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STT700 Series HART/DE Option User’s Manual
Revision 1
Sensor2 excess
LRV correct
Applied input 2 value
and measured value
differ by more than
1.5% span at low
calibration point
This will be set when difference between applied Input 2 LRV
value and measured value exceeds 1.5% of span
Sensor2 excess
URV correct
Applied input 2 value
and measured value
differ by more than
1.5% span at high
calibration point
This will be set when difference between applied Input 2 URV
value and measured value exceeds 1.5% of span
Input1 Out Of
Range
Measured value of
Sensor1 is out of range
Input 1 temperature is greater than Sensor 1 URL or less than
Sensor 1 LRL
Set when the input at first sensor is either under range or over
range
Input2 Out Of
Range
Measured value of
Sensor2 is out of range
Input 2 temperature is greater than Sensor 2 URL or less than
Sensor 2 LRL.
Set when the input at second sensor is either under range or
over range
Watchdog reset
Watchdog has reset (it
may be due to FW
failure or HW failure)
Controller watchdog has reset
Supply Voltage
Fault
MCU or DAC
Reference voltages are
beyond limits
This is set when one of the supply voltages (DAC Loop / MCU)
in the device is outside its specification limits. Check the
transmitter supply voltage
SIL Diagnostics
RAM/NVM database
corrupt
Advance diagnostics data is corrupted. Power cycle the device
9.2 DE Diagnostic Details
Table 22 – DE lists and describes the DE critical and non-critical DE diagnostic details.
Table 22
– DE Critical and Non-Critical Diagnostic Details
Fault
MCT/SCT 3000
message
POSSIBLE CAUSE
Resolution
Critical
Diagnostics
Self-test fail at
power up.
The device has detected
corruption in a RAM or ROM
memory location. Or The device
has detected an interruption in the
proper flow of functional
operations.
Try to restart the device. If the
status persists, contact your
vendor.
Isolated
Microprocessor
communication
failure
The loop current value is greater
than actual required value. This
might be due to some component
is damaged and taking more
current than expected. The loop
current value is below the actual
required value.
Power cycle the device. Check
the power supply and loop
resistance are within
specifications. If they are, then
contact your vendor.
Open circuit
detected at input
(Input1- open/short,
suspect input)
Bad sensor wire connection.
Verify the applicable sensor
wiring and check the sensor for
failure.