Grid Frequency Measurement - LG A1C-V5 Series Installation Manual

Electronics

3-14 Grid Frequency Measurement

Measure grid frequency of the utility at the distribution panel and AC junction box using a voltmeter.
Fill out the below table. If the measured voltage is out of the range which is specified in each table, ask a
local electricity provider about voltage instability.
An array of AC modules
At distribution panel
Single Phase 240V(RMS)
Measure point
Expected
L1 – N 60Hz
L2 – N 60Hz
L3 – N -
L1 – L2 60Hz
L2 – L3 -
L3 – L1 -
At AC junction box
Single Phase 240V(RMS)
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 snowing or raining.
• To prevent the risk of accidents, use proper PPE (Personal Protective Equipment) including helmets, eye
protection and gloves at all times.
• If installation location is high above ground, make sure to use Fall Protection System during
installation.
• For safety, only qualified personnel should perform the services.
Rev. 1.0
AC Module System Installation Manual
Leave the transition
cable disconnected
AC junction box
Range Measured Expected
59.4~60.4 60Hz
59.4~60.4 60Hz
59.4~60.4 60Hz
Range Measured Expected
59.4~60.4 60Hz
59.4~60.4 60Hz
59.4~60.4 60Hz
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Frequency
measure
Single Phase 208V(RMS)
Range Measured
59.4~60.4
59.4~60.4
-
59.4~60.4
Single Phase 208V(RMS)
Range Measured
59.4~60.4
59.4~60.4
-
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
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