Service
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– E650 Series 4 – ZMD400AT/CT, ZFD400AT/CT – User Manual
© Gyr
6
Service
This section describes the necessary servicing work after the appearance
of operating faults or error messages.
6.1
Operating faults
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 faceplate 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
devices. Water penetration can cause short-circuits. If the meter is heavily
soiled, it should be uninstalled, 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
disconnected, removed and sent to the responsible service and repair
centre (according to section 6.3 "Repairing meters").
6.2
Error messages
The meters regularly perform an internal self-test. This checks the correct
function of all important parts.
In case of a serious error detected (fatal or critical error according to
classification in the following degrees of severity), the meters displays an
error code. This error code appears as an eight-digit number together with
"F.F" or "FF" in the display (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
maintaining 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
continues 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 button or
until 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 usually not repaired. The meter must
in this case be exchanged as soon as possible.
Non-critical errors
can influence the meter functions (temporarily or
permanently). These errors are recorded in the error register. The meter
remains serviceable and normally needs not to be exchanged.
If nothing else is specified in the following description of the error groups,
the error messages can only be deleted with formatted commands (see
section 5.8 "Input of formatted commands"). If the error occurs again, the
Classification of
degree of severity
Deleting error
messages
