Promass 40 9 Trouble-shooting
Endress+Hauser 35
9 Trouble-shooting
9.1 Trouble-shooting instructions
Always start trouble-shooting with the checklists below, if faults occur after start-up or
during operation. The routine takes you directly to the cause of the problem and the
appropriate remedial measures.
Check the display
No display visible and no
output signals present.
1. Check the power supply → terminals 1, 2
2. Check the power line fuse
→ Page 47
85...260 V AC: 0.8 A slow-blow / 250 V
20...55 V AC and 16...62 V DC: 2 A slow-blow / 250 V
3. Measuring electronics defective
→ order spare parts → Page 44
No display visible, but out-
put signals are present.
1. Check whether the ribbon cable connector of the display module is
correctly plugged into the amplifier board
→ Page 46
2. Display module defective
→ order spare parts → Page 44
3. Measuring electronics defective
→ order spare parts → Page 44
Measured value indicated,
but no signal at the current
or pulse output
Measuring electronics defective
→ order spare parts → Page 44
Error messages on display
Errors which occur during commissioning or measuring operation are displayed immediately.
Error messages consist of a variety of icons. The meanings of these icons are as follows:
– Error type: S = system error, P = process error
– Error message type:
= fault message, ! = notice message
– MEDIUM INHOM. = error designation, e.g. fluid is not homogeneous
– 03:00:05 = duration of error occurrence (in hours, minutes and seconds)
– # 702 = error number
Caution:
• Also observe the information on Page 26 ff.!
• The measuring system interprets simulations and positive zero return as system errors, but displays
them as information messages only.
Error number:
No. 001 – 400
No. 601 – 699
System error (device error) has occurred
→ Page 36
Error number:
No. 500 – 600
No. 700 – 750
Process error (application error) has occurred
→ Page 39
Other error (without error message)
Some other error has
occurred.
Diagnosis and rectification → Page 41
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