Honeywell UDC3500 Product Manual page 144

Configuration
Function Prompt
Lower Display
IN4 LOW
RATIO 4
BIAS IN4
FILTER 4
BURNOUT4
128
Selections or
Range of Setting
Upper Display
–999. To 9999. Floating
(in engineering units)
–20.00 to 20.00
Floats to 3 decimal places
–999. to 9999.
(in engineering units)
0 to 120 seconds
No filter = 0
NONE
UP
UDC3500 Universal Digital Controller Product Manual
Parameter
Definition
INPUT 4 LOW RANGE VALUE—This value in
engineering units is displayed for all inputs but can
only be changed for inputs configured for linear or
square root transmitter characterization.
See the example in IN1 HI
RATIO ON INPUT 4—Select the Ratio value you
want on Input 4.
BIAS ON INPUT 4—Bias is used to compensate the
input for drift of an input value due to deterioration of
a sensor, or some other cause. Select the bias value
you want on Input 4.
Final Input 4 Value = Input 4 * Ratio 4 + Bias 4
FILTER FOR INPUT 4—A software digital filter is
provided for Input 4 to smooth the input signal. You
can configure the first order lag time constant from 1
to 120 seconds. If you do not want filtering, enter 0.
BURNOUT PROTECTION (SENSOR BREAK)—
Provides most input types with upscale or downscale
protection if the input fails.
ATTENTION For Burnout to function properly on
0-20 mA, 0-10 Volt or –1 to +1 Volt input types (or a
0-5V type that uses a dropping resistor), the
dropping resistor must be remotely located (across
the transmitter terminals). Otherwise, the input at the
instrument terminals will always be 0 (i.e., within the
normal operating range) when the sensor opens.
NO BURNOUT—Input 4 display freezes at the last
valid value. If Input 4 is used for PV, then the
instrument assumes its pre-configured Failsafe
Output (selected in the CONTROL Set up Group)
when a failed input condition is detected (does not
apply for an input out of range). Diagnostic message
IN4 FAIL is intermittently flashed on the lower
display.
UPSCALE BURNOUT—Forces the Input 4 signal to
the full-scale value when the sensor fails. Diagnostic
message IN4 FAIL intermittently flashed on the lower
display.
The controller remains in Automatic control mode
and adjusts the controller output signal accordingly.
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