
Electronics
AC Module System Installation Manual
Copyright © 2020 LG Electronics.
All Rights Reserved.
92
Rev. 1.0
Measure point
Single Phase 240V(RMS)
Single Phase 208V(RMS)
Three Phase 208V(RMS) Merge, Split Type
Expected
Range
Measured
Expected
Range
Measured
Expected
Range
Measured
L1 – N
60Hz
59.3~60.5
60Hz
59.3~60.5
60Hz
59.3~60.5
L2 – N
60Hz
59.3~60.5
60Hz
59.3~60.5
60Hz
59.3~60.5
L3 – N
-
-
60Hz
59.3~60.5
L1 – L2
60Hz
59.3~60.5
60Hz
59.3~60.5
60Hz
59.3~60.5
L2 – L3
-
60Hz
59.3~60.5
L3 – L1
-
60Hz
59.3~60.5
5-8 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 frequency is out of the range which is specified in each table, then
ask the local electricity provider about voltage frequency instability. After the work, please follow 3-15
Energize the installed AC module system to restart the system.
At distribution panel
At AC junction box
Measure point
Single Phase 240V(RMS)
Single Phase 208V(RMS)
Three Phase 208V(RMS) Merge, Split Type
Expected
Range
Measured
Expected
Range
Measured
Expected
Range
Measured
L1 – N
60Hz
59.3~60.5
60Hz
59.3~60.5
60Hz
59.3~60.5
L2 – N
60Hz
59.3~60.5
60Hz
59.3~60.5
60Hz
59.3~60.5
L3 – N
-
-
60Hz
59.3~60.5
L1 – L2
60Hz
59.3~60.5
60Hz
59.3~60.5
60Hz
59.3~60.5
L2 – L3
-
60Hz
59.3~60.5
L3 – L1
-
60Hz
59.3~60.5
AC junction box
An array of AC modules
Frequency
measure
Meter
•
Plan the installation work in moderate weather. There is a risk of electric shock when it is raining snowing.
•
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 the installation.
•
For safety, only qualified personnel should undertake the work.
1. Turn off the circuit
breaker first.
2. Leave the transition
cable disconnected.
Meter
N L1 L2
Meter
G
General Wiring
Distribution panel