Commissioning The System; Commissioning Multiple Inverter Systems - Generac Power Systems PWRcell Reference Manual

Commissioning the System

NOTE: See the Generac PWRcell Commissioning Quick
Start Guide for more information.
Before powering up the system for the first time:
•
Verify AC voltage is within the specified range for
system configuration.
– 240 V split-phase (110-128 VAC Line to Neutral)
– 208 V 3-phase (110-128 VAC Line to Neutral)
•
Verify all wiring terminations are tight and secure.
•
Verify DC wiring field terminations are secure and
polarity is correct.
•
Verify DC disconnects for all connected devices
are turned ON.
Commissioning Steps:
Connect to High Speed Broadband Internet.
1.
Register System.
2.
Connect PWRcell Inverter to AC Power.
3.
Select Inverter System Mode.
4.
Configure Inverter Settings.
5.
Enable REbus Devices.
6.
Test Island Mode.
7.
Configure Time of Use (optional).
8.
Access Installer Configuration Tool
9.
(for steps 10 – 11).
Set Inverter Grid Compliance (optional).
10.
Set Import / Export Compliance (optional).
11.
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 cross-talk.
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 Cross-talk
Cross-talk can be easily identified by navigating to the
device pages on an inverter control panel. If two inverter
device pages exist, or if devices connected to one
inverter show up on the other, cross-talk has occurred.
Diagnostic Repair Manual
NOTE: To differentiate one 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 de-energized with no volt-
age present at their AC Grid input terminals. Use
an appropriately rated digital multimeter (DMM) to
verify if AC voltage is present at the AC Grid termi-
nals.
NOTE: To determine if the inverter is de-energized,
check the inverter control panel and the system backfeed
breaker. If de-energized, the inverter control panel will be
powered off 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
inverters are energized at any point during this process,
the inverters will cross-talk. To resolve cross-talk, see
PLM Cross-talk Recovery
cross-talk, the commissioning process will need to be
restarted for the cross-talked inverters.
Close the AC backfeed breaker to supply AC
1.
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.
Perform
Commissioning Multiple Inverter Sys-
2.
tems steps 1-8.
Modify the PWRcell inverter PLM Channel to 0.
3.
NOTE: PLM Channel 0 is a catchall channel. Only use
for inverters during programming. Do not set REbus
devices to channel 0. Do not leave inverter on channel 0.
Choose a channel from 2–12 to use as the only
4.
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.
Appendix B Inverter
Procedure. After resolving
127