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the system.
TROUBLESHOOTING
Table 6 is intended to serve as an aid in locating the
cause of a system malfunction.
Record all faults on the Fault Record Sheet at the
back of this manual.
REPLACEMENT PARTS
The R8471B Controller is not designed to be repaired
by the customer in the field. If a problem should
develop, first carefully check for proper wiring,
programming and calibration. If it is determined that
the problem is caused by an electronic defect, the
device must be returned to the factory for repair.
Problem
No faceplate indicators
illuminated.
FAULT LED on,
digital display blank.
F91 to F98 Status
F92 Status
F94 Status
F96 Status
F97 Status
F70 Status
F60 Status
F50 Status
F40 Status
F30 Status
F20, F21 Status
F22, F23 Status
F24 Status
F10 Status
2.1
NOTE
NOTE
Table 6—Troubleshooting Guide
Possible Cause
1. Wiring to external power source.
2. Input power failure.
1. Power-up time delay (up to 5 minutes).
2. If condition continues after 5 minutes, repeat power-up. If problem continues, replace controller.
1. Initialization failure. Repeat power-up. If successful, re-program and re-calibrate. If not, replace
controller.
1. Sensor failure (during startup). Current is over 35 ma or below 2 ma.
1. RAM failure. Return controller to factory for repair.
1. Input power problem (should be 18 to 32 volts). Check operation of power source and power wiring.
1. Controller type invalid. Error in data from RAM. Return controller to factory for repair.
1. External reset activated for over 15 seconds. Check external switch and wiring.
1. Input power out of tolerance. Check operation of power source and power wiring.
1. Internal power supply problem. Replace controller.
1. Sensor output (after startup) is over 35 ma or below 2 ma. Check sensor/transmitter wiring and
calibration.
2. Faulty sensor. Replace and calibrate.
3. Faulty transmitter. Replace and calibrate.
1. Negative zero drift. Calibrate sensor.
2. Faulty sensor. Replace and calibrate.
3. Faulty transmitter. Replace and calibrate.
1. Calibration error. Re-calibrate.
1. Sensor sensitivity out of tolerance. Calibrate transmitter. If problem continues, replace sensor and
calibrate.
1. Wrong gas for zero calibration.
2. Background gas affecting the zero calibration.
3. Sensor zero input over limit, re-calibrate transmitter.
1. Sensor reaching end of life - no problem at present time. Be prepared to replace sensor at next
calibration (calibration attempt might fail).
When replacing a controller, be sure that the
jumper plugs and rocker switches of the replace-
ment are the same as the original. Remove
power before removing the device from the
mounting cage or plugging in the replacement
unit.
The sensing element assembly is not intended to be
repaired. When calibration can no longer be properly
performed, the assembly must be replaced. The
frequency of replacement will be determined by the
amount and type of contamination present at the
particular installation.
An adequate supply of spare sensing element
assemblies should be kept on hand for field
replacement. For maximum protection against
contamination and deterioration of the sensing
element, they should not be removed from the original
protective packaging until the time of installation.
Sensing elements should be stored at a temperature
22
95-8401
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