Delta RPI M30A, Operation And Installation Manual

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4.1 Preparation Before Wiring (Models with Fuses)
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.
• M50A has 15A DC fuse in each Plus and Minus DC connector, the
maximum current of each string should not exceed 10A.
• For models with fuses, PV arrays can connect to the inverter directly, but
parallel connection at external DC distribution box is not recommended
due to the limits of DC fuse. Please refer to Figure 4-1 for the detail wiring
illustrations.
• If you want inverter working at parallel input mode (only 1 MPPT), please
install 2 bus bar kits in the inverter as shown in Figure 4-2 . The outer wiring
at DC side is same as Firgure 4-1 .
• When grounding the solar array, an isolation transformer is required
because the RPI series does not have galvanic isolation between the
DC-input and AC-output. In addition, Users must install a 1000V/1A midget
size grounding fuse and 1 or 2 bus bar kits in the inverter.
Wiring illustrations please refer to
Figure 4-3
,
Figure 4-4
.
• When solar array is grounded,the PID function can not be enable,and the
insulation have to be setting “Plus Grounded” or “Minus Grounded”.
• It must to keep DC and AC power off when disconnected the DC connector.
• Different DC connections type need different settings of insulation detection.
Please refer to 5.2.7 Install Settings for further information.
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Wiring