7. TROUBLESHOOTING AND MAINTENANCE
WARNING: DO NOT ATTEMPT TO REPAIR THE BDM-800; IT CONTAINS NO USER- SERVICEABLE PARTS. IF TROUBLESHOOTING
METHODS FAIL, PLEASE RETURN THE BDM-800/400 TO YOUR DISTRIBUTOR FOR MAINTENANCE.
WARNING: NEVER DISCONNECT THE DC WIRE CONNECTORS UNDER LOAD. ENSURE THAT NO CURRENT IS FLOWING IN THE DC WIRES
PRIOR TO DISCONNECTING. AN OPAQUE COVERING MAY BE USED TO COVER THE MODULE PRIOR TO DISCONNECTING
WARNING: ALWAYS DISCONNECT AC POWER BEFORE DISCONNECTING PV MODULE WIRES FROM BDM-800/400. THE AC CONNECTOR
OF THE FIRST BDM-800/400 IN A BRANCH CIRCUIT IS SUITABLE AS A DISCONNECTING MEANS ONCE THE AC BRANCH CIRCUIT
BREAKER IN THE LOAD CENTER HAS BEEN OPENED.
WARNING: BDM-800/400 IS POWERED BY DC POWER FROM PV MODULES. MAKE SURE YOU DISCONNECT THE DC CONNECTIONS AND
RECONNECT DC POWER TO WATCH FOR THE TWO SECONDS LED ON AND TWO SECONDS LED OFF AFTER DC IS APPLIED.
7.1 LED Indication of Error
7.1.C Error Mode (except for grounding error)
● The LED Light Flashes Red
7.1.B NOT communicating with BDG-256, and with no error
● The LED Light Flashed Orange
7.1.C Grounding Fault
● The LED Light is Solid Red
7.2 Troubleshooting An Inoperable BDM-800/400
To troubleshoot an inoperable BDM-800/400, follow the steps in the order shown:
● Check the connection to the utility grid and verify that the utility voltage and frequency are within
the allowable ranges shown on the BDM-800/400 label.
● Verify that utility power is present at the inverter in question by removing AC and DC power, then
reconnecting the DC module connectors and watching for LED blinks. Never disconnect the DC wires
while the BDM-800/400 is producing power.
● Check the AC branch circuit interconnection harness between all BDM-800/400s and verify that each
inverter is energized by the utility grid as described in the previous step.
● MEnsure that any AC disconnects are functioning properly and are closed.
● Verify that the PV module DC voltage is within the allowable range shown on the BDM-800/400
label.
● Check the DC connections between the BDM-800 and the PV module.
● The PLC signal quality may be checked through the interface on the BDG-256 gateway. If the PLC
signal is weak, it may be due to the distance between the microinverters and the gateway.
Modified 04/13/2023 by JMB
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