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6
Service
6.1
Operating Faults
6.2
Error Messages
Classification of
degree of severity
© Landis+Gyr AG
This chapter describes the necessary servicing work after the appearance
of operating faults or error messages.
If the liquid crystal display is illegible or the data readout does not function,
the following points should first be checked:
1.
Is the network voltage present (supply fuses intact and test terminals
closed)?
2.
Is the maximum permissible ambient temperature exceeded?
3.
Is the plastic viewing window over the face plate clean (not scratched,
painted over, misted over or soiled in any way)?
Danger of short-circuits
Never clean soiled meters under running water or with high pressure de-
vices. Water penetration can cause short-circuits. If the meter is heavily
soiled, it should be de-installed if necessary and sent to an authorised
service centre, so that a new plastic viewing window can be fitted.
If none of the points listed is the cause of the fault, the meter should be dis-
connected, removed and sent to the responsible service and repair centre
(according to section 6.3 "Repairing Meters").
The meters regularly perform an internal self-test. This checks the correct
function of all important parts.
In the event of a serious error detected (fatal or critical error according to
classification in the following degrees of severity), the meters display an
error code. This error code appears as an eight-digit figure together with
"F.F" or "FF" in the display, depending on the parameterisation and signifi-
cance of the error. The error code is always included in the readout log
(error code F.F(00000000) = no error).
The degree of severity of an error occurring is assessed as follows:
A fatal error indicates a severe problem, which prevents the meter main-
taining measuring operation, e.g. a defective hardware component. The
meter stops its operation and the error code is displayed permanently. The
meter must be exchanged.
A critical error indicates a severe problem, but with which the meter conti-
nues to function and measurement is still possible. The data are stored in
the memory and suitably marked in case of doubt. After a critical error, the
error code is displayed until acknowledged with the display key or the error
register is reset, e.g. via the electrical interface. Depending on the type of
the error this can cyclically occur again, since with the acknowledgement
the error cause is not repaired. The meter must be exchanged as soon as
possible.
Non-critical errors can influence the meter functions (temporarily or per-
manently). These errors are recorded in the error register. The meter re-
mains serviceable and need not normally be exchanged.
D000030110 d – E650 Series 3 (ZMD400AT/CT, ZFD400AT/CT) – User Manual
Service
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