Grid Voltage Measurement - LG A1C-V5 Series Installation Manual

Electronics

3-13 Grid Voltage Measurement

Measure AC voltage 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 120
L2 – N 120
L3 – N -
L1 – L2 240
L2 – L3 -
L3 – L1 -
At AC junction box
Single Phase 240V(RMS)
Measure point
Expected
L1 – N 120
L2 – N 120
L3 – N -
L1 – L2 240
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
106~132 120
106~132 120
211~264 208
Range Measured Expected
106~132 120
106~132 120
211~264 208
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Voltage
measure
Single Phase 208V(RMS)
Range Measured
106~132
106~132
-
183~229
Single Phase 208V(RMS)
Range Measured
106~132
106~132
-
183~229
Meter
G
N L1 L2
Distribution pan
el
Three Phase 208V(RMS) Merge,
Split Type
Expected Range Measured
120 106~132
120 106~132
120 106~132
208 183~229
208 183~229
208 183~229
Three Phase 208V(RMS) Merge,
Split Type
Expected Range Measured
120 106~132
120 106~132
120 106~132
208 183~229
208 183~229
208 183~229
45