SMAR if303, Руководство по эксплуатации, техническому обслуживанию и инструкциям, Страница: 41 / 52

Section 4
4.1
MAINTENANCE PROCEDURES
General
SMAR
IF303
Current to Profibus PA 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 SOURCE OF PROBLEM
No Quiescent Current
Converter Fieldbus Connections
Check wiring polarity and continuity.
Power Supply
Check power supply output. The voltage at the IF303 Fieldbus terminals must be
between 9 and 32 VDC.
Electronic Circuit Failure
Check the boards for defect by replacing them with spare ones.
No Communications
Network Connections
Check the network connections: devices, power supply, couplers, links, 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.
Incorrect Input
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 IF303 has a 100 ohms plus 0.8 V input impedance.
Calibration
Check calibration of IF303 and the conventional transmitters.