SMAR FI302, Operation, Maintenance & Instruction Manual

Page: 31 / 40

Section 4
4.1
Maintenance Procedures
General
SMAR FI302 Fieldbus to Current 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 PROBABLE SOURCES OF TROUBLE
NO QUIESCENT
CURRENT
Converter Fieldbus Connections
Check wiring polarity and continuity.
Power Supply
Check power supply output. The voltage at the FI302 Fieldbus terminals must be between
9 and 32 VDC.
Electronics Circuit Failure
Check circuit boards for defect by replacing them with spare ones.
NO
COMMUNICATION
Network Connection
Check network connections: devices, power supply and terminators.
Network Impedance
Check network impedance (power supply impedance and terminators).
Converter Configuration
Check configuration of communication parameters of converter.
Network Configuration
Check communication configuration of the network.
Electronics Circuit Failure
Try to replace the converter circuit with spare parts.
INCORRECT
OUTPUTS
Output Terminals Connection
Check wiring polarity and continuity.
Power Supply
Check power supply output. The voltage at the output terminals of FI302 must be
between 3 and 45 VDC.
Load Resistance
Load resistance must be between 0 and 2000
Ω
. Note that the maximum value depends
on output power supply voltage.
Calibration
Check calibration of converter.