User Manual
7 Troubleshooting
35
Fault
Possible
cause
Method of correction
When data logger
device or monitor
software
is
working, the D1
LED is off; inquire
address and the
address
of
this
PVS is the same,
D8 is off
RS485
communication
fault
Check communication line.
Refer
to
settings
”.
D6
LED
on
monitor borad is
off
No 5V output on
switching power
supply board
Check voltage on monitoring unit +5V
plug, which shall be about 5V;
otherwise switching power supply
board is faulty and please contact us
for repair.
Faulty
CPU
board
Contact us for replacement of the
monitoring unit
On the monitoring
unit,
indicator
“SPD” lights up.
Failure of surge
protection device
Replace surge protection device in
time
Current
of
a
branch apparently
smaller or larger
than
current
of
other branches
Abnormal
current
Check size of PV strings of this
branch for consistency.
Check if this branch has shaded PV
string.
Display of open
circuit fault of a
branch
No
PV
string
connected to this
branch
Be
referencing
section
”,
set this
branch to unconnected status.
Dropped
out
cable or molten
fuse
Check PV cables for disconnection.
Or, replace fuse.
