Det-Tronics R8471NH34001,2,3 Single Channel Gas Controller, NH3 - Manual (Page 24)

95-8529 1.1 22
TROUBLESHOOTING
Table 8 is intended to serve as an aid in locating the
cause of a system malfunction. If the problem cannot
be corrected, contact the factory for assistance.
NOTE
Record all faults on the Fault Record Sheet at
the back of this manual.
Problem Possible Cause
No faceplate indicators 1. Wiring to external power source.
illuminated. 2. Input power failure.
FAULT LED on, digital 1. Power-up time delay (up to 5 minutes).
display blank. 2. If condition continues after 5 minutes, repeat power-up. If problem continues,
replace controller.
F91 to F98 Status 1. Initialization failure. Repeat power-up. If successful, re-program and re-calibrate. If
not, replace controller.
F92 Status 1. Sensor failure (during startup) - current is over 35 ma or below 2 ma.
F94 Status 1. RAM failure. Repeat power-up. If not successful, return to factory for repair. Do not
press RESET button. If RESET is pressed, recalibrate and check setpoints.
F96 Status 1. Input power problem (should be18 to 32 volts). Check operation of power source
and power wiring.
F97 Status 1. Controller type invalid. Error in data from RAM. Repeat power-up. If not
successful, return to factory for repair. Do not press RESET button. If RESET is
pressed, recalibrate and check setpoints.
F70 Status 1. External reset activated for over 15 seconds. Check external switch and wiring.
F60 Status 1. Input power out of tolerance. Check operation of power source and power wiring.
F50 Status 1. Internal power supply problem. Replace controller.
F40 Status 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.
F30 Status 1. Negative zero drift. Calibrate sensor.
2. Faulty sensor. Replace and calibrate.
3. Faulty transmitter. Replace and calibrate.
F20, F21 Status 1. Calibration error. Re-calibrate.
F22, F23 Status 1. Sensor sensitivity out of tolerance. Calibrate transmitter.If problem continues,
replace sensor and calibrate.
F24 Status 1. Wrong gas for zero calibration.
2. Background gas affecting the zero calibration.
3. Sensor zero input over limit, re-calibrate transmitter.
F10 Status 1. Sensor reaching end of life - no problem at present time. Be prepared to replace
sensor at next calibration (calibration attempt may fail).
Table 8—Troubleshooting Guide