Installation guide

Installation Guide RN3000US Jan13
39
CAUTION!
Avoid using wire nuts to for any connections in the PV system. Wire
nuts are a frequent cause of unreliable, resistive connections, and ground
faults.
5.4.2 Connecting the DC Wires
1) Verify that the AC breaker(s) are OFF.
2) Verify that the DC breaker is OFF.
3) Pull the DC wires from the DC breaker through the conduit into the interior
of the Digiwatts unit.
4) Connect the positive and negative DC wire to the terminal labeled DC+
and DC- in the Digiwatts unit.
5) Connect the PV array ground wire to the PE terminal labeled within
the Digiwatts unit.
6) Pull on the cables in order to make sure that they are sufficiently secured
within the terminals.
5.5 Communication Wiring
The inverter provides RS485 interface and network interface to communicate with
remote PC or Internet. User can monitor the state of the inverter and observe
real-time and historical functional information via this interface.
WARNING!
 The RS485 cable should not be longer than 1200 meters with a
common shield and a wire size no smaller than 24 AWG.
 The network cable between two devices should not be longer than
50 meters.
5.5.1 RS485 Communication
RS485 is a communication standard for bidirectional transmission of data
between one or more Digiwatts units and a PC
.