Electrical Installation For Dc Wiring; Preparation For Dc Wires Connection - Delta M100 210 Operation And Installation Manual

Installation

3.5 Electrical Installation for DC Wiring

- High energy on DC cables from PV combiner boxes could cause dangerous
electrical shock. Ensure DC cables are always de-energized until finish the
DC wiring installation.
- The risk of electric shock and fire exists because of high DC and AC voltages.
- Only PV modules that are listed with system voltage under 1100V are permitted
for use.
- M100_210 will check the insulation resistance of DC wiring before the first time
operation every day. However, DC ground fault still could damage the inverter
during the operation and not covered by warranty.
- Ensure no ground fault occurs on DC cables.
Please follow the instruction of Section 5.1 to open or close M100_210 door.
To ensure a better operating performance of the inverter, recommended configuration
for the PV array are shown below:
• To ensure the inverter operates with the highest performance, the DC input
voltage should greater than the AC Line Voltage *1.5 (or AC phase Voltage *2.5)
If the DC input voltage is lower than above value, inverter will not operates normally.
Ex: Nonimal Vac = 400Vac, Vmp should be > 400Vac*1.5 = 600Vdc
• PV array configuration should be designed considering the lowest environment
temperature and make sure the Voc of the PV array is within 1000Vdc.
• Inverter will be damaged if the DC input voltage is higher than 1100Vdc, and the
product warranty will be voided.

3.5.1 Preparation for DC Wires Connection

• Only copper or aluminum cables are acceptable to be used
• Stranded and Solid wire is available
• Must be equipped with the terminal lug
• Must be using bi-metallic cable lugs for the aluminum conductors to prevent
electrochemical corrosion
M100
_210
of the DC cable for the two cases are different.
Case of DC input
Max. conductor cross section
Cable diameter range
Cable lug dimension
DANGER : ELECTRICAL HAZARD!!
WARNING !
ATTENTION
can support one or two PV combiner boxes input. The requirements
1 PV combiner box
185mm²
12.0 – 28.9mm
Size of bolt = M10
b
a < 40.0mm
b = 10.5mm
a
c < 16.0mm
c
34
2 PV combiner boxes
120mm²
9.5 - 18.8mm
Size of bolt = M10
a < 40.0mm
b = 10.5mm
c < 16.0mm