SMAR TT301 - Troubleshooting Transmitter Issues

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".