Delta RPI M30A, Operation And Installation Manual

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4.2 Preparation Before Wiring (Models without Fuse)
• RPI M30A_121 does not have internal strings fuse. Each string can accept
maximum current 30A. It can use one pair of DC connector for each input
(DC1 and DC2)
• 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.
• When solar array is grounded,the PID function can not be enable,and the
insulation have to be setting “Plus Grounded” or “Minus Grounded”.
• Different DC connection type needs different settings of insulation detection.
About setting, please refer to 5.2.7 Install Settings.
Figure 4-5 floating string of M30A_121
1
2
3
4
L1
L2
L3
N
PE
Communication
Wiring
1
2
3
PV Array
AC Wiring
DC Wiring
Parallel or
Separate
*
* RPI M30A can support 3P3W system.
DC Distribution box
DC1 DC2
21
Wiring