Rosemount 8712C - Software Testing Procedures; Flowtube Troubleshooting

5-5
Troubleshooting
SOFTWARE TESTING
Analog Output Test
The analog output test allows you to drive the transmitter output to a
desired electrical current output on terminals 7 and 8. This capability
allows you to check the entire current loop prior to start-up. On the LOI
the test will quit after five minutes if the transmitter is not manual
returned to normal operation.
Pulse Output Test
The pulse output test allows you to drive the frequency output at
terminals 5 and 6 to a desired value. This capability allows you to check
auxiliary equipment prior to start-up. On the LOI the test will quit
after five minutes if the transmitter is not manually returned to
normal operation.
Transmitter Test
The transmitter test initiates a series of diagnostic tests that are not
performed continuously during normal operation. It performs the
following tests:
•Display Test
•RAM Test
•PROM Test
During the entire test, all outputs are driven to full-scale, 20 mA and
1,000 Hz. The test requires about ten seconds to complete.
FLOWTUBE
TROUBLESHOOTING
The Model 8712C/U/H, Model 8732C, or Model 8742C Magnetic
Flowmeter Transmitters perform self diagnostics on the entire
magnetic flowmeter system: the transmitter, the flowtube, and the
interconnecting wiring. While most of the diagnostics are related to the
transmitter microprocessor, some tests diagnose specific
flowtube problems.
If a problem with the flowtube is identified, the following chart (Table
5-3 on page 5-6) can assist in troubleshooting the flowtube.
NOTE
Before performing any of the flowtube tests, cut off power and
disconnect all connections inside the flowtube junction box.
Take all readings from inside the junction box with a multimeter.
Readings taken at the transmitter terminals may provide incorrect or
inconclusive information and should be avoided. A flowtube circuit
diagram is provided in Figure 5-1 on page 5-7.
HART Fast Keys
1, 4, 4, 3
LOI Key Aux. Function
HART Fast Keys
1, 4, 3, 3, 3
LOI Key Aux. Function
HART Fast Keys
1, 2, 1, 1, 2
LOI Key Aux. Function