return to Automatic
mode.
TRAK
17
OUTPUT TRACKS INPUT 2—Contact
closure allows Output to track Input 2. While
the switch is open, the output is in
accordance with its pre-defined functionality.
When the switch is closed, the output value
(in percent) will track the Input 2 percent of
range value. When the switch is reopened,
the output will start at this last output value
and normal PID action will then take over
control. The transfer is bumpless.
STRT
18
PV HOTSTART—Contact closure starts the
SP Ramp or SP Program at the original
selected starting Setpoint Value that existed
at the time that the SP Ramp or Program
was first started. Opening contact has no
effect. This configuration must be selected
prior to the first time the SP Ramp or
Program is placed in the RUN mode, as
otherwise the unit will not be able to capture
the initial Setpoint value. This selection
allows the unit to retain the initial Setpoint
value even if power to the unit is lost.
When the STATE selection in the SP Ramp
or Program Set Up group is set to HOLD and
the digital input contact is left closed, then
when the end of the program or ramp is
reached, the program or ramp will