7. TROUBLESHOOTING AND MAINTENANCE
WARNING:
DO NOT ATTEMPT TO REPAIR THE BDM-300; IT CONTAINS NO USER-
SERVICEABLE PARTS. IF TROUBLESHOOTING METHODS FAIL, PLEASE RETURN THE BDM-300 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-300. THE AC CONNECTOR OF THE FIRST BDM-300 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-300 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.
LED indica
�o
n
o
f err
o
r
err
o
r m
o
de (except f
o
r gr
o
unding err
o
r)
The LED light
fl
ashes in
red
color.
NOT
c
o
mmunica
�
ng with BDG-256, and with n
o
err
o
r
The LED light
fl
ashes in
orange
color.
gr
o
unding fault
The LED light is in
solid red
color.
Tr
o
ublesh
oo�
ng an in
o
perable BDM-250
To troubleshoot an inoperable BDM-300, follow the steps in the order shown:
1. Check the connec
�
on to the u
�
lity grid. Verify that the u
�
lity voltage and
frequency are within allowable ranges shown in the label of BDM-300.
2. Verify u
�
lity power is present at the inverter in ques
�
on by removing AC, then DC
power. Never disconnect the DC wires while the BDM-300 is producing power. Re-
connect the DC module connectors, and then watch for the LED blinks.
3. Check the AC branch circuit interconnec
�
on harness between all the BDM-300.
Verify that each inverter is energized by the u
�
lity grid as described in the
previous step.
4. Make sure that any AC disconnects are func
�
oning properly and are closed.
5. Verify the PV module DC voltage is within the allowable range shown in the label
of BDM-300.
6. Check the DC connec
�
ons between the BDM-300 and the PV module.
7. PLC signal quality may be checked through the interface on the BDG-256 gateway.
If the PLC signal is weak, it might be due to the distance between the micro
Disc
o
nnec
�
ng a BDM-300 fr
o
m the PV M
o
dule
To ensure the BDM-300 is not disconnected from the PV modules under load, adhere
to the following disconnec
�
on steps in the order shown:
1. Disconnect the AC by opening the branch circuit breaker.
2. Disconnect the
fi
rst AC connector in the branch circuit.
3. Cover the module with an opaque cover.
4. Using a DC current probe, verify there is no current
fl
owing in the DC wires between
the PV module and the BDM-300.
5. Care should be taken when measuring DC currents, most clamp-on meters must be
zeroed
fi
rst and tend to dri
�
with
�
me.
6. Disconnect the PV module DC wire connectors from the BDM-300.
7. Remove the BDM-300 from the PV array racking.
Installing a replacement BDM-300
1. A
�
ach the replacement BDM-300 to the PV module racking using hardware
recommended by your module racking vendor
2. Connect the AC cable of the replacement BDM-300 and the neighboring BDM-300
to complete the branch circuit connec
�
ons.
3. Complete the connec
�
on map and connect the PV Modules.
1) Complete the connec
�
on map
2) Each BDM-300 has a removable serial number located on the moun
�
ng plate.
Enter this serial number into a BDG-256, and correspond it to a number in the
connec
�
on map.
3) Connect the PV Modules
4) Completely install all BDM-300 and all system inter-wiring connec
�
ons prior to
installing the PV modules.
a) Mount the PV modules above their corresponding BDM-300. Each BDM-
300 comes with two oppositely sexed DC connectors.
b) First connect the posi
�
ve DC wire from the PV module to the nega
�
vely
marked DC connector (male pin) of the BDM-300. Then connect the nega
�
ve
DC wire from the PV module to the posi
�
vely marked DC connector (female
socket) of the BDM-300. Repeat for all remaining PV modules using one BDM-
300 for each module.
4. Replace the old PLC_ID in the BDG-256 gateway with the new PLC_ID of
the replacement micro inverter.
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