Honeywell UDC3500 Product Manual page 129

Function Prompt
Lower Display
BURNOUT3
10/05
Selections or
Range of Setting
Upper Display
NONE
UP
DOWN
NO FS
UDC3500 Universal Digital Controller Product Manual
Parameter
Definition
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—If Input 3 is being used in the
Control Algorithm (such as the PV or RSP input
parameter), then the pre-configured Failsafe output
(selected in the CONTROL Set up Group) is applied
when a failed input is detected (does not apply for an
input out of range). Diagnostic message IN3 FAIL is
intermittently flashed on the lower display.
UPSCALE BURNOUT—Forces the Input 3 signal to
the full-scale value when the sensor fails. Diagnostic
message IN3 FAIL intermittently flashed on the lower
display.
The controller remains in Automatic control mode
and adjusts the controller output signal in response
to the full scale Input 3 signal developed by the
Burnout circuitry.
DOWNSCALE BURNOUT—Forces the Input 3
signal to the lower range value when the sensor
fails. Diagnostic message IN3 FAIL intermittently
flashed on the lower display.
The controller remains in Automatic control mode
and adjusts the controller output signal in response
to the lower range Input 3 signal developed by the
Burnout circuitry.
NO FAILSAFE—This selection does not provide
input failure detection and should only be used when
a thermocouple input is connected to another
instrument that supplies the Burnout current. (For
this selection, no burnout signal is sent to the
sensor.)
ATTENTION The Thermocouple Health feature is
disabled when NO FS is configured.
Configuration
115