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Instruction Manual
IB-106-300NH Rev. 4.3
May 2005
Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 6-7
World Class 3000
6-6 IFT PROBLEM
When an IFT problem is suspected, look at the
LED on the microprocessor board. The LED
may be OFF, ON, or flashing.
Refer to Table 6-4 to troubleshoot IFT related
problems.
Table 6-4. IFT Troubleshooting
Problem
Cause
Corrective Action
IFT LED is OFF. IFT failure.
Fuse fault.
Check fuses on power supply board. Replace fuses as needed.
1. Power fault.
Check line voltage. Correct or turn main power ON.
2. Power supply fault.
Check voltage test points on the microprocessor board. Replace power supply board if needed.
3. Microprocessor board fault.
Replace microprocessor board.
IFT LED is steady ON. Heater or cell wiring problem.
1. Faulty wiring.
Check thermocouple and heater wires and connections for continuity. Repair as needed.
2. Jumpers set up wrong. JM1 on interconnect board, JM6 on microprocessor board, or JM9 and JM10
on power supply board are configured incorrectly.
Check that jumpers are set up as follows:
• Without an HPS, JM1 and JM6 should be installed.
• With a 115 V probe heater, JM9 is installed.
• With a 44 V probe heater, JM10 is installed.
3. Status line is “OFF”.
Turn OFF IFT power and restart. If light stays ON and both wiring and jumpers are OK, then re-
place the microprocessor board.
Faulty GUI or LDP (IFT LED is Flashing).
1. Microprocessor is normal, but front panel indicators are not working properly.
Check connections to GUI or LDP, and repair or replace as needed.