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Maintenance
© Gyr
D000030875 en q
– E350 series 2, 1-phase ZCF100Ax/Cx – User Manual
7
Maintenance
The meter is maintenance-free. The following points should be regularly
checked:
Is the meter dry and clean (particularly display and optical interface)?
Is the meter in operation and serviceable (displayed data reasonable)?
Are all seals undamaged?
Is there an error recorded based on periodical internal self
-
tests since
the previous check (check on the display or readout list)?
Have the values of the energy registers changed within reasonable
limits since the last data readout (no unauthorised manipulations)?
Continue with section 6.3 "Repairing Meters" in case of irregularities.
7.1
Meter Testing
The meters are calibrated during manufacturing. A later recalibration on is
not possible. Meter tests should be performed at periodic intervals
according to the valid national regulations (either on all meters or on
specific random samples). For this purpose, the meters must be removed
as described in section 4.5 "Disconnecting the Meter" and replaced by a
substitute meter for the duration of the test.
7.1.1
Higher Register Resolution
The meter features a
certification display sequence
which allows registers
to be displayed with 3 decimal places. See 5.2.5 "Display Sequence".
This sequence is entered by pressing the display button for more than 5 s.
It is exited again if the display button is not pressed for a time between 0
and 30 minutes (default 30 minutes) determined by parameterisation.
+P
+Q
L
1
k
h
This mode is used for accelerated product certification regarding
accordance between register value change and the number of impulses at
the test LED, which can now be done with 0.5 kW in about 5 minutes. It is
indicated by a flashing decimal point.
7.1.2
Measuring Times
For technical reasons higher measuring deviations can occur during short-
term measurements. It is therefore recommended to use sufficiently long
measuring times in order to achieve the required accuracy.
Table of required measuring times:
Current
A
Measuring uncertainty 0.2%
cos
=1
Measuring uncertainty 0.1%
cos
=1
0.2
70 s
4.5 min
0.5
20 s
45 s
1
20 s
20 s
Display example
ZCF
U
n
=230 V
