Section 4
4.1
MAINTENANCE
General
NOTE
Equipment installed in hazardous atmospheres must be inspected in compliance with the IEC60079-17
standard.
SMAR IF302 Current to Fieldbus Converters are extensively tested and inspected before delivery to
the end user. Nevertheless, during their design and development, consideration was given to the
possibility of repairs by the end user, if necessary.
In general, it is recommended that the end user do not try to repair printed circuit boards. Instead,
he should have spare circuit boards, which may be ordered from SMAR whenever necessary.
Troubleshooting
Symptom: No Quiescent Current
Probable Sources of Trouble:
Converter Fieldbus Connections
Check wiring polarity and continuity.
Power Supply
Check power supply output. The voltage at the IF302 Fieldbus terminals must be between 9 and 32
VDC.
Electronic Circuit Failure
Check the boards for defect by replacing them with spare ones.
Symptom: No Communication
Probable Source of Trouble
Network Connections
Check the network connections: devices, power supply, and terminators.
Network Impedance
Check the network impedance (power supply impedance and terminators).
Transmitter Configuration
Check configuration of communication parameters of converter.
Network Configuration
Check communication configuration of the network.
Electronic Circuit Failure
Try to replace the converter circuit with spare parts.
Symptom: Incorrect Inputs
Probable Source of Trouble:
Input Terminals Connection
Check wiring polarity and continuity.
Conventional Transmitter
Verify if the conventional transmitter is working properly or if it has the necessary voltage.
Remember that IF302 has a 100 ohms plus 0.8 V input impedance.
Calibration
Check calibration of IF302 and the conventional transmitters.
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