Smart Meter & Ct Connections - LG LGES-5048 User Manual

Note
:
For convenient maintenance, please install a SP3T switch on back-up and on-grid side. Then it is
adjustable to support load by back-up or by grid or default settings.
Back-Up
1
2
3
Load
SP3T
Declarations For Backup Overload Protection
Inverter will restart itself if overload protection triggers. The preparation time for restarting will be
longer and longer (one hour at most) if overload protection repeats. Take following steps to restart
inverter immediately.
Decrease back-up load power within maximum limitation.
On LGES PV Master App > Advanced Settings > Click "Reset Backup Overload History".
2.4.5 Smart Meter & CT Connections
Make sure the AC cable is totally isolated from AC power before connecting the Smart Meter
and CT.
A Smart Meter with the CT in product box is compulsory for LGES system installation. It can be
used to detect the grid voltages and current directions, provide the operating condition of the LGES
inverter via RS485 communications.
Note:
1. The Smart Meter with CT is already configured ; please do not change any settings on the Smart Meter.
2. One Smart Meter can be used with only one LGES series inverter.
3. If LGES series inverter is used in a three-phase grid with a three-phase smart meter, the three CTs
must be used for one Smart Meter, and must be connected on the same phase with Smart Meter power
cable.
Smart Meter & CT connection diagram
• For Single Phase Grid
On-Grid
Grid
PE
N
L
To Smart Meter
15
1. Back-up load is supplied from back-up side.
2. Back-up load is isolated.
3. Back-up load is supplied from grid side.
CT
Load
Grid