Maintenance; Meter Tests; Measuring Times; Optical Test Outputs - Landis+Gyr ZMQ202 User Manual

7

Maintenance

Note
7.1

Meter Tests

7.1.1

Measuring Times

7.1.2

Optical Test Outputs

7.1.3

Test Transmitting Contacts

H 71 0200 0215 f en - ZMQ202 / ZFQ202 - User Manual
Maintenance
Based on our experience as long-term meter manufacturers, electronic
meters require no maintenance.
Meter modifcation
No conversion, modification or retrofitting of the meter is allowed unless
stated in this chapter!
A meter accuracy check should be performed periodically according to
national regulations, usually every 8 years.
When testing the meter, the measuring conditions and the measuring
points must follow the IEC meter standards.
Use test equipment according to regulations for Cl.0.2S.
Metering Point
all-phase 1%In cos ϕ = 1
2%In cos ϕ = 0.5
100%In cos ϕ = 1
single phase
100%In cos ϕ = 0.5
The green optical test outputs supply pulses at a frequency dependent on
the load applied and the meter constant R. The pulse's rising edge is
always decisive for the test.
After switch on of voltage and current, wait 1 second for measurement to
be started.
The impulse frequency at nominal load Pn is between 4 and 6 Hz.
The test transmitting contacts are checked for accuracy with the same test
as for the optical test outputs.
Measuring Time
90 s
90 s
10 s
40 s
Landis+Gyr
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