Connecting Multiple Sets Of Cts; Connecting Cts To Multiple Pwrcell Systems /Inverters; Ct Calibration - Generac Power Systems PWRcell XVT076A03 Installation And Owner's Manual

Electrical Connections
2. See
Figure 5-16. Connect Cat 5 cable to a CT
accessory port (H).
• CT accessory ports are double-stacked RJ-45
ports.
• Either the top or bottom port may be used.
• Both ports may be used when multiple sets of
CTs are required.
I
H
Figure 5-16. Accessory Ports
H Current Transformers (CTs) Accessory Port (RJ-45)
I Automatic Transfer Switch (ATS) Accessory Port
(RJ-45)
J
REbus Beacon Port (USB-B)
K Authorized Generac Personnel Only
L STOP Terminals
NOTE: When setting for Export Limiting or Zero Import,
attach the label packaged with the CTs to the CTs.

Connecting Multiple Sets of CTs

When installing CTs, local factors may require multiple
sets of CTs to fully measure the utility power being sent to
the building.
Installing two sets of CTs:
•
Use two pairs of CTs to measure services with two
sets of feeder conductors. Use each pair of CTs to
measure a pair of service conductors / feeders
within the main panel.
•
Connect CT1 from both sets to the same phase
and CT2 from both sets to the second phase.
•
See Table 5-10:
Connect Cat 5 cables from the adapters into the
two CT accessory ports at the inverter.
NOTE: Make sure to use the same pinout and
connections.
Table 5-10. Multiple CT Connection
Service
Adapter
CT Phase and
Wire Adapter
1-1 L1-1
1-2 L2-1
2-1 L1-2
2-2 L2-2
26
L
K
J
010001
Multiple CT Connection.
CT Port
Adapter
Row
Pins
Values
1 4 and 5 Front Port
1 3 and 6 Front Port
2 4 and 5 Back Port
2 3 and 6 Back Port
Connecting CTs to Multiple PWRcell Systems /
Inverters
When an installation has multiple PWRcell Inverter
systems, either:
•
Run a set of CTs for each inverter.
•
Run a set of CTs to one inverter and run a Cat 5
cable from the spare CT port within that inverter to
either CT port within the second inverter.
NOTE: One set of CTs may be utilized for up to two
inverters.
When running separate sets of CTs for each inverter, the
load value displayed on each inverter screen will be the
total load measured by the CTs.
When daisy-chaining two inverters, the total measured
value is shared evenly between the inverters.
NOTE: Daisy-chaining CTs between two inverters for
distributed load-share is most applicable when each
inverter has a battery attached. Otherwise, this
configuration may not be necessary or desirable.
To daisy-chain a CT signal:
1. Connect and calibrate a set of CTs to the first
inverter.
2. Run a new Cat 5 cable between the spare CT
accessory port of the first inverter to either CT
accessory port on the second inverter.
3. Set GridParInvrtrs to a value of 2. See
below.
NOTE: Running a new Cat 5 cable between inverter CT
ports prior to calibration in Step 1 may cause calibration
issues.

CT Calibration

•
Install CTs before powering ON the inverter.
•
The inverter automatically detects CTs when
turned ON.
•
Once CTs are detected, a utility pole icon will
appear on the lower right corner of the home
screen power flow diagram. Verify operation by
noting power flow.
– To calibrate CTs, navigate to the inverter device
page, access the menu, and select the Calibrate
CTs option.
– Watch the screen carefully for transient valida-
tion of CTs. When the CT calibration process has
been successfully completed, the inverter LCD
screen will provide feedback showing ct cal suc-
cess. Otherwise, the screen will show ct cal = X,
where the value of X can be found in
Automatic Detection Troubleshooting
Installation and Owner's Manual for Generac PWRCell Inverter
Table 5-11
Table 5-12:
Table.