Grid Frequency Measurement - LG A1 Series Installation Manual

3-14 Grid Frequency Measurement

Measure grid frequency of the utility at the distribution panel and AC junction box using a volt-
meter. Fill out the below table. If the measured voltage is out of the range which is specified in
each table, then ask to local electricity provider for voltage instability.
An array of AC modules
At distribution panel
Measure point
Expected
L1 – N 60Hz
L2 – N 60Hz
L3 – N -
L1 – L2 60Hz
L2 – L3 -
L3 – L1 -
At AC junction box
Measure point
Expected
L1 – N 60Hz
L2 – N 60Hz
L3 – N -
L1 – L2 60Hz
L2 – L3 -
L3 – L1 -
•
Plan the installation work in moderate weather. There is a risk of electric shock when it is raining
or snowing.
•
To prevent the risk of accidents, use proper PPE (Personnel Protective Equipment) including
helmets and gloves at all times.
•
If installation location is high above ground, make sure to use Fall Protection System during the
installation.
• For safety, only qualified personnel should service the work.
Rev. 1.5
AC Module System Installation Manual
Leave the transition
cable disconnected
Single Phase 240V(RMS)
Range Measured
59.4~60.4
59.4~60.4
59.4~60.4
Single Phase 240V(RMS)
Range Measured
59.4~60.4
59.4~60.4
59.4~60.4
Frequency
measure
AC junction box
Single Phase 208V(RMS)
Expected Range Measured
60Hz 59.4~60.4
60Hz 59.4~60.4
-
60Hz 59.4~60.4
Single Phase 208V(RMS)
Expected Range Measured
60Hz 59.4~60.4
60Hz 59.4~60.4
-
60Hz 59.4~60.4
Meter
G
N L1 L2
Distribution panel
Three Phase 208V(RMS)
Merge, Split Type
Expected Range Measured
60Hz 59.4~60.4
60Hz 59.4~60.4
60Hz 59.4~60.4
60Hz 59.4~60.4
60Hz 59.4~60.4
60Hz 59.4~60.4
Three Phase 208V(RMS)
Merge, Split Type
Expected Range Measured
60Hz 59.4~60.4
60Hz 59.4~60.4
60Hz 59.4~60.4
60Hz 59.4~60.4
60Hz 59.4~60.4
60Hz 59.4~60.4
45