4
5. Clamps terminal use
All power conductors will be inserter in spring clamp terminals.
The figure shows an example of how to make the wire connection:
• Insert a small flat screwdriver in the slot and lightly press the screwdriver
from top to bottom; insert the screwdriver until the spring opens.
• Insert the cable in the spring clamp.
• Remove the screwdriver.
• When connections are complete, give each wire a pull test
6. Rapid Shutdown
WARNING –
B
If an RSD device is installed on the plant, the inverter
will power-up only if both AC and DC are supplied!
The installer must use an external rapid shutdown device compliant with
the 2014 NEC.
Automatic shutdown occurs at the rooftop box when utility power (AC)
is lost or when the PV system’s AC disconnect switch is opened. In
jurisdictions requiring a dedicated activation switch should be installed an
emergency stop button external to the inverter.
The wiring box has 24Vdc (0.4A max) on a spring-loaded terminal block
designed to power-up an external RSD device.
The wire size range of RSD terminals is 26-12 AWG.
• Connect the RSD device respecting the polarity indicated on each RSD
terminal.
CAUTION
ATTENTION
REFER TO LOCAL CODE
FOR WIRE SIZE
FAIRE RÉFERENCE À LA
LÉGISLATION LOCALE POUR
LA DIMENSION DU CABLE
-IN1
+IN1
-IN2
+IN2
1
2
3
-RSD
+RSD
7. Input connection (DC)
WARNING –
B
Confirm the correct polarity in the input strings.
Confirm there is no ground leakage current in the PV array. When
exposed to sunlight, the PV panels supply DC direct voltage to the
inverter. The inverter’s DC switch disconnects the DC current from
the PV panels. In the “OFF” position the inverter will stop producing
power, but DOES NOT disconnect the AC from the grid. To prevent
electrocution hazards, all the connection operations must be carried
out with the external AC disconnect switch, downstream of the
inverter (grid side), open and locked out.
WARNING –
B
The transformerless design requires that the PV array
to be floating with respect to ground per NEC 690.35. DC PV string
wire must be listed PV wire per NEC 690.35 rated minimum 600V.
PV output conductors (wiring) must consist of sheathed (jacketed)
multi-conductor cables or single insulated conductors (wires) which
must be installed in an approved raceway. These conductors must
be isolated from the enclosure and system grounding, as required by
NEC 690.35. This is the responsibility of the installer.
WARNING –
B
Confirm that the maximum PV array short circuit
current for each DC input channel is within the inverter specification
(see table in Section 14). Array equipment grounding must be
installed per the requirements of the NEC and is the responsibility of
the installer. A configuration program that can help to correctly size
the photovoltaic system is available on at http://stringsizer.fimer.com/
• Turn the DC switch OFF
• Loosen the four captive screws on the wiring box cover (Torx 20) and
remove the cover
• Pass the DC wires through the openings dedicated to the DC conduit.
ATTENTION –
A
Conduit must be sealed using water-tight fittings to
maintain NEMA Type 4X enclosure integrity. Installer should follow
conduit manufacturers’ guidelines and best practices.
• Connect the DC wiring to DC input terminal blocks
(12)
. DC wiring terminals
are spring pressure type and accommodate a wire size range of 20-8 AWG.
Connect the strings in either independent or parallel mode, following the
appropriate set of instructions below:
Independent mode configuration
In case of two PV arrays, if each of them has a current rating lower than
the maximum current rating for a single inverter channel, they may be
connected as “IND” array, each with its own MPPT. In this case, do nothing
with the jumper wires which came with the inverters.
• Connect the positive side of the first PV array to +IN1, and its negative
side to -IN1.
• Connect the positive side of the second PV array to +IN2 and its negative
side to -IN2.
Up to four strings can be connected in independent mode.
• During commissioning, confirm that the input mode is set to IND.
If connecting a single array, configure the inverter for parallel input mode.
CAUTION
ATTENTION
REFER TO LOCAL CODE
FOR WIRE SIZE
FAIRE RÉFERENCE À LA
LÉGISLATION LOCALE POUR
LA DIMENSION DU CABLE
-IN1
+IN1
-IN2
+IN2
-RSD
+RSD
MPPT1
String2
MPPT2
String2
MPPT2
String1
MPPT1
String1
Parallel mode configuration
If a PV array’s output current is more than the rating for a single inverter
channel:
• connect the red jumper wire between the +IN1 and +IN2 terminal block
inputs. Then connect the jumper wire black wire between the -IN1 and -IN2
terminals. During commissioning remember to set the input mode to PAR.
• Connect the array to the IN1 (MPPT1) and IN2 (MPPT2) input positions,
running separate wires for positive (+) and negative (-) for each array.
CAUTION
ATTENTION
REFER TO LOCAL CODE
FOR WIRE SIZE
FAIRE RÉFERENCE À LA
LÉGISLATION LOCALE POUR
LA DIMENSION DU CABLE
-IN1
+IN1
-IN2
+IN2
PARALLEL
JUMPERS
-RSD
+RSD
MPPT2
MPPT1
