Generac Power Systems S2502 Installation Manual page 31

Section 8: Troubleshooting
Problem
Low Sun w/ PV Link does not have adequate input voltage.
out SnapRS PV Links will show 'low sun' every night when the
sun goes down or if PV modules are covered. Low
sun when the sun is shining indicates a problem w/
PV input. This is not a REbus wiring issue.
Low Sun w/ PV Link does not have adequate input voltage.
SnapRS PV Links will show 'low sun' every night when the
sun goes down or if PV modules are covered. Low
sun when the sun is shining indicates a problem w/
PV input. This is not a REbus wiring issue.
No PV Link
• DC Disconnects are OFF for PV Links.
Device
• Polarity is incorrect for REbus (+/-) between
Comms
the PV Link and the inverter.
• PV Link has a poor ground connection to the
inverter.
• One or more REbus DC fuses are blown at the
inverter.
Known PV A PV Link that has communicated with the inverter
Link 'Offline' previously shows 'offline' at its device page when it's
connection to the inverter has been disrupted by:
• Opening the PV Link DC Disconnect
• Changing the PLM Channel on the PV Link so
that it does not match the inverter.
• Compromising REbus wiring (+ / - / ground)
PVRSS fail: The voltage detected with SnapRS devices installed
high input is higher than expected.
PVRSS not PVRSS is enabled on the PV Link, but the SnapR-
configured SInstalld setting indicates no SnapRS devices are
installed.
PVRSS The number of SnapRS devices listed in the SnapR-
count SInstalld does not match the number of
mismatch SnapRSDetected.
PVRSS fail: The module output voltage is too low to accurately
low input count the SnapRS devices.
If the failure persists, contact the nearest Independent Authorized Service Dealer (IASD) or Generac Customer Service
at 1–888–436–3722 (1–888–GENERAC), or visit
Installation Manual for PV Link and SnapRS Installation Manual
Equipment damage. Connect the PV Link output to a RE-
bus-compatible device (± 190 VDC nominal regulated DC
bus) only. Connecting to conventional PV inverters or any
other device could cause equipment damage.
Cause
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CAUTION
• If few modules are installed and substring voltage is lower
than 135 V, adjust Vin Startup value in mod. settings.
• Check PV Link Settings
• Measure Substring Voltage
• Inspect PV Wiring
• Verify PV Link was enabled w/ PVRSS.
• If few modules are installed and substring voltage is lower
than 135 V, adjust Vin Startup value in Mod. Settings
• Check PV Link Settings
• Measure Substring Voltage w/SnapRS
• Inspect PV Wiring
• SnapRS Health Check
• Verify DC Disconnect is ON.
• Check REbus Wiring Polarity.
• Check REbus Wiring Ground.
May need to:
• Inspect REbus Fuses.
• Verify DC Disconnect is ON
• Check PV Link Settings
• Check REbus Wiring
May need to:
• Inspect REbus Fuses
• Verify the SnapRS devices are installed correctly.
• Run the PVRSS self-test.
• SnapRS devices have not been installed or have failed.
Follow the instructions in the PVRSS Commissioning with
SnapRS Devices section. See
SnapRS Devices for PVRSS
Check the Mod. Settings menu and update the SnapRSInstalld
value to reflect the number of installed SnapRS devices.
If the failure occurs with normal exposure to sunlight, contact the
nearest Independent Authorized Service Dealer (IASD) or Gen-
erac Customer Service at 1–888–436–3722 (1–888–GENER-
www.generac.com
AC), or visit
for assistance.
(C000659)
Solution
Commissioning with
.
for assistance.
Troubleshooting
31