Generac Power Systems PWRcell Reference Manual page 18

Section 4 PWRcell Inverter
•
Verify Line 1, Line 2, Neutral, and Ground have
stayed consistent as they have been wired across
equipment.
•
Verify the use of 2-pole 40 amp over current pro-
tection for the grid connection to the inverter.
– If using a fused disconnect, verify fuses are
installed and well-seated.
•
Verify voltages are 120 VAC line-to-neutral and 240
VAC line-to-line nominal for split phase systems.
For three phase systems, line-to-line voltage
should be 208 VAC nominal. Reference the Gen-
erac PWRcell Commissioning Quick Start docu-
ment (Part No. DMAN00027) that comes packaged
with each inverter for full voltage ranges and more
details on performing voltage checks.
3. REbus DC Wiring
•
Verify each home run circuit consists of its own
unique positive, negative, and ground wire. It is
recommended to label both ends of each run
during installation to avoid confusion. Use a digital
multimeter (DMM) to "ring" out the runs using the
continuity function if suspected mismatching has
occurred.
•
To rule out shorted wiring, use a DMM to verify
resistance is greater than 10 kΩ for each DC circuit
with DC disconnects in the OFF position.
•
Verify correct polarity at each device and at the
inverter.
•
Verify REbus ground connections to each device
(PV Links and Batteries).
4. Check Inverter Settings
•
Verify the inverter settings are correct for the type
of installation being executed.
•
If the inverter settings are incorrect for the specific
configuration of the site, the inverter may under-
perform or wind up in an error state.
Example
'
Grid Tied
Turn EnaIslanding
Solar-only
Tie' for the system mode.
Installation
Battery '
Verify EnaIslanding
Backup
choose a backup system mode (Clean
Installation
Backup, Self Supply, Priority Backup).
'NumTranSwtchs'
External ATS
Verify
Installation
number of PWRcell ATS connected to the
inverter system in addition to setting inverter
for battery backup as described above.
•
See Table B-1 in
ence inverter settings.
14
'
to 'off' and choose 'Grid
'
is set to 'on' and
is set to reflect the
Appendix B Inverter to refer-
5. Disable/Enable
•
For non-terminal errors, disabling and re-enabling
the inverter may clear the error state and allow the
inverter to return to operation.
6. Power Cycle
In limited cases, power cycling the inverter may resolve
inverter functionality.
•
Perform a system shutdown.
•
Turn off the Battery Disconnect Switch
•
Turn off AC power to the inverter.
•
Wait for the inverter screen to go blank.
•
Re-energize the system in reverse order.
7. REbus Fuses
•
Always perform a system shutdown before remov-
ing the REbus fuses in the inverter.
•
Watch the home screen and wait for VDC to fall
below 12 volts.
•
Use a DMM to check for voltage at the DC termi-
nals.
•
Once voltage has been turned off and system is
safe to service, unscrew the two round black fuse
holders at the lower left corner of the Power Core.
•
Use a DMM to test fuses for continuity.
NOTE: Blown fuses almost always result from a short on
REbus wiring or a failed device on the system. Do not
replace fuses until system issue has been resolved.
8. Basic Function Test
This test isolates the Power Core from the DC bus for a
health check on the core.
•
Perform a system shutdown.
•
Turn all DC disconnects to the OFF position.
•
Recover from shutdown mode.
•
Enable the inverter
•
If the inverter connects to the grid and can bring up
the DC bus internally, it passes the Basic Function
Test.
•
If the inverter does not pass this test, call PWRcell
Technical Support.
9. DC Disconnects
•
Verify DC disconnects are closed in the ON posi-
tion. REbus voltage must be present at PV Links
and Batteries for them to communicate with the
inverter.
•
Always disable the inverter before turning DC dis-
connects ON.
Diagnostic Repair Manual