Emerson Rosemount CT5100, Reference Manual

Page: 122 / 179

11.8 Visual examination
If the BIST fails to identify the problem, the next step is a visual examination of the
Rosemount CT5100(Ex).
Procedure
1. Open the door of the electrical compartment and remove the top cover.
Refer to Removing the top cover .
2. Visually examine the exterior of the analyzer for signs of damage.
3. Perform a visual inspection of the optical and electrical components inside the
analyzer.
Refer to
Figure 3-5 .
4. If any loose connections are found in the electrical compartment, refer to the wiring
diagrams ( Engineering drawings ) to identify and repair the connection.
5. Refit the top cover and close the electrical compartment door.
11.9 Functional failure diagnostics
If the Built-in-Self Test and the visual examination fail to identify the fault, perform the
failure diagnostics and recommended actions.
11.9.1 No illuminated LEDs on Power supply unit (PSU) when
analyzer switched ON.
Recommended actions
1. Check mains power is available.
2. If OK, replace PSUs.
11.9.2 Nothing powers up when connected to mains
Recommended actions
1. Check AC fuses (number 1 and number 2)
2. Replace if necessary.
11.9.3 Only MOXA and BEKA powers up
Condition
The startup screen displays BEKA; all other electronic modules remain unpowered.
Recommended actions
1. Check the 12 V PSU is working (LED illuminated).
2. If the 12 V PSU is not working, replace it.
Troubleshooting and diagnostics Reference Manual
October 2019 00809-0100-4512
122 Rosemount CT5100(Ex)