YASKAWA Solectria PVI 25TL-208 Installation And Operation Manual page 48

Installation and Operation Guide SOLECTRIA® PVI 25TL-208, PVI 50TL-480 and PVI 60TL-480
require fuse protection for each DC input conductor (i.e. NEC 2014 or earlier), additional fusing shall be
installed for the conductors connected to the negative (-) DC input terminal of the Solectria PVI 25TL-208, PVI
50TL-480, and PVI 60TL-480 inverters. The voltage rating of the fuse must be at least 1000V
be used for this purpose. Any additional fusing must be installed outside of the inverter.
Use of different fuses or wrongly sized fuses can cause damage to equipment or create un-safe working
conditions. Any damage resulting from incompatible fuses is not covered by warranty.
To ensure the optimum performance of the inverter, please read the following guidelines before performing any
DC connections.
 Confirm the maximum open circuit voltage of the PV modules is lower than 1000V
 Confirm that the PV modules for each MPPT within the inverter are of the same type and specification
before connection.
 Ensure correct polarity of the PV Strings before terminating the DC source circuits. Referring to Figure
3-28, the wiring from the PV string pairs must be checked according to the following steps:
o Use a multi-meter to measure the PV strings' conductor ends and check the polarity.
o The positive (+) terminal of the conductor should match the positive (+) terminal of inverter's DC
input.
o The negative (-) terminal of the conductor should match the negative (-) terminal of inverter's DC
input.
DC Polarity Check: It is important to use a multi-meter to check the polarity of the DC source conductors to
avoid any risk of reverse polarity.
A reversed string is not protected by the inverter and can cause severe damage to equipment and personnel. A
reversed string is extremely hazardous and will result in a blown fuse when the irradiation is high. The voltage
across the blown fuse can be as much as two times Voc and could prevent proper fuse operation resulting in a
fire.
DOCR-071030-A (10/7/2022)
DC Conductor Connection
WARNING
NOTICE!
WARNING
. In-line fuses can
DC
under any conditions.
DC
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