Grid Voltage Measurement - LG A1C-V5 Series Installation Manual

5-7 Grid Voltage Measurement

Measure AC voltage 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 the local electricity provider about voltage instability. After the work, please
follow 3-15 Energize the installed AC module system to restart the system.
An array of AC modules
At distribution panel
Measure point
Expected
L1 – N 120
L2 – N 120
L3 – N -
L1 – L2 240
L2 – L3 -
L3 – L1 -
At AC junction box
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 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 undertake the work.
Rev. 1.0
AC Module System Installation Manual
1. Turn off the circuit
breaker first.
2. Leave the transition
cable disconnected
Single Phase 240V(RMS)
Range Measured
106~132
106~132
211~264
Single Phase 240V(RMS)
Range Measured
106~132
106~132
211~264
AC junction box
Single Phase 208V(RMS)
Expected Range Measured
120 106~132
120 106~132
-
208 183~229
Single Phase 208V(RMS)
Expected Range Measured
120 106~132
120 106~132
-
208 183~229
3. Measure the voltage at
AC junction box and
distribution panel.
Meter
G
N L1 L2
Distribution panel
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
90