Siliken se2.8i, User Manual

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Installation
26
user’s manual inverter SE2.8i - SE3.8i - SE4i - SE5i
CAUTION!
The Positive Polarities of the DC input voltage from a PV string shall be correctly connected to the “GROUNDED CONDUCTOR”
terminal and the Negative Polarity of the DC input voltage from a PV string shall be connected to the “UNGROUNDED CONDUCTOR”
terminal. Make sure the DC voltage that PV arrays generate is equal to or less than 600 VDC in any case.
• The “+” cable of the DC input voltage shall be connected to the terminal labelled “GROUNDED CONDUCTOR” and the “-” cable of the DC
input voltage shall be connected to the terminal labelled “UNGROUNDED CONDUCTOR”.
• Avoid using wire nuts to join any wires together or to make any connections anywhere in the PV system. Wire nuts are a frequent cause of
unreliable connections, resistive connections, and ground faults.
• Tighten the screws with a torque of 1.7Nm (15.6 in-lb).
2.3.3 Connection of the Communication cable
The SE inverter supports two common data interface standards, RS-232 and RS-485 that will be used to communicate to the remote computer
or terminal. Only one of the communication interfaces can work at a time. As shown in the figure 2.3.3.1, there are two RJ-45 connectors (RJ45-
L and RJ45-R) located on the bottom of the wiring box. The pin numbers of the RJ-45L and RJ-45R connectors and the corresponding signals
are described in the figure 2.3.3.2 below.
!
Fig 2.3.3.1
Positions of the communication ports
and termination switch
Fig 2.3.3.2 RJ-45 Pins and Signals
RJ45-L RJ45-R
Pin:
1. TXD (RS-232)
2. RXD (RS-232)
3. Not used
4. GND
5. GND
6. Not used
7. Data + (RS-485)
8. Data - (RS-485)
Pin:
1. Factory reserved
2. Factory reserved
3. 5V
4. GND
5. GND
6. 5V
7. Data + (RS-485)
8. Data - (RS-485)