7.2 Trouble-shooting and remedy
All instruments undergo various stages of quality control during production.
The last of these stages is the wet calibration carried out on state-of-the-art
calibration rigs. The following summary helps to identify possible causes of error
during normal measurement.
Warning!
This error diagnosis cannot be carried out with Ex instruments as they must be
opened and thus the ignition protection type is no longer present.
Warning!
Type of error Remedy ( Step 1 ➔ 2 ➔ ... )
↓↓
Does a message indicating
error, alarm or status appear
on the display?
Appropriate measures can be carried out for every
message:
– Error messages F: .... → see page 90
– Alarm messages A: .... → see page 92
– Status messages S: .... → see page 93
For error messages it is possible to call up further sources
of error via the diagnosis function (7).
No display and no output
signal.
1 Check the power supply → Terminals 1, 2
2 Check the fuse → see page 23, 24
85...260 V AC: 1 A slow-blow
20...55 V AC and 16...62 V DC: 2.5 A slow-blow
3 Replace electronics → see page 96
The display is blank, with
outputs still functioning.
1 Check the ribbon cable connector of the display
module → see page 96 (No. 3b)
2 Replace display module → see page 96
3 Replace electronics → see page 96
Display text is shown in a
foreign or a language that is
not understood.
Switch off the power supply. Switch on the instrument again
while simultaneously pressing the
6
keys. The display text
is then shown in English at maximum contrast.
No current or pulse output
signals despite display
showing measured values?
1 Check the ribbon cable connector to the terminal
compartment → see page 96 (No. 8)
2 Replace electronics → see page 96
Does the instrument show
negative flow values although
the fluid in the piping is flowing
forward?
1 Remote version → switch off the power supply, check
the wiring (see page 26) and if necessary change round
Terminals 41 and 42.
2 Change the setting in the function “FLOW DIRECTION”
accordingly → see page 75
Is the display unsettled
despite continuous flow?
1 Check ground and potential equalisation
→ see page 28
2 Check to see if air bubbles are in the fluid.
3 Increase the time constant for the current output
→ see page 51
4 Increase the display damping for flow → see page 68
continued on next page
Promag 33 7 Trouble-shooting, Maintenance and Repairs
Endress+Hauser 87
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