Delta RPI Series, Operation And Installation Manual

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The following parts will introduce the setting items of user level.
• Inverter ID:
Inverter ID is used in RS-485 communication, for PC recognizing the
inverter. If users connect several inverters together via RS-485, each
inverter must have different ID.
• Insulation:
Before connecting to grid, inverter will measure the impedance between
the PV array and PE first. There are 6 impedance measurement methods:
ON, DC1 Only, DC2 Only, Positive Ground, Negative Ground, and OFF.
Installer must select the appropriate method based on PV array’s wiring.
• Country:
Each country has its own electricity regulations. Installer must select the
country correctly.
• RCMU:
RCMU is a detection function that detecting the leakage current between
input and output. If the leakage current exceeds the internal limit, inverter
will shutdown immediately.
• Reconnection Time:
When error or fault occurred, inverter will disconnect from grid.
After error or fault is cleared, the inverter will reconnect to grid in this
reconnection time.
• Ramp-up Power:
When there is enough power generated from PV array, inverter will start
to feed in power to grid with a ramp up rate. Users can adjust this ramp
up rate through this item.
• AC connection:
RPI-M15A / M20A models can support 3P3W and 3P4W system.
Please select the correct AC wiring type.
• Grid err. Lock:
This function is for Japan electricity regulation only. If there is any fault
occurred in grid side, inverter will lock itself and not trying to reconnect
anymore until users unlock it with special instruction.
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Turn on/off PV inverter