Honeywell UDC2800 User Manual

Function
Prompt
Selections or
Range of
Setting
Parameter Definition
of the measured variable for which a proportional
controller will produce a 100 % change in its output.
Gain 1 is the ratio of output change (%) over the
measured variable change (%) that caused it.
G = 100% / PB%
where PB is the proportional band (in %)
If the PB is 20 %, then the Gain is 5. And, at those
settings, a 3 % change in the error signal (SP-PV) will
result in a 15 % change in the controller's output due to
proportional action. If the Gain is 2, then the PB is
50%.
Also defined as "HEAT" Gain on Duplex models for
variations of Heat/Cool applications.
Rate 1 Min 0.00 to
10.00
minutes
Rate action, in minutes, affects the controller's output
whenever the deviation is changing; and affects it more
when the deviation is changing faster.
Also defined as "HEAT" Rate on Duplex models for
variations of Heat/Cool applications.
Reset
Mins/Rpt 1
or
Reset
Rpts/Min 1
0.02 to
50.00
Reset Mins/Rpt 1 = Reset in Minutes per Repeat
Reset Rpts/Min 1 = Reset in Repeats per Minute
Reset (or Integral Time) adjusts the controller's output
in accordance with both the size of the deviation (SP–
PV) and the time that it lasts. The amount of the
corrective action depends on the value of Gain. The
Reset adjustment is measured as how many times
proportional action is repeated per minute or how many
minutes before one repeat of the proportional action
occurs.
Used with control algorithm PID A or PID B.
Also defined as "HEAT" Reset on Duplex models for
variations of Heat/Cool applications.
77
Chapter 4 - Configuration

Honeywell UDC2800 Specifications

General

Control Modes	PID, ON/OFF, Manual
Mounting	Panel Mount
Display	Dual 4-digit LED
Input Types	Thermocouple, RTD, mA, mV, V
Output Types	Relay
Power Supply	100-240 VAC, 50/60 Hz
Communication	RS-485 Modbus RTU
Enclosure Rating	NEMA 4X