Troubleshooting - Generac Power Systems PWRcell Reference Manual

Troubleshooting

The troubleshooting table below references the images and diagnostics contained in this section as well as relevant
materials in Appendix E
to resolve functionality call Generac PWRcell Technical Support 1-855-635-5186.
NOTE: Problems and diagnostics procedures are described in detail following the table.
Problem Observed Symptoms
Device Not Battery status LED not Illuminating with inverter
Powering On enabled and Battery Disconnect Switch 'On'.
No REbus Battery Battery device page does not appear on inverter
Comms screen
Battery Not Ready
Battery won't stay connected;
displays temporarily on PWRcell (battery) device
page on inverter screen upon enabling the battery.
Battery Not Battery not charging or discharging to expected
Charging/ limits
Discharging
Error
Battery in Error state;
displayed on inverter home page and
displayed on battery device page of inverter.
Cell Imbalance Cell Imbalance state displayed on battery device
page of inverter
Device Not Powering On
If, after enabling REbus from the inverter, the PWRcell
Battery cabinet status light is not illuminating, this likely
indicates that the BMU is not powering on from REbus.
1. Check that the inverter DC disconnect is on and
inverter REbus output voltage is present.
a. Use a digital multimeter (DMM) to measure the
DC voltage at the REbus power terminals (red
probe on RE+ and black probe on RE-). The
measured voltage should be between 360 V
and 420 V.
b. This should match the voltage displayed on the
inverter home screen.
2. Check REbus input voltage on battery terminal
block.
a. Use a DMM to measure the DC voltage at the
REbus power terminals (red probe on RE+ and
black probe on RE-). The measured voltage
should be between 360 V and 420 V.
Diagnostic Repair Manual
Battery. Use the diagnostic practices in the order they are listed to solve problems. If unable
Table 7-1. Battery Troubleshooting
'
Battery not ready
'
Error detected on PWRcell
Diagnostics
– Check DC disconnect at inverter
– Check Battery Disconnect Switch
– Check REbus DC Wiring
– Check REbus Communications
– Check Blackstart Battery
– Check REbus Communications
– Check DC disconnect at inverter
– Check REbus DC Wiring
– Check Battery Settings
– Verify PLM Channel matches Inverter
'
– Battery Disconnect Switch
– Battery Fuses
– Battery Power Wiring
– Battery Module Communications Wiring
– Battery Module Check
– Check Battery Settings
– Check System Mode
– Temperature Check
' – Battery disable/enable
' '
error state
– REbus Power Cycle
– Battery Module Check
– Battery Module Check
b. If REbus voltage is not at least 360 V:
(1) Confirm that the DC breaker in the inverter
is in the ON position.
(2) Confirm that the REbus fuses at the
inverter are not blown (use DMM to verify
resistance of fuse is less than 1 Ω).
(3) Check wiring from battery cabinet to
inverter.
c. If REbus voltage is correct:
(1) Verify device shows up on inverter screen.
– If device shows up and can be enabled
there is likely an issue with the indicator
light and/or its connector.
– Check REbus connector from battery ter-
minals (blue and red wires running
through blue ground current sensor) is
fully connected to BMU.
Section 7 PWRcell Battery
41