Generac Power Systems PWRcell Reference Manual page 37

d. Navigate back to the PV Link in question: if it
says 'disable' or 'enable,' it is back online.
(1) Change the PV Link PLM Channel back to
the channel being used by all other
devices on that system.
(2) Navigate back to the inverter 'mod.
settings' menu and change the PLM
Channel back to the system's channel.
3. Check REbus Wiring
a. Ensure polarity and ground connections are
correct and intact.
b. With system de-energized, perform a tug-test
at the REbus terminals to check for loose
connections.
PV Link Error
If the home screen of the inverter says: 'error detected on
S2502', navigate to the PV Link device page(s) and
determine the PV Link state; it may lead you to another
problem on the PV Link Troubleshooting Table.
Otherwise, do the following:
1. Disable/ Enable
a. Attempt to clear the error by disabling the PV
Link then re-enabling.
b. Watch for an event message to appear on the
PV Link device page upon re-enabling.
2. PV Panel Configurations
a. Ensure there are not too many panels and
therefore too much voltage at the input of the
PV Link.
3. PV Wiring
a. Ensure PV wiring is connected to the 'input'
side of the PV Link.
b. Ensure REbus wiring is connected to the
'output' side of the PV Link.
4. REbus Wiring
a. Rule out shorts by testing REbus circuit
resistance with the inverter disabled and the
DC disconnect(s) OFF. Resistance should be
greater than 10 kΩ.
PVRSS Not Configured
There are two possible causes: either PVRSS has not
been enabled when it should have been, or PVRSS has
been enabled when it should not have been.
1. PV Link Settings
a. If PV Link is installed w/SnapRS devices,
ensure PV Link has been enabled w/PVRSS.
(1) Navigate to 'mod. settings' menu for PV
Link.
(2) Enable PVRSS setting should be 'on.'
b. If PV Link is installed w/out SnapRS, ensure
Diagnostic Repair Manual
Section 6 PV Link and SnapRS
PV Link has not been enabled w/PVRSS.
(1) Navigate to 'mod. settings' menu for PV
Link.
(2) Enable PVRSS setting should be 'off.'
2. Disable /Enable
a. Disable and re-enable to clear the fault after
fixing the issue.
NOTE: Always use 'Enable w/PVRSS' to commission a
PV Link with SnapRS devices connected.
PVRSS Count Mismatch
PV Links continually count their SnapRS, storing a value
for the number of 'SnapRS Installed'. In some instances,
the PV Link may come up with a different number of
'SnapRS Detected' depending on various factors. Do the
following:
1. Disable/ Enable
a. Disabling and re-enabling will cause the PV
Link to run its count again. This may resolve
the issue.
2. PV Link Settings
a. Verify 'SnapRS Installed' = 'SnapRS Detected'
b. If two parallel substrings are connected, verify
'String Count' has been adjusted to a value of
'2'.
c. Disable PV Link.
d. Manually enter the value of 'SnapRS Installed'
and retry.
3. Override PVRSS
a. Temporarily override PVRSS to see if PV Link
will make power without relying on its SnapRS
count.
b. If the PV Link begins making power, this
indicates a SnapRS count issue. Go back to
steps 1 and 2.
c. If the PV Link does not begin making power,
this indicates a PV wiring or SnapRS device
issue.
4. Measure Substring Voltage w/SnapRS
a. Disable the PV Link from the inverter screen.
b. Unplug the PV input +/- and measure DC
voltage of substring.
c. Voltage should not exceed the Voc of one solar
panel.
d. Voltage should not be 10V lower than the Voc
of one solar panel.
e. If value is above or below where it should be,
check PV wiring and number of SnapRS
installed.
5. Check PV Wiring
a. Inspect PV wiring for any loose connections
33