Honeywell SLG 700 User Manual page 67

Name (DTM/DD)
Sensor in Low Power
Mode
Reference reflection not
found
Sensor Power Supply
2.5V OSC Fault
Sensor Power Supply
2.5V Fault
Sensor Power Supply
3.3V OSC Fault
Sensor NVRAM corrupt
Comm Module Critical
Failure 2
Program Flow Failure
Revision 5
Description (Cause)
The sensor is in Low Power Mode
designed to handle low range burnout.
Sensor is not able to detect the
reference refection for level
measurement in direct or remote
mount transmitters or process
connector reflection in remote mount
transmitters.
Power Accumulator board is damaged
or malfunctions.
Power Accumulator board is damaged
or malfunctions.
Power Accumulator board is damaged
or malfunctions.
Sensor board NVRAM data has been
corrupted.
This is a roll-up status bit that is set
when any of the following critical status
conditions are present.

Program Flow Failure

Communication Board Vcc ( 3.3V)
Failure

RAM CRC Failure

RAM Walk Test Failure

ROM Failure
Communication firmware Program
Flow Failure. This fault will get set if
any of the critical part of the code is not
executed after expected duration.
SLG 700 Series HART Option User's Manual
Resolution (Steps to take)
The fault is set if any critical faults are
set and device burnout direction (Fail
safe) is low scale (3.5 mA). Please
perform a hard or soft reset.
Upload an echo curve and confirm
that the reference and process
connector (only for remote mount)
model parameters are set for a good
match with actual reflections. Perform
a soft or hard reset.
Power-cycle the device and if problem
persists replace Sensor housing If
problem still persists replace the
terminal block assembly.
Power-cycle the device and if problem
persists replace Sensor housing. If
problem still persists replace the
terminal block assembly.
Power-cycle the device and if problem
persists replace Sensor housing. If
problem still persists replace the
terminal block assembly.
Use sensor NVRAM corrupt
reset method from host to clear the
sensor NVRAM error.
This method will default the sensor
NVRAM data.
This will reset the critical NVRAM
corruption alarm but the non-critical
not characterized/calibrated alarms
will stay.
If the problem persist then change the
sensor module.
Refer to each condition later in this
table.
Check if any other faults are reported
like DAC faults, if DAC faults are
reported replace the communication
board. If there are no DAC faults,
check the connection between
communication and Sensor housing.
Power cycle the device and if problem
persists replace the Communication
module.
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