Honeywell SMV 3000 User Manual page 76

6.8 TempConf Configuration - PV3,
T/C Fault Detect
d Factory setting.
Background
64
Select whether to turn on the function for T/C or RTD fault detection.
ON – Any RTD or T/C lead breakage initiates a critical
status flag.
d
OFF – Break in RTD sensing lead or any T/C lead initiates
a critical status flag.
You can turn the transmitter's temperature sensor fault detection function
ON or OFF through configuration.
With the detection ON, the transmitter drives the PV3 output to
failsafe in the event of an open RTD or T/C lead condition. The
direction of the failsafe indication (upscale or downscale) is
determined by the failsafe jumper on the PWA, (See Subsection 8.3).
When fault detection is set to OFF, these same failsafe conditions
result in the transmitter for an open RTD sensing lead or any T/C lead.
But when an open RTD compensation lead is detected, the transmitter
automatically reconfigures itself to operate without the compensation
lead. This means that a 4-wire RTD would be reconfigured as 3-wire
RTD, if possible and thus avoiding a critical status condition in the
transmitter when the transmitter is still capable of delivering a
reasonably accurate temperature output.
SMV 3000 Transmitter User's Manual
Continued
Continued on next page
1/99