Honeywell UDC3500 - Page 168

Configuration
152 UDC3500 Universal Digital Controller Product Manual 3/07
Function Prompt
Lower Display
Selections or
Range of Setting
Upper Display
Parameter
Definition
DEV 2
DEVIATION (PROCESS VARIABLE MINUS
SETPOINT FOR LOOP 2)—Represents –100 % to
+100 % of the selected PV span in engineering
units.
Zero deviation will produce a center scale (12 mA or
50 %) output. A negative deviation equal in
magnitude to the Output High Scaling Factor will
produce a low-end output (4mA or 0 %) output. A
positive deviation equal in magnitude to the Output
High Scaling Factor will produce a high-end output
(20 mA or 100 %).
FOR EXAMPLE: Configuration is as follows:
Input 1 = Type T High Thermocouple
PV range = –300 °F to +700 °F
PV span = 1000 °F
Deviation Range = –1000 to +1000 °F = 2000 °F
Second Current Output Low Scale Value = 0.0
Second Current Output High Scale Value = 1000
C2 Range = 4-20 mA
If PV = 500 °F and SP = 650 °F
then Deviation Display = –150 °F, which is
–150 / 2000 = –7.5% of the Deviation Range, so
Second Current Output = 50% – 7.5% = 42.5%
which is 0.425 X 16 mA + 4 mA = 10.8 Ma
OUTPUT 2
OUTPUT FOR LOOP 2—Represents the displayed
controller Loop 2 output in percent (%).
ATTENTION Also see CBOUTL2 when using a
characterizer on the Loop 2 output value.
SP LP2
SETPOINT FOR LOOP 2—Represents the value of
the setpoint currently in use by Loop 2 (LSP1, LSP2,
LSP3, RSP or CSP) and is shown in the same units
as those used by the PV for Loop 2.
LSP1LP2
LOCAL SETPOINT ONE FOR LOOP 2—Output
represents Loop 2 Local Setpoint 1 regardless of
active setpoint.
RSP LP2
REMOTE SETPOINT FOR LOOP 2—Represents
the configured Loop 2 RSP regardless of the active
SetPoint for Loop 2.