Endress+Hauser Prothermo NMT81 - Page 95

Prothermo NMT81 Diagnostics and troubleshooting
Endress+Hauser 95
Diagnostic
number
Short text Remedy instructions Status
signal
[from the
factory]
Diagnostic
behavior
[from the
factory]
485 Process variable
simulation active
Deactivate simulation C Warning
491 Current output
simulation active
Deactivate simulation C Warning
495 Diagnostic event
simulation active
Deactivate simulation C Warning
538 Configuration Sensor
Unit invalid
1. Check sensor configuration
2. Check device configuration
M Warning
560 Sensor calibration
incomplete
Carry out sensor calibration C Warning
586 Calibration active Calibration in progress, please
wait
C Warning
Diagnostic of process
801 Supply voltage too low Increase supply voltage F Alarm
802 Supply voltage too high Decrease supply voltage S Warning
805 Loop current faulty 1. Check wiring
2. Replace electronics
F Alarm
825 Operating temperature 1. Check ambient temperature
2. Check process temperature
S Warning
969 No element in phase 1. Check device configuration
2. Check water and tank level
M Warning
1)
973 Level invalid 1. Check level source setting
2. Check connected level device
C Warning
1) Diagnostic behavior can be changed.
When using NMT81 in NMT539x compatibility mode, the following error codes respond
to the NMT53x's.
NMT53x error codes to be supported
NMT81
Error code
Short text NMT539
Error
code
Short text Diagnostic
behavior
[from the
factory]
148 Waterbottom connection faulty 43 WB line open F
149 Waterbottom electronics faulty 44 WB line short F
107 Temperature element open 3 Element No.1 open M
108 Temperature element short 4 Element No.1 short M
560 Sensor calibration incomplete 24 Memory defect (ROM) C
109 Test resistance out of range 24 Memory defect (ROM) S
973 Level invalid 24 Memory defect (ROM) C
969 No element in phase 24 Memory defect (ROM) M
485 Process variable simulation
active
24 Memory defect (ROM) C
331 Firmware update failed 24 Memory defect (ROM) F
282 Data storage inconsistent 42 Memory defect (EEROM) F
273 Main electronics defective 42 Memory defect (EEROM) F