SMAR LD291, Operation And Maintenance Instruction Manual

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LD291 - Operation and Maintenance Instruction Manual
5.2
ERROR MESSAGES POTENTIAL SOURCE OF PROBLEM
COLD START
•
Start-up or Reset due to power supplies failure.
OUTPUT FIXED
•
Output in Constant Mode.
•
Transmitter in Multidrop mode.
OUTPUT SATURATED
•
Pressure out of calibrated Span or in fail-safe state (Output current in 3.8 or 20.5 mA).
SV OUT OF LIMITS
•
Temperature out of operating limits.
•
Temperature sensor damaged.
PV OUT OF LIMITS
•
Pressure out of operation limits.
•
Sensor damaged or sensor module not connected.
•
Transmitter with false configuration.
LOWER RANGE VALUE TOO
HIGH
•
Lower value exceeds 24% of the Upper Range Limit.
LOWER RANGE VALUE TOO
LOW
•
Lower value exceeds 24% of the Lower Range Limit.
UPPER RANGE VALUE TOO HIGH
•
Upper value exceeds 24% of the Upper Range Limit.
UPPER RANGE VALUE TOO LOW
•
Upper value exceeds 24% of the Lower Range Limit.
UPPER & LOWER RANGE
VALUES OUT OF LIMITS
•
Lower and Upper Values are out of the sensor range limits.
SPAN TOO SMALL
•
The difference, between the Lower and Upper values is less than the 0.75 x (minimum
span).
APPLIED PRESURE TOO HIGH
•
The pressure applied was above the 24% upper range limit.
APPLIED PRESURE TOO LOW
•
The pressure applied was below the 24% lower range limit.
EXCESS CORRECTION
•
The trim value entered exceeded the factory-characterized value by more than 10%.
PASSED PARAMETER TOO
LARGE
•
Parameter above operating limits.
PASSED PARAMETER TOO
SMALL
•
Parameter below operating limits.
Table 5.1 - Error Messages and Potential Source
Diagnostic with the Transmitter
Symptom: NO LINE CURRENT
Probable Source of Trouble :

Transmitter Connections
•
Check wiring polarity and continuity;
•
Check for shorts or ground loops;
•
Check if the power supply connector is connected to main board.

Power Supply
•
Check power supply output. The voltage must be between 12 and 45 Vdc at transmitter
terminals.

Electronic Circuit Failure
•
Check the main board for defect by using a spare one.
Symptom: NO COMMUNICATION
Probable Source of Trouble
:

Terminal Connections