13
12
2
1
WARNING:
ALWAYS DISCONNECT AC POWER BEFORE DISCONNECTING PV MODULE WIRES
FROM THE BDM-500. THE AC CONNECTOR OF THE FIRST BDM-500 IN A BRANCH CIRCUIT IS
SUITABLE AS A DISCONNECTING MEANS ONCE THE AC BRANCH CIRCUIT BREAKER IN THE
LOADCENTER HAS BEEN OPENED.
LED indication of error
•
error mode (except for grounding error)
The LED light
fl
ashes in
red
color.
•
NOT
communicating with BDG
-
256, and with no error
The LED light
fl
ashes in
orange
color.
•
grounding fault
The LED light is in
solid red
color.
Troubleshooting an inoperable BDM
-
500
To troubleshoot an inoperable BDM-500, follow the steps in the order shown:
1. Check the connec
�
on to the u
�li
ty grid. Verify that the u
�li
ty voltage and
frequency are within allowable ranges shown in the label of BDM-500.
2. Verify u
�li
ty power is present at the inverter in ques
�
on by removing AC, then DC
power. Never disconnect the DC wires while the BDM-500 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-500.
Verify that each inverter is energized by the u
�l
ity 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-500.
6. Check the DC connec
�
ons between the BDM-500 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
inverters and the gateway. It may also be caused by the interference from other
electronic devices. In most cases, signal quality may be signi
fic
antly improved by
moving the BDG-256 to closer to the micro inverter arrays, and/or farther away
from other interferers. In some cases, a signal
fil
ter (LCF) may be installed to
reduce the interference to PLC communica
�
on. If there are two or more
separate BDM systems close by, it is highly recommended to install LCF for each
micro inverter system to block interference from adjacent other systems.
7. If the problem persists, please call customer support at NEP.
WARNING:
DO NOT ATTEMPT TO REPAIR THE BDM-500; IT CONTAINS NO
USER-SERVICEABLE PARTS. IF TROUBLESHOOTING METHODS FAIL, PLEASE RETURN THE
BDM-500 TO YOUR DISTRIBUTOR FOR MAINTENANCE.
Disconnecting a BDM
-
500
from the PV Module
To ensure the BDM-500 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-500.
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-500.
7. Remove the BDM-500 from the PV array racking.
Installing a replacement BDM
-
500
1. A
�
ach the replacement BDM-500 to the PV module racking using hardware
recommended by your module racking vendor in the same loca
�
on as the one
previously removed.
2. Connect the AC cable of the replacement BDM-500 and the neighboring
BDM-500s to complete the branch circuit connec
�
ons.
3. Obtain serial number of the replacement BDM-500
Each BDM-500 has a removable serial number located on the moun
�
ng
plate and addi
�
onal s
�c
kers in the shipping bag.
4. Reconnect the PV Modules.
First connect the posi
�
ve DC wire from the PV module to the nega
�
vely marked
DC connector (male pin) of the BDM-500. Then connect the nega
�
ve DC wire
from the PV module to theposi
�
vely marked DC connector (female socket) of the
BDM-500. Repeat for the remaining PV modules.
5. Replace the old PLC ID in the BDG-256 gateway with the new PLC ID of the
newly installed micro inverter.
