Connection Example - Bergey POWERSYNC II Series Operator's Manual & Installation Instructions

4.9. Connection example

Wiring methods in accordance Electrical Connections are made to the
with the National Electrical Code, unit via the 1.5" conduit holes in the
ANSI/NFPA 70 are to be used. bottom of the enclosure. Use at least
12" of flexible conduit below inverter for
input and output connections.
240 Vac Utility Connection
Gale 12KW
POWERSYNC II
Inverter
inverter
PSII
AMFA-27
Both input and output
disconnects must be opened
Reversing
before making connections
Meter
to the inverter.
Main Breaker
Panel
Grid Disconnect
Backfeed 60A
Breakers
Surge
Arrestor
Additional disconnect
The inverter's earth ground
switches may be needed if
connection must be
the inverter is not installed
bonded directly to the
conveniently close to the
service entrance's earth
main breaker panel.
ground which in turn is
bonded to neutral.
With the wind turbine tower sticking high into the air, lightning damage is a concern to most inverter
customers; especially those customers in areas with frequent cloud to ground lighting. BWC's warranty
does not cover lightning damage to the inverter. A direct lightning strike can easily be in excess of 100kV
at 100kA. Proper grounding of the turbine to the tower and running the input wires down the tower in
grounded metal conduit will take care of most of this energy. The standard inverter is capable of
withstanding input line to ground surges of about 6kV at 3kA. Contact your distributor or BWC for
application specific lightning surge suppression solutions.
240Vac Split-phase connection
For inverter inputs use
Isolated 3-phase 600 Vac wire
6 – 2 AWG, 90 °C copper wire only
(4 AWG minimum recommended)
Input Disconnect Switch
With three UL listed
400V 50A fuses
Inverter outputs
Single-phase 208 Vac
6 – 1/0 AWG, 90 °C copper wire
or 4 – 1/0 AWG, 90 °C Aluminum wire
(4 AWG minimum recommended)
Surge arrestors are not required but are recommended. No lightning
protection system provides complete protection. Lightning damage is not
covered under your warranty. Contact your distributor or DTI for application
specific lightning surge suppression solutions.
Page 7
1.405.364.4212 / www.bergey.com
Operator's Manual & Installation Instructions
Run the phase wires either inside the
tower tube or in grounded metal conduit.
This helps reduce induced current from
lightning.
Tower Disconnect Switch
The inverter's earth ground
connection must be
bonded directly to the
tower disconnect box
which in turn should be
connected to a ground rod
at the tower.
Use 3-phase 600 Vac wire sized for the turbine capacity
90 °C copper wire only
Run the phase wires underground between the tower and the
inverter. This will help reduce lightning surges.
PowerSync II
Wind Turbine
Surge
Arrestor
Rev. 2.6
28 October 2011
Rev: 1.1