Delta RPI Series, Operation And Installation Manual

Page: 14 / 154

4.1. Preparation Before Wiring
• For floating PV array, inverter can accept DC input in parallel connection
or separate connection.
• When grounding the solar array, an isolation transformer at AC side is
required and DC inputs must be parallel connection due to the RPI-series
not having galvanic isolation between the DC-input and AC-output.
• Different DC connection type needs different settings of insulation detection.
About setting, please refer to 5.2.7.3 Install Settings.
4. Wiring
WARNING ！ SHOCK HAZARD
Whenever a PV array is exposed to sunlight, a shock hazard may exist due
to output wires or exposed terminals. To reduce the risk of shock during
installation, cover the array with an opaque (dark) material and ensure that
the disconnect device in the inverter is set to OFF before commencing any
wiring.
Figure 4-1 Connection of a system for floating DC inputs
1
2
3
4
L1
L2
L3
N
PE
Communication
Wiring
1
2
3
PV Array
AC Wiring
DC Wiring
Parallel or
Separate
DC Distribution box
DC1 DC2
*
* M15A / M20A can also
support 3P3W system.
14
Wiring