2.7 PV Connection
WARNING
Do NOT connect PV to earth!
NOTE
Use a suitable voltmeter that can measure up to 1000 V
DC.
PV Connection Procedure:
1.
First verify the polarity and maximum voltage of
the PV arrays by measuring the PV open-circuit
voltage. The PV open-circuit voltage must not
exceed 1000 V DC.
2.
Measure the DC voltage between the plus-
terminal of the PV array and Earth (or the green/
yellow PE cable). The voltage measured should
approximate zero. If the voltage is constant and
not zero there is an insulation failure somewhere
in the PV array. Locate and fix the failure before
continuing.
3.
Repeat this procedure for all arrays. It is allowed
to distribute the input power on the inputs
unevenly, presuming that:
•
The nom. PV power of the inverter is
not exceeded (6.2 / 8.2 / 10.3 / 12.9 /
15.5 kW).
•
The maximum short-circuit current of
the PV modules must not exceed 12 A
per input.
4.
On the inverter turn the PV load switch into off
position. Connect the PV cables by means of MC4
connectors. Ensure correct polarity! The PV load
switch can now be switched on when required.
Illustration 2.22 DC Connection Area
CAUTION
When unmated, the MC4 connectors are not IP54. Intrusion
of moisture may occur. In situations where the PV
connectors are not fitted, a seal cap must be mounted
(included in the scope of the delivery). All inverters with
MC4 connections are delivered with seal caps on inputs 2
and 3. During installation, the seal caps of those inputs
that are to be used are discarded.
NOTE
The inverter is protected against reversed polarity but it
will not generate power until the polarity is corrected. To
achieve optimum production, the open-circuit voltage
(STC) of the PV modules must be lower than the max.
input voltage of the inverter (see
4.1 General Data
),
multiplied with a factor of 1.13. U
OC
, STC x 1.13 ≤ U
MAX
, inv.
2.8 Auxiliary Input/Output
The inverter has the following auxiliary input/output:
•
2 x RJ-45 for RS-485
•
2 x RJ-45 for Ethernet
•
1 x 8 pole terminal block for RS-485
•
1 x 10 pole terminal block for
-
PT1000 temperature sensor input x 3
-
Irradiation sensor input
-
Energy meter (S0) input
•
1 x 2 pole terminal block for relay outputs
Refer to the specifications for an overview of the
communication board and to the inverter user manual for
details regarding auxiliary input configuration via the
display.
2.9 Autotest Procedure
An automatic test of the inverter can be initialised by
activating the inverter autotest procedure:
•
Via the display, go to [Setup
→
Autotest] and
press OK.
•
Via the web interface, go to [Inverter level: Setup
→
Setup details
→
Autotest] and click on [Start
→
Test].
The inverter autotest manual can be downloaded from
www.danfoss.com/solar.
Installation
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