SMAR TT301, Operation, Maintenance & Instruction Manual

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TT301 - Operation and Maintenance Instruction Manual
5.2
DIAGNOSTIC MESSAGES POTENTIAL SOURCE OF PROBLEM
OUTPUT SATURATED

Primary variable out of calibrated Span (Output current in 3.8 or 20.5
mA, XMTR mode only).
SV OUT OF LIMITS

Temperature out of operating limits.

Temperature sensor damaged.
PV OUT OF LIMITS

Input signal out of operating limits.

Sensor damaged.

Transmitter with false configuration.

PV out of range limits (see table).
Table 1 - Diagnostics with the Configurator
Troubleshooting with Transmitter

Symptom: NO LINE CURRENT
Probable Source of Trouble :

Transmitter Connections

Check wiring polarity and continuity.

Check for shorts or ground loops.

Power Supply

Check power supply output. The voltage at the TT301 terminals must be between 12 and 45 Vdc,
and the ripple less than 0.4V.

Electronic Circuit Failure

Check the main board for defect by replacing it with a spare one.
Symptom: NO COMMUNICATION
Probable Source of Trouble :

Terminal Connections

Check terminal interface connections.

Check if the interface is connected to the points [COMM] and [-] or in the line between the
transmitter and the load resistor.

Check if the interface is model IF2 (for HART Protocol).

Transmitter Connections

Check if connections are as per wiring diagram.

Check line resistance; it must be equal to or greater than 250 Ohm, between the transmitter and the
power supply.

Power Supply

Check output of power supply. The voltage at the TT301 terminals must be between 12 and 45V,
and ripple less than 0.4V.

Electronic Circuit Failure

Locate the failure by alternately replacing the transmitter circuit and the interface with spare parts.

Transmitter Address

In On Line Multidrop item check if the address is "0".