Micro Motion Fisher Rosemount RFT9739, Инструкция по эксплуатации

Страница: 82 / 130

72
RFT9739 Rack-Mount Transmitter Instruction Manual
Troubleshooting
continued
Fault detection indicates an interruption in the functional integrity of the
sensor and the transmitter, including the sensor pickoff coils, drive coil,
and RTD. Faults, such as a short or an open circuit, are detected by the
HART device.
The transmitter runs continuous self-diagnostics. If these diagnostics
reveal a failure, the HART device displays an error message. Self-testing
allows the transmitter to check its own circuitry.
The transmitter works with a Micro Motion flow sensor to provide flow
information. Therefore, many of the troubleshooting checks pertain only
to the sensor. However, a HART Communicator, the ProLink program,
and AMS software enable the user to perform other tests:
• Performing an
mA output test forces the transmitter to produce a user-
specified current output of 0 to 22 mA.
• Performing a frequency/pulse output test forces the transmitter to
produce a user-specified frequency output between 0.1 and
15,000 Hz.
• Performing an mA output trim allows adjustment of the primary and
secondary mA outputs against a highly accurate external standard
such as a digital multimeter (DMM) or receiving device.
Perform mA trim and/or test procedures, if necessary, as described in
the HART Communicator or ProLink software instruction manuals, or in
AMS on-line help.
• If the transmitter is in security mode 8, mA output test, mA output trim,
and frequency/pulse output test procedures cannot be performed. For
more information, see "Security mode 8", page 7.
• If the transmitter is in fault condition, an mA output test cannot be
performed.
• If the transmitter is not properly connected to a sensor, or if the sensor
is in fault condition, an mA output test cannot be performed.