Delta M50A 260, Operation And Installation Manual, Page: 9 / 88

1.2 General Safety
- External insulation transformer shall be installed at grid side which is following
to isolating between AC and PV array.
- The design of this inverter is transformerless. There is no isolation transformer
between the AC and DC sides, i.e., the product does not require galvanic isolation.
In order to function properly, any PV array connected must have its PV circuits
isolated from ground, i.e., do not bond either side of the array to ground!
If a grounded PV array is connected to the inverter, the error message INSULATION
(E34) will appear on the display.
- It is prohibited to reference the L1, L2, L3 or N terminal to ground; to do so will
damage the inverter and void the producr warranty.
ATTENTION : NO GALVANIC ISOLATION
- Please read these instructions carefully and save them for later use.
IMPORTANT SAFETY INSTRUCTIONS : SAVE THESE INSTRUCTIONS !
To prevent personal injury and/or property damage, and also to ensure long
term operation of the solar inverter, it is imperative this section be read carefully
and all the safety instructions understood before using this inverter.
This user manual provides important instructions for Delta grid-tie transformerless
solar inverter. The product is designed, tested, verified, and certified according
to international safety requirements, certifications, and standards but precautions
must be observed when installing and operating the product.
This product is suitable for both indoor and outdoor use.
1.2.1 Condition of Use
- M70A
_260
/ M50A
_260
is a transformerless solar inverter with 6 MPP tracking
input, which converts the variable direct current generated by the solar array
into a utility frequency grid-compliant balanced three-phase AC current and
feeds it into the utility grid.
- The Photovoltaic modules used must be compatible with the inverter. PV
modules with a high parasitic capacitance to ground may only be utilized if the
capacitive coupling does not exceed 10μF.
- The inverter must only be operated in countries for which it is approved by
Delta and the grid operator.
9
Safety