Commissioning Multiple Inverter Systems; Plm Crosstalk; How To Identify Plm Crosstalk; Multiple Inverter System Pre-Commissioning Checklist - Generac Power Systems PWRcell XVT076A03 Installation And Owner's Manual

Commissioning Multiple Inverter
Systems
NOTE: Do not energize two or more inverters before
commissioning. Energizing two or more inverters prior to
commissioning will result in crosstalk.
PWRcell Inverters are manufactured with some common
default parameters. One of these default parameters is
the default Power Line Modem (PLM) channel. PWRcell
Inverters use the PLM channel to communicate with and
send commands to REbus-powered devices. In this way,
a PWRcell Inverter behaves like a master device. If two
or more master devices are communicating on the same
PLM channel, REbus devices become unable to respond
properly to the intended master device and the master
devices will attempt to provide control for the other, often
leading to communication and reporting issues. This is
referred to as cross-talk.

How to identify PLM Crosstalk

Cross-talk can be easily identified by navigating to the
device pages on an inverter control panel. If two inverter
device pages exist, crosstalk has occurred. Similarly, if
any REbus devices from one inverter show up on
another, crosstalk has occurred.
NOTE: To differentiate one inverter device page from
another, confirm the RCP numbers via the device page
sub-menu.
NOTE: It is recommended to keep a list of which REbus
devices are connected to specific inverters at multi-sys-
tem sites.
Multiple Inverter System Pre-Commissioning
Checklist
Before commissioning multiple inverter systems, confirm
the following:
•
Inverter systems (including PV Links and PWRcell
Batteries) have been installed per manufacturer
instructions and to local and state code require-
ments.
•
PWRcell Batteries have their Battery Disconnect
switches in the OFF position.
•
PWRcell Inverters are powered off with no voltage
present at their AC Grid terminals. Use an appro-
priately rated multi-meter/voltmeter to verify if AC
voltage is present at the AC Grid terminals.
NOTE: To determine if the inverter is powered off, check
the inverter control panel and the system backfeed
breaker. When powered-off, the inverter control panel will
be blank and the inverter backfeed breaker will be OPEN.
Multiple Inverter System Commissioning
Procedure
NOTE: Throughout this process, it is important that only
one inverter is energized at any time. If two or more
Installation and Owner's Manual for Generac PWRCell Inverter
inverters are energized at any point during this process,
the inverters will cross-talk. To resolve crosstalk, see
PLM Crosstalk Recovery
crosstalk, the commissioning process will need to be
restarted for the cross-talked inverters.
1. Close the AC backfeed breaker to supply AC
power to one PWRcell Inverter AC Grid Input/Out-
put Terminals. This will allow the inverter to ener-
gize and illuminate the Inverter control panel.
2. Perform Commissioning the System
3. Modify the PWRcell Inverter PLM Channel to 0 in
the inverter 'Mod. Settings' menu.
NOTE: PLM Channel 0 is a universal channel. Only use
for inverters during programming. Do not set REbus
devices to channel 0. Do not leave inverter on channel 0.
4. Choose a channel from 2 – 12 to use as the only
number for addressing all devices on the system.
The goal is to address the system to its own unique
channel across all devices.
NOTE: Do not leave any device, including the inverter,
on channel 0 or channel 1 by the end of the process.
5. Use arrow keys to navigate to all REbus devices
(expect REbus Beacon) to change the PLM chan-
nel.
6. Access Mod. Settings for each device and change
the PLM channel to the chosen channel (step 4) for
that system. See device installation manual for
specific instructions.
7. Modify the PLM channel setpoint for the PWRcell
Inverter to match the PLM channel its REbus
devices were set to in the previous step.
NOTE: Be sure to click Save at the bottom of the menu
after modifying the channel on each device.
8. Turn off the inverter.
NOTE: It may take a few seconds for the inverter screen
to power off due to capacitance in the Power Core. Wait
until the screen goes blank before energizing the next
inverter.
9. Once the inverter is powered down, proceed to the
next inverter and repeat steps 1 – 9.
10. After programming each system separately, restore
AC power to all PWRcell Inverters by closing their
AC backfeed breakers, enable the inverters, and
all REbus devices.
11. Finish commissioning of inverter systems by per-
forming
Commissioning the System
Optional steps may be skipped if not applicable.
Commissioning
Procedure. After resolving
steps 1 – 5.
steps 7 – 11.
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