Honeywell UDC2500 User Manual

Page 80

Configuration

UDC2500 Universal Digital Controller Product Manual

4/07

Function Prompt

Lower Display

Selection or Range of Setting

Upper Display

English

Numeric

Code

English

Numeric

Code

Parameter

Definition

FSMODE 817

FAILSAFE MODE

No L

NON LATCHING—Controller stays in last
mode that was being used (automatic or
manual); output goes to failsafe value.
(NOTE 1, NOTE 2)

LACH

LATCHING—Controller goes to manual
mode; output goes to failsafe value. (NOTE
2)

PBorGN 818

PROPORTIONAL BAND UNITS—Select
one of the following for the Proportional (P)
term of the PID algorithm:

GAIN 0

GAIN selects the unitless term of gain for the
P term of the PID algorithm.
Where: GAIN = 100 % FS
PB%

PB 1

PROPORTIONAL BAND selects units of
percent proportional band for the P term of
the PID algorithm.
Where: PB % = 100 % FS

GAIN

MINRPM 819

RESET UNITS—Selects units of minutes per
repeat or repeats per minute for the I term of
the PID algorithm.

20 Repeats per Minute = 0.05 Minutes per
Repeat.

MIN 0

MINUTES PER REPEAT—The time
between each repeat of the proportional
action by reset.

RPM 1

REPEATS PER MINUTE—The number of
times per minute that the proportional action
is repeated by reset.

NOTE 1: Does not apply to Three Position Step Control.

NOTE 2: If controller is in Manual upon failure, output will maintain its value at time of failure.

NOTE 3: These selections appear when the Control Algorithm is selected for 3PSTEP.

NOTE 4: The local setpoint will automatically adjust itself to be within the setpoint limit range. For
example, if SP = 1500 and the SP HiLIM is changed to 1200, the new local setpoint will be 1200.

NOTE 5: Reset limits and Dropoff are not displayed when Three Position Step Control is configured.