3. Installation
3. Installation
.21.
.20.
3.4.2 Connect PV side of inverter
Please use appropriate DC cable for PV system.
1. Measure the PV voltage of the DC inputs with multimeter, verify DC input cable polarity.
2. Strip the DC cables insulating layer with a proper length.
WARNING
DO NOT connect the PV array positive or PV array negative cable to ground.
This can cause serious damage to the inverter!
WARNING
MAKE SURE the polarity of the PV array output conductors matches
the DC- and DC+ terminal labels before connecting these conductors
to the terminals of the inverter.
WARNING
Before connecting the inverter, make sure the PV array open circuit
voltage is within the limit of the inverter. Otherwise, the inverter could
be damaged.
Figure 3.18 Multimeter measurement
+
S2
S1
-
S2
S1
Figure 3.19 Multimeter measurement
+
-
3. Strip the insulation of the wire past the cable crimping area of the OT terminal, then use
a hydraulic crimp tool to crimp the terminal. The crimped portion of the terminal must be
insulated with heat shrinkable tube or insulating tape.
4. Insert the cable through the nut, sheath, and DC terminal cover. Connect the cable to the
DC terminal block in turn, using a socket wrench.
Tighten the screws on the terminal block.
The torque is 7.3-14.7 ft.lbs.
Figure 3.20 wiring
PV+
PV-
PV+
PV-
Figure 3.21 Connect the DC Connectors to the Inverter
Caution:
If DC inputs are accidently reversely connected or inverter is faulty or not
working properly, it is NOT allowed to turn off the DC switch as it will damage
the inverter and even leads to a fire disaster.
The correct actions are:
*Use a clip-on ammeter to measure the DC string current.
*If it is above 0.5A, please wait for the solar irradiance reduces until the
current decreases to below 0.5A.
*Only after the current is below 0.5A, you are allowed to turn off the DC
switches and disconnect the PV strings.
Please note that any damages due to wrong operations are not covered in
the device warranty.
NOTE:
0.08in~0.12in
S2 (insulation stripping length) is
longer than S1.
(OT cable terminal crimping area)
